Skip to main content

Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.

Mutations in Vps15 perturb neuronal migration in mice and are associated with neurodevelopmental disease in humans

A Publisher Correction to this article was published on 06 June 2018

This article has been updated

Abstract

The formation of the vertebrate brain requires the generation, migration, differentiation and survival of neurons. Genetic mutations that perturb these critical cellular events can result in malformations of the telencephalon, providing a molecular window into brain development. Here we report the identification of an N-ethyl-N-nitrosourea-induced mouse mutant characterized by a fractured hippocampal pyramidal cell layer, attributable to defects in neuronal migration. We show that this is caused by a hypomorphic mutation in Vps15 that perturbs endosomal–lysosomal trafficking and autophagy, resulting in an upregulation of Nischarin, which inhibits Pak1 signaling. The complete ablation of Vps15 results in the accumulation of autophagic substrates, the induction of apoptosis and severe cortical atrophy. Finally, we report that mutations in VPS15 are associated with cortical atrophy and epilepsy in humans. These data highlight the importance of the Vps15–Vps34 complex and the Nischarin–Pak1 signaling hub in the development of the telencephalon.

Access options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

Fig. 1: Vps15 is mutated in the Marble mouse.
Fig. 2: The Mbe/Mbe mutation compromises the function of the Vps15/Vps34 complex.
Fig. 3: Global quantitative proteomics reveals that Nischarin is upregulated in Mbe/Mbe mutants.
Fig. 4: Neuroanatomical characterization of the Mbe/Mbe hippocampus.
Fig. 5: Cortical architecture is preserved in Mbe/Mbe mutants, but acute depletion of Vps15 results in a neuronal migration defect.
Fig. 6: Severe cortical atrophy and caspase-induced apoptosis in Vps15-knockout animals.
Fig. 7: An L1224R mutation in VPS15 is associated with neurodevelopmental disease.

Change history

  • 06 June 2018

    In the supplementary information PDF originally posted, there were discrepancies from the integrated supplementary information that appeared in the HTML; the former has been corrected as follows. In the legend to Supplementary Fig. 2c, “major organs of the mouse” has been changed to “major organs of the adult mouse.” In the legend to Supplementary Fig. 6d,h, “At E14.5 Mbe/Mbe mutants have a smaller percentage of Brdu positive cells in bin 3” has been changed to “At E14.5 Mbe/Mbe mutants have a higher percentage of Brdu positive cells in bin 3.”

References

  1. 1.

    Ayala, R., Shu, T. & Tsai, L. H. Trekking across the brain: the journey of neuronal migration. Cell 128, 29–43 (2007).

    Article  PubMed  CAS  Google Scholar 

  2. 2.

    Noctor, S. C., Flint, A. C., Weissman, T. A., Dammerman, R. S. & Kriegstein, A. R. Neurons derived from radial glial cells establish radial units in neocortex. Nature 409, 714–720 (2001).

    Article  PubMed  CAS  Google Scholar 

  3. 3.

    Heng, J. I., Chariot, A. & Nguyen, L. Molecular layers underlying cytoskeletal remodelling during cortical development. Trends Neurosci. 33, 38–47 (2010).

    Article  PubMed  CAS  Google Scholar 

  4. 4.

    Gleeson, J. G. & Walsh, C. A. Neuronal migration disorders: from genetic diseases to developmental mechanisms. Trends Neurosci. 23, 352–359 (2000).

    Article  PubMed  CAS  Google Scholar 

  5. 5.

    D’Arcangelo, G. et al. A protein related to extracellular matrix proteins deleted in the mouse mutant reeler. Nature 374, 719–723 (1995).

    Article  PubMed  Google Scholar 

  6. 6.

    Sheldon, M. et al. Scrambler and yotari disrupt the disabled gene and produce a reeler-like phenotype in mice. Nature 389, 730–733 (1997).

    Article  PubMed  CAS  Google Scholar 

  7. 7.

    Keays, D. A. et al. Mutations in alpha-tubulin cause abnormal neuronal migration in mice and lissencephaly in humans. Cell 128, 45–57 (2007).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  8. 8.

    Chae, T. et al. Mice lacking p35, a neuronal specific activator of Cdk5, display cortical lamination defects, seizures, and adult lethality. Neuron 18, 29–42 (1997).

    Article  PubMed  CAS  Google Scholar 

  9. 9.

    Dhavan, R. & Tsai, L. H. A decade of CDK5. Nat. Rev. Mol. Cell Biol. 2, 749–759 (2001).

    Article  PubMed  CAS  Google Scholar 

  10. 10.

    Keays, D. A., Clark, T. G. & Flint, J. Estimating the number of coding mutations in genotypic- and phenotypic-driven N-ethyl-N-nitrosourea (ENU) screens. Mamm. Genome 17, 230–238 (2006).

    Article  PubMed  CAS  Google Scholar 

  11. 11.

    Corbo, J. C. et al. Doublecortin is required in mice for lamination of the hippocampus but not the neocortex. J. Neurosci. 22, 7548–7557 (2002).

    Article  PubMed  CAS  Google Scholar 

  12. 12.

    Hirotsune, S. et al. Graded reduction of Pafah1b1 (Lis1) activity results in neuronal migration defects and early embryonic lethality. Nat. Genet. 19, 333–339 (1998).

