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    Biallelic variants in LINGO1 are associated with autosomal recessive intellectual disability, microcephaly, speech and motor delay

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    Author
    Ansar, M.
    Riazuddin, S.
    Sarwar, M.T.
    Date
    2018
    Journal
    Genetics in Medicine
    Publisher
    Nature Publishing Group
    Type
    Article
    
    Metadata
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    See at
    https://dx.doi.org/10.1038/gim.2017.113
    Abstract
    Purpose: To elucidate the novel molecular cause in two unrelated consanguineous families with autosomal recessive intellectual disability. Methods: A combination of homozygosity mapping and exome sequencing was used to locate the plausible genetic defect in family F162, while only exome sequencing was followed in the family PKMR65. The protein 3D structure was visualized with the University of California-San Francisco Chimera software. Results: All five patients from both families presented with severe intellectual disability, aggressive behavior, and speech and motor delay. Four of the five patients had microcephaly. We identified homozygous missense variants in LINGO1, p.(Arg290His) in family F162 and p.(Tyr288Cys) in family PKMR65. Both variants were predicted to be pathogenic, and segregated with the phenotype in the respective families. Molecular modeling of LINGO1 suggests that both variants interfere with the glycosylation of the protein. Conclusion: LINGO1 is a transmembrane receptor, predominantly found in the central nervous system. Published loss-of-function studies in mouse and zebrafish have established a crucial role of LINGO1 in normal neuronal development and central nervous system myelination by negatively regulating oligodendrocyte differentiation and neuronal survival. Taken together, our results indicate that biallelic LINGO1 missense variants cause autosomal recessive intellectual disability in humans. Copyright 2017 The Author(s).
    Keyword
    consanguineous families
    developmental delay
    intellectual disability
    LINGO1
    Identifier to cite or link to this item
    https://www.scopus.com/inward/record.uri?eid=2-s2.0-85049920012&doi=10.1038%2fgim.2017.113&partnerID=40&md5=551f5d78de5e0ce09f1f93c2cee138ed; http://hdl.handle.net/10713/9757
    ae974a485f413a2113503eed53cd6c53
    10.1038/gim.2017.113
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