pig; pigs; swine; wild boar; Sus scrofa Linnaeus, 1758; Sus scrofus
Show more ... ebrata; Gnathostomata; Teleostomi; Euteleostomi; Sarcopterygii; Dipnotetrapodomorpha; Tetrapoda; Amniota; Mammalia; Theria; Eutheria; Boreoeutheria; Laurasiatheria; Cetartiodactyla; Suina; Suidae; Sus
NCBI Taxonomy ID
is Taxon A an Infraspecies?
Sus domestica; Sus domesticus; Sus scrofa domestica; domestic pig
Show more ... hostomata; Teleostomi; Euteleostomi; Sarcopterygii; Dipnotetrapodomorpha; Tetrapoda; Amniota; Mammalia; Theria; Eutheria; Boreoeutheria; Laurasiatheria; Cetartiodactyla; Suina; Suidae; Sus; Sus scrofa
NCBI Taxonomy ID
is Taxon B an Infraspecies?
Generic Gene Name
CMM5; MSH-R; SHEP2; MSHR
Belongs to the G-protein coupled receptor 1 family.
GO - Molecular Function
GO:0008528 : G protein-coupled peptide receptor activity ... show more
GO - Biological Process
GO:0007275 : multicellular organism development ... show more
GO - Cellular Component
GO:0005886 : plasma membrane ... show more
Molecular Details of the Mutation
2bp insertion at 23 generates early stop @ 56 & D"121"N ?
Kijas JM; Moller M; Plastow G; Andersson L
Black spotting on a red or white background in pigs is determined by the E(P) allele at the MC1R/Extension locus. A previous comparison of partial MC1R sequences revealed that E(P) shares a missense mutation (D121N) with the E(D2) allele for dominant black color. Sequence analysis of the entire coding region now reveals a second mutation in the form of a 2-bp insertion at codon 23 (nt67insCC). This mutation expands a tract of six C nucleotides to eight and introduces a premature stop codon at position 56. This frameshift mutation is expected to cause a recessive red color, which was in fact observed in some breeds with the E(P) allele present (Tamworth and Hereford). RT-PCR analyses were conducted using skin samples taken from both spotted and background areas of spotted pigs. The background red area had transcript only from the mutant nt67insCC MC1R allele, whereas the black spot also contained a transcript without the 2-bp insertion. This indicates that black spots are due to somatic reversion events that restore the frame and MC1R function. The phenotypic expression of the E(P) allele is highly variable and the associated coat color ranges from red, red with black spots, white with black spots, to almost completely solid black. In several breeds of pigs the phenotypic manifestation of this allele has been modified by selection for or against black spots.
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