Highlights
- •Allele frequencies of common STR loci for 94 populations in China were obtained.
- •The population-specific and locus-specific FST values were calculated.
- •The FST correction could make the calculated LRs more accurate and reasonable.
Abstract
The proper assessment of DNA evidence in cases of personal identification is a recurring
theme in forensics. It is common practice to evaluate the strength of DNA evidence
using the likelihood ratio (LR). The accurate use of population allele frequencies
is a crucial problem in LR calculation. Allele frequency differences among different
populations could be estimated by the FST values. Thus, FST would also affect LR values by correcting the allele frequencies. In this study,
Chinese population allele frequency data were selected from population reports published
in Chinese and English journals. The population-specific FST values of each population, the overall FST values of each province, each region, and the whole country, and the locus-specific
FST values of different loci were calculated. The LRs using different allele frequencies
and different FST values were compared based on the combination of simulated genotypes. As a result,
the FST values of 94 populations, 19 provinces, 7 regions, and the whole country were obtained.
The LR was overestimated using allele frequencies of the combined population containing
multiple populations rather than using allele frequencies of a population, and the
LRs after FST correction were lower than those without correction. Conclusively, the correction
in conjunction with corresponding FST values can make the LRs more accurate and reasonable.
Keywords
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Article info
Publication history
Published online: March 03, 2023
Accepted:
March 2,
2023
Received in revised form:
February 14,
2023
Received:
November 28,
2022
Identification
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