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Hospital de Órbigo, Spain

Xuncl M.,Servei de Bioquimica i Gentica Molecular | Badenas C.,Servei de Bioquimica i Gentica Molecular | Badenas C.,CIBER ISCIII | Badenas C.,IDIBAPS Institute dInvestigacions Biomdiques August Pi i Sunyer | And 17 more authors.
Reproductive BioMedicine Online | Year: 2010

Fragile X syndrome (FXS) is the most common inherited form of mental retardation. It is caused by a CGG repeat expansion, which results in hypermethylation and silencing of the FMR1 gene. The results from 213 FXS prenatal diagnoses performed in the study centre were reviewed. Family history of FXS or undiagnosed mental retardation (MR) were the reasons for referral and 64% of mothers were not aware of their status so prenatal and mother tests were performed at the same time. Among those women referred for family history of unknown MR, 17.6% were found to be FXS carriers. The attitudes and perceptions of the syndrome of 52 FXS carriers were also evaluated. Most of them had been diagnosed as carriers when the child was already born and the most common feeling was sadness, followed by impotence and guilt. The majority of them had received genetic counselling and they considered it useful. Regarding reproductive options, prenatal diagnosis was chosen by 40.5% of women. Prenatal diagnosis for FXS is a good reproductive option and it should be carried out whenever family history of MR is present. A high percentage of FXS carriers are detected following this approach. © 2010, Reproductive Healthcare Ltd. Published by Elsevier Ltd. All rights reserved.

Mademont-Soler I.,Servei de Bioquimica i Gentica Molecular | Morales C.,Servei de Bioquimica i Gentica Molecular | Morales C.,CIBER ISCIII | Clusellas N.,Servei de Bioquimica i Gentica Molecular | And 7 more authors.
European Journal of Obstetrics Gynecology and Reproductive Biology | Year: 2011

Chromosome abnormalities are one of the main causes of congenital defects, and establishing their frequency according to the different clinical indications for invasive procedure during pregnancy is especially important for genetic counselling. We analyzed the results of 29,883 amniotic fluid samples referred to our laboratory for cytogenetic studies from 1998 to 2009, which constitutes the largest series of cytogenetic analysis performed on amniotic fluid samples in Spain. The number of samples received tended to increase from 1998 to 2005, but after 2005 it decreased substantially. Cytogenetic results were obtained in 99.5% of the samples, and the detected incidence of chromosome abnormalities was 2.9%. Of these, 48.1% consisted of classical autosomal aneuploidies, trisomy 21 being the most frequent one. The main clinical indications for amniocentesis were positive prenatal screening and advanced maternal age, but referral reasons with highest positive predictive values were, excluding parental chromosome rearrangement, increased nuchal translucency (9.2%) and ultrasound abnormalities (6.6%). In conclusion, performing the karyotype on amniotic fluid samples is a good method for the detection of chromosome abnormalities during pregnancy. The number of cytogenetic studies on amniotic fluid has now decreased, however, due to the implementation of first trimester prenatal screening for the detection of Down syndrome, which allows karyotyping on chorionic villus samples. Our results also show that both ultrasound abnormalities and increased nuchal translucency are excellent clinical indicators for fetal chromosome abnormality. © 2011 Elsevier Ireland Ltd.

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