ArticleEuropean journal of human genetics : EJHG2025
GJA8-associated developmental eye disorders: a new multicentre study highlights mutational hotspots and genotype-phenotype correlations.
Article in European journal of human genetics : EJHG, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Identification of Variants in Two Families With Congenital Cataract by Whole Exome Sequencing.Molecular genetics & genomic medicine · 2026Article
- Characterization of Ocular Developmental Disorders in the Israeli Population: Genotype-Phenotype Correlations and Novel Candidate Genes.Biomolecules · 2026Article
- Pathobiology of the developing eye lens: regulation of intracellular MAPK-signalling pathways to prevent lens dysplasia.Eye (London, England) · 2026Review
- Genetic Landscape of Congenital Cataracts in a Swiss Cohort: Addressing Diagnostic Oversights in Nance-Horan Syndrome.Biomedicines · 2025Article
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Authors and funding
23 authors.
Funding
Abstract
Variants in gap junction protein alpha 8 (GJA8), the gene encoding connexin 50 (Cx50), are primarily associated with developmental cataract, although some are associated with severe structural eye anomalies, such as aphakia (absent lens), microphthalmia (small eyes), and sclerocornea. To further define the relationship of GJA8 variants to ocular developmental disorders, we screened four large international cohorts with structural eye anomalies, including anophthalmia, microphthalmia, and coloboma (AMC) or cataracts. We identified 15 new families carrying 14 different heterozygous GJA8 variants (12 missense variants and two 1q21 microdeletions). The missense variants comprised 10 previously reported alterations in cases with eye anomalies [p.(Gly22Ser), p.(Val44Met), p.(Asp67Gly), p.(Arg76Cys), p.(Pro88Leu), p.(Gly94Glu), p.(Gly94Arg), p.(His98Arg), p.(Pro189Ser), and p.(Arg198Trp)] and two not yet linked with disease [p.(Thr39Met) and p.(Tyr66Asp)]. Their associated phenotypes ranged from isolated cataracts to a combination of microphthalmia and cataract with/without sclerocornea. Our study confirms GJA8 variants as an important source of genetic diagnoses for families with structural eye anomalies in addition to cataract and highlights specific mutational hotspots. Furthermore, we confirm an important genotype-phenotype correlation between sclerocornea and the p.(Gly94Arg) variant, and detail intra- and inter-familial phenotypic variability, which is important for clinical assessment and genetic counselling.
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