Structural birth defects in the kidney and urinary tract are observed in 0.5% of live births and are a major cause of end-stage renal disease, but their genetic aetiology is not well understood. Here we analyse 135 lines of mice identified in large-scale mouse mutagenesis screen and show that 29% of mutations causing congenital heart disease (CHD) also cause renal anomalies. The renal anomalies included duplex and multiplex kidneys, renal agenesis, hydronephrosis and cystic kidney disease. To assess the clinical relevance of these findings, we examined patients with CHD and observed a 30% co-occurrence of renal anomalies of a similar spectrum. Together, these findings demonstrate a common shared genetic aetiology for CHD and renal anomalies, indicating that CHD patients are at increased risk for complications from renal anomalies. This collection of mutant mouse models provides a resource for further studies to elucidate the developmental link between renal anomalies and CHD.
Developmental abnormalities of the kidney account for 20–30% of all structural birth defects and are a significant cause of end-stage renal disease1,2,3. Development of the metanephric or adult kidney in mammals starts with the formation of the ureteric bud from the mesonephric duct. Development is driven by reciprocal interactions between the epithelium of the mesonephric duct and the metanephric mesenchyme that overlies the nephric duct. These interactions induce the ureteric bud to grow out, branch and differentiate into the collecting ducts, the renal calyces, pelvis and ureter. The metanephric mesenchyme is reciprocally induced to undergo a mesenchyme-to-epithelial transition to form the nephrons.
Defects in the induction and patterning of the developing kidney can lead to a variety of renal-related birth defects that collectively are known as congenital abnormalities of the kidney and urinary tract (CAKUT). These can include renal/urinary tract-specific abnormalities, kidney agenesis (absent kidney), hypoplasia (small kidney) or dysplasia (immature or malformed structures in the kidney), cystic dysplastic kidneys (malformed kidneys with cysts), horseshoe kidney (both kidneys fused together), hydronephrosis (dilation of the renal pelvis), hydroureter (dilation of the ureter), duplex kidneys (duplicate collecting duct systems with one branched or two unbranched ureters), as well as obstructions at the ureter–bladder junction or ureter–kidney pelvis junction. Renal defects can also be observed as part of syndromes such as in VACTERL association, where they are seen in combination with vertebral defects, anal atresia, cardiac defects, trachea–oesophageal fistula and limb abnormalities4. In renal coloboma syndrome, defects in formation of the eye and kidney are observed, whereas Fraser syndrome affects formation of the kidney and genitalia. In addition, ciliopathies often present with cystic kidney disease in combination with other organ defects.
The genetics of the major forms of cystic kidney disease are well established with two genes (PKD1 and PKD2) identified to cause autosomal dominant form of polycystic kidney disease (PKD) and a single gene (PKHD1) causing the recessive form of PKD. In addition, many genes causing renal ciliopathies have been identified. These typically encode components of the cilium or the machinery used to assemble cilia. However, the genetics for the majority of CAKUT cases remain largely unknown. The CAKUT genes that have been identified are typically involved in the early steps of patterning and development of the kidney. Recovery of CAKUT genes has been confounded by incomplete penetrance and the probable involvement of more complex genetics. Other than Pax2, which causes renal coloboma syndrome, and Hnf1b, which causes renal cystic disease and diabetes, most genes identified to cause CAKUT are associated with disease in only a few patients and the evidence supporting pathogenesis is weak2. In the present study, we examined renal anomalies in mutants recovered from a large-scale mouse mutagenesis screen. These mutants were identified to have congenital heart disease (CHD) and were recovered based on cardiovascular phenotyping using non-invasive fetal ultrasound imaging5. This allowed recovery of mutants that otherwise would be lost due to prenatal/neonatal lethality. Interestingly, many of the CHD mutants recovered also exhibited renal abnormalities. The recovery of pathogenic mutations in these mutants identified an enrichment of cilia-related genes, suggesting ciliary dysfunction may play a significant role in congenital defects of both the heart and kidney.
