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Molecular assay reagents intended for use in identifying the abnormal situation in which both members of the chromosome pair 15 are inherited from the mother (i.e., uniparental disomy [UPD]) and the father\'s chromosome for that pair is missing. Maternally inherited disomy 15 results in Prader-Willi syndrome, which is characterized by neonatal hyponia, poor suck and failure to thrive, developmental delay and/or disability, childhood onset obesity, short stature, hypogonadism, and severe behavior problems. 25% of Prader-Willi syndrome patients have maternal UPD15, and 70% have a partial deletion of 15q.
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