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

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

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Hawkins, Jennifer S. Kim, HyeRan Nason, John D. Wing, Rod A. Wendel, Jonathan F.
Description	Country affiliation: United States Author Affiliation: Hawkins JS ( Iowa State University, Department of Ecology, Evolution and Organismal Biology, Ames, Iowa 50011, USA.)
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 indicate that 40%-65% of each genome is composed of transposable elements. Inspection of individual sequence types revealed differential, lineage-specific expansion of various families of transposable elements among the different plant lineages. Copia-like retrotransposable element sequences have differentially accumulated in the Gossypium species with the smallest genome, G. raimondii, while gypsy-like sequences have proliferated in the lineages with larger genomes. Phylogenetic analyses demonstrated a pattern of lineage-specific amplification of particular subfamilies of retrotransposons within each species studied. One particular group of gypsy-like retrotransposon sequences, Gorge3 (Gossypium retrotransposable gypsy-like element), appears to have undergone a massive proliferation in two plant lineages, accounting for a major fraction of genome-size change. Like maize, Gossypium has undergone a threefold increase in genome size due to the accumulation of LTR retrotransposons over the 5-10 Myr since its origin.
File Format	HTM / HTML
ISSN	10889051
e-ISSN	15495469
Journal	Genome Research
Issue Number	10
Volume Number	16
Language	English
Publisher	Cold Spring Harbor Laboratory Press
Publisher Date	2006-10-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Genetics Discipline Genomics Dna Repeat Expansion Genetics Dna Transposable Elements Evolution, Molecular Genetic Variation Genome, Plant Gossypium Phylogeny Cluster Analysis Gene Library Molecular Sequence Data Sequence Analysis, Dna Species Specificity Comparative Study Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Genetics Genetics (clinical)

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