    Article  PubMed  CAS  Google Scholar 

  13. 13.

    Stack, J. H., Herman, P. K., Schu, P. V. & Emr, S. D. A membrane-associated complex containing the Vps15 protein kinase and the Vps34 PI 3-kinase is essential for protein sorting to the yeast lysosome-like vacuole. EMBO J. 12, 2195–2204 (1993).

    PubMed  PubMed Central  CAS  Article  Google Scholar 

  14. 14.

    Stein, M. P., Feng, Y., Cooper, K. L., Welford, A. M. & Wandinger-Ness, A. Human VPS34 and p150 are Rab7 interacting partners. Traffic 4, 754–771 (2003).

    Article  PubMed  CAS  Google Scholar 

  15. 15.

    Sun, Q., Westphal, W., Wong, K. N., Tan, I. & Zhong, Q. Rubicon controls endosome maturation as a Rab7 effector. Proc. Natl. Acad. Sci. USA 107, 19338–19343 (2010).

    Article  PubMed  PubMed Central  Google Scholar 

  16. 16.

    Ruas, M. et al. TPC1 has two variant isoforms, and their removal has different effects on endo-lysosomal functions compared to loss of TPC2. Mol. Cell Biol. 34, 3981–3992 (2014).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  17. 17.

    Tanida, I., Ueno, T. & Kominami, E. LC3 and autophagy. Methods Mol. Biol. 445, 77–88 (2008).

    Article  PubMed  CAS  Google Scholar 

  18. 18.

    Hara, T. et al. Suppression of basal autophagy in neural cells causes neurodegenerative disease in mice. Nature 441, 885–889 (2006).

    Article  PubMed  CAS  Google Scholar 

  19. 19.

    Schwämmle, V., León, I. R. & Jensen, O. N. Assessment and improvement of statistical tools for comparative proteomics analysis of sparse data sets with few experimental replicates. J. Proteome Res. 12, 3874–3883 (2013).

    Article  PubMed  CAS  Google Scholar 

  20. 20.

    Lim, K. P. & Hong, W. Human Nischarin/imidazoline receptor antisera-selected protein is targeted to the endosomes by a combined action of a PX domain and a coiled-coil region. J. Biol. Chem. 279, 54770–54782 (2004).

    Article  PubMed  CAS  Google Scholar 

  21. 21.

    Alahari, S. K., Reddig, P. J. & Juliano, R. L. The integrin-binding protein Nischarin regulates cell migration by inhibiting PAK. EMBO J. 23, 2777–2788 (2004).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  22. 22.

    Seress, L., Gulyás, A. I. & Freund, T. F. Pyramidal neurons are immunoreactive for calbindin D28k in the CA1 subfield of the human hippocampus. Neurosci. Lett. 138, 257–260 (1992).

    Article  PubMed  CAS  Google Scholar 

  23. 23.

    Nemazanyy, I. et al. Defects of Vps15 in skeletal muscles lead to autophagic vacuolar myopathy and lysosomal disease. EMBO Mol. Med. 5, 870–890 (2013).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  24. 24.

    Gorski, J. A. et al. Cortical excitatory neurons and glia, but not GABAergic neurons, are produced in the Emx1-expressing lineage. J. Neurosci. 22, 6309–6314 (2002).

    Article  PubMed  CAS  Google Scholar 

  25. 25.

    Goebbels, S. et al. Genetic targeting of principal neurons in neocortex and hippocampus of NEX-Cre mice. Genesis 44, 611–621 (2006).

    Article  PubMed  CAS  Google Scholar 

  26. 26.

    Akizu, N. et al. Biallelic mutations in SNX14 cause a syndromic form of cerebellar atrophy and lysosome-autophagosome dysfunction. Nat. Genet. 47, 528–534 (2015).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  27. 27.

    Sobreira, N., Schiettecatte, F., Valle, D. & Hamosh, A. GeneMatcher: a matching tool for connecting investigators with an interest in the same gene. Hum. Mutat. 36, 928–930 (2015).

    Article  PubMed  PubMed Central  Google Scholar 

  28. 28.

    Rostislavleva, K. et al. Structure and flexibility of the endosomal Vps34 complex reveals the basis of its function on membranes. Science 350, aac7365 (2015).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  29. 29.

    Vadlamudi, R. K. et al. p21-activated kinase 1 regulates microtubule dynamics by phosphorylating tubulin cofactor B. Mol. Cell Biol. 25, 3726–3736 (2005).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  30. 30.

    Arber, S. et al. Regulation of actin dynamics through phosphorylation of cofilin by LIM-kinase. Nature 393, 805–809 (1998).

    Article  PubMed  CAS  Google Scholar 

  31. 31.

    Ding, Y., Milosavljevic, T. & Alahari, S. K. Nischarin inhibits LIM kinase to regulate cofilin phosphorylation and cell invasion. Mol. Cell Biol. 28, 3742–3756 (2008).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  32. 32.

    Chai, X., Förster, E., Zhao, S., Bock, H. H. & Frotscher, M. Reelin stabilizes the actin cytoskeleton of neuronal processes by inducing n-cofilin phosphorylation at serine3. J. Neurosci. 29, 288–299 (2009).

    Article  PubMed  CAS  Google Scholar 

  33. 33.

    Schmid, R. S. et al. alpha3beta1 integrin modulates neuronal migration and placement during early stages of cerebral cortical development. Development 131, 6023–6031 (2004).

