A draft annotation and overview of the human genome

Table 4 (a) Density of features per megabase in Giemsa-staining cytogenetic bands

		R		G	R/G ratio
Exons		0.0415		0.0319	1.30
CpG islands		0.0119		0.0075	1.59
GC content		42.23%		39.76%	1.06
LINE1 repeats		0.1435		0.1602	0.90
Alu repeats		0.1204		0.0937	1.28
Minisatellites		0.0090		0.0078	1.15
(b) Correlation of features in 1Mb intervals
	Exon	CpG	GC	LINE1	Alu	Minisatellite
Exon	1.00	0.65	0.64	-0.26	0.73	0.19
CpG		1.00	0.73	-0.42	0.58	0.16
GC			1.00	-0.54	0.61	0.13
LINE1				1.00	-0.20	0.28
Alu					1.00	0.23
Minisatellite						1.00

(a) Pale-staining (R) and dark-staining (G) bands are compared, with alignment of cytogenetic bands to sequence as described in the text. All of the features except LINE1 elements are denser in the R bands. The true differences are likely to be larger, as errors in cytoband alignment will tend to understate the differences in the band types. The differences in the bands are highly significant at p < 0.001 for all features except for minisatellites (p = 0.006). (b) Rank correlations of features, in 1Mb intervals (p = 0.03, corrected for multiple comparisons).

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