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Early-onset retinal dystrophy and chronic dermatitis in a girl with an undiagnosed congenital disorder of glycosylation (SRD5A3-CDG).
Ophthalmic Genetics 2018 October
PURPOSE: Early-onset retinal dystrophy is usually isolated but can also be the presenting manifestation of an undiagnosed systemic disease. The purpose of this report is to highlight the initial presentation of a girl with early-onset retinal dystrophy and chronic dermatitis who was found to have an undiagnosed congenital disorder of glycosylation (SRD5A3-CDG).
METHODS: Retrospective case report.
RESULTS: A 13-year-old Baluchi girl was referred for evaluation of low vision since soon after birth. Clinical exam confirmed retinal dystrophy. She also had developmental disability and chronic dermatitis. Brain MRI was normal. Whole exome and confirmatory Sanger sequencing uncovered homozygosity for a SRDA3 deletion (p.Gln96delinsX) that was previously reported in two other Baluchi SRDA3-CDG families with ocular coloboma, optic atrophy, atopic dermatitis, cerebellar hypoplasia, and developmental disability. Early-onset retinal dystrophy was not mentioned in those two families but has since been documented in other SRDA3-CDG families harboring different biallelic variants in the gene.
DISCUSSION: Early-onset retinal dystrophy with chronic dermatitis should raise suspicion for biallelic SRDA3 mutations, particularly in the context of developmental disability. Exome sequencing can be a useful analysis in retinal dystrophy patients with multisystem disease. Homozygosity for the SRDA3 deletion p.Gln96delinsX is not always associated with ocular coloboma.
METHODS: Retrospective case report.
RESULTS: A 13-year-old Baluchi girl was referred for evaluation of low vision since soon after birth. Clinical exam confirmed retinal dystrophy. She also had developmental disability and chronic dermatitis. Brain MRI was normal. Whole exome and confirmatory Sanger sequencing uncovered homozygosity for a SRDA3 deletion (p.Gln96delinsX) that was previously reported in two other Baluchi SRDA3-CDG families with ocular coloboma, optic atrophy, atopic dermatitis, cerebellar hypoplasia, and developmental disability. Early-onset retinal dystrophy was not mentioned in those two families but has since been documented in other SRDA3-CDG families harboring different biallelic variants in the gene.
DISCUSSION: Early-onset retinal dystrophy with chronic dermatitis should raise suspicion for biallelic SRDA3 mutations, particularly in the context of developmental disability. Exome sequencing can be a useful analysis in retinal dystrophy patients with multisystem disease. Homozygosity for the SRDA3 deletion p.Gln96delinsX is not always associated with ocular coloboma.
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