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Related Concept Videos

Epistasis Analysis01:09

Epistasis Analysis

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Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
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Epistasis01:39

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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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Statistical tests can calculate whether there is a relationship, or correlation, between independent and dependent variables. An indirect relationship of the variables signifies a correlation, while a direct relationship shows causation. If it is determined that no connection exists between the variables, then the correlation is a coincidence.
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Background and Environment Affect Phenotype02:27

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Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
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Related Experiment Video

Updated: Apr 28, 2026

Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes
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Additional Evidence Fails to Associate Variation in KCNE4 With Equine Anhidrosis.

Jessica L Petersen1, Carrie J Finno2

  • 1Department of Animal Science, University of Nebraska-Lincoln, Lincoln, Nebraska, USA.

Animal Genetics
|April 26, 2026
PubMed
Summary
This summary is machine-generated.

This study found no association between the KCNE4 gene variant or a specific GWA SNV and equine anhidrosis in Thoroughbreds. These findings do not support their role in the condition, impacting equine genetics research.

Keywords:
genetic testinggenome‐wide associationhorselinkage disequilibriumreplicationsweat

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Area of Science:

  • Equine genetics
  • Animal genomics
  • Veterinary medicine

Background:

  • Previous genome-wide association studies suggested chromosome 6 and a KCNE4 variant are linked to equine anhidrosis.
  • Conflicting reports emerged regarding the specific risk allele (G vs. A) within the KCNE4 gene.

Purpose of the Study:

  • To re-evaluate the association of the KCNE4 variant (NC_009149.3:g.11813731A>G) and a GWA single nucleotide variant (SNV) with equine anhidrosis.
  • To clarify the genetic basis of anhidrosis in horses, particularly Thoroughbreds.

Main Methods:

  • Genotyping of the KCNE4 variant in horses phenotyped using an intradermal terbutaline sweat test (ITST).
  • Analysis of linkage disequilibrium (LD) between the KCNE4 variant and the GWA SNV using whole-genome sequence and public data.
  • Re-analysis of prior GWA data in Thoroughbreds.

Main Results:

  • No significant association was found between the KCNE4 A allele and equine anhidrosis, regardless of disease severity (partial/complete).
  • Linkage disequilibrium between the KCNE4 locus and the GWA SNV was low in broader populations but higher in Thoroughbreds.
  • Re-analysis of original GWA data in Thoroughbreds revealed no association of chromosome 6 with anhidrosis.

Conclusions:

  • The KCNE4 missense variant and the previously implicated GWA SNV are not supported as causal or risk factors for equine anhidrosis.
  • Further research is needed to identify the genetic underpinnings of equine anhidrosis.