Molecular testing for Fragile X Syndrome: Lessons learned from 119,232 tests performed in a clinical laboratory
| Autor: | Weimin Sun, Joy B Redman, Mei Peng, Charles M. Strom, Matthew McGinnis, Raymond G. Fenwick, Franklin Quan, Arlene Buller, Beryl Crossley |
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| Rok vydání: | 2007 |
| Předmět: |
Adult
Male Heterozygote medicine.medical_specialty Genetic counseling Genetic Counseling Prenatal diagnosis Fragile X Mental Retardation Protein Gene Frequency Prenatal Diagnosis medicine Humans Genetic Testing Allele Child Genetics (clinical) Genetics Carrier signal Fetus Obstetrics business.industry medicine.disease FMR1 Fragile X syndrome Fragile X Syndrome Female Laboratories Trinucleotide Repeat Expansion business |
| Zdroj: | Genetics in Medicine. 9:46-51 |
| ISSN: | 1098-3600 |
| DOI: | 10.1097/gim.0b013e31802d833c |
| Popis: | Purpose: To examine the data from over 119,000 Fragile X Syndrome tests and 307 prenatal tests to detect unsuspected findings and obtain clinical data when indicated to optimize genetic counseling. Methods: A proprietary database containing 119,232 consecutive postnatal and 307 prenatal FXS tests performed between November 2, 1992 and June 1, 2006 was queried. Results: The distribution of normal FMR1 alleles was a bimodal distribution with a major peak at 30 repeats and a minor peak at 21 repeats. Of 59,707 tests performed for males, 1.4% had a fully expanded and methylated FMR1 allele. Of 59,525 tests performed for females, 0.61% had an affected FMR1 allele, and 1.7% had a premutation FMR1 allele for a total carrier frequency of 1.3%. When fetuses inherited an expanded maternal allele, the risk of expansion to a full affected allele was 0%, 5%, 30% and 100% for allele sizes of 100 repeats, respectively. Conclusions: These figures can be used for genetic counseling of patients presenting for carrier detection and prenatal diagnosis for Fragile X Syndrome. |
| Databáze: | OpenAIRE |
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