Diploid-Triploid Mosaicism

Overview

Type of disease: Rare conditions

Diploid-triploid mosaicism is a chromosome disorder.  Individuals with diploid-triploid syndrome have some cells with three copies of each chromosome for a total of 69 chromosomes (called triploid cells) and some cells with the usual 2 copies of each chromosome for a total of 46 chromosomes (called diploid cells).  Having two or more different cell types is called mosaicism. Diploid-triploid mosaicism can be associated with  truncal obesity, body/facial asymmetry, weak muscle tone (hypotonia), delays in growth, mild differences in facial features, fusion or webbing between some of the fingers and/or toes (syndactyly) and irregularities in the skin pigmentation.    Intellectual disabilities may be present but are highly variable from person to person ranging from mild to more severe.   The chromosome disorder is usually not present in the blood; a skin biopsy, or analyzing cells in the urine is needed to detect the triploid cells.  Source: Genetic and Rare Diseases Information Center (GARD), supported by ORDR-NCATS and NHGRI.

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