Homozygous frameshift mutations in FAT1 cause a syndrome characterized by colobomatous-microphthalmia, ptosis, nephropathy and syndactyly

Najim Lahrouchi, Aman George, Ilham Ratbi, Ronen Schneider, Siham C. Elalaoui, Shahida Moosa, Sanita Bharti, Ruchi Sharma, Mones Abu-Asab, Felix Onojafe, Najlae Adadi, Elisabeth M. Lodder, Fatima Zahra Laarabi, Yassine Lamsyah, Hamza Elorch, Imane Chebbar, Alex V. Postma, Vassilios Lougaris, Alessandro Plebani, Janine AltmuellerHenriette Kyrieleis, Vardiella Meiner, Helen McNeill, Kapil Bharti, Stanislas Lyonnet, Bernd Wollnik, Alexandra Henrion-Caude, Amina Berraho, Friedhelm Hildebrandt, Connie R. Bezzina, Brian P. Brooks, Abdelaziz Sefiani

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14 Scopus citations

Abstract

A failure in optic fissure fusion during development can lead to blinding malformations of the eye. Here, we report a syndrome characterized by facial dysmorphism, colobomatous microphthalmia, ptosis and syndactyly with or without nephropathy, associated with homozygous frameshift mutations in FAT1. We show that Fat1 knockout mice and zebrafish embryos homozygous for truncating fat1a mutations exhibit completely penetrant coloboma, recapitulating the most consistent developmental defect observed in affected individuals. In human retinal pigment epithelium (RPE) cells, the primary site for the fusion of optic fissure margins, FAT1 is localized at earliest cell-cell junctions, consistent with a role in facilitating optic fissure fusion during vertebrate eye development. Our findings establish FAT1 as a gene with pleiotropic effects in human, in that frameshift mutations cause a severe multi-system disorder whereas recessive missense mutations had been previously associated with isolated glomerulotubular nephropathy.

Original languageEnglish
Article number1180
JournalNature communications
Volume10
Issue number1
DOIs
StatePublished - Dec 1 2019

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