Discriminating between allele- and genotype-specific transmission ratio distortion.

Publisher: Wiley-Blackwell Country of Publication: England NLM ID: 8605704 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1365-2052 (Electronic) Linking ISSN: 02689146 NLM ISO Abbreviation: Anim Genet Subsets: MEDLINE

Publication: Oxford, England : Wiley-Blackwell
Original Publication: Oxford, England : Published by Blackwell Scientific Publications for the International Society for Animal Blood Group Research, c1986-

Alleles* ; Genotype* ; Inheritance Patterns* ; Models, Genetic*; Animals ; Cattle ; Female ; Heterozygote ; Male

Transmission ratio distortion (TRD) is defined as the observed deviation from the expected Mendelian inheritance of alleles from heterozygous parents. This phenomenon is attributed to various biological mechanisms acting on germ cells, embryos or fetuses, or even in early postnatal life. Current statistical approaches typically use two independent parametrizations assuming that TRD relies on allele- or genotype-related mechanisms, although they have never been tested and compared. This study compared allele- and genotype-related TRD models on simulated datasets with 1000 genotyped offspring and real data from 168 sire-dam-offspring beef cattle trios. The analysis of simulated datasets favored the true model of analysis in most cases (>93%), and a low percentage of missidentification occurred under (almost) null dominance (genotype-related model) or similar and moderate-to-low sire- and dam-specific TRD parameters (allele-related model). Moreover, the correlation between simulated and predicted distortion parameters was high (>0.97) under the true model. The comparison of allele- and genotype-related TRD models is an appealing tool to infer the biological source of TRD (i.e. haploid vs. diploid cells) when screening the whole genome. The analysis of beef cattle data corroborated a TRD region previously reported in chromosome 4, although discarding allele-related mechanisms and favoring the genotype-related model as the more reliable one. The results of this study highlight the relevance of implementing and comparing different parametrizations to capture all kinds of TRD, and to compare them using appropriate statistical methods.
(© 2020 Stichting International Foundation for Animal Genetics.)

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Keywords: Bayesian inference; Mendelian inheritance; beef cattle; heterozygote parents; model comparison

Date Created: 20200930 Date Completed: 20210323 Latest Revision: 20210323

20221213

10.1111/age.13007

32996622