Screening of a highly polymorphic microsatellite for microheterogeneity in human identification

Area of Science:

• Molecular Biology
• Human Genetics

Background:

• The human beta-actin-related pseudogene (HUMACTBP2) locus exhibits sequence variations.
• Accurate screening of these variations is crucial for genetic studies.

Purpose of the Study:

• To evaluate single-strand conformation polymorphism (SSCP) analysis with automated laser fluorescence detection for screening HUMACTBP2 sequence variation.
• To assess the method's sensitivity, rapidity, and ability to resolve conformational differences.

Main Methods:

• Utilized SSCP analysis combined with automated laser fluorescence detection.
• Studied eleven sequenced alleles of HUMACTBP2 and fifty ACTBP2 amplification products.
• Employed polymerase chain reaction (PCR)-SSCP subtyping with allelic variants as standards.

Main Results:

• SSCP effectively resolved allelic variants of the same size but different sequence structures based on secondary conformation.
• The method demonstrated ease of interpretation and reproducible conformational patterns.
• Identified polymorphism in length variants and distinguished heterozygous samples that appeared identical on denaturing gels.
• Detected a false homozygous sample as heterozygous for two distinct alleles of the same size.

Conclusions:

• SSCP analysis with automated laser fluorescence detection is a comprehensive, rapid, and sensitive method for screening HUMACTBP2 sequence variation.
• The technique is capable of identifying subtle sequence differences and detecting false homozygotes.
• SSCP complements denaturing gel electrophoresis and DNA sequencing for comprehensive variability studies of the ACTBP2 locus.