SIPA1L3 identified by linkage analysis and whole-exome sequencing as a novel gene for autosomal recessive congenital cataract

• Verfasst von: Evers, Christina [VerfasserIn]
• Verfasst von: Paramasivam, Nagarajan [VerfasserIn]
• Verfasst von: Hinderhofer, Katrin [VerfasserIn]
• Verfasst von: Fischer, Christine [VerfasserIn]
• Verfasst von: Granzow, Martin [VerfasserIn]
• Verfasst von: Schmidt-Bacher, Annette [VerfasserIn]
• Verfasst von: Eils, Roland [VerfasserIn]
• Verfasst von: Steinbeisser, Herbert [VerfasserIn]
• Verfasst von: Schlesner, Matthias [VerfasserIn]
• Verfasst von: Moog, Ute [VerfasserIn]
• Titel: SIPA1L3 identified by linkage analysis and whole-exome sequencing as a novel gene for autosomal recessive congenital cataract
• Verf.angabe: Christina Evers, Nagarajan Paramasivam, Katrin Hinderhofer, Christine Fischer, Martin Granzow, Annette Schmidt-Bacher, Roland Eils, Herbert Steinbeisser, Matthias Schlesner, and Ute Moog
• E-Jahr: 2015
• Jahr: 25 March 2015
• Umfang: 7 S.
• Fussnoten: Gesehen am 20.07.2020
• Titel Quelle: Enthalten in: European journal of human genetics
• Ort Quelle: Basingstoke : Stockton Press, 1998
• Jahr Quelle: 2015
• Band/Heft Quelle: 23(2015), 12, Seite 1627-1633
• ISSN Quelle: 1476-5438
• DOI: doi:10.1038/ejhg.2015.46
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1725119196

Abstract

Congenital cataract (CC) is one of the most important causes for blindness or visual impairment in infancy. A substantial proportion of isolated CCs has monogenic causes. The disease is genetically heterogeneous, and all Mendelian modes of inheritance have been reported. We mapped a locus for isolated CC on 19p13.1-q13.2 in a distantly consanguineous German family with two sisters affected by dense white cataracts. Whole-exome sequencing identified a homozygous nonsense variant c.4489C>T (p.(R1497*)) in SIPA1L3 (signal-induced proliferation-associated 1 like 3) in both affected children. SIPA1L3 encodes a GTPase-activating protein (GAP), which interacts with small GTPases of the Rap family via its Rap-GAP-domain. The suggested role of Rap GTPases in cell growth, differentiation and organization of the cytoskeleton in the human lens, and lens-enriched expression of the murine ortholog gene Sipa1l3 in embryonic mice indicates that this gene is crucial for early lens development. Our results provide evidence that sequence variants in human SIPA1L3 cause autosomal recessive isolated CC and give new insight into the molecular pathogenesis underlying human cataracts.