Sequence organization of barley centromeres
AUTOR(ES)
Hudakova, Sabina
FONTE
Oxford University Press
RESUMO
By sequencing, fingerprinting and in situ hybridization of a centromere-specific large insert clone (BAC 7), the sequence organization of centromeric DNA of barley could be elucidated. Within 23 kb, three copies of the Ty3/gypsy-like retroelement cereba were present. Two elements of ∼7 kb, arranged in tandem, include long terminal repeats (LTRs) (∼1 kb) similar to the rice centromeric retrotransposon RIRE 7 and to the cereal centromeric sequence family, the primer binding site, the complete polygene flanked by untranslated regions, as well as a polypurine tract 5′ of the downstream LTR. The high density (∼200 elements/centromere) and completeness of cereba elements and the absence of internally deleted elements and solo LTRs from the BAC 7 insert represent unique features of the barley centromeres as compared to those of other cereals. Obviously, the conserved cereba elements together with barley-specific G+C-rich satellite sequences constitute the major components of centromeric DNA in this species.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=97617Documentos Relacionados
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