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  • Title: Mosaicism for del(17)(p11.2p11.2) underlying the Smith-Magenis syndrome.
    Author: Juyal RC, Kuwano A, Kondo I, Zara F, Baldini A, Patel PI.
    Journal: Am J Med Genet; 1996 Dec 11; 66(2):193-6. PubMed ID: 8958329.
    Abstract:
    Smith-Magenis syndrome (SMS) is a multiple congenital anomalies/mental retardation syndrome associated with deletion of band p11.2 of chromosome 17. The deletion is typically detected by high-resolution cytogenetic analysis of chromosomes from peripheral lymphocytes. Fluorescence in situ hybridization (FISH) has been previously used to rule out apparent mosaicism for del(17)(p11.2p11.2) indicated by routine cytogenetics. We now report mosaicism for del(17)(p11.2p11.2) in a child with SMS. The mosaicism had gone undetected during previous routine cytogenetic analysis. FISH analysis of peripheral lymphocytes as well as immortalized lymphoblasts using markers from 17p11.2 revealed that approximately 60% of cells carried the deletion. To our knowledge, this is the first case of SMS associated with mosaicism for del(17)(p11.2p11.2).
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