Interchromosomal effects for chromosome 21 in carriers of structural chromosome reorganizations determined by fluorescence in situ hybridization on sperm nuclei

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Abstract

We have used dual color fluorescence in situ hybridization (FISH) on decondensed sperm heads from four carriers of structural chromosome reorganizations, viz. t(3;15), t(Y;7), t(13;22) and inv(9), to assess the possible existence of an interchromosomal effect (ICE) on the segregation of chromosome 21. In the carriers of t(Y;7), t(13;22) and inv(9), all results were within the limits described in controls. A highly significant increase (P < 0.0001) of disomy 21 (1.90% v 0.37%), which could be considered as a positive ICE, was observed in the t(3;15) carrier. Significantly higher percentages (P < 0.0001) of diploid sperm (5.71% v. 0.27%) were also observed in this patient. Our results suggests that the occurrence of an ICE may depend on the reorganization and on the chromosome and chromosome regions involved, resulting in a particular meiotic behaviour (presence of unsynapsed regions, preferential meiotic configurations) that could lead to the observed increase in chromosome 21 disomies. Further studies with this technical approach in a wide range of structural reorganizations could help to elucidate the actual occurrence of ICEs.
Original languageEnglish
Pages (from-to)500-505
JournalHuman Genetics
Volume106
DOIs
Publication statusPublished - 1 Jan 2000

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