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Genome-wide runs of homozygosity signatures in diverse Indian goat breeds

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Abstract

The present study analyzed ROH and consensus ROH regions in 102 animals of eleven diverse Indian goat (Capra hircus) breeds using whole genome sequencing. A total of 51,705 ROH and 21,271 consensus regions were identified. The mean number of ROH per animal was highest in the meat breed, Jharkhand Black (2693) and lowest in the pashmina breed, Changthangi (60). The average length of ROH (ALROH) was maximum in Kanniadu (974.11 Kb) and minimum in Tellicherry (146.98 Kb). Long ROH is typically associated with more recent inbreeding, whereas short ROH is connected to more ancient inbreeding. The overall ROH-based genomic inbreeding (FROH) was highest for Jharkhand Black (0.602) followed by Kanniadu (0.120) and Sangamneri (0.108) among all breeds. FROH of Jharkhand Black was higher than Kanniadu  up to 5 Mb ROH length category. However, in > 20 Mb ROH length category, Kanniadu (0.98)  exhibited significantly higher FROH than Jharkhand Black (0.46). This  implies that Kanniadu had higher levels of recent inbreeding than Jharkhand Black. Despite this, due to the presence of both recent and ancient inbreeding, Jharkhand Black  demonstrated higher overall FROH compared to Kanniadu. ROH patterns revealed dual purpose (meat and dairy) and pashmina breeds as less consanguineous while recent inbreeding was apparent in meat breeds. Analysis of ROH consensus regions identified selection sweeps in key genes governing intramuscular fat deposition, meat tenderisation, lean meat production and carcass weight (CDK4, ALOX15, CASP9, PRDM16, DVL1) in meat breeds; milk fat percentage and mammary gland development (POLD1, NOTCH2, ARHGAP35) in dual purpose (meat and dairy) breeds; while cold adaptation and hair follicle development (APOBEC1, DNAJC3, F2RL1, FGF9) in pashmina breed. MAPK, RAS, BMP and Wnt signaling pathways associated with hair follicle morphogenesis in Changthangi were also identified. PCA analysis based on ROH consensus regions revealed that meat breeds are more diverse than other goat breeds/populations.

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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The Authors are thankful to the Director, ICAR-NBAGR, Karnal, Incharges of various livestock farms and Veterinary Officers of the State Animal Husbandry Department for providing the necessary facilities/blood sample collection for the research work. The authors acknowledge the funding support received from the ICAR-National Bureau of Animal Genetic Resources, Karnal for the institute project (project code 7.75).

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SB: Investigation, Methodology, Software, IG: Conceptualization, Visualization, Investigation. Supervision, draft preparation, editing, SS: Investigation, Supervision, AKB: Script writing, Software and SPD: Conceptualization, Reviewing and Editing. All the authors have read and approved the final manuscript.

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Correspondence to Indrajit Ganguly or S. P. Dixit.

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The authors declare no conflict of interest.

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Random blood samples were obtained from the goats with written informed consent from the owner by qualified Veterinarian in accordance with the guidelines issued by the Committee for the Purpose of Control and Supervision of Experiments on Animals (CPCSEA; http://cpcsea.nic.in/WriteReadData/userfiles/file/Compendium%20of%20CPCSEA.pdf) and approved by the Institutional Animal Ethics Committee (IAEC) of ICAR-National Bureau of Animal Genetics Resources (ICAR-NBAGR), Karnal.

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Kar, D., Ganguly, I., Singh, S. et al. Genome-wide runs of homozygosity signatures in diverse Indian goat breeds. 3 Biotech 14, 81 (2024). https://doi.org/10.1007/s13205-024-03921-y

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