Genome Structural Variation Landscape and Its Selection Signatures in the Fast-growing Strains of the Pacific Oyster, Crassostrea gigas

The Pacific oyster ( Crassostrea gigas ) genome is highly polymorphic and affluent in structural variations (SVs), a significant source of genetic variation underlying inter-individual differences. Here, we used two genome assemblies and 535 individuals of genome re-sequencing data to construct a co...

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Bibliographic Details
Published in:Marine biotechnology (New York, N.Y.) N.Y.), 2021-10, Vol.23 (5), p.736-748
Main Authors: Jiao, Zexin, Tian, Yuan, Hu, Boyang, Li, Qi, Liu, Shikai
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Copy number
Crassostrea gigas
Engineering
Freshwater & Marine Ecology
Gene sequencing
Genes
Genetic diversity
Genomes
Histidine
Identification
Life Sciences
Marine molluscs
Metabolism
Microbiology
Original Article
Oysters
Sequencing
Statistical methods
Tryptophan
Zoology
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Summary:The Pacific oyster ( Crassostrea gigas ) genome is highly polymorphic and affluent in structural variations (SVs), a significant source of genetic variation underlying inter-individual differences. Here, we used two genome assemblies and 535 individuals of genome re-sequencing data to construct a comprehensive landscape of structural variations in the Pacific oyster. Through whole-genome alignment, 11,087 short SVs and 11,561 copy number variations (CNVs) were identified. While analysis of re-sequencing data revealed 511,170 short SVs and 979,486 CNVs, a total of 63,100 short SVs and 58,182 CNVs were identified in at least 20 samples and regarded as common variations. Based on the common short SVs, both Fst and Pi ratio statistical methods were employed to detect the selective sweeps between 20 oyster individuals from the fast-growing strain and 20 individuals from their corresponding wild population. A total of 514 overlapped regions (8.76 Mb), containing 746 candidate genes, were identified by both approaches, in addition with 103 genes within 61 common CNVs only detected in the fast-growing strains. The GO enrichment and KEGG pathway analysis indicated that the identified candidate genes were mostly associated with apical part of cell and were significantly enriched in several metabolism-related pathways, including tryptophan metabolism and histidine metabolism. This work provided a comprehensive landscape of SVs and revealed their responses to selection, which will be valuable for further investigations on genome evolution under selection in the oysters.
ISSN:1436-2228
1436-2236
DOI:10.1007/s10126-021-10060-5