Evidence for acquisition of virulence effectors in pathogenic chytrids

Table 3 Summary of evolutionary rate and positive selection analyses

Gene family	Lineage	d_N/d_S¹	Positive selection²	PSS³
Serine peptidase	Bd	0.46	+	30, 19, 14*
	bacteria	0.01	-	-
DXX-DAB	Bd	0.70	+	43, 8*
	oomycetes	0.40	-	-
DFB	Bd	0.64	+	90, 21, 11*
	oomycetes	0.27	-	-
DX8	Bd	0.88	+	101, 18, 8*
	oomycetes	0.52	+	41, 12, 5*
DXX-DXV	Bd	0.65	+	114, 2*
	oomycetes	0.59	+	27, 16, 12*
DXX-DHA	Bd	0.78	+	61, 18, 8*
	oomycetes	0.63	+	28, 11, 4*
DFA-DDC	Bd	0.69	+	36, 17, 8*
	oomycetes	0.26	-	-
DN17	Bd	0.50	+	25, 8, 3*
	oomycetes	0.47	+	29, 13, 9*

¹The d_N /d_S ratio average across all sites and lineages under PAML model M0.
²"+" signs indicate that positive selection acted on the evolution of these genes, while "-" signs indicate that no positive selection was identified. These results were obtained based on the likelihood ratio tests of three site-specific models (Additional file 1).
³PPS indicates positively selected sites (ω > 1 under PAML model M2a). The number of amino acid residues with the posterior probability (PP) of positive selection greater than 0.05 is shown. **: PP > 0.99; *: PP > 0.95.

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