Abstract
Severe ventriculomegaly is a rare congenital brain defect, usually detected in utero, of poor neurodevelopmental prognosis. This ventricular enlargement can be the consequence of different mechanisms: either by a disruption of the cerebrospinal fluid circulation or abnormalities of its production/absorption. The aqueduct stenosis is one of the most frequent causes of obstructive ventriculomegaly, however, fewer than 10 genes have been linked to this condition and molecular bases remain often unknown. We report here 4 fetuses from 2 unrelated families presenting with ventriculomegaly at prenatal ultra-sonography as well as an aqueduct stenosis and skeletal abnormalities as revealed by fetal autopsy. Genome sequencing identified biallelic pathogenic variations in LIG4, a DNA-repair gene responsible for the LIG4 syndrome which associates a wide range of clinical manifestations including developmental delay, microcephaly, short stature, radiation hypersensitivity and immunodeficiency. Thus, not only this report expands the phenotype spectrum of LIG4-related disorders, adding ventriculomegaly due to aqueduct stenosis, but we also provide the first neuropathological description of fetuses carrying LIG4 pathogenic biallelic variations.
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Data availability
All data generated or analyzed during this study are included in the published article (and its supplementary information files). The genetic variations identified there are already present in ClinVar (ID: 429520, 433156, 7673, cf. Supplementary Fig. 1) and we have submitted them again as pathogenic/likely pathogenic in ClinVar (submission name: SUB14153886, accession numbers: SCV004231896, SCV004231897, SCV004231898).
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Acknowledgements
This research was made possible through access to the data generated by the France Genomic Medicine Plan 2025. We wish to express our sincere gratitude to the parents for their participation.
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R.N. and L.B contributed to synthetizing and reviewing data, and writing of the manuscript. L.L., A.F, NT., S.G., N.B., A.C., T.R. and F.R. contributed to generation of data and provided feedback on the manuscript. T.A.B provided project supervision and reviewed the manuscript.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all the parents of the fetuses included in this study.
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Nicolle, R., Boutaud, L., Loeuillet, L. et al. Expanding the phenotypic spectrum of LIG4 pathogenic variations: neuro-histopathological description of 4 fetuses with stenosis of the aqueduct. Eur J Hum Genet (2024). https://doi.org/10.1038/s41431-024-01558-2
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DOI: https://doi.org/10.1038/s41431-024-01558-2