PreprintCited by 22Genetic and phenotypic traits in livestockGenomics and Phylogenetic StudiesGenetic Mapping and Diversity in Plants and Animals

Taurine pangenome uncovers a segmental duplication upstream of KIT associated with depigmentation in white-headed cattle

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Milia, Sotiria, Leonard, Alexander S., Mapel, Xena Marie, Bernal Ulloa, Sandra Milena, Drögemüller, Cord, Pausch, Hubert·2025·Genome Research

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Abstract

Cattle have been selectively bred for coat color, spotting, and depigmentation patterns. The assumed autosomal dominant inherited genetic variants underlying the characteristic white head of Fleckvieh, Simmental, and Hereford cattle have not been identified yet, although the contribution of structural variation upstream of the KIT gene has been proposed. Here, we construct a graph pangenome from 24 haplotype assemblies representing seven taurine cattle breeds to identify and characterize the white-head-associated locus for the first time based on long-read sequencing data and pangenome analyses. We introduce a pangenome-wide association mapping approach that examines assembly path similarities within the graph to reveal an association between two most likely serial alleles of a complex structural variant (SV) 66 kb upstream of KIT and facial depigmentation. The complex SV contains a variable number of tandemly duplicated 14.3 kb repeats, consisting of LTRs, LINEs, and other repetitive elements, leading to misleading alignments of short and long reads when using a linear reference. We align 250 short-read sequencing samples spanning 15 cattle breeds to the pangenome graph, further validating that the alleles of the SV segregate with head depigmentation. We estimate an increased count of repeats in Hereford relative to Simmental and other white-headed cattle breeds from the graph alignment coverage, suggesting a large under-assembly in the current Hereford-based cattle reference genome, which had fewer copies. Our work shows that exploiting assembly path similarities within graph pangenomes can reveal trait-associated complex SVs.

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  • A complex SV situated 66 kb upstream of the KIT gene, a variable number of tandemly duplicated 14.3 kb repeats, has been identified as the causal mutation for the white-head phenotype.

    “A striking example is the complex SV situated 66 kb upstream of the KIT gene: a variable number of tandemly duplicated 14.3 kb repeats has been identified as the causal mutation for the white-head phenotype, a trait whose heritability was previously difficult to pinpoint using standard SNP arrays [187].”

    From The Genomic Landscape of Cattle: Domestication, Dispersal, and Adaptive Evolution (2026) · cites this paper as [187]

    The Results (pages unavailable in our copy) locate the complex SV 66 kb upstream of KIT and describe a variable number of 14.3 kb duplication units in white-headed cattle. The Discussion calls it a promising SV associated with the phenotype and treats its functional mechanism as speculative, so the claim that it was identified as the causal mutation overstates the evidence. The paper discusses earlier mapping difficulties but does not establish the sentence’s specific claim about standard SNP arrays. (LLM, conf=0.88)

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Authors
Milia, S., Leonard, A. S., Mapel, X. M., Bernal Ulloa, S. M., Drögemüller, C., & Pausch, H.
Affiliations
  • ETH Zurich (CH)
  • Animal Physiology, ETH Zurich, Zurich 8092, Switzerland;
  • University of Bern (CH)
Corresponding author
Pausch, Hubert
Venue
Genome Research
Published
2024-12-18
Volume
35
Issue
4
Pages
1041-1052
ISSN
  • 1088-9051 (ISSN-L)
  • 1549-5469
OpenAlex
W4405536335
Cited by
22
References
87
Citations by year
2026: 9 · 2025: 8 · 2024: 5
Type
posted content
Language
en
Open access
Licence
cc-by-nc
Locations
  • Genome Research (publishedVersion, cc-by-nc)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc)
Funders
Swiss National Science Foundation (SNSF (204654)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and phenotypic traits in livestock
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Mapping and Diversity in Plants and Animals
Keywords
KIT gene, segmental duplication, structural variants, repetitive elements, lines, coat color inheritance
MeSH terms
Animals, Cattle, Hair Color, Haplotypes, Genome, Proto-Oncogene Proteins c-kit, Genome-Wide Association Study, Segmental Duplications, Genomic

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