Loss of Function of RIMS2 Causes a Syndromic Congenital Cone-Rod Synaptic Disease with Neurodevelopmental and Pancreatic Involvement.

American journal of human genetics 2020 Jun 04

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Congenital cone-rod synaptic disorder (CRSD), also known as incomplete congenital stationary night blindness (iCSNB), is a non-progressive inherited retinal disease (IRD) characterized by night blindness, photophobia, and nystagmus, and distinctive electroretinographic features. Here, we report bi-allelic RIMS2 variants in seven CRSD-affected individuals from four unrelated families. Apart from CRSD, neurodevelopmental disease was observed in all affected individuals, and abnormal glucose homeostasis was observed in the eldest affected individual. RIMS2 regulates synaptic membrane exocytosis. Data mining of human adult bulk and single-cell retinal transcriptional datasets revealed predominant expression in rod photoreceptors, and immunostaining demonstrated RIMS2 localization in the human retinal outer plexiform layer, Purkinje cells, and pancreatic islets. Additionally, nonsense variants were shown to result in truncated RIMS2 and decreased insulin secretion in mammalian cells. The identification of a syndromic stationary congenital IRD has a major impact on the differential diagnosis of syndromic congenital IRD, which has previously been exclusively linked with degenerative IRD. Copyright © 2020 The Authors. Published by Elsevier Inc. All rights reserved.

Citation

Sabrina Mechaussier, Basamat Almoallem, Christina Zeitz, Kristof Van Schil, Laila Jeddawi, Jo Van Dorpe, Alfredo Dueñas Rey, Christel Condroyer, Olivier Pelle, Michel Polak, Nathalie Boddaert, Nadia Bahi-Buisson, Mara Cavallin, Jean-Louis Bacquet, Alexandra Mouallem-Bézière, Olivia Zambrowski, José Alain Sahel, Isabelle Audo, Josseline Kaplan, Jean-Michel Rozet, Elfride De Baere, Isabelle Perrault. Loss of Function of RIMS2 Causes a Syndromic Congenital Cone-Rod Synaptic Disease with Neurodevelopmental and Pancreatic Involvement. American journal of human genetics. 2020 Jun 04;106(6):859-871