Inventory of the cichlid olfactory receptor gene repertoires: identification of olfactory genes with more than one coding exon

Table 4 Distribution of OR gene pairs, triplets and quadruplets sharing a strong percentage level of nucleotide and AA identities

Pairs		Bur	Zeb	Bri	Nye	Til
	Bur	2	9	0	11	0
	Zeb		0	0	10	0
	Bri			0	1	0
	Nye				0	0
	Til					7
Triplets	Bur	Zeb	Nye	37
	Bur	Bur	Nye	1
	Til	Til	Til	1
Quadruplets	Bur	Zeb	Nye	Bri	2
	Bur	Zeb	Nye	Til	1
	Til	Til	Til	Til	1

Olfactory receptors sharing 99% of AA identity were identified from the phylogenetic tree. The greatest numbers of pairs or triplets were found between H. burtoni, M. zebra and P. nyererei, in agreement with their closer phylogenetic relatedness. In O. niloticus 7 pairs, 1 triplet and 2 quadruplets of paralogous genes were identified consistent with this repertoire having undergone a higher level of duplication. The list of genes is shown in Additional file 5.

ISSN: 1471-2164