Document Detail

Detection of errors in dinucleotide repeat typing by nondenaturing electrophoresis.
MedLine Citation:
PMID:  11545389     Owner:  NLM     Status:  MEDLINE    
This study shows that consideration of minor bands (heteroduplex, shadow, and faint bands) associated with allele bands in nondenaturing polyacrylamide gel electrophoresis (PAGE) after polymerase chain reaction (PCR) is effective for detecting PCR processing errors that lead to mistyping of heterozygotes as homozygotes. Notably, we show that minor bands in native gels are highly effective for detecting allele dropout and preferential amplification in PCR amplification of dinucleotide repeats. These findings are based on an analysis of Mendelian inheritance patterns in families, and the reproduction of heterozygous band patterns by mixing homozygous DNAs before PCR, for a total of six (AC)n repeats located on human chromosome 11p15. To investigate the utility of our approach, a large population sample of 405 unrelated individuals was genotyped for each (AC)n repeat using minor bands as internal quality controls. Genotype frequencies at each of the six loci were in close agreement with Hardy-Weinberg proportions, which suggests that there were few genotyping errors. Our observations add to the evidence indicating that minor bands in native gels are of diagnostic value in the genotyping of dinucleotide repeats.
S Rodríguez; G Visedo; C Zapata
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Electrophoresis     Volume:  22     ISSN:  0173-0835     ISO Abbreviation:  Electrophoresis     Publication Date:  2001 Aug 
Date Detail:
Created Date:  2001-09-06     Completed Date:  2002-01-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8204476     Medline TA:  Electrophoresis     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  2656-64     Citation Subset:  IM    
Departamento de Biología Fundamental, Universidad de Santiago, Santiago de Compostela, Spain.
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MeSH Terms
Acrylic Resins
Chromosomes, Human, Pair 11*
DNA / analysis*
Dinucleotide Repeats*
Electrophoresis, Polyacrylamide Gel / methods
Nucleic Acid Denaturation
Nucleic Acid Heteroduplexes
Polymerase Chain Reaction / methods
Reg. No./Substance:
0/Acrylic Resins; 0/Nucleic Acid Heteroduplexes; 0/polyacrylamide gels; 9007-49-2/DNA

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