Abstract:
:Renal agenesis and hypodysplasia (RHD) are major causes of pediatric chronic kidney disease and are highly genetically heterogeneous. We conducted whole-exome sequencing in 202 case subjects with RHD and identified diagnostic mutations in genes known to be associated with RHD in 7/202 case subjects. In an additional affected individual with RHD and a congenital heart defect, we found a homozygous loss-of-function (LOF) variant in SLIT3, recapitulating phenotypes reported with Slit3 inactivation in the mouse. To identify genes associated with RHD, we performed an exome-wide association study with 195 unresolved case subjects and 6,905 control subjects. The top signal resided in GREB1L, a gene implicated previously in Hoxb1 and Shha signaling in zebrafish. The significance of the association, which was p = 2.0 × 10-5 for novel LOF, increased to p = 4.1 × 10-6 for LOF and deleterious missense variants combined, and augmented further after accounting for segregation and de novo inheritance of rare variants (joint p = 2.3 × 10-7). Finally, CRISPR/Cas9 disruption or knockdown of greb1l in zebrafish caused specific pronephric defects, which were rescued by wild-type human GREB1L mRNA, but not mRNA containing alleles identified in case subjects. Together, our study provides insight into the genetic landscape of kidney malformations in humans, presents multiple candidates, and identifies SLIT3 and GREB1L as genes implicated in the pathogenesis of RHD.
journal_name
Am J Hum Genetjournal_title
American journal of human geneticsauthors
Sanna-Cherchi S,Khan K,Westland R,Krithivasan P,Fievet L,Rasouly HM,Ionita-Laza I,Capone VP,Fasel DA,Kiryluk K,Kamalakaran S,Bodria M,Otto EA,Sampson MG,Gillies CE,Vega-Warner V,Vukojevic K,Pediaditakis I,Makar GS,Mdoi
10.1016/j.ajhg.2017.09.018subject
Has Abstractpub_date
2017-11-02 00:00:00pages
789-802issue
5eissn
0002-9297issn
1537-6605pii
S0002-9297(17)30387-7journal_volume
101pub_type
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