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Case Reports
Journal Article
Somatically Acquired Isodicentric Y and Mosaic Loss of Chromosome Y in a Boy with Hypospadias.
Isodicentric Y chromosome [idic(Y)] represents a relatively common subtype of Y chromosomal rearrangements in the germline; however, limited evidence supports the postzygotic occurrence of idic(Y). Here, we report a boy with hypospadias and somatically acquired idic(Y). The 3.5-year-old boy has been identified in our previous study for patients with hypospadias. In the present study, cytogenetic analysis including FISH revealed a 45,X[5]/46,X,idic(Y)[7]/46,XY[8] karyotype. MLPA showed a mosaic deletion involving PPP1R12BP1 and RBMY2DP. The idic(Y) was likely to have been formed through aberrant recombination between P1 palindromes and subsequently underwent mosaic loss. The patient's phenotype was attributable to deletion of some Y chromosomal genes and/or mosaic loss of chromosome Y (mLOY). The results suggest that idic(Y) can originate in postzygotic cells via palindrome-mediated crossovers. Moreover, our data indicate that somatically acquired idic(Y) can trigger mLOY, which usually appears as an aging-related phenomenon in elderly men.
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