    Article  PubMed  CAS  Google Scholar 

  34. 34.

    Waugh, M. G. PIPs in neurological diseases. Biochim. Biophys. Acta. 1851, 1066–1082 (2015).

    Article  PubMed  CAS  Google Scholar 

  35. 35.

    Rivière, J. B. et al. De novo germline and postzygotic mutations in AKT3, PIK3R2 and PIK3CA cause a spectrum of related megalencephaly syndromes. Nat. Genet. 44, 934–940 (2012).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  36. 36.

    Mirzaa, G. M. et al. Characterisation of mutations of the phosphoinositide-3-kinase regulatory subunit, PIK3R2, in perisylvian polymicrogyria: a next-generation sequencing study. Lancet Neurol. 14, 1182–1195 (2015).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  37. 37.

    Stopkova, P. et al. Identification of PIK3C3 promoter variant associated with bipolar disorder and schizophrenia. Biol. Psychiatry 55, 981–988 (2004).

    Article  PubMed  CAS  Google Scholar 

  38. 38.

    Li, H. & Durbin, R. Fast and accurate short read alignment with Burrows-Wheeler transform. Bioinformatics. 25, 1754–1760 (2009).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  39. 39.

    Bejarano, E. et al. Connexins modulate autophagosome biogenesis. Nat. Cell Biol. 16, 401–414 (2014).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  40. 40.

    Dull, T. et al. A third-generation lentivirus vector with a conditional packaging system. J. Virol. 72, 8463–8471 (1998).

    PubMed  PubMed Central  CAS  Google Scholar 

  41. 41.

    Sun, T. et al. Acetylation of Beclin 1 inhibits autophagosome maturation and promotes tumour growth. Nat. Commun. 6, 7215 (2015).

    Article  PubMed  PubMed Central  Google Scholar 

  42. 42.

    Feng, W. et al. Dissection of autophagy in human platelets. Autophagy 10, 642–651 (2014).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  43. 43.

    Ma, Y. et al. Toll-like receptor (TLR) 2 and TLR4 differentially regulate doxorubicin induced cardiomyopathy in mice. PLoS ONE 7, e40763 (2012).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  44. 44.

    Lee, H. et al. Pathological roles of the VEGF/SphK pathway in Niemann-Pick type C neurons. Nat. Commun. 5, 5514 (2014).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  45. 45.

    Willy, J. A. et al. Function of inhibitor of Bruton’s tyrosine kinase isoform α (IBTKα) in nonalcoholic steatohepatitis links autophagy and the unfolded protein response. J. Biol. Chem. 292, 14050–14065 (2017).

    Article  PubMed  CAS  PubMed Central  Google Scholar 

  46. 46.

    Jana, N. R., Tanaka, M., Wang, Gh & Nukina, N. Polyglutamine length-dependent interaction of Hsp40 and Hsp70 family chaperones with truncated N-terminal huntingtin: their role in suppression of aggregation and cellular toxicity. Hum. Mol. Genet. 9, 2009–2018 (2000).

    Article  PubMed  CAS  Google Scholar 

  47. 47.

    Santoh, M. et al. Acetaminophen induces accumulation of functional rat CYP3A via polyubiquitination dysfunction. Sci. Rep. 6, 21373 (2016).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  48. 48.

    Rinaldi, C. et al. Insulinlike growth factor (IGF)-1 administration ameliorates disease manifestations in a mouse model of spinal and bulbar muscular atrophy. Mol. Med. 18, 1261–1268 (2012).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  49. 49.

    Walls, K. C. et al. Lysosome dysfunction triggers Atg7-dependent neural apoptosis. J. Biol. Chem. 285, 10497–10507 (2010).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  50. 50.

    Bertrand, T. et al. Conformations of tissue plasminogen activator (tPA) orchestrate neuronal survival by a crosstalk between EGFR and NMDAR. Cell Death Dis. 6, e1924 (2015).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  51. 51.

    Li, S., Leshchyns’ka, I., Chernyshova, Y., Schachner, M. & Sytnyk, V. The neural cell adhesion molecule (NCAM) associates with and signals through p21-activated kinase 1 (Pak1). J. Neurosci. 33, 790–803 (2013).

    Article  PubMed  CAS  Google Scholar 

  52. 52.

    Breuss, M. et al. Mutations in the β-tubulin gene TUBB5 cause microcephaly with structural brain abnormalities. Cell Rep. 2, 1554–1562 (2012).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  53. 53.

    Vandesompele, J. et al. Accurate normalization of real-time quantitative RT-PCR data by geometric averaging of multiple internal control genes. Genome Biol. 3, H0034 (2002).

    Article  Google Scholar 

  54. 54.

    Boda, E., Pini, A., Hoxha, E., Parolisi, R. & Tempia, F. Selection of reference genes for quantitative real-time RT-PCR studies in mouse brain. J. Mol. Neurosci. 37, 238–253 (2009).

    Article  PubMed  CAS  Google Scholar 

  55. 55.

    Pichler, P. et al. Peptide labeling with isobaric tags yields higher identification rates using iTRAQ 4-plex compared to TMT 6-plex and iTRAQ 8-plex on LTQ Orbitrap. Anal. Chem. 82, 6549–6558 (2010).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  56. 56.

