Research Article

Comparative Analysis of CpG Islands in Four Fish Genomes

Table 1

Summary of five fish genomes. CpG islands in this table were identified by Takai and Jones’ algorithm [7]. The number of genes in each fish genome was based on the Ensembl database (http://www.ensembl.org/, build 49). Ob /Ex : the ratio of the observed over the expected CpG dinucleotides in a fish genome.

Common nameSpecies nameLength (Mb)Number of genesGC content (%)Ob /Ex Number of CGIsCGI density (/Mb)

TetraodonTetraodon nigroviridis18728 63945.90.60130 175161.6
SticklebackGasterosteus aculeatus39122 31044.50.66261 768157.8
MedakaOryzias latipes58220 15940.10.47921 52237.0
ZebrafishDanio rerio152425 58236.50.53122 39214.7
FuguTakifugu rubripes35119 24445.50.56547 251134.5