Forward genetic screen identifies diverse kidney anomalies
We conducted a large-scale forward genetic screen with ethylnitrosourea mutagenesis, to interrogate the genetic aetiology of CHD5. With the screening of more than 80,000 fetuses using in utero ultrasound imaging, >200 mutant lines with a wide spectrum of CHD were recovered. The causative mutations were identified in 135 lines by whole exome sequencing and genotyping. As part of this study, we also characterized the non-cardiac anomalies in the CHD mutants and found an unexpected high prevalence of renal abnormalities in the CHD mutants. Among 135 lines in which the pathogenic mutations were recovered, we observed 39 had kidney defects (Table 1 and Supplementary Tables 1 and 2). The 39 lines had mutations in 11 genes that are cilia related and 15 genes that are not known to be cilia related (Table 1).
Among the renal anomalies observed, the most common phenotype observed was duplex kidney, clinically known as duplicated collecting duct (Fig. 1b, Cxcr4 and 1C, Plxnd1). The penetrance was variable, ranging from 15% in Cep290 mutants to 66% in Snx17 mutants (Table 1 and Supplementary Tables 1). Often the duplex kidneys were hydronephrotic, suggesting ureteral obstruction (Fig. 1c, Plxnd1). Duplex kidneys can arise from mutations in genes regulating ureteric bud formation on the mesonephric duct at the start of metanephric kidney development6. Duplex kidney has not been previously reported to be part of the ciliopathy spectrum and a role for cilia in ureteric bud formation is not currently known. However, our finding that four of the genes associated with duplex kidney are cilia related suggests that cilia are directly or indirectly regulating bud formation on the mesonephric duct. Hydronephrosis in the absence of duplex kidney was also observed with variable penetrance (Fig. 1e, Adamts6). Of the genes identified in this screen to cause duplex kidneys or hydronephrosis, only Wnt5a was previously shown to cause renal–urinary tract anomalies in humans. In humans, defects in Wnt5a cause Robinow syndrome, which includes skeletal, facial and genital abnormalities along with kidney and other anomalies7.
We also observed multiplex kidneys. This was associated with mutations in two non-cilia genes, Robo1 and Slit2. These mutants developed bilateral multiplex kidneys (Fig. 1d, Robo1). Robo2 and Slit2 mutations were previously shown to cause the multiplex kidney phenotype by allowing many ureteric buds to form on the mesonephric duct8. Interestingly, our mutant (line 872) harbours a predicted pathogenic mutation in the Robo2 orthologue Robo1. In addition, a second potential splice-site mutation was observed in Robo2, but transcript analysis of the skin tissue showed no Robo2 splicing defects. The Robo2 mutation also did not segregate with the kidney phenotype (Supplementary Fig. 1), further indicating Robo1 is the pathogenic mutation. It is interesting to note Robo1 has been shown to work with Slit2 in regulating mammary gland branching morphogenesis9 and in lung development10.