    Kita, Y., Kawakami, K., Takahashi, Y. & Murakami, F. Development of cerebellar neurons and glias revealed by in utero electroporation: Golgi-like labeling of cerebellar neurons and glias. PLoS ONE 8, e70091 (2013).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  57. 57.

    Chu, Y. Y. et al. Astrocytic CCAAT/enhancer binding protein delta regulates neuronal viability and spatial learning ability via miR-135a. Mol. Neurobiol. 53, 4173–4188 (2016).

    Article  PubMed  CAS  Google Scholar 

  58. 58.

    Navarro-Quiroga, I., Hernandez-Valdes, M., Lin, S. L. & Naegele, J. R. Postnatal cellular contributions of the hippocampus subventricular zone to the dentate gyrus, corpus callosum, fimbria, and cerebral cortex. J. Comp. Neurol. 497, 833–845 (2006).

    Article  PubMed  Google Scholar 

  59. 59.

    Vasistha, N. A. et al. Cortical and clonal contribution of Tbr2 expressing progenitors in the developing mouse brain. Cereb. Cortex 25, 3290–3302 (2015).

    Article  PubMed  Google Scholar 

  60. 60.

    Boekhoorn, K. et al. Doublecortin (DCX) and doublecortin-like (DCL) are differentially expressed in the early but not late stages of murine neocortical development. J. Comp. Neurol. 507, 1639–1652 (2008).

    Article  PubMed  CAS  Google Scholar 

  61. 61.

    Hendzel, M. J. et al. Mitosis-specific phosphorylation of histone H3 initiates primarily within pericentromeric heterochromatin during G2 and spreads in an ordered fashion coincident with mitotic chromosome condensation. Chromosoma 106, 348–360 (1997).

    Article  PubMed  CAS  Google Scholar 

  62. 62.

    Shah, B. et al. C3G/Rapgef1 is required in multipolar neurons for the transition to a bipolar morphology during cortical development. PLoS ONE 11, e0154174 (2016).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  63. 63.

    Mullen, R. J., Buck, C. R. & Smith, A. M. NeuN, a neuronal specific nuclear protein in vertebrates. Development 116, 201–211 (1992).

    PubMed  CAS  Google Scholar 

  64. 64.

    Nóbrega, C. et al. Silencing mutant ataxin-3 rescues motor deficits and neuropathology in Machado-Joseph disease transgenic mice. PLoS ONE 8, e52396 (2013).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  65. 65.

    Keays, D. A. et al. The role of Tuba1a in adult hippocampal neurogenesis and the formation of the dentate gyrus. Dev. Neurosci. 32, 268–277 (2010).

    Article  PubMed  CAS  Google Scholar 

  66. 66.

    Castellano, B. et al. A double staining technique for simultaneous demonstration of astrocytes and microglia in brain sections and astroglial cell cultures. J. Histochem. Cytochem. 39, 561–568 (1991).

    Article  PubMed  CAS  Google Scholar 

  67. 67.

    Gonchar, Y., Wang, Q. & Burkhalter, A. Multiple distinct subtypes of GABAergic neurons in mouse visual cortex identified by triple immunostaining. Front. Neuroanat. 1, 3 (2008).

    Article  PubMed  PubMed Central  Google Scholar 

  68. 68.

    Gandal, M. J. et al. GABAB-mediated rescue of altered excitatory-inhibitory balance, gamma synchrony and behavioral deficits following constitutive NMDAR-hypofunction. Transl. Psychiatry 2, e142 (2012).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  69. 69.

    Pillai, A. G. et al. Dendritic morphology of hippocampal and amygdalar neurons in adolescent mice is resilient to genetic differences in stress reactivity. PLoS ONE 7, e38971 (2012).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  70. 70.

    Bas-Orth, C., Tan, Y. W., Oliveira, A. M., Bengtson, C. P. & Bading, H. The calmodulin-binding transcription activator CAMTA1 is required for long-term memory formation in mice. Learn. Mem. 23, 313–321 (2016).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  71. 71.

    Oliver, P. L., Keays, D. A. & Davies, K. E. Behavioural characterisation of the robotic mouse mutant. Behav. Brain Res. 181, 239–247 (2007).

    Article  PubMed  Google Scholar 

  72. 72.

    Deacon, R. M. & Rawlins, J. N. T-maze alternation in the rodent. Nat. Protoc. 1, 7–12 (2006).

    Article  PubMed  Google Scholar 

  73. 73.

    Marco-Sola, S., Sammeth, M., Guigó, R. & Ribeca, P. The GEM mapper: fast, accurate and versatile alignment by filtration. Nat. Methods 9, 1185–1188 (2012).

    Article  PubMed  CAS  Google Scholar 

  74. 74.

    Derrien, T. et al. Fast computation and applications of genome mappability. PLoS ONE 7, e30377 (2012).

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  75. 75.

    Cingolani, P. et al. A program for annotating and predicting the effects of single nucleotide polymorphisms, SnpEff: SNPs in the genome of Drosophila melanogaster strain w1118; iso-2; iso-3. Fly 6, 80–92 (2012).

