Table 9

Percentage similarity in nucleotide sequences between isoaccepting leucine tRNA genes (trnL_UUR and trnL_CUN) within the mt genomes of six vermetids, sixteen additional caenogastropods, and three other molluscs for comparison

Species

tRNA comparison^ab

Percent similarity^c

Dendropoma maximum

L_UUR-L_CUN

60.9%

Dendropoma gregarium

L_UUR-L_CUN

69.0%

Eualetes tulipa

L_CUN-/-L_UUR

98.4%

Thylacodes squamigerus^d

L_CUN-/-L_UUR1

66.2%

L_CUN-/-L_UUR2

98.4%

L_UUR1-L_UUR2

67.6%

Vermetus erectus

L_UUR-L_CUN

76.6%

Thylaeodus sp.

L_CUN-/-L_UUR

87.0%

Oncomelania

L_UUR-L_CUN

91.2%

Littorina

L_UUR-L_CUN

80.3%

Calyptraea

L_CUN-L_UUR

58.0%

Cymatium

L_CUN-L_UUR

61.8%

Thais

L_CUN-L_UUR

58.0%

Rapana

L_CUN-L_UUR

Insufficient data^e

Conus textile

L_CUN-L_UUR

60.9%

Conus borgesi

L_CUN-L_UUR

60.9%

Lophiotoma

L_CUN-L_UUR

62.3%

Ilyanassa

L_CUN-L_UUR

64.7%

Nassarius

L_CUN-L_UUR

64.7%

Bolinus

L_CUN-L_UUR

62.3%

Cancellaria

L_CUN-L_UUR

52.7%

Cymbium

L_CUN-L_UUR

58.2%

Fusiturris

L_CUN-L_UUR

66.7%

Terebra

L_CUN-L_UUR

59.4%

Haliotis rubra

L_CUN-L_UUR

64.2%

Katharina tunicata

L_CUN-L_UUR

48.5%

Octopus vulgaris

L_CUN-L_UUR

66.7%

^a tRNA genes were aligned using Clustal X with subsequent adjustments made according to secondary structure.

^b Leucine tRNAs are presented according to relative order and position: one dash indicates that the two tRNAs are adjacent to each other; two dashes separated by a backslash indicate that these two genes are separated by at least one other gene.

^c Percent similarity reflects the number of nucleotide matches over the total length of the alignment, excluding the third base of the anticodon triplet.

^d Because Thylacodes had two copies of trnL_UUR, three pairwise comparisons between leucine tRNA genes were made for this species.

^e Sequence contained ambiguous nucleotides.

Rawlings et al. BMC Genomics 2010 11:440   doi:10.1186/1471-2164-11-440