Large differences in substitutional pattern and evolutionary rate of 12S ribosomal RNA genes
نویسندگان
چکیده
منابع مشابه
Large differences in substitutional pattern and evolutionary rate of 12S ribosomal RNA genes.
We demonstrate using Drosophila, periodical cicadas, and hominid primates, that the molecular clock based on animal mitochondrial small-subunit (12S) rRNA genes ticks at significantly different relative rates depending on which taxa and which region of the gene are examined. Drosophila, which are commonly used as model taxa, are evolving in a highly peculiar manner with the majority of sites in...
متن کاملLarge Variations in Bacterial Ribosomal RNA Genes
Ribosomal RNA (rRNA) genes, essential to all forms of life, have been viewed as highly conserved and evolutionarily stable, partly because very little is known about their natural variations. Here, we explored large-scale variations of rRNA genes through bioinformatic analyses of available complete bacterial genomic sequences with an emphasis on formation mechanisms and biological significance....
متن کاملEvolutionary relationships among Japanese pond frogs inferred from mitochondrial DNA sequences of cytochrome b and 12S ribosomal RNA genes.
The evolutionary relationships among Japanese pond frogs (Rana nigromaculata, R.porosa porosa, and R. p. brevipoda) were investigated by analyzing nucleotide sequences of mitochondrial cytochrome b (cyt b) and 12S rRNA genes. The nucleotide sequences of 444-bp segment of the cyt b gene and 410-bp segment of 12S rRNA gene were determined by the PCR-direct sequencing method using 18 frogs from 13...
متن کاملMethylation Pattern of Radish (Raphanus sativus) Nuclear Ribosomal RNA Genes.
The methylation pattern of radish Raphanus sativus nuclear rDNA has been investigated using the Hpa II, Msp I, and Hha I restriction enzymes. The presence of numerous target sites for these enzymes has been shown using cloned rDNA fragments. A large fraction of the numerous rDNA units are heavily methylated, being completely resistant to Hpa II and Hpa I. However, specific sites are constantly ...
متن کاملPhylogenetic relationships of amphibian families inferred from DNA sequences of mitochondrial 12S and 16S ribosomal RNA genes.
Nucleotide sequence comparisons were used to investigate ordinal and familial relationships within the class Amphibia. Approximately 850 base pairs of the mitochondrial 16S ribosomal RNA (rRNA) gene from representatives of 28 of the 40 families of extant amphibians were sequenced. Phylogenetic analyses of these data together with published data of the 12S rRNA gene for the same families and bot...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Molecular Biology and Evolution
سال: 1996
ISSN: 0737-4038,1537-1719
DOI: 10.1093/oxfordjournals.molbev.a025660