Differential lineage-specific amplification of transposable elements is responsible for genome size variation in Gossypium.

ABSTRACT: The DNA content of eukaryotic nuclei (C-value) varies approximately 200,000-fold, but there is only a approximately 20-fold variation in the number of protein-coding genes. Hence, most C-value variation is ascribed to the repetitive fraction, although little is known about the evolutionary dynamics of the specific components that lead to genome size variation. To understand the modes and mechanisms that underlie variation in genome composition, we generated sequence data from whole genome shotgun (WGS) libraries for three representative diploid (n = 13) members of Gossypium that vary in genome size from 880 to 2460 Mb (1C) and from a phylogenetic outgroup, Gossypioides kirkii, with an estimated genome size of 588 Mb. Copy number estimates including all dispersed repetitive sequences indica

SUBMITTER: Hawkins JS 

PROVIDER: S-EPMC1581434 | biostudies-literature | 2006 Oct

REPOSITORIES: biostudies-literature