Cited by 65Forensic and Genetic ResearchGenetic diversity and population structureGenetic Associations and Epidemiology

SNPs as Supplements in Simple Kinship Analysis or as Core Markers in Distant Pairwise Relationship Tests: When Do SNPs Add Value or Replace Well-Established and Powerful STR Tests?

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Phillips, Christopher, García-Magariños, Manuel, Salas, Antonio, Carracedo, Ángel, Lareu, Maria Victoria·2012·Transfusion Medicine and Hemotherapy

Abstract

BACKGROUND: Genetic tests for kinship testing routinely reach likelihoods that provide virtual proof of the claimed relationship by typing microsatellites-commonly consisting of 12-15 standard forensic short tandem repeats (STRs). Single nucleotide polymorphisms (SNPs) have also been applied to kinship testing but these binary markers are required in greater numbers than multiple-allele STRs. However SNPs offer certain advantageous characteristics not found in STRs, including, much higher mutational stability, good performance typing highly degraded DNA, and the ability to be readily up-scaled to very high marker numbers reaching over a million loci. This article outlines kinship testing applications where SNPs markedly improve the genetic data obtained. In particular we explore the minimum number of SNPs that will be required to confirm pairwise relationship claims in deficient pedigrees that typify missing persons' identification or war grave investigations where commonly few surviving relatives are available for comparison and the DNA is highly degraded. METHODS: We describe the application of SNPs alongside STRs when incomplete profiles or allelic instability in STRs create ambiguous results, we review the use of high density SNP arrays when the relationship claim is very distant, and we outline simulations of kinship analyses with STRs supplemented with SNPs in order to estimate the practical limit of pairwise relationships that can be differentiated from random unrelated pairs from the same population. RESULTS: The minimum number of SNPs for robust statistical inference of parent-offspring relationships through to those of second cousins (S-3-3) is estimated for both simple, single multiplex SNP sets and for subsets of million-SNP arrays. CONCLUSIONS: There is considerable scope for resolving ambiguous STR results and for improving the statistical power of kinship analysis by adding small-scale SNP sets but where the pedigree is deficient the pairwise relationships must be relatively close. For more distant relationships it is possible to reduce chip-based SNP arrays from the million+ markers down to ∼7,000. However, such numbers indicate that current genotyping approaches will not be able to deliver sufficient data to resolve distant pairwise relationships from the limited DNA typical of the most challenging identification cases.

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Crossref · 10.1159/000338857

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  • The autosomal DNA proportion shared with a given ancestor halves with every interject generation, so autosomal DNA testing for genealogical purposes is limited to investigating family relationships within the last five or six generations; beyond that, genetic segments become too small and eventually disappear due to chance.

    “The autosomal DNA proportion shared with a given ancestor, in theory, halves with every interject generation.Thus, autosomal DNA testing for genealogical purposes is limited to investigate family relationships within the last five or six generations.Beyond that, genetic segments become too small and eventually disappear due to chance [15].”

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Authors
Phillips, C., García-Magariños, M., Salas, A., Carracedo, Á., & Lareu, M. V.
Affiliations
Universidade de Santiago de Compostela (ES)
Venue
Transfusion Medicine and Hemotherapy
Publisher
S. Karger AG
Published
2012
Volume
39
Issue
3
Pages
202-210
ISSN
  • 1660-3796 (ISSN-L)
  • 1660-3818
OpenAlex
W1967454538
Cited by
65
References
17
Citations by year
2026: 6 · 2025: 4 · 2024: 5 · 2023: 4 · 2022: 3 · 2021: 2 · 2020: 5 · 2019: 4 · 2018: 3 · 2017: 4 · 2016: 8 · 2015: 6 · 2014: 5 · 2013: 5 · 2012: 1
FWCI
3.28
Type
journal article
Language
en
Open access
Locations
  • Transfusion Medicine and Hemotherapy (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Ministerio de Ciencia e Innovación (SAF2008-02971, MTM2008-00166)
  • Xunta de Galicia (INCITE 09 208163PR, MTM2008-00166)
  • European Regional Development Fund
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Forensic and Genetic Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
Keywords
kinship testing, single nucleotide polymorphisms, microsatellite markers, SNP array, degraded DNA, missing persons identification, parent-offspring relationships, statistical power, genotyping

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