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Allelic Dropout in the ENG Gene, Affecting the Results of Genetic Testing in Hereditary Hemorrhagic Telangiectasia.
MedLine Citation:
PMID:  23046070     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Background: Hereditary hemorrhagic telangiectasia (HHT) is an autosomal-dominant vascular disorder with three disease-causing genes identified to date: ENG, ACVRL1, and SMAD4. We report an HHT patient with allelic dropout that on routine sequence analysis for a known mutation in the family (c.817-3T>G in ENG) initially seemed to be homozygous for the mutation. Aim: To explore the possibility of allelic dropout causing a false result in this patient. Methods: Mutation analysis of additional family members was performed and haplotype analysis carried out. New primers were designed to reveal the presence of a possible sequence variant, which could explain the presumed allelic dropout. Results: Allelic dropout caused by a six-nucleotide duplication close to the standard reverse primer was the assumed cause of a false homozygous diagnosis. Conclusion: Sequence variants outside of the primer regions can be the cause of allelic dropout, creating unforeseen errors in genotyping. Our finding emphasizes the need for careful quality control in all molecular genetic studies.
Authors:
Pernille M Tørring; Anette D Kjeldsen; Lilian Bomme Ousager; Charlotte Brasch-Andersen; Klaus Brusgaard
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-9
Journal Detail:
Title:  Genetic testing and molecular biomarkers     Volume:  -     ISSN:  1945-0257     ISO Abbreviation:  Genet Test Mol Biomarkers     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101494210     Medline TA:  Genet Test Mol Biomarkers     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1 Department of Clinical Genetics, Odense University Hospital, University of Southern Denmark , Odense C, Denmark .
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