Cystic kidney disease was commonly observed in the CHD mutants (Fig. 1h–j). The cystic disease identified in our screen could be grouped into three distinct classes. The first group are those with cystic disease that may arise secondary to hydronephrosis. In this class only the kidney with hydronephrosis was cystic, whereas the contralateral kidney or non-hydronephrotic parts of a duplex kidney were not cystic (Fig. 1h, Nek8). The second class encompassing moderate cystic disease is marked by a few large kidney cysts and is associated with less extensive tubule dilation (Fig. 1i, Tbc1d32). This second class was equally distributed among the cilia versus non-cilia mutants, and included mutations in four cilia genes (Anks6, Lrp2, Ptk7 and Tbc1d32) and four non-cilia genes (Ap1b1, Ap2b1, Bmp10 and Zbtb14) (Table 1, Fig. 2 and Supplementary Fig. 2). Anks6 mutations cause nephronophthisis11 and a Tbc1d32 splice mutation was found in a single patient with oral facial digital syndrome and ambiguous genitalia12; however, the other genes are not currently known to cause renal–urinary tract anomalies. The third class of severe cystic kidney disease is marked by extensive cysts throughout the kidneys (Fig. 1j, Tmem67). Severe cystic disease was identified only in lines with cilia-related mutations including Bicc1, Cc2d2a, Tmem67, Cep290 and Pkd1 (Table 1, Supplementary Table 1 and Fig. 3). Bicc1 mutations are known to cause cystic renal dysplasia13, Pkd1 is the major cause of autosomal dominant PKD in humans14, and Cc2d2a, Tmem67 and Cep290 are well-established human ciliopathy genes15. These severe cystic kidney phenotypes are fully penetrant (Table 1). We also observed kidney phenotypes comprising bilateral and unilateral renal agenesis and/or hypoplasia (Fig. 1f, Frem2 and 1G, Plxnd1). This has variable penetrance and was observed in association with mutations in four non-cilia-related genes: Frem2, Lama5, Plxnd1 and Qrich1 (Table 1). Frem2 mutations in humans cause Frasier syndrome, which includes renal agenesis and other renal–urinary tract malformations in combination with other organ defects16. The other three genes are not known to cause renal–urinary tract malformations in humans.
We note the finding of renal anomalies in the CHD mutants is not simply a reflection of the high prevalence of cilia mutations, as 58% of the CHD mutant lines with renal anomalies have mutations in non-cilia genes. Although the severe cystic kidney disease phenotype was exclusively associated with cilia mutations, there was no correlation between ciliary assembly defects and cystogenesis in the prenatal period (Fig. 4a). For example, mutation of the retrograde intraflagellar transport motor, Dync2h1, disrupted ciliogenesis but this did not result in the formation of cysts in kidneys in mutants collected at term (Supplementary Fig. 3). Although unexpected, this finding is consistent with our prior observation that prenatal deletion of Ift20 or Ift140 did not cause cysts until the postnatal period17,18. These findings suggest the cilia components Cep290, Cc2d2a and Tmem67 may cause prenatal cysts by a fundamentally different mechanism than the cysts caused by intraflagellar transport (IFT) mutations.
Prenatal cysts and centriolar docking defects
Cep290, Cc2d2a and Tmem67, along with Mks1, Tmem216, B9D1, Tctn1 and Tctn2 form the tectonic complex in the ciliary transition zone19. Previously published work shows that Mks1 and B9D1 mutants, like Cep290, Cc2d2a, and Tmem67 mutants identified here, also exhibit prenatal renal cysts20,21. It is striking that five components of this complex cause prenatal cysts, as the number of published mutant mice with this phenotype is limited. Work in Caenorhabditis elegans suggests the tectonic complex is required for docking of centrioles on the ciliary vesicle and fusion of the nascent cilium to the plasma membrane. In contrast, the IFT proteins appear essential only for ciliary axonemal extension22. This suggests that prenatal cyst formation arises from a centriole docking defect rather than a ciliogenesis defect. To examine this possibility, we carried out transmission electron microscopy to assess centriole docking in kidney epithelial cells from Cep290 and Ift20 mutants and wild-type cells (Fig. 4d,e). In wild-type and Ift20 mutant cells we found, as expected, approximately half of the centrioles (presumably the mother centrioles) were docked on the membrane, while the other half (probably daughter centrioles) were in the cytoplasm away from the membrane. In contrast, only 10% of Cep290 centrioles were docked. We further used immunofluorescence microscopy to assess the distribution of the distal appendage marker Cep164, which should be assembled before ciliary docking and the transition zone marker Nphp1, which should be assembled after docking. This analysis showed that in Cep290 mutants, assembly of the distal appendages were not affected but formation of the transition zone was blocked. In contrast, the Ift20 mutation did not affect either of these events (Fig. 4f–k), supporting a role for this protein after docking of centrioles on the membrane. Together, these findings suggest that the disruption of centriole docking plays a critical role in formation of prenatal cysts.
