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Updated: Jan 6, 2026

Application of DNA Fingerprinting using the D1S80 Locus in Lab Classes

Application of DNA Fingerprinting using the D1S80 Locus in Lab Classes

Published on: July 17, 2021

Sequence features of forensic core short tandem repeat loci.

Lei Miao^1,2, Ke-Lai Kang¹, Chi Zhang¹

¹Key Laboratory of Forensic Genetics of Ministry of Public Security, Institute of Forensic Science, Ministry of Public Security, Beijing 100038, China.

Yi Chuan = Hereditas

|November 18, 2025

Summary

Short tandem repeat (STR) sequence analysis reveals crucial genetic variations beyond length, enhancing forensic DNA identification. Next-generation sequencing provides deeper insights into STR polymorphisms for improved accuracy in criminal investigations and kinship analysis.

Keywords:

autosomal chromosome forensic genetics sequence-based polymorphism short tandem repeat

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Enhanced Genetic Analysis of Single Human Bioparticles Recovered by Simplified Micromanipulation from Forensic ‘Touch DNA’ Evidence

Enhanced Genetic Analysis of Single Human Bioparticles Recovered by Simplified Micromanipulation from Forensic ‘Touch DNA’ Evidence

Published on: March 9, 2015

Area of Science:

Forensic Genetics
Molecular Biology
Population Genetics

Background:

Short tandem repeats (STRs) are key genetic markers for forensic DNA identification, with existing databases primarily based on length polymorphisms.
Traditional capillary electrophoresis methods only detect length variations, missing critical sequence-based polymorphisms in repeat and flanking regions.
Sequence variations in STR primer binding sites can compromise genotyping accuracy, leading to allele dropout and reduced identification efficiency.

Purpose of the Study:

To systematically review sequence polymorphisms of 19 autosomal core STR loci using population data.
To summarize repeat region variations and analyze their patterns.
To present high-frequency flanking region variations in the Chinese population and discuss challenges in STR sequence analysis.

Main Methods:

Literature review focusing on sequence-based polymorphisms of core STR loci.
Analysis of population data to identify variations in repeat and flanking regions.
Synthesis of findings to provide a comprehensive overview of STR sequence characteristics.

Main Results:

Identified and summarized sequence variations within the repeat regions of 19 autosomal core STRs.
Analyzed patterns of sequence variation across different STR loci.
Documented high-frequency sequence variations in flanking regions specific to the Chinese population.

Conclusions:

A comprehensive understanding of STR sequence polymorphisms is vital for accurate individual identification, especially from trace DNA and mixed samples.
Next-generation sequencing technology significantly enhances the polymorphic information obtainable from STR loci, improving identification efficiency.
This review provides a valuable reference for STR sequence analysis, rare allele identification, and the development of advanced STR genotyping panels.