ArticleClinical genetics2025
A Novel De Novo Missense Variant in Netrin-1 (NTN1) Associated With Chorioretinal Coloboma, Sensorineural Hearing Loss and Polydactyly.
Article in Clinical genetics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Microphthalmia, anophthalmia and coloboma (MAC) comprise a highly heterogeneous spectrum of congenital ocular malformations with an estimated incidence of 1 in 5000 to 1 in 30 000 live births. Although there is likely to be a genetic component in the majority of cases, many remain without a molecular diagnosis. Netrin-1 was previously identified as a mediator of optic fissure closure from transcriptome analyses of chick and zebrafish and was shown to cause ocular coloboma when knocked out in both mouse and zebrafish. Here, we report the first patient with chorioretinal coloboma and microphthalmia harbouring a novel heterozygous likely pathogenic NTN1 missense variant, c.1483T>A p.(Tyr495Asn), validating a conserved gene function in ocular development. In addition, the patient displayed bilateral sensorineural hearing loss which was investigated by examining the sensory hair cells of ntn1a morphant zebrafish, suggesting a role for netrin-1 in hair cell development.
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