Human CHD patients have associated renal anomalies
To determine the possible clinical relevance of our findings in mouse models, we recruited 77 patients with CHD requiring surgical intervention from the Children’s Hospital of Pittsburgh. Retrospective chart review showed 23 (30%) of the CHD patients had renal defects that spanned a spectrum of renal abnormalities (Fig. 5) including renal cysts, kidney agenesis, hydronephrosis and pelvicaliectasis (mild form of hydronephrosis), vesicoureteral reflux, duplicated collecting duct systems (duplex kidneys), ectopic kidney (malpositioned) and horseshoe kidneys (Supplementary Table 3). There was no correlation between cardiac lesion type and the different renal anomalies, similar to the findings in the CHD mutant mice. Together, these findings support a common aetiology for CHD and renal anomalies in the human population.
Our systematic analysis of mouse mutants with CHD showed that many of the mutations causing heart defects also caused renal anomalies. This included a number of genes that had an impact on ciliogenesis. Cilia are microtubule-based organelles that project from the cell surface and can be motile or non-motile, and both types play important roles in development, health and disease23. During development, motile and non-motile cilia regulate the specification of left–right patterning. Left–right patterning is critical to the development of the heart, lungs and other organs, and controls the differential placement of the left and right kidneys along the posterior–anterior axis. Non-motile primary cilia, which have important roles in sensory and cell signalling functions, also play critical roles during development. In the kidney, primary cilia defects are strongly associated with cystic kidney disease24. The major human autosomal dominant and autosomal recessive PKD proteins localize to the cilia and many genes that affect ciliary structure lead to cystic kidney disease. The mechanism of ciliary action in maintaining tubule architecture and preventing cyst formation is unknown, but various models propose a role for cilia in regulating Wnt signalling or detection of luminal flow to monitor tubule diameter.
Curiously, only a subset of cilia mutations caused severe cystic disease in the prenatal period. The fact that cilia are present on the tubular epithelium during prenatal development raises the question of why only a subset of genes affecting the formation of these epithelial cilia cause cysts before birth. To address this question, we examined the placement and maturation of centrioles in the mutants that cause prenatal cysts versus those that do not cause cysts during this time. We found that a prenatal cyst forming Cep290 mutation blocks ciliogenesis before assembly of the transition zone and plasma membrane docking, whereas an Ift20 mutation, which does not develop cysts in the prenatal period, did not block ciliogenesis until after the centriole docked and the transition zone was at least partially formed. These findings are consistent with prior studies showing disruption of transition zone assembly in Cc2d2a mutant fibroblasts25 and failure of centrosomes to migrate to the cell surface in Cep290 knockdown cells26. Taken together, these findings suggest a model where the cilium is not required for maintaining tubule architecture in the prenatal period as long as the centriole is properly docked on the plasma membrane. In the postnatal period, both docked and ciliated centrioles are required for maintaining tubule architecture and preventing cyst formation (Fig. 6). Previous work on mechanisms of tubulogenesis indicated that during the prenatal period, tubules elongate by a convergent extension mechanism, whereas postnatally this occurs via oriented cell division27. It is possible that the differences in the requirements of cilia and centrosomes during the two periods of development may reflect this transition. Our model would predict that any gene that prevents ciliation at a step before centriole docking should cause prenatal cysts, such as genes required for centriole biogenesis or formation of transition fibres. A number of mouse models have been generated with defects in centriole biogenesis but null alleles of all of these are lethal before the formation of the metanephric kidney28,29,30,31,32,33 and no studies with floxed or hypomorphic alleles30,34,35 have yet been performed that would independently test our model. It should be noted that our model does not predict that all genes that cause prenatal cysts are required for docking centrioles. Genes such as Pkd1 and Bicc1 identified in this screen as causing prenatal cysts are unlikely to function in centriole docking, but may play a role in signalling downstream of ciliary assembly.
