3.6 Gene family identification
Gene family analysis identified a total of 71,331 gene families among
five kinds of shellfish (Supporting Information Table S8), and we
discovered 23,063 gene families clustered by 38,841 protein-coding genes
in the Asian Clam genome. We compared the C. fluminea genome to
those of C. gigas , L. gigantea , B. platifrons , andC. virginica and discovered that 16,170 gene families were
specific to C. fluminea (Figure 4A). Additionally, we
statistically analyzed several gene features, including single-copy
orthologs, multiple copy orthologs, other orthologs, and unique genes
(Figure 4B). The five shellfish shared 146 single-copy orthologs, and
the Asian Clam genome contained 25,878 unique genes (Supporting
Information Table S9).