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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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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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Breed, Coat Color, and Hair Length as Risk Factors for Hyperthyroidism in Cats.

V J Crossley1, A Debnath1, Y M Chang2

  • 1Department of Clinical Science and Services, Royal Veterinary College, University of London, London, UK.

Journal of Veterinary Internal Medicine
|June 15, 2017
PubMed
Summary
This summary is machine-generated.

Certain cat breeds like Burmese and Siamese have a lower risk of hyperthyroidism. Longhaired, nonpurebred cats face an increased risk, highlighting the link between coat type and feline hyperthyroidism.

Keywords:
CatPigmentTyrosinaseTyrosine

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Area of Science:

  • Veterinary Medicine
  • Feline Health
  • Epidemiology

Background:

  • Hyperthyroidism is a common endocrine disorder in older cats, with poorly understood causes.
  • A potential link between coat pigmentation and reduced hyperthyroidism risk in specific breeds has been hypothesized but not extensively studied.

Purpose of the Study:

  • To investigate the association between coat phenotype (breed, color, hair length) and the risk of hyperthyroidism in cats.
  • To identify specific breeds and coat characteristics that may confer protection or increased susceptibility to feline hyperthyroidism.

Main Methods:

  • A retrospective, cross-sectional epidemiological study was conducted on 4,705 cats aged 10 years or older.
  • Bayesian multivariable logistic regression analysis was used to assess risk factors for hyperthyroidism.

Main Results:

  • Specific breeds including Burmese, Tonkinese, Persian, Siamese, Abyssinian, and British Shorthair showed a significantly decreased risk of hyperthyroidism compared to domestic shorthairs.
  • Longhaired, nonpurebred cats exhibited an increased risk of hyperthyroidism.
  • No association was found between coat color/pattern and hyperthyroidism in nonpurebred cats.

Conclusions:

  • The study confirms a decreased risk of hyperthyroidism in several specific breeds and identifies hair length as a significant factor.
  • Further research is recommended to elucidate the mechanisms behind these observed associations between coat phenotype and feline hyperthyroidism.