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  • Title: A translocation t(6;7)(p11-p12;q22) associated with autism and mental retardation: localization and identification of candidate genes at the breakpoints.
    Author: Vincent JB, Choufani S, Horike S, Stachowiak B, Li M, Dill FJ, Marshall C, Hrynchak M, Pewsey E, Ukadike KC, Friedman JM, Srivastava AK, Scherer SW.
    Journal: Psychiatr Genet; 2008 Jun; 18(3):101-9. PubMed ID: 18496206.
    Abstract:
    OBJECTIVES: Our aim is to use information from cytogenetic anomalies to identify candidate genes for autism. METHODS: We have identified a male patient with mental retardation and autism who has a balanced translocation involving chromosomes 6 and 7, described as t(6;7)(p11-p12;q22). This translocation was inherited from an apparently normal father. RESULTS: Using fluorescence in situ hybridization, we have localized the breakpoints on both the chromosomes; and using bioinformatic genomic analysis, we have identified a number of potential candidate genes at these loci. These include the neural pentraxin 2 gene, NPTX2, and a novel gene encoding a transmembrane protein, TMEM130, which contains a polycystic kidney domain on 7q22. On 6p12 the breakpoint directly interrupts isoform 2 of the human homologue of the mouse dystonin gene. We also performed a 250 K single nucleotide polymorphism microarray analysis and comparative genomic hybridization using a bacterial artificial chromosome microarray to look for minor genomic deletions or duplications in the proband's DNA. The single nucleotide polymorphism microarray analysis identified a number of copy number variants, remote from the translocation breakpoints, containing potential candidate genes. CONCLUSION: It is conceivable that one or more of the copy number variant regions or either of the two breakpoint locations and the dystonin gene, in particular, may be a new locus for a form of mental retardation, which may also include autistic features.
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