Strong sequence conservation of a 38 bp region near the center of the extrachromosomal rDNA palindrome in different Tetrahymena species.
AUTOR(ES)
Engberg, J
RESUMO
The restriction-endonuclease map and the nucleotide sequence of the central region in the extrachromosomal rDNA palindrome of two micronuclear and one a-micronucleate species of Tetrahymena has been determined. The sequence data show that the different species investigated have a 24 or 26 nucleotide sequence region at the very center of the rDNA molecule which is non-palindromic. Comparison of the present sequence data with the published data of another micronucleate species reveal that a segment of 38 base pairs just outside the non-palindromic center is highly conserved in all the different species, while the rest of the central region show little sequence homology. The relevance of this conserved region to the amplification process of the rDNA molecule is discussed.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=326097Documentos Relacionados
- Sequence comparison of the rDNA introns from six different species of Tetrahymena.
- Complete sequence of the extrachromosomal rDNA molecule from the ciliate Tetrahymena thermophila strain B1868VII.
- Inheritance of extrachromosomal rDNA in Physarum polycephalum.
- Modular structural elements in the replication origin region of Tetrahymena rDNA.
- Extrachromosomal circular nuclear rDNA in Euglena gracilis.