8p23.1 duplication syndrome; a novel genomic condition with unexpected complexity revealed by array CGH

John C K Barber, Viv K. Maloney, Shuwen Huang, David J. Bunyan, Lara Cresswell, Esther Kinning, Anna Benson, Tim Cheetham, Jonathan Wyllie, Sally Ann Lynch, Simon Zwolinski, Laura Prescott, Yanick Crow, Rob Morgan, Emma Hobson

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The 8p23.1 deletion syndrome is established but not an equivalent duplication syndrome. Here, we report five patients; a de novo prenatal case and two families in which 8p23.1 duplications have been directly transmitted from mothers to children. Dual-colour fluorescent in situ hybridisation, multiplex ligation-dependent probe amplification analysis and customised oligonucleotide array comparative genomic hybridisation (oaCGH) indicated an ∼3.75Mb duplication of most of band 8p23.1 between the olfactory receptor/defensin repeats (ORDRs) in all cases. However, oaCGH revealed an additional duplication of 500kb adjacent to the proximal ORDR in Family 1 and an additional deletion of 3.14Mb within the Nablus Mask-Like Facial Syndrome region of 8q22.1 in Family 2. Copy number variation at introns 4-5 of the GATA4 gene was also identified. This 8p23.1 duplication syndrome is associated with a characteristic facial phenotype including a prominent forehead and arched eyebrows. Adrenal insufficiency, Tetralogy of Fallot, partial 2/3 syndactyly of the toes and cleft palate in some individuals may be explained by ascertainment bias, incomplete penetrance and/or the presence of the microdeletion in Family 2. The duplication is compatible with normal early childhood development but, although our adult cases live independent lives with varying degrees of support, learning difficulties have been experienced by some family members. We conclude that the 8p23.1 duplication syndrome is a genomic condition with an emerging but variable phenotype that may be under-diagnosed. Our results demonstrate that direct transmission does not distinguish genuine duplications from euchromatic variants and illustrate the power of array CGH to reveal unexpected additional imbalances in affected patients.
    Original languageEnglish
    Pages (from-to)18-27
    Number of pages9
    JournalEuropean Journal of Human Genetics
    Volume16
    Issue number1
    DOIs
    Publication statusPublished - Jan 2008

    Keywords

    • genetics: Abnormalities, Multiple
    • Adult
    • Chromosome Aberrations
    • genetics: Chromosomes, Human, Pair 8
    • Cytogenetics
    • Female
    • Gene Dosage
    • Humans
    • In Situ Hybridization, Fluorescence
    • Infant
    • Infant, Newborn
    • Male
    • Molecular Biology
    • Nucleic Acid Hybridization
    • Oligonucleotide Array Sequence Analysis
    • Phenotype
    • Pregnancy

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