Further molecular and clinical delineation of co-locating 17p13.3 microdeletions and microduplications that show distinctive phenotypes

Damien L. Bruno, Britt-Marie Anderlid, Anna Lindstrand, Conny van Ravenswaaij-Arts, Devika Ganesamoorthy, Johanna Lundin, Christa Lese Martin, Jessica Douglas, Catherine Nowak, Margaret P. Adam, R. Frank Kooy, Nathalie Van der Aa, Edwin Reyniers, Geert Vandeweyer, Irene Stolte-Dijkstra, Trijnie Dijkhuizen, Alison Yeung, Martin Delatycki, Birgit Borgstrom, Lena ThelinCarlos Cardoso, Bregje van Bon, Rolph Pfundt, Bert B. A. de Vries, Anders Wallin, David J. Amor, Paul A. James, Howard R. Slater*, Jacqueline Schoumans

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    111 Citations (Scopus)

    Abstract

    Background Chromosome 17p13.3 contains extensive repetitive sequences and is a recognised region of genomic instability. Haploinsufficiency of PAFAH1B1 (encoding LIS1) causes either isolated lissencephaly sequence or Miller-Dieker syndrome, depending on the size of the deletion. More recently, both microdeletions and microduplications mapping to the Miller-Dieker syndrome telomeric critical region have been identified and associated with distinct but overlapping phenotypes.

    Methods Genome-wide microarray screening was performed on 7678 patients referred with unexplained learning difficulties and/or autism, with or without other congenital abnormalities. Eight and five unrelated individuals, respectively, were identified with microdeletions and microduplications in 17p13.3.

    Results Comparisons with six previously reported microdeletion cases identified a 258 kb critical region, encompassing six genes including CRK (encoding Crk) and YWHAE (encoding 14-3-3 epsilon). Clinical features included growth retardation, facial dysmorphism and developmental delay. Notably, one individual with only subtle facial features and an interstitial deletion involving CRK but not YWHAE suggested that a genomic region spanning 109 kb, encompassing two genes (TUSC5 and YWHAE), is responsible for the main facial dysmorphism phenotype. Only the microduplication phenotype included autism. The microduplication minimal region of overlap for the new and previously reported cases spans 72 kb encompassing a single gene, YWHAE. These genomic rearrangements were not associated with low-copy repeats and are probably due to diverse molecular mechanisms.

    Conclusions The authors further characterise the 17p13.3 microdeletion and microduplication phenotypic spectrum and describe a smaller critical genomic region allowing identification of candidate genes for the distinctive facial dysmorphism (microdeletions) and autism (microduplications) manifestations.

    Original languageEnglish
    Pages (from-to)299-311
    Number of pages13
    JournalJOURNAL OF MEDICAL GENETICS
    Volume47
    Issue number5
    DOIs
    Publication statusPublished - May-2010

    Keywords

    • MENTAL-RETARDATION
    • GENOMIC HYBRIDIZATION
    • NUMBER VARIATION
    • DIEKER-SYNDROME
    • ALU REPEATS
    • REARRANGEMENTS
    • ARRAY
    • DELETIONS
    • IMPACT
    • GENE

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