alexa Chromosomal Microarray In Detection Of Prenatal Submicroscopic Chromosome Abnormalities | 70152
ISSN: 2155-9821

Journal of Bioprocessing & Biotechniques
Open Access

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15th Asia-Pacific Biotechnology Congress
July 20-22, 2017 Melbourne, Australia

Meenu Singh, Brijesh Kumar, Anushka Shrivastava, Jyotsana Bharti, Tara Nath, Dinesh Singh Tekcham, Vaidehi Jobanputra, Rakesh Kumar Verma and Navneet Kumar
Noida Institute of Engineering & Technology, India
King George’s Medical University, India
Advanced Genomics Institute & Laboratory Medicine, India
Posters & Accepted Abstracts: J Bioprocess Biotech
DOI: 10.4172/2155-9821-C1-013
Abstract
Chromosomal Microarray Analysis (CMA) is a whole genome scan for detection of gain and loss of DNA (micro deletion/ duplication), also known as copy number variants (CNVs) and detection of copy neutral loss of hetrozygosity (LOH) or long contagious stretches of homozygosity or uniparental disomy. This test scans the entire genome and provides information on thousands of genes in a single test. Use of microarray in certain prenatal situations such as the fetus with structural anomalies or those who are stillborn appears to add important, clinically relevant information. Objective of the study was to demonstrate the utility of microarrays in detection of prenatal submicroscopic chromosome abnormalities. Chromosomal microarray was performed on prenatal samples (amniotic fluid) using the following microarray chips. The arrays included the loss of heterozygosity (LOH) determination and detection of uniparental iso-disomy (UPD). Analysis was done using Chromosome Analysis Suite (ChAS) software and clinical interpretation and reporting was done by ABMG certified geneticist. A total of 34 prenatal samples were analyzed for the study. The clinical indications included fetus with ultrasound abnormality (21); abnormal maternal serum screening (03), previous child with a chromosome abnormality (10). Out of these 34 cases with normal karyotype, 7 were found to be carrying a significant abnormality. Microarray analysis provides significantly more information as compared to traditional cytogenetic techniques and hence enables a clear causality and provides information that allows for an informed decision making and counseling in prenatal cases with high risk pregnancies, abnormal ultrasound findings etc. In few cases where the decision to terminate the pregnancy was already taken based on the ultrasound findings, microarray analysis provided enhanced information about the cause (including recurrence risks) of the Intra Uterine Growth Restriction (IUGR) and structural abnormalities. Microarray test can also be used in prenatal diagnosis even in the absence of an index case and also for analysis products of conception. This test is of enormous practical value to patients and physicians because it provides accurate genetic information which can be used for improved diagnosis and treatment decisions.
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