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Type: Journal article
Title: Yunis-Varón Syndrome is caused by mutations in FIG4, encoding a phosphoinositide phosphatase
Other Titles: Yunis-Varon Syndrome is caused by mutations in FIG4, encoding a phosphoinositide phosphatase
Author: Campeau, P.
Lenk, G.
Lu, J.
Bae, Y.
Burrage, L.
Turnpenny, P.
Corona-Rivera, J.
Morandi, L.
Mora, M.
Reutter, H.
Vulto-van Silfhout, A.
Faivre, L.
Haan, E.
Gibbs, R.
Meisler, M.
Lee, B.
Citation: American Journal of Human Genetics, 2013; 92(5):781-791
Publisher: Univ Chicago Press
Issue Date: 2013
ISSN: 0002-9297
Statement of
Philippe M. Campeau, Guy M. Lenk, James T. Lu, Yangjin Bae, Lindsay Burrage, Peter Turnpenny, Jorge Román Corona-Rivera, Lucia Morandi, Marina Mora, Heiko Reutter, Anneke T. Vulto-van Silfhout, Laurence Faivre, Eric Haan, Richard A. Gibbs, Miriam H. Meisler, and Brendan H. Lee
Abstract: Yunis-Varón syndrome (YVS) is an autosomal-recessive disorder with cleidocranial dysplasia, digital anomalies, and severe neurological involvement. Enlarged vacuoles are found in neurons, muscle, and cartilage. By whole-exome sequencing, we identified frameshift and missense mutations of FIG4 in affected individuals from three unrelated families. FIG4 encodes a phosphoinositide phosphatase required for regulation of PI(3,5)P(2) levels, and thus endosomal trafficking and autophagy. In a functional assay, both missense substitutions failed to correct the vacuolar phenotype of Fig4-null mouse fibroblasts. Homozygous Fig4-null mice exhibit features of YVS, including neurodegeneration and enlarged vacuoles in neurons. We demonstrate that Fig4-null mice also have small skeletons with reduced trabecular bone volume and cortical thickness and that cultured osteoblasts accumulate large vacuoles. Our findings demonstrate that homozygosity or compound heterozygosity for null mutations of FIG4 is responsible for YVS, the most severe known human phenotype caused by defective phosphoinositide metabolism. In contrast, in Charcot-Marie-Tooth disease type 4J (also caused by FIG4 mutations), one of the FIG4 alleles is hypomorphic and disease is limited to the peripheral nervous system. This genotype-phenotype correlation demonstrates that absence of FIG4 activity leads to central nervous system dysfunction and extensive skeletal anomalies. Our results describe a role for PI(3,5)P(2) signaling in skeletal development and maintenance.
Keywords: Fibroblasts
Cleidocranial Dysplasia
Limb Deformities, Congenital
Ectodermal Dysplasia
Genetic Predisposition to Disease
Phosphoric Monoester Hydrolases
Phosphatidylinositol Phosphates
Sequence Analysis, DNA
Base Sequence
Bone Development
Frameshift Mutation
Mutation, Missense
Molecular Sequence Data
Rights: ©2013 by The American Society of Human Genetics. All rights reserved
DOI: 10.1016/j.ajhg.2013.03.020
Appears in Collections:Aurora harvest
Molecular and Biomedical Science publications

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