OMIA:000201-10007 : Coat colour, agouti in Sciurus aberti (tassel-eared squirrel)

In other species: Tasmanian devil , gray wolf , coyote , dog , red fox , domestic cat , leopard , ass (donkey) , horse , pig , Arabian camel , llama , Western roe deer , impala , taurine cattle , goat , sheep , rabbit , North American deer mouse , Mongolian gerbil , meadow voles , domestic guinea pig , alpaca , leopard cat , oldfield mouse , Kodkod , Colocolo , Asiatic golden cat , Northern mole vole , Eurasian water mole

Categories: Pigmentation phene

Links to possible relevant human trait(s) and/or gene(s) in OMIM: 611742 (trait) , 600201 (gene)

Mendelian trait/disorder: yes

Considered a defect: no

Key variant known: yes

Year key variant first reported: 2024

Cross-species summary: This locus, ASIP, encodes the agouti signalling protein, a peptide antagonist of the melanocyte-stimulating hormone receptor (MC1R), which is the product of the extension locus. As explained by Schneider et al. (PLoS Genet 10(2): e1004892; 2015), "The most common causes of melanism (black coat) mutations are gain-of-function alterations in MC1R, or loss-of function alterations in ASIP, which encodes Agouti signaling protein, a paracrine signaling molecule that inhibits MC1R signaling".

Molecular basis: Barrett et al. (2024) "sequenced the MC1R and ASIP genes for five wild-type and seven melanistic S. aberti individuals to search for melanism-associated mutations. A novel single base pair mutation in the ASIP gene [c.370T>C; p.(C124R)], unique to S. aberti, was found to be associated with melanism in the species ... .

Associated gene:

Symbol Description Species Chr Location OMIA gene details page Other Links
ASIP Sciurus aberti - no genomic information (-..-) ASIP Ensembl


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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
1666 Coat colour, black ASIP missense Naturally occurring variant c.370T>C p.(C124R) 2024 38396615

Cite this entry

Nicholas, F. W., Tammen, I., & Sydney Informatics Hub. (2024). OMIA:000201-10007: Online Mendelian Inheritance in Animals (OMIA) [dataset].


2024 Barrett, L.H., Fraga, D., Lehtinen, R.M. :
The genetic basis of melanism in Abert's squirrel (Sciurus aberti). Animals (Basel) 14:648, 2024. Pubmed reference: 38396615. DOI: 10.3390/ani14040648.

Edit History

  • Created by Imke Tammen2 on 28 Feb 2024