BMC Ecology and Evolution

Table 2 Base composition (in percent GC) of introns and at the third position of four-fold degenerate amino acids.

From: Codon usage in twelve species of Drosophila

	Dmel	Dsim	Dsec	Dyak	Dere	Dana	Dpse	Dper	Dwil	Dmoj	Dvir	Dgri
All 6,698 homologues
No. introns	24960	19890	20742	20768	20716	20826	20492	20467	20535	20784	20772	20876
Total intron length (Mb)	27.9	12.0	12.2	13.3	12.8	14.4	12.7	13.4	18.2	17.0	16.5	15.4
Average intron length (bp)	1119	1546	1520	1637	1582	1991	2075	2107	2565	2236	2120	1754
No. introns: 100/2000^a	8769	4505	4606	4700	4698	4227	3460	3509	3860	4472	4769	5324
Intron GC% (Wt.)^b	40.3	41.1	41.0	40.8	41.4	40.8	44.1	44.3	35.1	37.3	38.6	36.8
Intron GC% (Ave.)^c	37.0	38.5	38.2	37.7	38.6	38.2	43.3	43.9	34.2	35.5	37.3	33.7
Intron GC% (Ave. 100/2000)^d	37.6	37.9	37.5	37.2	37.9	37.5	42.5	43.0	33.5	34.5	36.5	32.7
GC% 4-fold AA^e	66.8	68.3	67.9	68.1	68.4	65.8	69.7	69.5	51.0	64.2	66.3	62.8
33 F homologues
Intron GC% (Wt.)^b	32.1 (31.3)^f	34.0	32.3	33.3	32.6	39.4	35.4	35.9	35.8	35.8	34.2	30.2
Intron GC% (Ave.)^c	28.8 (28.4)^f	29.0	28.3	28.5	27.9	28.8	31.3	31.1	34.1	31.2	30.6	26.9
Intron GC% (Ave 100/2000)^d	29.8 (29.8)^f	32.7	31.4	32.0	30.5	30.6	33.8	34.2	33.3	33.9	32.9	26.5
GC% 4-fold AA^e	37.9	37.8	37.5	37.5	37.5	34.7	43.7	43.3	44.9	43.4	50.8	53.4

^aSubset of introns between 100 and 2000 bp after removing 50 bp at each end and possible transposable elements.
^bWeighted average %GC from cumulative sequence (all introns concatenated).
^cUnweighted average %GC from all introns.
^d Unweighted average %GC only from introns between 100 and 2000 bp after removing 50 bp at each end and transposable elements.
^eGC% of third position of four-fold degenerate amino acid codons.
^fGC% from all 79 genes known to be on the F element in Dmel that have introns are shown in parentheses.

Back to article page

ISSN: 2730-7182

Contact us

General enquiries: journalsubmissions@springernature.com