Sox genes encode a family of transcription factors which are characterized by the conserved HMG domain and are involved in a diverse range of developmental processes. Using degenerate primer PCR, 7 different sequences encoding the HMG domains of Sox1, Sox9 and Sox1 1b were cloned and sequenced from genomic DNA in the red crucian carp (Carassius carassius red variety). In the case of Sox1 and Sox1 1b, we found evidence of gene duplication. In the phylogenetic tree, two paralogs of Sox1 1b (Sox1 1b1 and Sox1 1b2) fit within the clade of Sox11, especially in the Sox 1b subfamily, not in the Sox1 ...
