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The immunogenomic landscape of cattle

Li, T.; Xia, T.; Wu, J.; Hong, H.; Sun, Z.; Wang, M.; Ding, F.; Wang, J.; Jiang, S.; Li, J.; Pan, J.; Yang, G.; Feng, J.; Dai, Y.; Zhang, X.; Zhou, T.; Li, T.

2022-06-01 genomics
10.1101/2022.05.31.493931 bioRxiv
Show abstract

Here, we report the de novo assembly of a cattle genome using ultra-long-read nanopore sequencing in conjunction with other advanced technologies. The assembled genome contains only 145 contigs (N50 [~] 74.0 Mb). Compare to the current reference cattle genome ARS-UCD1.2, 154 gaps are closed, and 467 scaffolds are further placed in our assembly. Importantly, except two remained gaps in the T-cell receptor /{delta} (TRA/TRD) region, the gene loci of other TRs and immunoglobulins (IGs) are seamlessly assembled and exquisitely annotated. With the characterization of 258 IG genes and 626 TR genes that distributed in seven genomic loci, we illustrate the highest immune gene diversity in mammals to our knowledge. Moreover, the gene structures of major histocompatibility complex (MHC) are integrally depicted with properly phased haplotypes. Thus, our work not only reports a cattle genome with the most continuity and completeness, but also provide a comprehensive view of the complex immune- genome.

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