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Mutations in the Spliceosome Component CWC27 Cause Retinal Degeneration with or without Additional Developmental Anomalies

2017; Elsevier BV; Volume: 100; Issue: 4 Linguagem: Inglês

10.1016/j.ajhg.2017.02.008

1537-6605

Mingchu Xu, Ya‐Jing Xie, Hana Abouzeid, Christopher T. Gordon, Alessia Fiorentino, Zixi Sun, Anna Lehman, Ihab S. Osman, Rachayata Dharmat, Rosa Riveiro-Álvarez, Linda Bapst-Wicht, Darwin Babino, Gavin Arno, Virginia Busetto, Li Zhao, Hui Li, Miguel Ángel López-Martínez, Liliana F. Azevedo, Laurence Hubert, Nikolas Pontikos, Aiden Eblimit, Isabel Lorda‐Sánchez, Valeria Kheir, Vincent Plagnol, Myriam Oufadem, Zachry T. Soens, Lizhu Yang, Christine Bôle‐Feysot, Rolph Pfundt, Nathalie Allaman-Pillet, Patrick Nitschké, Michael E. Cheetham, Stanislas Lyonnet, Smriti A. Agrawal, Huajin Li, Gaëtan Pinton, Michel Michaelides, Claude Besmond, Yumei Li, Zhisheng Yuan, Johannes von Lintig, Andrew R. Webster, Hervé Le Hir, Peter Stoilov, Jeanne Amiel, Alison J. Hardcastle, Carmen Ayuso, Ruifang Sui, Rui Chen, Rando Allikmets, Daniel F. Schorderet, Graeme Black, Georgina Hall, Rachel Gillespie, Simon Ramsden, Forbes D.C. Manson, Panagiotis I. Sergouniotis, Chris F. Inglehearn, Carmel Toomes, Manir Ali, Martin McKibbin, James A. Poulter, Emma Lord, Andrea H. Németh, Stephanie Halford, Susan M. Downes, Jing Yu,

RNA modifications and cancer

Pre-mRNA splicing factors play a fundamental role in regulating transcript diversity both temporally and spatially. Genetic defects in several spliceosome components have been linked to a set of non-overlapping spliceosomopathy phenotypes in humans, among which skeletal developmental defects and non-syndromic retinitis pigmentosa (RP) are frequent findings. Here we report that defects in spliceosome-associated protein CWC27 are associated with a spectrum of disease phenotypes ranging from isolated RP to severe syndromic forms. By whole-exome sequencing, recessive protein-truncating mutations in CWC27 were found in seven unrelated families that show a range of clinical phenotypes, including retinal degeneration, brachydactyly, craniofacial abnormalities, short stature, and neurological defects. Remarkably, variable expressivity of the human phenotype can be recapitulated in Cwc27 mutant mouse models, with significant embryonic lethality and severe phenotypes in the complete knockout mice while mice with a partial loss-of-function allele mimic the isolated retinal degeneration phenotype. Our study describes a retinal dystrophy-related phenotype spectrum as well as its genetic etiology and highlights the complexity of the spliceosomal gene network. Pre-mRNA splicing factors play a fundamental role in regulating transcript diversity both temporally and spatially. Genetic defects in several spliceosome components have been linked to a set of non-overlapping spliceosomopathy phenotypes in humans, among which skeletal developmental defects and non-syndromic retinitis pigmentosa (RP) are frequent findings. Here we report that defects in spliceosome-associated protein CWC27 are associated with a spectrum of disease phenotypes ranging from isolated RP to severe syndromic forms. By whole-exome sequencing, recessive protein-truncating mutations in CWC27 were found in seven unrelated families that show a range of clinical phenotypes, including retinal degeneration, brachydactyly, craniofacial abnormalities, short stature, and neurological defects. Remarkably, variable expressivity of the human phenotype can be recapitulated in Cwc27 mutant mouse models, with significant embryonic lethality and severe phenotypes in the complete knockout mice while mice with a partial loss-of-function allele mimic the isolated retinal degeneration phenotype. Our study describes a retinal dystrophy-related phenotype spectrum as well as its genetic etiology and highlights the complexity of the spliceosomal gene network.