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Li A, Yang Q, Li R, Dai X, Cai K, Lei Y, Jia K, Jiang Y, Zan L. Chromosome-level genome assembly for takin (Budorcas taxicolor) provides insights into its taxonomic status and genetic diversity. Mol Ecol 2023; 32:1323-1334. [PMID: 35467052 DOI: 10.1111/mec.16483] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 03/29/2022] [Accepted: 04/17/2022] [Indexed: 11/29/2022]
Abstract
The takin (Budorcas taxicolor) is one of the largest bovid herbivores in the subfamily Caprinae. The takin is at high risk of extinction, but its taxonomic status and genetic diversity remain unclear. In this study, we constructed the first reference genome of Bu. taxicolor using PacBio long High-Fidelity reads and Hi-C technology. The assembled genome is ~2.95 Gb with a contig N50 of 68.05 Mb, which were anchored onto 25+XY chromosomes. We found that the takin was more closely related to muskox than to other Caprinae species. Compared to the common ancestral karyotype of bovidae (2n = 60), we found the takin (2n = 52) experienced four chromosome fusions and one large translocation. Furthermore, we resequenced nine golden takins from the main distribution area, the Qinling Mountains, and identified 3.3 million single nucleotide polymorphisms. The genetic diversity of takin was very low (θπ = 0.00028 and heterozygosity =0.00038), among the lowest detected in domestic and wild mammals. Takin genomes showed a high inbreeding coefficient (FROH =0.217), suggesting severe inbreeding depression. The demographic history showed that the effective population size of takins declined significantly from ~100,000 years ago. Our results provide valuable information for protection of takins and insights into their evolution.
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Affiliation(s)
- Anning Li
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
| | - Qimeng Yang
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China.,Center for Ruminant Genetic and Evolution, Northwest A&F University, Yangling, Shaanxi, China
| | - Ran Li
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China.,Center for Ruminant Genetic and Evolution, Northwest A&F University, Yangling, Shaanxi, China
| | - Xuelei Dai
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China.,Center for Ruminant Genetic and Evolution, Northwest A&F University, Yangling, Shaanxi, China
| | - Keli Cai
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
| | - Yinghu Lei
- Research Center for the Qinling Giant Panda (Shaanxi Rare Wildlife Rescue Base), Shaanxi Academy of Forestry Sciences, Zhouzhi, Shaanxi, China
| | - Kangsheng Jia
- Research Center for the Qinling Giant Panda (Shaanxi Rare Wildlife Rescue Base), Shaanxi Academy of Forestry Sciences, Zhouzhi, Shaanxi, China
| | - Yu Jiang
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China.,Center for Ruminant Genetic and Evolution, Northwest A&F University, Yangling, Shaanxi, China
| | - Linsen Zan
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China.,Research Center for the Qinling Giant Panda (Shaanxi Rare Wildlife Rescue Base), Shaanxi Academy of Forestry Sciences, Zhouzhi, Shaanxi, China
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