The association of CHD with renal anomalies is not restricted to mice, as we also found a high incidence of structural renal defects in CHD patients recruited from the Children’s Hospital of Pittsburgh. These CHD patients had renal anomalies across the CAKUT and cystic kidney disease spectrum, similar to what we observed in the CHD mutant mice. Furthermore, our findings are in agreement with a previous epidemiological study in the Atlanta metro area, which showed 23% of ∼8,000 subjects with CHD also had renal abnormalities36. Thus, both the mouse and human studies indicate significant overlap in the genetic aetiology of CHD and kidney abnormalities. This probably reflects the conservation of developmental pathways and cell signalling mechanisms that regulate cardiovascular and renal development, including a central role for cilia in the pathogenesis of CHD and renal birth defects. In addition this work indicates that CHD patients would benefit from routine evaluation for renal anomalies to reduce potential renal complications and improve outcome in this high-risk patient population.
Overall, our studies provide compelling evidence of a genetic link between CHD and congenital kidney abnormalities. The finding of renal anomalies in mutants recovered in a CHD screen show the power of forward genetics in yielding novel insights into otherwise seemingly unrelated disease processes. As the genetics of CAKUT and other kidney defects are not well understood, with >90% being of unknown aetiology37,38, further exploration of this link may yield new insights into kidney anomalies and the mechanism of disease pathogenesis. These findings also suggest the interesting possibility that pooling CHD and CAKUT patient data may improve the power to detect mutations that can contribute to both CHD and renal anomalies. The mutant mouse models generated in this study are curated in the Mouse Genome Informatics Database and cryopreserved at the Jackson Laboratory for open public access. These mutant models will serve as an invaluable resource for exploring the mechanism of both cardiac and renal structural defects.
C57Bl/6J mice were mutated with ENU and bred to wild-type animals. Daughters were then bred back to their fathers and their embryos screened for structural birth defects. Details of the breeding and mutation identification are as described5.
All mouse work was approved by Institutional Animal Care and Use Committee (IACUCs) at the University of Pittsburgh or the University of Massachusetts Medical School.
Hematoxylin and Eosin. Paraffin sections for staining were dewaxed with SafeClear (Fisher Diagnostics) and rehydrated with graded aqueous solutions of isopropanol. The sections were stained for 4 min with CAT Hematoxylin (Biocare Medical), rinsed in running tap water for 30 s followed by three quick dips in saturated lithium carbonate and a rinse in distilled water. This was followed by 90% ethanol for 2 min, Edgar Degas Eosin (Biocare Medical) for 2 min and three quick rinses in 100% ethanol. The sections were cleared with Safeclear (two 5-min incubations) and were mounted with Permount (Fisher Scientific).
Immunofluorescence. Paraffin sections were dewaxed, rehydrated and subjected to antigen retrieval in an autoclave (250 °F, 40 min) with 10 mM sodium citrate at pH 6. After cooling to ambient temperature, the sections were treated with blocking solution (4% non-immune goat serum, 0.1% Triton X-100, 0.05% SDS and 0.1% fish skin gelatin (Sigma G7765) in TBST (0.05% Tween-20 in Tris-buffered saline pH 7.4)) for 30 min, subsequently washed with TBST and then exposed to primary antibodies overnight at 4 °C. The next day, the sections were washed with TBST, incubated with Alexa Fluor-conjugated secondary antibodies (Life Technologies) for 30 min at room temperature and washed with TBST followed by a rinse with TBS. The antibodies were brought to their working dilutions with 0.1% fish skin gelatin in TBS. The sections were then dipped for 5 s in 4,6-diamidino-2-phenylindole (1 μg ml−1 in TBS) and after rinsing with TBS were mounted with Prolong Gold (Life Technologies).
