. 2015 Feb 20;16(3):4429–4452. doi: 10.3390/ijms16034429

Table 2.

Exons and introns distribution across human coding genes. Human genome data was downloaded from the UCSC main table browser (GCRh38, December 2013 build). Data was processed using tabular software. Analysis was performed using 26,177 coding genes, containing 278,420 exons and 252,243 introns. See the caution in Table 1 for the shortest introns (<30–40 nt).

Chr #	Total # Genes	Total # Exons	Total # Introns	Max # Exons/Gene	Chromosome Size (bp)	Avg # of Exons/Gene	Avg Length (bp) ± Std Dev		Total Length (bp)		Shortest (bp)			Longest (bp)			Genes/Millions	Intronless Genes
Chr #	Total # Genes	Total # Exons	Total # Introns	Max # Exons/Gene	Chromosome Size (bp)	Avg # of Exons/Gene	Exon	Intron	Exon	Intron	Exon	Intron	Gene	Exon	Intron	Gene	Genes/Millions	Intronless Genes
1	2729	28,554	25,825	138	248,956,422	10.5	307 ± 702	5136 ± 15,685	8,778,766	132,633,451	3	1	270	12,573	451,448	1,491,100	11.0	149
2	1653	22,244	20,591	363	242,193,529	13.5	294 ± 723	6283 ± 20,404	6,534,873	128,437,100	1	37	582	17,969	866,400	1,900,275	6.8	35
3	1448	16,336	14,888	118	198,295,559	11.3	312 ± 765	7535 ± 24,995	5,098,251	5,098,251	3	3	294	24,927	24,927	1,502,150	7.3	44
4	989	9991	9002	84	190,214,555	10.1	338 ± 729	8471 ± 25,955	3,372,765	76,252,775	8	1	576	9856	912,253	1,474,687	5.2	107
5	1103	11,709	10,606	90	181,538,259	10.6	337 ± 785	7240 ± 22,309	3,944,829	76,788,283	6	21	530	22,753	772,519	1,519,058	6.1	85
6	1432	14,660	13,228	146	170,805,979	10.2	317 ± 713	6665 ± 19,530	4,653,325	88,160,529	6	1	354	15,177	478,750	1,987,246	8.4	109
7	1189	13,187	11,998	108	159,345,973	11.1	306 ± 744	7897 ± 24,804	4,032,145	94,745,609	2	1	600	14,889	657,297	2,304,636	7.5	55
8	869	8779	7910	86	145,138,636	10.1	327 ± 768	7942 ± 24,970	2,871,568	62,820,216	5	12	663	15,980	955,098	2,059,454	6.0	26
9	1041	11,352	10,311	98	138,394,717	10.9	304 ± 703	5971 ± 16,684	3,453,046	61,566,944	3	5	411	10,345	344,501	2,298,478	7.5	73
10	978	11,096	10,118	68	133,797,422	11.3	310 ± 715	7926 ± 24,491	3,440,785	80,199,711	5	67	563	11,090	482,575	1,783,674	7.3	26
11	1703	16,196	14,493	90	135,086,622	9.5	301 ± 665	5136 ± 19,917	4,880,180	74,431,941	2	1	484	18,173	811,152	1,468,409	12.6	211
12	1407	16,186	14,779	173	133,275,309	11.5	294 ± 688	4939 ± 15,284	4,757,204	72,993,897	9	5	396	14,194	403,400	1,249,864	10.6	50
13	426	4920	4494	83	114,364,328	11.5	330 ± 864	8615 ± 29,149	1,624,165	38,717,496	5	66	1310	21,022	740,920	1,468,616	3.7	10
14	832	8745	7913	116	107,043,718	10.5	319 ± 741	6107 ± 20,447	2,786,125	48,327,558	4	14	465	17,546	479,079	1,464,560	7.8	38
15	769	9686	8917	104	101,991,189	12.6	299 ± 689	5508 ± 16,227	2,900,248	49,116,901	8	21	918	10,227	550,366	887,042	7.5	23
16	1117	11,738	10,621	63	90,338,345	10.5	281 ± 607	3831 ± 17,251	3,296,823	40,686,903	5	1	397	10,024	778,855	1,694,208	12.4	20
17	1619	17,644	16,025	85	83,257,441	10.9	280 ± 605	3427 ± 13,031	4,943,096	54,914,295	8	1	445	9719	1,043,910	1,143,719	19.4	68
18	364	4082	3718	75	80,373,285	11.2	360 ± 872	10,356 ± 24,257	1,469,520	38,504,335	9	75	906	14,862	411,175	1,195,732	4.5	17
19	1904	16,757	14,853	106	58,617,616	8.8	296 ± 659	2283 ± 5233	4,964,098	33,906,702	6	2	541	21,693	121,730	301,152	32.5	54
20	741	7114	6373	80	64,444,167	9.6	307 ± 669	5564 ± 18,912	2,180,506	35,459,411	11	66	666	10,441	544,980	2,057,697	11.5	23
21	311	3183	2872	47	46,709,983	10.2	292 ± 700	5831 ± 16,574	930,502	16,745,676	9	9	147	11,938	323,564	834,698	6.7	54
22	598	6190	5592	55	50,818,468	10.4	300 ± 702	4156 ± 11,646	1,857,403	23,242,726	8	1	686	12,955	322,908	701,852	11.8	14
X	854	7222	6368	84	156,040,895	8.5	344 ± 774	6428 ± 22,011	2,483,142	40,934,557	10	67	501	10,363	536,479	1,368,337	5.5	79
Y	101	849	748	46	57,227,415	8.4	267 ± 576	9483 ± 32,196	226,383	5,888,994	24	67	737	8690	493,512	686,139	1.8	9