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Sperm rates of 7q11.23, 15q11q13 and 22q11.2 deletions and duplications: a FISH approach

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Abstract

Genomic disorders are human diseases caused by meiotic chromosomal rearrangements of unstable regions flanked by Low Copy Repeats (LCRs). LCRs act as substrates for Non-Allelic Homologous Recombination (NAHR) leading to deletions and duplications. The aim of this study was to assess the basal frequency of deletions and duplications of the 7q11.23, 15q11-q13 and 22q11.2 regions in spermatozoa from control donors to check differences in the susceptibility to generate anomalies and to assess the contribution of intra- and inter-chromatid NAHR events. Semen samples from ten control donors were processed by FISH. A customized combination of probes was used to discriminate among normal, deleted and duplicated sperm genotypes. A minimum of 10,000 sperm were assessed per sample and region. There were no differences in the mean frequency of deletions and duplications (del + dup) among the 7q11.23, 15q11-q13 and 22q11.2 regions (frequency ± SEM, 0.37 ± 0.02; 0.46 ± 0.07 and 0.27 ± 0.07%, respectively) (P = 0.122). Nevertheless, hierarchical cluster analysis reveals interindividual differences suggesting that particular haplotypes could be the main source of variability in NAHR rates. The mean frequency of deletions was not different from the mean frequency of duplications in the 7q11.23 (P = 0.202) and 15q11-q13 (P = 0.609) regions, indicating a predominant inter-chromatid NAHR. By contrast, in the 22q11.2 region the frequency of deletions slightly exceed duplications (P = 0.032), although at the individual level any donor showed differences. Altogether, our results support the inter-chromatid NAHR as the predominant mechanism involved in the generation of sperm deletions and duplications.

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Acknowledgments

This work was supported by the projects CF-180034 (Universitat Autònoma de Barcelona) and SAF 2010-22241 (Ministerio de Ciencia e Inovación). Oscar Molina is the recipient of a grant from Universitat Autònoma de Barcelona (PIF/2007).

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  1. Unitat de Biologia Cel·lular, Facultat de Biociències, Universitat Autònoma de Barcelona, 08193, Bellaterra (Cerdanyola del Vallès), Spain

    Oscar Molina, Ester Anton, Francesca Vidal & Joan Blanco

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  1. Oscar Molina
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  2. Ester Anton
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  3. Francesca Vidal
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  4. Joan Blanco
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Correspondence to Joan Blanco.

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Molina, O., Anton, E., Vidal, F. et al. Sperm rates of 7q11.23, 15q11q13 and 22q11.2 deletions and duplications: a FISH approach. Hum Genet 129, 35–44 (2011). https://doi.org/10.1007/s00439-010-0894-4

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