Primary antibodies used in this work include IFT88 (ref. 39), 6-11B-1 (Sigma T6793), GTU-88 (Sigma T5326), T1α (clone 8.1.1, Developmental Studies Hybridoma Bank, University of Iowa), Cep164 (Proteintech 22227-1-AP) and Nphp1 (ref. 40). Lectins used were fluorescein Dolichos biflorus agglutinin (Vector Labs FL-1031) as the marker for developing kidney collecting ducts and fluorescein Lotus tetragonolobus lectin for kidney proximal tubules (Vector Labs FL-1321).
Mouse kidney epithelial cells were derived from embryonic day 18 kidneys by dispersing the organs in trypsin, plating on plastic in medium composed of 45% DMEM (4.5 g l−1 glucose), 45% F12 and 10% FCS supplemented with penicillin and streptomycin. Epithelial cells were selected by the addition of 150 mM NaCl and 150 mM urea to the medium41.
Cells for immunofluorescence staining were grown on glass coverslips until confluent and then serum was reduced to 0.25% for 48 h before fixation and staining42,43. Quantification of ciliary antigens was done using the measurement tools of Openlab (Perkin Elmer).
Cells for electron microscopy were grown on tissue culture plastic until confluent and then serum was reduced to 0.25% for 48 h before fixation. Cells were fixed by adding 2.5% glutaraldehyde in 0.1 M Na Cacodylate buffer (pH 7.2) to the culture plates one drop at a time until the initial volume of media was doubled. The cells were allowed to stabilize in this solution for 10 min, all the media/glutaraldehyde was removed, fresh 2.5% glutaraldehyde in the same buffer was added and the cells were fixed for an additional 60 min at room temperature. After this primary fixation, the cells were rinsed three times in fresh fixation buffer for 10 min each time and were secondarily fixed with 1.0% osmium tetroxide in H2O for 1 h at room temperature. The cells were washed again three times in H2O and the cells were dehydrated through a graded series of ethanol (10–100%; three changes), and then transferred to ethanol 100%: SpiPon 812/Araldite 502 resin (50:50/V:V) for 12 h at room temperature. Following resin infiltration, the cells were transferred through three changes of pure SpiPon 812/Araldite 502 epoxy resin each 1 h long. The cells were then changed to a final step of embedding resin mixture and were polymerized for 2 days at 70 °C in their original culture dishes. The plates were then dunked in liquid nitrogen, to separate the bottom of the dish from the cells embedded in the resin. Pieces of the embedded cultures were re-oriented and mounted onto blank stubs with a drop of super glue and the blocks were trimmed and sectioned (100 nm thick). Sections were collected onto 200-mesh copper support grids and contrasted with uranyl acetate and lead citrate, and then imaged using a Philips CM 10 transmission electron microscope, under 80 Kv accelerating voltage. Images were recorded with a Gatan Erlangshen charge-coupled device digital camera.
Patient recruitment and analysis
Infants <1 year of age with CHD were prospectively enrolled at Children’s Hospital of Pittsburgh, University of Pittsburgh Medical Center (Pittsburgh, PA). Informed consent was obtained from parents or guardians of infants. The patient’s CHD diagnosis and other developmental abnormality findings were retrieved from the examination of the electronic medical records, with specific focus on information relating to renal and urinary tract abnormalities. This study was conducted in accordance with the human study protocol PRO09090021 approved by the Institutional Review Board of the University of Pittsburgh.
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This work was supported by funding from the National Institutes of Health GM060992 and DK103632 to G.J.P., and 5U01HL098180, 1S10 OD010340 and GM104412 to C.W.L.
The authors declare no competing financial interests.
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San Agustin, J., Klena, N., Granath, K. et al. Genetic link between renal birth defects and congenital heart disease. Nat Commun 7, 11103 (2016) doi:10.1038/ncomms11103
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