Garcia-Peiro A.,Unitat de Biologia Cellular i Genetica Medica |
Garcia-Peiro A.,Autonomous University of Barcelona |
Oliver-Bonet M.,Unitat de Biologia Cellular i Genetica Medica |
Oliver-Bonet M.,Unitat dInvestigacio Hospital Universitari Son Dureta |
And 6 more authors.
International Journal of Andrology | Year: 2011
This investigation was conducted to assess the baseline level of sperm DNA fragmentation (SDF) in a cohort of patients presenting chromosomal rearrangements (nine reciprocal translocations and two inversions). In a separate experiment, a dynamic analysis to calculate the rate of SDF (rSDF), after a varying period of sperm storage (0h, 1h, 4h, 8h and 24h) at 37°C, was performed. Results were compared with eight fertile donors. Different experimental approaches to assess SDF, such as terminal transferase dUTP nick-end labelling (TUNEL), sperm chromatin structure assay (SCSA) and sperm chromatin dispersion test (SCDt), were used. No differences for the baseline level of SDF were found. Carriers of reorganized genomes showed statistically higher levels of SDF than did control donors (p=0.025 for TUNEL; p=0.022 for SCSA; p=0.014 for SCDt). However, 54.5% (6/11) of the patients presented values similar to those of control donors. There was no significant difference in rSDF (p=0.34). Nevertheless, the results suggest that a high variability for SDF and rSDF exists in these patients. Routine analysis of SDF and rSDF should be considered in patients presenting rearranged genomes to determine fertility status for assisted reproductive techniques (ART) purposes. © 2011 The Authors. International Journal of Andrology © 2011 European Academy of Andrology.
Templado C.,Unitat de Biologia Cellular i Genetica Medica |
Templado C.,Autonomous University of Barcelona |
Vidal F.,Autonomous University of Barcelona |
Cytogenetic and Genome Research | Year: 2011
We reviewed the frequency and distribution of disomy in spermatozoa obtained by multicolor-FISH analysis on decondensed sperm nuclei in (a) healthy men, (b) fathers of aneuploid offspring of paternal origin and (c) individuals with Klinefelter syndrome and XYY males. In series of healthy men, disomy per autosome is approximately 0.1% but may range from 0.03 (chromosome 8) to 0.47 (chromosome 22). The great majority of authors find that chromosome 21 (0.18%) and the sex chromosomes (0.27%) have significantly elevated frequencies of disomy although these findings are not universal. The total disomy in FISH studies is 2.26% and the estimated aneuploidy (2× disomy) is 4.5%, more than double that seen in sperm karyotypes (1.8%). Increased disomy levels of low orders of magnitude have been reported in spermatozoa of some normal men (stable variants) and in men who have fathered children with Down, Turner and Klinefelter syndromes. These findings suggest that men with a moderately elevated aneuploidy rate may be at a higher risk of fathering paternally derived aneuploid pregnancies. Among lifestyle factors, smoking, alcohol and caffeine have been studied extensively but the compounding effects of the 3 are difficult to separate because they are common lifestyle behaviors. Increases in sex chromosome abnormalities, some autosomal disomies, and in the number of diploid spermatozoa are general features in 47,XXY and 47,XYY males. Aneuploidy of the sex chromosomes is more frequent than aneuploidy of any of the autosomes not only in normal control individuals, but also in patients with sex chromosome abnormalities and fathers of paternally derived Klinefelter, Turner and Down syndromes. Copyright © 2011 S. Karger AG, Basel.
Obradors A.,Unitat de Biologia Cellular i Genetica Medica |
Rius M.,Unitat de Biologia Cellular i Genetica Medica |
Daina G.,Unitat de Biologia Cellular i Genetica Medica |
Ramos L.,Unitat de Biologia Cellular i Genetica Medica |
And 2 more authors.
Cytogenetic and Genome Research | Year: 2011
The study of aneuploidy in human oocytes, discarded from IVF cycles, has provided a better understanding of the incidence of aneuploidy of female origin and the responsible mechanisms. Comparative genomic hybridization (CGH) is an established technique that allows for the detection of aneuploidy in all chromosomes avoiding artifactual chromosome losses. In this review, results obtained using CGH in single cells (1PB and/or MII oocytes) are included. The results of oocyte aneuploidy rates obtained by CGH from discarded oocytes of IVF patients and of oocyte donors are summarized. Moreover, the mechanisms involved in the aneuploid events, e.g. whether alterations occurred due to first meiotic errors or germ-line mitotic errors are also discussed. Finally, the incidence of aneuploid oocyte production due to first meiotic errors and germ-line mitotic errors observed in oocytes coming from IVF patients and IVF oocyte donors was assessed. Copyright © 2011 S. Karger AG, Basel.