Abstract
Small supernumerary marker chromosomes (sSMC) are a morphological heterogeneous group of additional abnormal chromosomes that cannot be characterized alone by conventional banding cytogenetics. Molecular cytogenetic techniques are valuable tools for the accurate identification of sSMC and a prerequisite for sound genetic counseling based on refined genotype/phenotype correlation. We describe a new case of a retarded patient with an sSMC derived from chromosome 5. The characterization of the sSMC was done by subcentromere-specific multicolor (subcenM) fluorescence in-situ hybridization (FISH) and by full tilling resolution array analysis, after microdissection and amplification of the marker DNA. Uniparental disomy for normal sister chromosomes of the sSMC(5) was excluded. The karyotype was mos47,XX,+r(5)(::p11.1 → q12.1::)[70%]/46,XX[30%], being the trisomic region between 46.15 ∼ 49.56 Mb and 61.25 ∼ 61.335 Mb, a region known to harbor ∼45 annotated genes. Together with a review of the previously described cases of sSMC(5) and duplications involving the 5q proximal region, we can conclude that trisomy of the 5q11 region is associated with learning difficulties and speech delay.
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Acknowledgments
We thank the patient for her cooperation. Supported in part by ProChance 2008 of the Friedrich Schiller University Jena (21007091) and ProChance 2009.
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Melo, J.B., Backx, L., Vermeesch, J.R. et al. Chromosome 5 derived small supernumerary marker: towards a genotype/phenotype correlation of proximal chromosome 5 imbalances. J Appl Genetics 52, 193–200 (2011). https://doi.org/10.1007/s13353-011-0035-3
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DOI: https://doi.org/10.1007/s13353-011-0035-3