Telomere maintenance and length regulation in Trypanosoma brucei
AUTOR(ES)
Horn, David
FONTE
Oxford University Press
RESUMO
Transcription of telomere proximal variant surface glycoprotein genes is mono-allelic in bloodstream-form Trypanosoma brucei. The terminal DNA sequence at these telomeres consists of tandem T2AG3 repeats, which increase in length by ∼8 bp per cell division balanced by occasional loss of large numbers of repeats. Here we have used targeted chromosome fragmentation to investigate the sequence requirements for telomere formation in T.brucei. Telomere formation is most efficient on tandem T2AG3 repeats, but can also occur on specific templates found within ‘random’ sequence substrates and on G-rich motifs proximal to a double-strand break. Newly formed telomeres are extended faster than other native telomeres, but as the telomere becomes longer the rate of extension declines. Telomere length regulation in T.brucei is discussed in the context of recent results from other cell types.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=384376Documentos Relacionados
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