The nuclear genome of Brachypodium distachyon: analysis of BAC end sequences

Funct Integr Genomics. 2008 May;8(2):135-47. doi: 10.1007/s10142-007-0062-7. Epub 2007 Nov 6.

Abstract

Due in part to its small genome (approximately 350 Mb), Brachypodium distachyon is emerging as a model system for temperate grasses, including important crops like wheat and barley. We present the analysis of 10.9% of the Brachypodium genome based on 64,696 bacterial artificial chromosome (BAC) end sequences (BES). Analysis of repeat DNA content in BES revealed that approximately 11.0% of the genome consists of known repetitive DNA. The vast majority of the Brachypodium repetitive elements are LTR retrotransposons. While Bare-1 retrotransposons are common to wheat and barley, Brachypodium repetitive element sequence-1 (BRES-1), closely related to Bare-1, is also abundant in Brachypodium. Moreover, unique Brachypodium repetitive element sequences identified constitute approximately 7.4% of its genome. Simple sequence repeats from BES were analyzed, and flanking primer sequences for SSR detection potentially useful for genetic mapping are available at http://brachypodium.pw.usda.gov . Sequence analyses of BES indicated that approximately 21.2% of the Brachypodium genome represents coding sequence. Furthermore, Brachypodium BES have more significant matches to ESTs from wheat than rice or maize, although these species have similar sizes of EST collections. A phylogenetic analysis based on 335 sequences shared among seven grass species further revealed a closer relationship between Brachypodium and Triticeae than Brachypodium and rice or maize.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Base Sequence
  • Cell Nucleus / genetics
  • Chromosomes, Artificial, Bacterial*
  • DNA, Plant / chemistry*
  • Expressed Sequence Tags / chemistry
  • Genome, Plant*
  • Genomics
  • Microsatellite Repeats
  • Molecular Sequence Data
  • Phylogeny
  • Poaceae / classification
  • Poaceae / genetics*
  • Repetitive Sequences, Nucleic Acid*
  • Retroelements
  • Terminal Repeat Sequences

Substances

  • DNA, Plant
  • Retroelements