    Article  CAS  Google Scholar 

Download references

Acknowledgements

We thank the family for the donation of the genetic and biological material. We also acknowledge the input of P. Potter and S. Wells from the mutagenesis program at MRC Harwell and the MRC funding that underpinned it (MC U142684172). We are indebted to R. Williams for modeling the VPS15 human mutation. We also thank the transgenic, bio-optics, proteomic and graphics services groups at the IMP/IMBA. We thank The National Center for Medical Genomics (LM2015091) for providing allelic frequencies in ethnically matched populations (project CZ.02.1.01/0.0/0.0/16_013/0001634). We thank Boehringer Ingelheim and the FWF for funding this research (D.A.K., I914, P24267). The human studies were funded by the European Community’s 7th Framework Program (FP7/2007-2013). S.K., A.P. and V.S. were supported by institutional programs of Charles University in Prague (UNCE 204011, PROGRES-Q26/LF1 and SVV 260367/2017). We acknowledge grants 15-28208A and RVO-VFN 64165 from the Ministry of Health of the Czech Republic and the project LQ1604 NPU II from the Ministry of Education.

Author information

Affiliations

Authors

Contributions

A.E., J.F. and D.A.K. performed the phenotypic screen and genetic mapping. T.M.K. and D.J.A. did the whole-exome sequencing on the Marble mouse. T.G., G.R. and T.Hochstoeger analyzed the expression of Vps15. T.G., I.L., M.B., S.P.-C., A.H.H., R.T. and L.L. were responsible for the characterization of the Marble and KO mouse lines. K.M. and G.D. undertook the mass spectroscopy experiments. M.R. and T.G. performed the in utero electroporation analysis. A.P., T.Honzik, M.G., S.B., E.S., S.K., V.S. and I.G. collated the clinical data and performed whole-exome sequencing and analysis of the L1224R patient. T.G. performed the functional experiments. A.K.T., T.G. and J.Z. designed and performed the lentiviral rescue experiment. T.G. and D.A.K. wrote the manuscript and all authors commented on it.

Corresponding author

Correspondence to David A. Keays.

Ethics declarations

Competing interests

The authors declare no competing financial interests.

Additional information

Publisher’s note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations

Integrated Supplementary Information

Supplementary Figure 1 Genetic mapping of the Marble mutation

a Schematic showing the parameters assessed for the ENU screen. Nissl stained stereotaxically matched sections through the telencephalon (Bregma −2.06 mm) were analyzed. The following measurements were taken: thickness of the cortex; volume of the corpus callosum; thickness of the stratum oriens of the hippocampus; length of the pyramidal cell layer of the hippocampus; thickness of the radial and molecular layer of the hippocampus; length of the dentate gyrus; and volume of the third ventricle and lateral ventricles. b Schematic showing the results for the genetic mapping experiments. The marker and its position along chromosome 9 are shown on the left, and the number of animals with that particular genotype are shown at the bottom. Filled black boxes indicate homozygosity for the ENU mutagenized C57/BL6 allele, whereas clear boxes indicate the presence of at least one C3H/HeH allele. The causative mutation was mapped to a 28.6 Mb interval between D9mit11 and D9mit81. c Sequencing traces of Vps15 cDNA for +/+, +/Mbe, Mbe/Mbe. mRNA was extracted from the developing forebrain of animals at E14.5, and cDNA generated by reverse transcription. In Mbe/Mbe animals the insertion of a stop codon (TAG) can be seen. d-m Representative Nissl stains of brains of adult +/+ and +/+/BAC mice (n = 3 animals per genotype). No structural brain abnormalities were observed in +/+/BAC transgenic mice harboring additional copies of Vps15 i-m in comparison to littermate wild-type controls d-h. Boxed areas in d and i highlight the cortex (magnified in e and j) and the CA1 region of the hippocampus (magnified in f and k). g and l show the cerebellum. Boxed areas are magnified in h and m. The scale bars in i show 1000 μm, 200 μm in j, 100 μm in k and m and 500 μm in l.

Supplementary Figure 2 Expression of Vps15 and functional analysis of the Marble mutation

a-c qPCR results showing the expression of Vps15 in: a the developing mouse brain from E10.5 to P6; b in the adult mouse brain; and c in the major organs of the adult mouse. Vps15 was expressed in all tissues analyzed (n = 2-3 technical replicates on a pooled sample of 3 biological samples). d Western blot analysis of Vps15, Vps34 and Beclin1 levels in MEFs taken from +/+ and Mbe/Mbe animals. Cropped images are shown. Gapdh was employed as a loading control. e Relative quantitation of the protein levels shown in d reveals a significant reduction in Vps15 (n = 3 animal per genotype; one-tailed unpaired t-test, t4 = 9.467; P = 0.0003), Vps34 (n = 3 animals per genotype; one-tailed unpaired t-test, t4 = 8.44; P = 0.0005), and Beclin1 in Mbe/Mbe mutants (n = 3 animals per genotype; one-tailed unpaired t-test, t4 = 7.877; P = 0.0007). f qPCR results for transcript levels of Vps15, Vps34 and Beclin1 from E14.5 brains. While the transcript levels of Vps15 are lower, there are no significant differences between genotypes (n = 3 animals per genotype; one-way ANOVA with a Tukey’s multiple comparison; +/+ vs Mbe/Mbe: Vps15: P = 0.1911; Vps34: P = 0.7545; Beclin1: P = 0.6128) g-h Western blot analysis of Vps15 employing a N-terminal antibody in MEFs and Neuro2A (N2A) cells. Cropped images are shown. N2A cells were transfected with a shortened version of Vps15 (1-289) reflecting the predicted length of the Mbe/Mbe truncated protein. g The N-terminal Vps15 antibody detected full-length Vps15 at physiological levels in +/+ MEFs and N2A cells (highlighted with black arrow head). A C-terminal Vps15 antibody confirmed that the band is Vps15. h The N-terminal Vps15 antibody binds Vps15(1-289) with high affinity but does not detect a band at the corresponding size in either +/+ or Mbe/Mbe MEFs. These data indicate that the Marble mutation does not lead to the expression of a truncated protein, most likely due to nonsense mediated decay of the transcript. i Levels of PDGFR receptor β after stimulation with receptor ligand PDGF-BB in +/+ (blue line) and Mbe/Mbe (red line) MEFs (n = 3). j PDGF receptor half-life was calculated from fitted data in i. Mbe/Mbe cells show significantly slower receptor degradation (n = 3 animals per genotype, one-tailed unpaired t-test, t4 = 2.633; P = 0.029). k Representative FACs plot of MEFs stained with lysotracker for +/+ and Mbe/Mbe animals. The Y axis shows the cell count and the intensity of staining is shown on the X axis. l Quantitation of lysotracker results reveals no significant difference between +/+ and Mbe/Mbe animals (n = 3 animals per genotype; unpaired t-test, t4 = 1.022; P = 0.3645). Error bars show mean +/- standard error of the mean.

