Pre- and postnatal genetic testing by array-comparative genomic hybridization: genetic counseling perspectives

Genetics in Medicine : Official Journal of the American College of Medical Genetics
Sandra DarilekChristine M Eng

Abstract

Recently, a new genetic test has been developed that allows a more detailed examination of the genome when compared with a standard chromosome analysis. Array comparative genomic hybridization (CGH microarray; also known as chromosome microarray analysis) in effect, combines chromosome and fluorescence in situ hybridization analyses allowing detection not only of aneuploidies, but also of all known microdeletion and microduplication disorders, including telomere rearrangements. Since 2004, this testing has been available in the Medical Genetics Laboratory at Baylor College of Medicine for postnatal evaluation and diagnosis of individuals with suspected genomic disorders. Subsequently, to assess the feasibility of offering CGH microarray for prenatal diagnosis, a prospective study was conducted on 98 pregnancies in a clinical setting comparing the results obtained from array CGH with those obtained from a standard karyotype. This was followed by the availability of prenatal testing on a clinical basis in 2005. To date, we have analyzed over 8000 cases referred to our clinical laboratory, including approximately 300 prenatal cases. With the clinical introduction of any new testing strategy, and particularly one focused on genetic...Continue Reading

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