Dominant variants in PRR12 result in unilateral or bilateral complex microphthalmia.

Abstract:

:Complex microphthalmia is characterized by small eyes with additional abnormalities that may include anterior segment dysgenesis. While many genes are known, a genetic cause is identified in only 4-30% of microphthalmia, with the lowest rate in unilateral cases. We identified four novel pathogenic loss-of-function alleles in PRR12 in families affected by complex microphthalmia and/or Peters anomaly, including two de novo, the first dominantly transmitted allele, as well as the first splicing variant. The ocular phenotypes were isolated with no additional systemic features observed in two unrelated families. Remarkably, ocular phenotypes were asymmetric in all individuals and unilateral (with structurally normal contralateral eye) in three. There are only three previously reported PRR12 variants identified in probands with intellectual disability, neuropsychiatric disorders, and iris anomalies. While some overlap with previously reported cases is seen, nonsyndromic developmental ocular anomalies are a novel phenotype for this gene. Additional phenotypic expansions included short stature and normal development/cognition, each noted in two individuals in this cohort, as well as absence of neuropsychiatric disorders in all. This study identifies new associations for PRR12 disruption in humans and presents a genetic diagnosis resulting in unilateral ocular phenotypes in a significant proportion of cases.

journal_name

Clin Genet

journal_title

Clinical genetics

authors

Reis LM,Costakos D,Wheeler PG,Bardakjian T,Schneider A,Fung SSM,University of Washington Center for Mendelian Genomics.,Semina EV

doi

10.1111/cge.13897

subject

Has Abstract

pub_date

2020-12-13 00:00:00

eissn

0009-9163

issn

1399-0004

pub_type

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