Garcia-Quevedo L.,University of Barcelona |
Blanco J.,University of Barcelona |
Sarrate Z.,University of Barcelona |
Catal V.,Prenatal Genetics S.L. |
And 2 more authors.
Background: Most individuals with Klinefelters syndrome (KS) are azoospermic but residual foci of spermatogenesis have been observed in some patients. However, no consistent predictive factors for testicular sperm extraction success have been established and mosaicism could be a factor to investigate. In this study, we have assessed the degree of mosaicism in somatic and germinal tissues in KS, the meiotic competence of 47,XXY germ cells and the aneuploidy rate of post-reductional cells.Methods: Five patients with KS previously diagnosed as pure 47,XXY have been studied. Samples from four donors were processed as controls. The chromosome constitution of lymphocytes, buccal mucosa and testicular tissue was assessed by interphase fluorescence in situ hybridization for chromosomes X, Y and 18. In meiotic figures, sex chromosome number and pairing was confirmed.Results: 46,XY cell lines were observed in all patients and tissues analysed. The degree of mosaicism (mean ± SD) differed among tissues (lowest in lymphocytes: 4.8 ± 2.5; highest in Sertoli cells: 42.3 ± 11.1). Meiotic figures were found in three cases (KS1, KS2 and KS5), all of them showed an XY complement. Hyperhaploid post-reductional cells were found in all patients (range: 3.336.4) and increased rates versus controls (P< 0.05) were observed. Conclusions: Diagnosis of homogeneous KS based on lymphocyte karyotyping should be contrasted in other tissues. Mucosa cells could help to better approximate the degree of germ cell mosaicism. Our Results: indicate that 47,XXY germ cells are not meiotically competent. Increased post-reductional aneuploidy rate is related to meiotic errors in 46,XY cells. Appropriate genetic counselling is recommended in KS. © 2011 The Author. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. All rights reserved. Source
Gimenez C.,Reprogenetics Spain S.A. |
Sarasa J.,Oxford Business Park |
Arjona C.,Reprogenetics Spain S.A. |
Vilamajo E.,Institute Reproduccion CEFER Lleida |
And 5 more authors.
Reproductive BioMedicine Online
Preimplantation genetic diagnosis (PGD) was carried out for a couple carrying a de-novo deletion in the TSC2 gene, responsible for tuberous sclerosis. Karyomapping, a method employing genome-wide analysis of single nucleotide polymorphisms (SNP), was used as PGD protocol. Analysis of DNA from the affected parent using karyomapping confirmed the region covered by the deletion and revealed more than 30 SNP located within the affected region. These SNP were subsequently used for embryo diagnosis (deletion revealed by hemizygosity and/or reduced probe intensity). Seven blastocyst embryos underwent trophectoderm biopsy followed by vitrification. Biopsied cells were subjected to comprehensive aneuploidy screening using microarray comparative genomic hybridization (aCGH), with karyomapping for the detection of embryos carrying the mutant TSC2 gene carried out in tandem. Two embryo transfers were performed, the second of which resulted in the birth of a child. This study highlights that karyomapping may be applicable to a subset of de-novo mutations undetectable using standard PGD strategies. Additionally, karyomapping results were in complete concordance with aCGH, both methods revealing the same aneuploidies in the embryos tested. It was concluded that karyomapping may represent a valuable advance in cases of PGD for monogenic diseases. © 2015 Reproductive Healthcare Ltd. Source
Martorell M.R.,Unitat de Reproduccio Humana i Diagnostic Genetic |
Martinez-Pasarell O.,Laboratori Of Seminologia I Embriologia |
Lopez O.,Laboratori Of Seminologia I Embriologia |
Polo A.,Laboratori Of Seminologia I Embriologia |
And 3 more authors.
Cytogenetic and Genome Research
Two fragile sites, FRA16B and FRA16C, are located in the chromosome band 16q22.1. Neither of them is associated with any specific clinical condition. We report the development and outcome of a clinically applied PGD cycle in a couple who had difficulty in achieving pregnancy. The woman was a carrier of a balanced reciprocal translocation, t(11;22)(q23;q11.2), and the man presented high expression of the fragile site 16q22.1 (FRA16B/C) in peripheral blood lymphocytes. Gains and losses of chromosome 16 fragments were detected in sperm and embryos. To our knowledge, this is the first documented case suggesting a link between FRA16B/C and chromosome 16 abnormalities in embryos and sperm from a carrier. © 2014 S. Karger AG, Basel. Source