Fig. 1

Phylogenetic trees inferred from PRDM genes. a Phylogenetic tree inferred from the SET domain amino acid sequences (alignment length: 203 aa) of the PRDM genes. b PRDM7/9 gene tree inferred from the SET domain (alignment length: 118 aa). c Phylogenetic tree inferred from the N-terminal portion of the amino acid sequences (alignment length: 351 aa) of PRDM9 depicting duplication and speciation events in ruminants. Bootstrap values greater than 70 are shown at the base of the nodes. GenBank accession numbers and scientific names of the species are shown. SET domain sequences representing all the 17 PRDM genes that were previously reported by Fumasoni et al. [31] were used as reference sequences. Asterisks (*) indicate reference sequences for human PRDM7 [52] and human PRDM9 [9, 10]. hs: Homo sapiens; pt: Pan troglodytes