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WNT3 involvement in human bladder exstrophy and cloaca development in zebrafish
Karolinska Inst, Dept Womens & Childrens Hlth, SE-17176 Stockholm, Sweden.;Karolinska Inst, Ctr Mol Med, SE-17176 Stockholm, Sweden.;Karolinska Univ Hosp, Astrid Lindgren Children Hosp, Dept Clin Genet, SE-17176 Stockholm, Sweden..
Karolinska Inst, Ctr Mol Med, SE-17176 Stockholm, Sweden.;Karolinska Inst, Dept Mol Med & Surg, SE-17176 Stockholm, Sweden..
Karolinska Inst, Dept Womens & Childrens Hlth, SE-17176 Stockholm, Sweden.;Karolinska Inst, Ctr Mol Med, SE-17176 Stockholm, Sweden..
Karolinska Inst, Dept Womens & Childrens Hlth, SE-17176 Stockholm, Sweden.;Karolinska Inst, Ctr Mol Med, SE-17176 Stockholm, Sweden..
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2015 (English)In: Human Molecular Genetics, ISSN 0964-6906, E-ISSN 1460-2083, Vol. 24, no 18, 5069-5078 p.Article in journal (Refereed) Published
Abstract [en]

Bladder exstrophy, a severe congenital urological malformation when a child is born with an open urinary bladder, is the most common form of bladder exstrophy-epispadias complex (BEEC) with an incidence of 1: 30,000 children of Caucasian descent. Recent studies suggest that WNT genes may contribute to the etiology of bladder exstrophy. Here, we evaluated WNT-pathway genes in 20 bladder exstrophy patients using massively parallel sequencing. In total 13 variants were identified in WNT3, WNT6, WNT7A, WNT8B, WNT10A, WNT11, WNT16, FZD5, LRP1 and LRP10 genes and predicted as potentially disease causing, of which seven variants were novel. One variant, identified in a patient with a de novo nonsynonymous substitution in WNT3 (p.Cys91Arg), was further evaluated in zebrafish. Knock down of wnt3 in zebrafish showed cloaca malformations, including disorganization of the cloaca epithelium and expansion of the cloaca lumen. Our study suggests that the function of the WNT3 p.Cys91Arg variant was altered, since RNA overexpression of mutant Wnt3 RNA does not result in embryonic lethality as seen with wild-type WNT3 mRNA. Finally, we also mutation screened the WNT3 gene further in 410 DNA samples from BEEC cases and identified one additional mutation c.638G> A (p.Gly213Asp), which was paternally inherited. In aggregate our data support the involvement of WNT-pathway genes in BEEC and suggest that WNT3 in itself is a rare cause of BEEC.

Place, publisher, year, edition, pages
2015. Vol. 24, no 18, 5069-5078 p.
National Category
Pediatrics Medical Genetics
Identifiers
URN: urn:nbn:se:uu:diva-264631DOI: 10.1093/hmg/ddv225ISI: 000361317200001OAI: oai:DiVA.org:uu-264631DiVA: diva2:862703
Funder
Swedish Research Council, K2012-64X-14506-10-5 2012-1526Stockholm County CouncilThe Karolinska Institutet's Research FoundationThe Swedish Brain FoundationKnut and Alice Wallenberg Foundation
Available from: 2015-10-23 Created: 2015-10-15 Last updated: 2017-12-01Bibliographically approved

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