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A Practical Guide to Phylogenetics for Nonexperts
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Pairwise kinship inference and pedigree reconstruction using 91 microhaplotypes.

Yifan Wei1, Qiang Zhu1, Haoyu Wang1

  • 1West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, China.

Forensic Science International. Genetics
|July 5, 2024
PubMed
Summary

This study introduces a novel method for kinship inference using 91 microhaplotypes, successfully distinguishing relatives even without prior assumptions. The approach enables accurate pedigree reconstruction for closely related individuals with unknown relationships.

Keywords:
KinshipLikelihood ratio (LR)Microhaplotypes (MH)PedigreeRelatedness

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Area of Science:

  • Forensic Genetics
  • Population Genetics
  • Bioinformatics

Background:

  • Kinship inference is a critical challenge in forensic genetics, particularly when relationships are unknown and no prior hypotheses exist.
  • Accurate determination of familial relationships is essential for legal and genealogical investigations.

Purpose of the Study:

  • To develop and validate a method for kinship inference and pedigree reconstruction using microhaplotypes without prior relationship assumptions.
  • To assess the efficacy of 91 microhaplotypes in distinguishing various degrees of relatedness and reconstructing unknown pedigrees.

Main Methods:

  • Genotyping of 46 pedigree samples using 91 microhaplotypes via massive parallel sequencing.
  • Kinship inference through likelihood ratio (LR) calculations on simulated and real data.
  • Pedigree reconstruction using pedigree likelihoods, with and without relationship assumptions.

Main Results:

  • The 91 microhaplotypes effectively discriminated second-degree relatives from unrelated individuals.
  • Higher polymorphic loci or expanded LR searches were needed for more distant relationships.
  • Successful reconstruction of pedigrees for closely related individuals with unknown relationships was achieved.

Conclusions:

  • The study provides a robust solution for kinship inference in scenarios lacking prior assumptions.
  • Microhaplotype analysis offers a powerful tool for pedigree reconstruction in complex familial investigations.
  • This method enhances the capabilities of forensic genetics in resolving unknown familial connections.