青枯病菌,1966年是一种濒临灭绝的淡水鱼,具有经济、生态,和科学价值。考虑到这是唯一具有基因组的Brachymystax物种,因此对B.tsinlingensis基因组的研究可能特别有见地。我们提出了具有Illumina短读数的高质量染色体水平基因组组装和蛋白质编码基因注释。纳米孔长期阅读,Hi-C测序读数,和来自5个组织/器官的RNA-seq读数。最终的染色体水平基因组大小为2,031,709,341bp,具有40条染色体。我们发现鲑鱼有独特的GC含量和密码子使用,进化速度较慢,并拥有特定的阳性选择基因。我们还证实了鲑鱼已经经历了全基因组复制事件和一连串的转座子介导的重复扩增,失去了HoxAbβHox集群,肌肉中高表达的基因可能部分解释了B.tsinlingensis的迁徙习惯。高质量的青枯病菌组装基因组可为其他鲑鱼的研究提供有价值的参考,并有助于该濒危物种的保护。
Brachymystax tsinlingensis Li, 1966 is an endangered freshwater fish with economic, ecological, and scientific values. Study of the genome of B. tsinlingensis might be particularly insightful given that this is the only Brachymystax species with genome. We present a high-quality chromosome-level genome assembly and protein-coding gene annotation for B. tsinlingensis with Illumina short reads, Nanopore long reads, Hi-C sequencing reads, and RNA-seq reads from 5 tissues/organs. The final chromosome-level genome size is 2,031,709,341 bp with 40 chromosomes. We found that the
salmonids have a unique GC content and codon usage, have a slower evolutionary rate, and possess specific positively selected genes. We also confirmed the
salmonids have undergone a whole-genome duplication event and a burst of transposon-mediated repeat expansion, and lost HoxAbβ Hox cluster, highly expressed genes in muscle may partially explain the migratory habits of B. tsinlingensis. The high-quality B. tsinlingensis assembled genome could provide a valuable reference for the study of other
salmonids as well as aid the conservation of this endangered species.