Supplementary Figure 3 Expression analysis of Nischarin

a-b qPCR results showing the expression of Nischarin in a the developing mouse brain from E12.5 to P6 and b in the major organs of the adult mouse (n = 3 animals per genotype). Nischarin was expressed in all tissues analyzed, with highest expression levels in the developing brain (E12.5 to E16.5). c-f Representative images of P11 mouse brains stained with sera against Nischarin. Boxed areas in c and d are magnified in e and f. Pyramidal neurons located in the oriens layer (OL) were notable for the strong Nischarin staining (black arrow heads). g Quantification revealed significantly higher Nischarin staining for cells found in the oriens layer (OL) as compared to those located in the pyramidal cell layer (PL) (n = 3 animals per genotype; one-tailed unpaired t-test; t4 = 2.212; P = 0.0457). The scale bar shows 500 μm in c and 100 μm in e. Error bars show mean +/- standard error of the mean.

Supplementary Figure 4 Analysis of hippocampal neurons in Mbe/Mbe mutants

(a-m) Representative images of brains from 8-week old mice stained with sera against calretinin (a-f) and parvalbumin (h-m). Quantification showing the percentage of calretinin positive (g) or parvalbumin positive (n) interneurons in the oriens layer (OL). There was no significant difference when comparing Mbe/Mbe animals and littermate controls (+/+, +/Mbe) (n = 3 animals per genotype; calretinin: one-way ANOVA with a Tukey’s multiple comparisons test; +/+ vs Mbe/Mbe; P = 0.8137; parvalbumin: Kruskal-Wallis test with a Dunn’s multiple comparison test; +/+ vs Mbe/Mbe; P>0.9999). (o) Image of a Golgi stained pyramidal neuron from the hippocampus. Spines located on tertiary apical dendritic branches distanced more than 120μm from the soma (red line) were quantitated. (p) Quantification of spine density in +/+ and Mbe/Mbe animals reveals no significant differences between genotypes (n = 4-6 neurons per animal; n = 3 animals per genotype; two-tailed unpaired t-test; t4 = 0.3386; P = 0.7519). (q) Schematic representation of CA1 pyramidal neurons that were traced in three dimensions and assessed by Scholl analysis. (r) Quantitation of dendritic intersections from the soma. Ectopic Mbe/Mbe neurons exhibit a significant decrease in complexity, that is most evident 100 μm to 160 μm from the soma (n = 3 cells per animal, n = 3 animals per genotype; two-way ANOVA with a Tukey’s multiple comparisons test; interaction P<0.0001, Supplementary Table 1). The scale bars in (c), and (j) show 500 μm, 100 μm in (f) and (m) and 50 μm in (o). Error bars show mean +/- standard error of the mean.

Supplementary Figure 5 The Marble mouse does not show obvious defects in the dentate gyrus nor deficits in locomotion or anxiety

a-x Representative images of histological stainings on the dentate gyrus of adult +/+, +Mbe, and Mbe/Mbe animals with sera against Prox1 (which labels mature granule cells), GFAP (which labels radial glial-like progenitors), Dcx (which labels newly born neurons), and Tbr2 (which labels intermediate progenitors). These experiments revealed that the granule cell layer and the subgranular zone is similarly organized in all genotypes (n = 3 animals per genotype). y Total distance travelled in the open field reveals no locomotor phenotype in Mbe/Mbe animals (n = 17 animals per genotype; one-way ANOVA with a Tukey’s multiple comparisons test, Bonferroni corrected; +/+ vs Mbe/Mbe; P>0.9999). z Number of entries into the center of the open field. There is no significant difference between genotypes indicating anxiety phenotypes are normal in Mbe/Mbe animals (n = 17 animals per genotype; one-way ANOVA with a Tukey’s multiple comparisons test, Bonferroni corrected; +/+ vs Mbe/Mbe; P = 0.7546). The scale bars show 500 μm in a and 100 μm b. Error bars show mean +/- standard error of the mean.

