Targeted Gene Sequencing and Whole-Exome Sequencing in Autopsied Fetuses with Prenatally Diagnosed Kidney Anomalies

M Rasmussen, L Sunde, M L Nielsen, M Ramsing, A Petersen, T D Hjortshøj, T E Olsen, A Tabor, J M Hertz, I Johnsen, L Sperling, O B Petersen, U B Jensen, F G Møller, M B Petersen, D L Lildballe

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Identification of fetal kidney anomalies invites questions about underlying causes and recurrence risk in future pregnancies. We therefore investigated the diagnostic yield of next-generation sequencing in fetuses with bilateral kidney anomalies and the correlation between disrupted genes and fetal phenotypes. Fetuses with bilateral kidney anomalies were screened using an in-house-designed kidney-gene panel. In families where candidate variants were not identified, whole-exome sequencing was performed. Genes uncovered by this analysis were added to our kidney panel. We identified likely deleterious variants in 11 of 56 (20%) families. The kidney-gene analysis revealed likely deleterious variants in known kidney developmental genes in 6 fetuses and TMEM67 variants in 2 unrelated fetuses. Kidney histology was similar in the latter 2 fetuses—presenting a distinct prenatal form of nephronophthisis. Exome sequencing identified ROBO1 variants in one family and a GREB1L variant in another family. GREB1L and ROBO1 were added to our kidney-gene panel and additional variants were identified. Next-generation sequencing substantially contributes to identifying causes of fetal kidney anomalies. Genetic causes may be supported by histological examination of the kidneys. This is the first time that SLIT-ROBO signaling is implicated in human bilateral kidney agenesis.

OriginalsprogEngelsk
TidsskriftClinical Genetics
Vol/bind93
Udgave nummer4
Sider (fra-til)860-869
ISSN0009-9163
DOI
StatusUdgivet - apr. 2018

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Rasmussen, M., Sunde, L., Nielsen, M. L., Ramsing, M., Petersen, A., Hjortshøj, T. D., Olsen, T. E., Tabor, A., Hertz, J. M., Johnsen, I., Sperling, L., Petersen, O. B., Jensen, U. B., Møller, F. G., Petersen, M. B., & Lildballe, D. L. (2018). Targeted Gene Sequencing and Whole-Exome Sequencing in Autopsied Fetuses with Prenatally Diagnosed Kidney Anomalies. Clinical Genetics, 93(4), 860-869. https://doi.org/10.1111/cge.13185