Am J Med Genet A.: auth.: group Reymond

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Am J Med Genet A. 2021 Feb 2. doi: 10.1002/ajmg.a.62098. Online ahead of print.

Ophthalmic phenotypes associated with biallelic loss-of-function PCDH12 variants

Francesca Mattioli 1, Norine Voisin 1, Eglė Preikšaitienė 2, Irina Kozlovskaja 3, Vaidutis Kučinskas 2, Alexandre Reymond 1Affiliations expand

Abstract

Individuals carrying biallelic loss-of-function mutations in PCDH12 have been reported with three different conditions: the diencephalic-mesencephalic junction dysplasia syndrome 1 (DMJDS1), a disorder characterized by global developmental delay, microcephaly, dystonia, and a midbrain malformation at the diencephalic-mesencephalic junction; cerebral palsy combined with a neurodevelopmental disorder; and cerebellar ataxia with retinopathy. We report an additional patient carrying a homozygous PCDH12 frameshift, whose anamnesis combines the most recurrent DMJDS1 clinical features, that is, global developmental delay, microcephaly, and ataxia, with exudative vitreoretinopathy. This case and previously published DMJDS1 patients presenting with nonspecific visual impairments and ophthalmic disorders suggest that ophthalmic alterations are an integral part of clinical features associated with PCDH12 loss-of-function.

Keywords: PCDH12; diencephalic-mesencephalic junction dysplasia syndrome; retinopathy.