OMIA:001152-9031 : Feather colour, eumelanin extension in Gallus gallus
Categories: Pigmentation phene
Links to MONDO diseases: No links.
Mendelian trait/disorder: yes
Mode of inheritance: Autosomal incomplete dominant
Considered a defect: no
Key variant known: yes
Year key variant first reported: 2021
Species-specific name: Melanotic
Species-specific symbol: Ml
Species-specific description: Li et al. (2021): "Melanotic affects within-feather pigmentation patterns by enhancing the contrast between dark- and light-colored regions in the feather."
Inheritance: Melanotic shows incomplete dominance over wild-type (Carefoot, 1987)
Mapping: Carefoot (1987) mapped this phene to chicken chromosome 1.
Li et al. (2021) "linkage mapping using a back-cross between Dark Cornish (Ml/Ml) and Partridge Plymouth Rock (ml+/ml+) chickens assigned Ml to an 820-kb region on chromosome 1. Identity-by-descent mapping, via whole-genome sequencing and diagnostic tests using a diverse set of chickens, refined the localization to the genomic region harboring GJA5 encoding gap-junction protein 5 (alias connexin 40) previously associated with pigmentation patterns in zebrafish."
Molecular basis: Li et al. (2021): "An insertion/deletion [InDel1 = 41-bp deletion and 38-bp insertion] polymorphism located in the vicinity of the GJA5 promoter region was identified as the candidate causal mutation. Four different GJA5 transcripts were found to be expressed in feather follicles and at least two showed differential expression between genotypes. The results showed that Melanotic constitutes a cis-acting regulatory mutation affecting GJA5 expression."
|Symbol||Description||Species||Chr||Location||OMIA gene details page||Other Links|
|GJA5||gap junction protein, alpha 5, 40kDa||Gallus gallus||1||NC_052532.1 (92618897..92598058)||GJA5||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||Inferred EVA rsID||Year Published||PubMed ID(s)||Acknowledgements|
|1362||Feather colour, melanotic||GJA5||delins, gross (>20)||Naturally occurring variant||GRCg6a||1||g.95256761_95256801delinsAAACTACTGCTTATTAAACTACTACTACTATTTAAGAT||cis-acting regulatory mutation||2021||34607956|
Cite this entry
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.
|2021||Li, J., Lee, M.O., Chen, J., Davis, B.W., Dorshorst, B.J., Siegel, P.B., Inaba, M., Jiang, T.X., Chuong, C.M., Andersson, L. :|
|Cis-acting mutation affecting GJA5 transcription is underlying the melanotic within-feather pigmentation pattern in chickens. Proc Natl Acad Sci U S A 118:e2109363118, 2021. Pubmed reference: 34607956 . DOI: 10.1073/pnas.2109363118.|
|1990||Carefoot, W.C. :|
|Test for linkage between the eumelanin dilution blue (B1), the extended black (E) allele at the E-locus and the linked pea comb (P) and eumelanin extension (M1) genes in the domestic fowl. British Poultry Science 31:465-472, 1990. Pubmed reference: 2245344 . DOI: 10.1080/00071669008417279.|
|1987||Carefoot, W.C. :|
|Test for linkage between the eumelanin restrictor (Db) and the eumelanin extension (Ml) genes in the domestic fowl British Poultry Science 28:69-73, 1987. Pubmed reference: 3567691 . DOI: 10.1080/00071668708416937.|
|Carefoot, W.C. :|
|Relative positions of the loci of the peacomb (P), eumelanin restrictor (Db), eumelanin extension (Ml) and plumage pattern (Pg) genes of the domestic fowl British Poultry Science 28:347-350, 1987. Pubmed reference: 3607559 . DOI: 10.1080/00071668708416968.|
|1971||Moore, J.W., Smyth, J.R. :|
|Melanotic: key to a phenotypic enigma in the fowl. J Hered 62:215-9, 1971. Pubmed reference: 5137353 . DOI: 10.1093/oxfordjournals.jhered.a108153.|
- Created by Frank Nicholas on 06 Sep 2005
- Changed by Imke Tammen2 on 08 Oct 2021