作者
Ohad Fisher, Rama Siman‐Tov, Serge Ankri
发表日期
2004/1/1
期刊
Nucleic acids research
卷号
32
期号
1
页码范围
287-297
出版商
Oxford University Press
简介
The DNA methylation status of the protozoan parasite Entamoeba histolytica was heretofore unknown. In the present study, we developed a new technique, based on the affinity of methylated DNA to 5‐methylcytosine antibodies, to identify methylated DNA in this parasite. Ribosomal DNA and ribosomal DNA circles were isolated by this method and we confirmed the validity of our approach by sodium bisulfite sequencing. We also report the identification and the characterization of a gene, Ehmeth, encoding a DNA methyltransferase strongly homologous to the human DNA methyltransferase 2 (Dnmt2). Immunofluorescence microscopy using an antibody raised against a recombinant Ehmeth showed that Ehmeth is concentrated in the nuclei of trophozoites. The recombinant Ehmeth has a weak but significant methyltransferase activity when E.histolytica genomic DNA is used as substrate. 5‐Azacytidine (5‐AzaC …
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O Fisher, R Siman‐Tov, S Ankri - Nucleic acids research, 2004