Supplementary Figure 6 Anatomical characterization of the Marble cortex and cerebellum

a-g Representative images of birth date labeling studies following the injection of BrdU in pregnant dams at E12.5 a-c and E14.5 e-g followed by histological analysis at P0. Cortical sections were divided into ten equal bins, cells counted blind to genotype, and then the relative number of BrdU positive cells calculated for each bin. Bin 10 represents the deepest bin, with bin 1 being closest to the cortical surface. d, h Statistical analysis revealed a significant difference when comparing +/Mbe heterozygotes with Mbe/Mbe mutants at E12.5 in bin 7 (n = 5 animals per genotype; two-way repeated measures ANOVA with Tukey’s multiple correction test; +/Mbe vs Mbe/Mbe P = 0.0242) and at E14.5 in bin 3 (n = 3 animals per genotype; two-way repeated measures ANOVA with Tukey’s multiple correction test; +/Mbe vs Mbe/Mbe P = 0.0465). At E14.5 Mbe/Mbe mutants have a higher percentage of Brdu positive cells in bin 3 indicative of a mild defect in neuronal migration. Unexpectedly, at E12.5 fewer cells are in bin 7, suggesting mildly faster migration. i-q Analysis of the cerebellum in +/+, +/Mbe, and Mbe/Mbe animals. Panels i-k show representative images of Nissl staining, l-n Foxp2 staining, and o-q Calbindin staining. The molecular layer, Purkinje cell layer, and granule cell layer all appear intact in Mbe/Mbe mutants (n = 3 animals per genotype). Error bars show mean +/- standard error of the mean. The scale bars in c and g show 200 μm and 150 μm in q.

Supplementary Figure 7 Control experiments for in utero electroporation studies

a Western blot analysis of Nischarin in Neuro2A cells transfected with a shmiRNAs targeting Nischarin (shmiNISCH) or a scrambled negative control (shmiNEG). Cropped images are shown. b Quantification revealed a 60% reduction in Nischarin protein levels following transfection with a shmiNISCH (n = 3 flasks, one-tailed Mann Whitney test; P = 0.05). c-h Representative images for in utero electroporation experiments. Constructs were electroporated at E14.5 before analysis at E17.5. GFP positive cells were quantified in 3 blinded sections per animal in 9 areas across the developing cortex and expressed relative to the total number of cells. e, h Electroporation of a knock-down construct targeting Nischarin c-e or of a phosphomimetic mutant of Pak1(T422E) f-h in wild-type animals did not significantly influence neuronal migration (two-way repeated measures ANOVA with a Bonferroni multiple comparison test; shmiNISCH: n = 4 animals per condition, interaction P = 0.7074; Pak1(T422E): n = 5 animals per condition, interaction P = 0.3652). i-n Representative images of mouse brains electroporated with either Nischarin or pCAGEN control vector followed by immunostaining with sera targeting Nischarin (n = 3 animals per genotype). i-k Cells with highest levels of Nischarin congregated in the subventricular and intermediate zones. l-n No immunoreactivity for Nischarin was found in mouse brains electroporated with the control vector when employing those imaging conditions used in i-k. Note that these imaging conditions do not allow detection of the endogenous protein. Error bars show mean +/- standard error of the mean. The scale bar shows 100 μm in c, f, i and l.

Supplementary Figure 8 Neuroanatomical characterization of Vps15 fl/fl Emx1-Cre animals at E14.5.

a-c Representative coronal Nissl stains of the developing E14.5 cortex of +/fl, +/fl Emx1-Cre, and fl/fl Emx1-Cre animals. d Quantitation of cortical thickness. fl/fl Emx1-Cre animals have a thinner cortex, but this is not significantly different from +/fl animals (n = 3 animals per genotype; Kruskal-Wallis test with a Dunn’s correction for multiple testing, Bonferroni corrected; +/fl vs fl/fl Emx1-Cre; P = 0.0714). Analogous to our P0 and P11 results (Figure 6) we did not observe a phenotype in +/fl Emx1-Cre heterozygotes. These animals were employed as controls for subsequent stainings. e-f Caspase staining of the cortex at E14.5 of +/fl Emx1-Cre and fl/fl Emx1-Cre animals. Caspase positive cells can be observed in both proliferative and postmitotic regions in fl/fl Emx1-Cre animals. g Quantification of the number of caspase positive cells reveals a significant difference between genotypes (n = 3 animals per genotype; unpaired t-test; one-tailed with a Bonferroni correction; t4 = 8.779; P = 0.0035). h-i Staining with the progenitor marker Sox2 at E14.5 of +/fl EMX1-Cre and fl/fl Emx1-Cre animals. j Quantitation of the thickness of the Sox2 positive layer shows that it is thinner in fl/fl Emx1-Cre animals, but this difference is not statistically significant (n = 3 animals per genotype; unpaired t-test; one-tailed with a Bonferroni correction; t4 = 3.455; P = 0.091). k-l Staining with the intermediate progenitor marker Tbr2 at E14.5. m Quantitation of the thickness of the Tbr2 positive layer, shows that it is thinner in fl/fl Emx1-Cre animals, but this difference is not statistically significant (n = 3 animals per genotype; unpaired t-test; one-tailed with a Bonferroni correction; t4 = 2.867; P = 0.1596). n-o Staining with the early neuronal marker DCX at E14.5. p Quantitation of the thickness of the DCX positive layer shows that it is thinner in fl/fl Emx1-Cre animals but this difference is not statistically significant (n = 3 animals per genotype; unpaired t-test; one-tailed with a Bonferroni correction; t4 = 3.217; P = 0.1134). q-r Staining with the M-phase marker pH3 at E14.5. (s) Quantitation of the number of ventricular and abventricular pH3 positive cells reveals a reduction fl/fl Emx1-Cre animals, but this difference is not statistically significant (n = 3 animals per genotype; two-tailed unpaired t-test; with a Bonferroni correction; abventricular: t4 = 2.299; P = 0.581; ventricular; t4 = 0.4494; P>0.9999). (t-u) Staining with the radial glial marker Nestin at E14.5. Distinct radial glial fibers can be observed in control animals (+/fl Emx1-Cre), in contrast to fl/fl Emx1-Cre animals where fibers form thick bundles in the developing cortical plate (shown with an arrow). Images in (a-u) are representative. Scale bars in c and f show 50 μm. Error bars show mean +/- standard error of the mean.

