OMIA:001249-9685 : Coat colour, brown, TYRP1-related in Felis catus (domestic cat)

In other species: Rhesus monkey , dog , American black bear , horse , pig , taurine cattle , goat , sheep , rabbit , golden hamster , North American deer mouse , Mongolian gerbil , American mink

Categories: Pigmentation phene

Links to possible relevant human trait(s) and/or gene(s) in OMIM: 612271 (trait) , 203290 (trait) , 115501 (gene)

Mendelian trait/disorder: yes

Mode of inheritance: Autosomal

Considered a defect: no

Key variant known: yes

Year key variant first reported: 2005

Inheritance: As summarised by Lyons et al. (2005), "Brown, B, has a suggested allelic series, B > b > b^l. The B allele is normal wild-type black coloration. Cats with the brown variation genotypes, bb or bb^l, are supposedly phenotypically chocolate (aka chestnut) and the light brown genotype, b^lb^l, are supposedly phenotypically cinnamon (aka red)."

Molecular basis: By sequencing a very likely comparative candidate gene (based on the homologous traits in other mammals), Lyons et al. (2005) uncovered the molecular basis for several phenotypes at this locus in cats. The relevant gene is tyrosinase-related protein-1 (TYRP1). Specifically, they showed: "The C to T nonsense mutation at position 298 causes an arginine at amino acid 100 to be replaced by the opal (UGA) stop codon. This mutation is consistent with the cinnamon phenotype and is the putative light brown, b^l, mutation. An intron 6 mutation that potentially disrupts the exon 6 downstream splice-donor recognition site is associated with the chocolate phenotype and is the putative brown, b, mutation." One month later, Schmidt-Küntzel et al. (2005) independently reported the same results.

Associated gene:

Symbol Description Species Chr Location OMIA gene details page Other Links
TYRP1 tyrosinase-related protein 1 Felis catus D4 NC_058380.1 (38129829..38148710) TYRP1 Homologene, Ensembl , NCBI gene


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WARNING! Inclusion of a variant in this table does not automatically mean that it should be used for DNA testing. Anyone contemplating the use of any of these variants for DNA testing should examine critically the relevant evidence (especially in breeds other than the breed in which the variant was first described). If it is decided to proceed, the location and orientation of the variant sequence should be checked very carefully.

Since October 2021, OMIA includes a semiautomated lift-over pipeline to facilitate updates of genomic positions to a recent reference genome position. These changes to genomic positions are not always reflected in the ‘acknowledgements’ or ‘verbal description’ fields in this table.

OMIA Variant ID Breed(s) Variant Phenotype Gene Allele Type of Variant Source of Genetic Variant Reference Sequence Chr. g. or m. c. or n. p. Verbal Description EVA ID Year Published PubMed ID(s) Acknowledgements
306 Cinnamon (light brown) TYRP1 b^l nonsense (stop-gain) Naturally occurring variant Felis_catus_9.0 D4 g.40069161C>T c.298C>T p.(R100*) NM_001042560.2; NP_001036025.2; NM_001042560.2 represents the C allele; Felis_catus_9.0 reference sequence represents the T allele 2005 16104383 Genomic position in Felis_catus_9.0 provided by Leslie Lyons and Reuben Buckley.
379 Chocolate TYRP1 b splicing Naturally occurring variant Felis_catus_9.0 D4 g.40081229G>A c.1261+5G>A p.(A420_D421insX[17^18]) NM_001042560.2; NP_001036025.2; based on Lyons et al. (2005): c.1261+5G>A; based on Schmidt-Küntzel et al. (2005) this splice variant results in c.1261_1262insN[51^54]; p.(A420_D421insX[17^18]) and is inherited together with g.40068871C>G / c.8C>G / p.(A3G) 2005 16104383 Genomic position in Felis_catus_9.0 provided by Leslie Lyons and Reuben Buckley.

Cite this entry

Nicholas, F. W., Tammen, I., & Sydney Informatics Hub. (2024). OMIA:001249-9685: Online Mendelian Inheritance in Animals (OMIA) [dataset].


Note: the references are listed in reverse chronological order (from the most recent year to the earliest year), and alphabetically by first author within a year.

2022 Anderson, H., Davison, S., Lytle, K.M., Honkanen, L., Freyer, J., Mathlin, J., Kyöstilä, K., Inman, L., Louviere, A., Chodroff Foran, R., Forman, O.P., Lohi, H., Donner, J. :
Genetic epidemiology of blood type, disease and trait variants, and genome-wide genetic diversity in over 11,000 domestic cats. PLoS Genet 18:e1009804, 2022. Pubmed reference: 35709088. DOI: 10.1371/journal.pgen.1009804.
2021 Rodney, A.R., Buckley, R.M., Fulton, R.S., Fronick, C., Richmond, T., Helps, C.R., Pantke, P., Trent, D.J., Vernau, K.M., Munday, J.S., Lewin, A.C., Middleton, R., Lyons, L.A., Warren, W.C. :
A domestic cat whole exome sequencing resource for trait discovery. Sci Rep 11:7159, 2021. Pubmed reference: 33785770. DOI: 10.1038/s41598-021-86200-7.
2005 Lyons, LA., Foe, IT., Rah, HC., Grahn, RA. :
Chocolate coated cats: TYRP1 mutations for brown color in domestic cats. Mamm Genome 16:356-66, 2005. Pubmed reference: 16104383.
Schmidt-Küntzel, A., Eizirik, E., O'Brien, S.J., Menotti-Raymond, M. :
Tyrosinase and tyrosinase related protein 1 alleles specify domestic cat coat color phenotypes of the albino and brown loci. J Hered 96:289-301, 2005. Pubmed reference: 15858157. DOI: 10.1093/jhered/esi066.
1963 Todd, N.B. :
Independent assortment of Manx and three coat colour mutants in the domestic cat J Hered 54:266, 1963. Pubmed reference: 14098315. DOI: 10.1093/oxfordjournals.jhered.a107263.

Edit History

  • Created by Frank Nicholas on 26 Nov 2007
  • Changed by Frank Nicholas on 09 Dec 2011
  • Changed by Frank Nicholas on 26 Nov 2012
  • Changed by Imke Tammen2 on 16 Jun 2021
  • Changed by Imke Tammen2 on 21 Jun 2024