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| The first 150 words of the full text of this article appear below. |
EDITOR
Uniparental disomy (UPD) is the
inheritance of both copies of a chromosome or a chromosomal region from
one parent.1 2 When both chromosomes from one parent are
present the phenomenon is called "heterodisomy", whereas the
presence of two copies of only one of the parental chromosomes is
called "isodisomy". A map of UPD for the human genome has been
proposed and covers several areas of the 22 autosomes and the X
chromosome.1 3 Not unexpectedly, growth abnormalities and
other endocrine disturbances appear to be frequent in patients with UPD
for whole chromosomes or even for small chromosomal
regions.3 Although UPD appears to be rare among patients
with various congenital defects,4 disomic human sperm
nuclei are present relatively frequently and without interchromosomal
differences.5 The true incidence of UPD may be
significantly higher if the various molecular and cytogenetic possibilities for disomy are considered, and the genome is tested by
densely located polymorphic
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