BCO2 = beta-carotene oxygenase 2
Carotenoid content (yellow serum)
Coding,
SNP
N
Bos taurus
cattle - (species) D
Domesticated
Linkage Mapping
Berry SD; Davis SR; Beattie EM ; et al. (2009)
Mutation in bovine beta-carotene oxygenase 2 affects milk color.
1 Additional References
GP00000138
BCO2
Q9BYV7
Physiology
c.306G>A ; p.W102* N
Bos taurus
cattle - (species)
Bos taurus
cattle - (species) D
BCO2 = beta-carotene oxygenase 2
Bos taurus
cattle - (species)
Published - Accepted by Curator
BCO2 = beta-carotene oxygenase 2
Carotenoid content (skin ; shanks)
Cis-regulatory,
Unknown
Gallus sonneratii
gray junglefowl - (species) D
Gallus gallus
chicken - (species) D
Interspecific
Linkage Mapping
Eriksson J; Larson G; Gunnarsson U ; et al. (2008)
Identification of the yellow skin gene reveals a hybrid origin of the domestic chicken.
1 Additional References
GP00000139
BCO2
Q9BYV7
Morphology; Physiology
Not identified
Gallus gallus
chicken - (species)
Gallus sonneratii
gray junglefowl - (species) D
Gallus gallus
chicken - (species) D
BCO2 = beta-carotene oxygenase 2
Gallus sonneratii
gray junglefowl - (species)
Gallus gallus
chicken - (species)
Published - Accepted by Curator
BCO2 = beta-carotene oxygenase 2
Carotenoid content (yellow fat)
Coding,
SNP
N
Ovis aries
sheep - (species) D
Domesticated
Candidate Gene
Våge DI; Boman IA (2010)
A nonsense mutation in the beta-carotene oxygenase 2 (BCO2) gene is tightly associated with accumula[...]
1 Additional References
GP00000140
BCO2
Q9BYV7
Physiology
g.21947481C>T ; c.196C>T ; p.Q66* N
Ovis aries
sheep - (species)
Ovis aries
sheep - (species) D
BCO2 = beta-carotene oxygenase 2
Ovis aries
sheep - (species)
Published - Accepted by Curator
BCO2 = beta-carotene oxygenase 2
Coloration (coat)
Cis-regulatory,
Unknown
Vermivora cyanoptera
blue-winged warbler - (species)
Interspecific
Association Mapping
Toews DP; Taylor SA; Vallender R ; et al. (2016)
Plumage Genes and Little Else Distinguish the Genomes of Hybridizing Warblers.
GP00001332
BCO2
Q9BYV7
Morphology
unknown - the divergent region falls in the 5prime region that is directly upstream of the associated coding region
Vermivora chrysoptera
Golden-winged warbler - (species)
Vermivora cyanoptera
blue-winged warbler - (species)
BCO2 = beta-carotene oxygenase 2
Vermivora cyanoptera
blue-winged warbler - (species)
Published - Accepted by Curator
BCO2 = beta-carotene oxygenase 2
Carotenoid content (bill, legs)
Coding,
SNP
N
Serinus canaria
common canary - (species) D
Domesticated
Association Mapping
Gazda MA; Toomey MB; Araújo PM ; et al. (2020)
GENETIC BASIS OF DE NOVO APPEARANCE OF CAROTENOID ORNAMENTATION IN BARE-PARTS OF CANARIES.
GP00002039
BCO2
Q9BYV7
Morphology
point mutation at nucleotide position 837,806 that is predicted to be a nonsynonymous mutation in the exon 9 of the BCO2 gene. This variant results in the substitution of a histidine for an arginine at residue 413 of the protein (R413H) . In silico analysis suggests that the R413H could cause structural distortion of the protein and lead to a possible loss of activity. In vitro assays with the urucum BCO2 variant show that the enzyme activity is lost. N
Serinus canaria
common canary - (species)
Serinus canaria
common canary - (species) D
BCO2 = beta-carotene oxygenase 2
Serinus canaria
common canary - (species)
Published - Accepted by Curator
BCO2 = beta-carotene oxygenase 2
Coloration (ventral scales)
Cis-regulatory,
Unknown
Podarcis muralis
Common wall lizard - (species)
Intraspecific
Association Mapping
Andrade P; Pinho C; Pérez I de Lanuza G ; et al. (2019)
Regulatory changes in pterin and carotenoid genes underlie balanced color polymorphisms in the wall [...]
GP00002120
Bco2
Q99NF1
Morphology
Podarcis muralis
Common wall lizard - (species)
Podarcis muralis
Common wall lizard - (species)
BCO2 = beta-carotene oxygenase 2
Podarcis muralis
Common wall lizard - (species)
Published - Accepted by Curator
BCO2 = beta-carotene oxygenase 2
Carotenoid content (sexual dichromatism, male-specific)
Unknown,
Unknown
Serinus canaria
common canary - (species)
Intergeneric or Higher
Linkage Mapping
Gazda MA; Araújo PM; Lopes RJ ; et al. (2020)
A genetic mechanism for sexual dichromatism in birds.
GP00002139
BCO2
Q9BYV7
Morphology
Gene expression study suggests a cis-regulatory difference ; and coding mutations are unlikely to be causal
Spinus cucullatus
red siskin - (species)
Serinus canaria
common canary - (species)
BCO2 = beta-carotene oxygenase 2
Serinus canaria
common canary - (species)
Published - Accepted by Curator
BCO2 = beta-carotene oxygenase 2
Carotenoid content (yellow fat)
Coding,
Deletion
N
Oryctolagus cuniculus
rabbit - (species) D
Domesticated
Candidate Gene
Strychalski J; Brym P; Czarnik U ; et al. (2015)
A novel AAT-deletion mutation in the coding sequence of the BCO2 gene in yellow-fat rabbits.
