TRYPANOSOMA-CRUZI RIBOSOMAL DNA - MAPPING OF A PUTATIVE DISTAL PROMOTER

被引:30
作者
MARTINEZCALVILLO, S [1 ]
HERNANDEZ, R [1 ]
机构
[1] NATL AUTONOMOUS UNIV MEXICO,INST INVEST BIOMED,MEXICO CITY 04510,DF,MEXICO
关键词
RNA POLYMERASE I; EXTERNAL TRANSCRIBED SPACER; TRANSCRIPTION START POINT; NUCLEOTIDE SEQUENCE; GENE EVOLUTION;
D O I
10.1016/0378-1119(94)90268-2
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
The nucleotide (nt) sequence (2106 bp) of a cloned rDNA (encoding ribosomal RNA) spacer region from Trypanosoma cruzi was determined and a putative transcription start point (tsp) was mapped. The assigned length for the transcribed spacer is 1768 bp and its tsp is present 270-bp upstream from an alternative tsp published for the equivalent gene from another T. cruzi strain [Dietrich et al., Gene 125 (1993) 103-107]. Sequence comparisons of the nt flanking both T. cruzi tsp with the homologous regions from both other trypanosomatids, and other eukaryotes, indicate that these sequences are poorly conserved within the family Trypanosomatidae. This finding reinforces the proposal that the speciation of trypanosomatids may have occurred early in evolution.
引用
收藏
页码:243 / 247
页数:5
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