Supplementary Figure 9 Analysis of human dermal fibroblasts obtained from a patient with a L1224R mutation in VPS15

a Sequencing traces of the A to C variant in VPS15 that encodes for a L1224R missense mutation in the homozygous proband. b Homology comparison of the L1224 residue in mice, xenopus, zebrafish, and drosophila reveals it is highly conserved. c Quantitation of relative mRNA expression of VPS15, VPS34 and BECLIN1 in dermal fibroblasts from the father, mother and proband. No significant differences were observed on the levels of VPS15 transcript (n = 3 flasks per individual; one-way ANOVA with a Tukey’s multiple comparison; father vs proband: P = 0.8928; mother vs proband: P = 0.9998), on the levels of VPS34 transcript (n = 3 flasks per individual; one-way ANOVA with a Tukey’s multiple comparison; father vs proband: P = 0.9429; mother vs proband: P = 0.2655) or on the levels of BECLIN1 transcript (n = 3 individual flasks; one-way ANOVA with a Tukey’s multiple comparison; father vs proband: P = 0.8377; mother vs proband: P = 0.1506). See Supplementary Table 1. These data indicate the that the reduction in VPS15 protein levels is due to post-transcriptional dysregulation. d Western blot analysis of LC3-I, and LC3-II on protein lysates prepared from patient and parent HDFs before and after lysosomal inhibition with Bafilomycin A1 (n = 3 flasks per individual). Cropped images are shown. Quantification e-g reveals a reduction in the ratio of LC3-II/LC3-I at 0hrs, but this is not statistically significant (one-way ANOVA with a Tukey’s multiple comparison, Bonferroni corrected; father vs proband: P>0.9999, mother vs proband: P>0.9999). Similarly when assessing autophagy flux (2hr-0hr) and formation at (4hr-2h) we observe a reduction in L1224R fibroblasts, however, this is not significant (one-way ANOVA with a Tukey’s multiple comparison, Bonferroni corrected; 2hr-0hr: father vs proband: P>0.9999, mother vs proband: P>0.9999; 4hr-2hr: father vs proband: P = 0.1836, mother vs proband: P = 0.1482). h Representative FACs plot for lysotracker experiments conducted on HDFs from the mother (shown in dark blue), father (shown in light blue), and proband (shown in red). The Y axis shows the cell count and the intensity of staining is shown on the X axis. i Quantification of the median intensity of lysotracker staining shows a mild but significant reduction in the proband in comparison to the father (n = 3 flasks per individual, one-way ANOVA with Tukey’s multiple comparison, father vs. proband P = 0.0466). Error bars indicate mean +/- standard error of the mean.

Supplementary Figure 10 Model showing the effect of Vps15 mutations on neuronal migration and cell survival

Under wild-type conditions Vps15 acts in a complex with Vps34 and Beclin1 catalyzing the formation of the phospholipid PI(3)P at endosomes and autophagosomes. The splice site mutation in the Marble mouse is a hypomorph, reducing the levels of the Vps15/Vps34 complex which impairs endosome (E) to lysosome (L) trafficking. As a consequence, Nischarin, a protein that binds PI(3)P and is localized to the endosome, is upregulated in Marble mutants. Nischarin inhibits Pak1 phosphorylation, which is known to influence microtubule dynamics through the phosphorylation of tubulin cofactor B and the actin cytoskeleton by activating LIM kinase. We propose that perturbation of this pathway causes the neuronal migration defect in Marble animals. If Vps15 is deleted in neurons, autophagy progression is blocked leading to the accumulation of p62 positive substrates. This in turn is associated with caspase induced cell death and severe cortical atrophy.

Supplementary Figure 11 Full scans of all western blots presented in this manuscript

In some instances western blot membranes were cut allowing incubation with different antibodies. Shown are the full scans of each membrane fragment.

Supplementary information

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Gstrein, T., Edwards, A., Přistoupilová, A. et al. Mutations in Vps15 perturb neuronal migration in mice and are associated with neurodevelopmental disease in humans. Nat Neurosci 21, 207–217 (2018). https://doi.org/10.1038/s41593-017-0053-5

Download citation

Further reading

Search

Quick links

Nature Briefing

Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily.

Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing