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  • Title: Molecular and cytogenetic characterization of a recurrent unbalanced translocation (4;21)(p16.3;q22.1): relevance to the Wolf-Hirschhorn and Down syndrome critical regions.
    Author: Sebastio G, Perone L, Guzzetta V, Sebastio L, Vicari L, Della Casa R, Gurrieri F, Zappata S, Pomponi MG, Mazzei A, Neri G, Andria G, Brahe C.
    Journal: Am J Med Genet; 1996 May 17; 63(2):366-72. PubMed ID: 8725787.
    Abstract:
    We report on an aneuploidy syndrome due to the unbalanced segregation of a familial translocation (4;21)(p16.3;q22.1) causing a partial 4p monosomy and a partial 21q trisomy. The three affected children presented with severe failure to thrive, short stature, microcephaly, profound hypotonia, and mental retardation. The face, very similar in the three children, is characterized by frontal bossing, upslanting of the palpebral fissures, short nose, and deep set ears, giving the overall appearance of the Down syndrome. The molecular study has defined the aneuploid segment on both 4p and 21q. Most of the Down syndrome critical region was found to the trisomic, while only part of the candidate Wolf-Hirschhorn syndrome critical region was deleted, suggesting that this region is not critical for the major malformations characteristic for WHS.
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