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A deletion spanning the promoter and first exon of the hair cycle‐specific ASIP transcript isoform in black and tan rabbits


Letko, A; Ammann, B; Jagannathan, V; Henkel, J; Leuthard, F; Schelling, Claude; Carneiro, M; Drögemüller, C; Leeb, Tosso (2020). A deletion spanning the promoter and first exon of the hair cycle‐specific ASIP transcript isoform in black and tan rabbits. Animal Genetics, 51(1):137-140.

Abstract

Black and tan animals have tan-coloured ventral body surfaces separated by sharp boundaries from black-coloured dorsal body surfaces. In the at mouse mutant, a retroviral 6 kb insertion located in the hair cycle-specific promoter of the murine Asip gene encoding agouti signalling protein causes the black and tan phenotype. In rabbits, three ASIP alleles are thought to exist, including an at allele causing a black and tan coat colour that closely resembles the mouse black and tan phenotype. The goal of our study was to identify the functional genetic variant causing the rabbit at allele. We performed a WGS-based comparative analysis of the ASIP gene in one black and tan and three wt agouti-coloured rabbits. The analysis identified 75 at -associated variants including an 11 kb deletion. The deletion is located in the region of the hair cycle-specific ASIP promoter and thus in a region homologous to the site of the retroviral insertion causing the at allele in mice. We observed perfect association of the genotypes at this deletion with the coat colour phenotype in 49 rabbits. The comparative analysis and the previous knowledge about the regulation of ASIP expression suggest that the 11 kb deletion is the most likely causative variant for the black and tan phenotype in rabbits.

Abstract

Black and tan animals have tan-coloured ventral body surfaces separated by sharp boundaries from black-coloured dorsal body surfaces. In the at mouse mutant, a retroviral 6 kb insertion located in the hair cycle-specific promoter of the murine Asip gene encoding agouti signalling protein causes the black and tan phenotype. In rabbits, three ASIP alleles are thought to exist, including an at allele causing a black and tan coat colour that closely resembles the mouse black and tan phenotype. The goal of our study was to identify the functional genetic variant causing the rabbit at allele. We performed a WGS-based comparative analysis of the ASIP gene in one black and tan and three wt agouti-coloured rabbits. The analysis identified 75 at -associated variants including an 11 kb deletion. The deletion is located in the region of the hair cycle-specific ASIP promoter and thus in a region homologous to the site of the retroviral insertion causing the at allele in mice. We observed perfect association of the genotypes at this deletion with the coat colour phenotype in 49 rabbits. The comparative analysis and the previous knowledge about the regulation of ASIP expression suggest that the 11 kb deletion is the most likely causative variant for the black and tan phenotype in rabbits.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:05 Vetsuisse Faculty > Veterinary Clinic > Department of Farm Animals
05 Vetsuisse Faculty > Center for Clinical Studies
Dewey Decimal Classification:610 Medicine & health
Uncontrolled Keywords:Animal Science and Zoology, Genetics, General Medicine, Oryctolagus cuniculus ; coat colour; non-coding; pigmentation; promoter; structural variant; whole-genome sequence
Language:English
Date:1 February 2020
Deposited On:30 Jan 2020 15:40
Last Modified:30 Jan 2020 15:40
Publisher:Wiley-Blackwell Publishing, Inc.
ISSN:0268-9146
OA Status:Closed
Publisher DOI:https://doi.org/10.1111/age.12881
PubMed ID:31729778

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