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Exploring the potential genetic heterogeneity in the incidence of hoof and leg disorders in Austrian Fleckvieh and Braunvieh cattle

Barbara Kosinska-Selbi, Tomasz Suchocki, Christa Egger-Danner, Hermann Schwarzenbacher, Magdalena Fraszczak, Joanna Szyda
doi: https://doi.org/10.1101/2020.01.11.902767
Barbara Kosinska-Selbi
1Biostatistic Group, Department of Genetics, Wroclaw University of Environmental and Life Sciences, Kozuchowska 7, 51-631 Wroclaw, Poland
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Tomasz Suchocki
1Biostatistic Group, Department of Genetics, Wroclaw University of Environmental and Life Sciences, Kozuchowska 7, 51-631 Wroclaw, Poland
2National Research Institute of Animal Production, Krakowska 1, 32-083 Balice, Poland
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Christa Egger-Danner
3ZuchtData EDV-Dienstleistungen GmbH, Dresdner Straße 89/19, 1200 Vienna, Austria
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Hermann Schwarzenbacher
3ZuchtData EDV-Dienstleistungen GmbH, Dresdner Straße 89/19, 1200 Vienna, Austria
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Magdalena Fraszczak
1Biostatistic Group, Department of Genetics, Wroclaw University of Environmental and Life Sciences, Kozuchowska 7, 51-631 Wroclaw, Poland
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Joanna Szyda
1Biostatistic Group, Department of Genetics, Wroclaw University of Environmental and Life Sciences, Kozuchowska 7, 51-631 Wroclaw, Poland
2National Research Institute of Animal Production, Krakowska 1, 32-083 Balice, Poland
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  • For correspondence: joanna.szyda@upwr.edu.pl
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Abstract

Background Genetic heterogeneity denotes the situation when different genetic architectures underlying diverse populations result in the same phenotype. In this study, we explore the nature of differences in the incidence of the number of hoof and leg disorders between Braunvieh and Fleckvieh cattle in the context of genetic heterogeneity between the breeds.

Results Despite potentially higher power of testing due to twice as large sample size, none of the SNPs was significantly associated with the number of hoof and leg disorders in Fleckvieh, while 16 SNPs were significant in Braunvieh. The most promising candidate genes in Braunvieh are: CBLB on BTA01, which causes arthritis in rats; CAV2 on BTA04, which in effects mouse skeletal muscles; PTHLH on BTA05, which causes disease phenotypes related to the skeleton in humans, mice and zebrafish; SORCS2 on BTA06, which causes decreased susceptibility to injury in the mouse. Some of the significant SNPs (BTA01, BTA04, BTA05, BTA13, BTA16) reveal allelic heterogeneity – i.e. differences due to different allele frequencies between Fleckvieh and Braunvieh. Some of the significant regions (BTA01, BTA05, BTA13, BTA16) correlate to inter-breed differences in LD structure and may thus represent false-positive heterogeneity. However, positions on BTA06 (SORCS2), BTA14 and BTA24 mark Braunvieh-specific regions.

Conclusions We hypothesise that the observed genetic heterogeneity of hoof and leg disorders is a by-product of multigenerational differential selection of the breeds – towards dairy production in the case of Braunvieh and towards beef production in the case of Fleckvieh. Based on the current data set it is no possibly to unequivocally confirm/exclude the hypothesis of genetic heterogeneity in the susceptibility to leg disorders between Fleckvieh and Braunvieh because only explore it through associations and not the causal mutations. Rationales against genetic heterogeneity comprise a limited power of detection of true associations as well as differences in the length of LD blocks and in linkage phase between breeds. On the other hand, multigenerational differential selection of the breeds and no systematic differences in LD structure between the breeds favour the heterogeneity hypothesis at some of the significant sites.

Footnotes

  • http://theta.edu.pl/wp-content/uploads/2019/08/EAAP_2019_BKS_MF_TS_Ch_ED_H_Sch.pdf

  • List of abbreviations

    BSW
    Braunvieh
    FDR
    false discovery rate
    FLV
    Fleckvieh
    GWAS
    genome-wide association study
    LD
    linkage disequilibrium
    PCA
    principal component analysis
    SNP
    single nucleotide polymorphism
  • Copyright 
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    Posted January 13, 2020.
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    Exploring the potential genetic heterogeneity in the incidence of hoof and leg disorders in Austrian Fleckvieh and Braunvieh cattle
    Barbara Kosinska-Selbi, Tomasz Suchocki, Christa Egger-Danner, Hermann Schwarzenbacher, Magdalena Fraszczak, Joanna Szyda
    bioRxiv 2020.01.11.902767; doi: https://doi.org/10.1101/2020.01.11.902767
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    Exploring the potential genetic heterogeneity in the incidence of hoof and leg disorders in Austrian Fleckvieh and Braunvieh cattle
    Barbara Kosinska-Selbi, Tomasz Suchocki, Christa Egger-Danner, Hermann Schwarzenbacher, Magdalena Fraszczak, Joanna Szyda
    bioRxiv 2020.01.11.902767; doi: https://doi.org/10.1101/2020.01.11.902767

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