GP00002152
BCO2
Q9BYV7
Physiology
AAT-deletion mutation at Asp codon 248 of the BCO2 gene located at the beginning of exon 6 which results in the removal of an Asp N
Oryctolagus cuniculus
rabbit - (species)
Oryctolagus cuniculus
rabbit - (species) D
BCO2 = beta-carotene oxygenase 2
Oryctolagus cuniculus
rabbit - (species)
Published - Accepted by Curator
BCO2 = beta-carotene oxygenase 2
Coloration (beak)
Cis-regulatory,
Unknown
Geospiza scandens
(species) D
Geospiza fortis
medium ground-finch - (species) D
Geospiza conirostris
(species) D
Geospiza magnirostris
(species) D
Geospiza fuliginosa
(species) D
Camarhynchus parvulus
(species) D
Camarhynchus pauper
(species) D
Camarhynchus pallidus
woodpecker finch - (species) D
Geospiza difficilis
(species) D
Intraspecific
Association Mapping
Enbody ED; Sprehn CG; Abzhanov A ; et al. (2021)
A multispecies BCO2 beak color polymorphism in the Darwin's finch radiation.
GP00002384
BCO2
Q9BYV7
Morphology
"By closely inspecting this region in a combined sample of all 456 finches of the two species we identified a single exonic SNP with a likelihood ratio test (LRT) statistic exceeding 166 (Figure 1C). It is also the only consistently elevated SNP in an analysis of each species alone (Figure S1), is the best fit variant under a recessive model (STAR Methods), and occurs on multiple haplotypes (Figure S1C). This SNP (chr24:6,166,878; p6166878 hereafter) leads to a synonymous change 32 bp into exon 4 of BCO2. "
"The functional importance of the observed synonymous change is uncertain, and the presence of an unidentified linked causal variant cannot be completely ruled out (see Conclusions). However, a functional explanation is possible because codon usage can be under strong selection30 and may have functional consequences on translation,30 RNA stability,31 and transcription.32 Notably, p6166878 changes the highest frequency valine codon (ƒGTG = 27.3%) to the lowest (ƒGTA = 7.6%) in the reference genome. This is in line with the observed phenotypic effect of the yellow mutation because a lower abundance codon is expected to be associated with lower protein expression.33 In this case, less BCO2 activity results in more carotenoid deposition in the yellow morph. In fact, we found that yellow homozygotes showed significantly lower BCO2 expression compared to pink homozygotes in the upper beak of developing embryos (Figure 1F) that were sourced from a variety of different species and islands (Table S1): small sample sizes prohibit species-specific analysis. Among the six heterozygous individuals, the pink allele was expressed more than the yellow allele in five samples tested using a droplet-digital PCR (Figure S2C). Differences in expression between the two alleles, and in the absence of alternative splice variants (STAR Methods), raise the possibility that the synonymous change alters transcription factor binding affinity in exon 4. Further research into tissue-specific expression and the specific transcription factors that regulate BCO2 is warranted."
Geospiza scandens
(species)
Geospiza fortis
medium ground-finch - (species)
Geospiza conirostris
(species)
Geospiza magnirostris
(species)
Geospiza fuliginosa
(species)
Camarhynchus parvulus
(species)
Camarhynchus pauper
(species)
Camarhynchus pallidus
woodpecker finch - (species)
Geospiza difficilis
(species)
Geospiza scandens
(species) D
Geospiza fortis
medium ground-finch - (species) D
Geospiza conirostris
(species) D
Geospiza magnirostris
(species) D
Geospiza fuliginosa
(species) D
Camarhynchus parvulus
(species) D
Camarhynchus pauper
(species) D
Camarhynchus pallidus
woodpecker finch - (species) D
Geospiza difficilis
(species) D
BCO2 = beta-carotene oxygenase 2
Geospiza scandens
(species)
Geospiza fortis
medium ground-finch - (species)
Geospiza conirostris
(species)
Geospiza magnirostris
(species)
Geospiza fuliginosa
(species)
Camarhynchus parvulus
(species)
Camarhynchus pauper
(species)
Camarhynchus pallidus
woodpecker finch - (species)
Geospiza difficilis
(species)
Published - Accepted by Curator
BCO2 = beta-carotene oxygenase 2
Coloration (feather)
Unknown,
Unknown
Setophaga petechia
yellow warbler - (species) D
Interspecific
Association Mapping
Baiz MD; Wood AW; Brelsford A ; et al. (2021)
Pigmentation Genes Show Evidence of Repeated Divergence and Multiple Bouts of Introgression in Setop[...]
GP00002387
BCO2
Q9BYV7
Morphology
Setophaga pensylvanica
Chestnut-sided warbler - (species)
Setophaga petechia
yellow warbler - (species) D
BCO2 = beta-carotene oxygenase 2
Setophaga petechia
yellow warbler - (species)
Published - Accepted by Curator
BCO2 = beta-carotene oxygenase 2
Coloration (feather)
Unknown,
Unknown
Setophaga citrina
hooded warbler - (species) D
Interspecific
Association Mapping
Baiz MD; Wood AW; Brelsford A ; et al. (2021)
Pigmentation Genes Show Evidence of Repeated Divergence and Multiple Bouts of Introgression in Setop[...]
GP00002388
BCO2
Q9BYV7
Morphology
Setophaga ruticilla
(species)
Setophaga citrina
hooded warbler - (species) D
BCO2 = beta-carotene oxygenase 2
Setophaga citrina
hooded warbler - (species)
Published - Accepted by Curator