نتایج جستجو برای: trnl uaa intron loss

تعداد نتایج: 459981  

Journal: :Kew Bulletin 2021

A distinctive new species, Sesuvium curassavicum Sukhor. (Aizoaceae: Sesuvioideae), restricted to the Caribbean Basin (Kingdom of Netherlands: Curaçao and Bonaire Islands, North Colombia: La Guajira Department, Venezuela: Falcón State), is described illustrated. It differs from all other perennial species growing in West Indies by its papillate stems wrinkled seeds. Based on molecular phylogene...

Journal: :Genetics 1978
A Ronen C Halevy N Kass

Spontaneous, 2-aminopurine- and 5-bromouracil-induced mutations at six rII nonsense codons were studied in phage T4 strains possessing wild-type and mutant gene 43 alleles. The mutation pathways studied included interconversions and reversions of nonsense codons. The tsCB87 allele, which specifies an antimutator DNA polymerase, reduced base-analogue-induced mutation frequencies along all pathwa...

2008
Robert L. Jarret

Variability within eight cpDNA introns including trnS-trnfM, trnL-trnT, trnH-psbA, trnF-trnL, trnD-trnT, trnCrpoB, rps16 and matK, and the nuclear waxy introns was examined in seven species of Capsicum (C. annuum, C. baccatum, C. chinense, C. frutescens, C. pubescens, C. chacoense and C. rhomboideum) in order to evaluate the feasibility of utilizing these loci for DNA barcoding within the C. an...

2004
F-J Sun

Considerable controversy exists with regard to the proper delimitation of Cymopterus (Apiaceae subfamily Apioideae) and its relationship to the other perennial endemic umbellifers of western North America. Previous molecular systematic studies using nuclear (rDNA ITS) and, for subsets of taxa, plastid (rps16 intron and trnF-trnL-trnT) DNA sequences have revealed that the genus Cymopterus is pol...

Journal: :Journal of immunology 2002
Yuko Ohta E Churchill McKinney Michael F Criscitiello Martin F Flajnik

Cartilaginous fish (e.g., sharks) are derived from the oldest vertebrate ancestor having an adaptive immune system, and thus are key models for examining MHC evolution. Previously, family studies in two shark species showed that classical class I (UAA) and class II genes are genetically linked. In this study, we show that proteasome genes LMP2 and LMP7, shark-specific LMP7-like, and the TAP1/2 ...

2015
Joanna Mytnik-Ejsmont Dariusz L. Szlachetko Przemysław Baranow Kevin Jolliffe Marcin Górniak

Three plastid regions, matK, rpl32-trnL and rpl16 intron and the ITS1-5.8S-ITS2 nuclear ribosomal DNA were used to demonstrate a phylogenetic placement of the genus Hederorkis (Orchidaceae) for the first time. The taxonomic position of this genus has been unclear thus far. The phylogenetic and morphological relations of Hederorkis to the most closely related genera Sirhookera, Adrorhizon, Bromh...

Journal: :Molecular biology and evolution 2012
Nancy J Hepburn Derek W Schmidt Jeffrey P Mower

Intron loss is often thought to occur through retroprocessing, which is the reverse transcription and genomic integration of a spliced transcript. In plant mitochondria, several unambiguous examples of retroprocessing are supported by the parallel loss of an intron and numerous adjacent RNA edit sites, but in most cases, the evidence for intron loss via retroprocessing is weak or lacking entire...

2013
Robin van Schendel Marcel Tijsterman

How introns are lost from eukaryotic genomes during evolution remains an enigmatic question in biology. By comparative genome analysis of five Caenorhabditis and eight Drosophila species, we found that the likelihood of intron loss is highly influenced by the degree of sequence homology at exon-intron junctions: a significant elevated degree of microhomology was observed for sequences immediate...

Journal: :Molecular phylogenetics and evolution 2004
B-A Beier J A A Nylander M W Chase M Thulin

Phylogenetic relationships within Fagonia were inferred from analyses of plastid trnL intron and nuclear ribosomal ITS DNA sequences. Sampling of the genus was nearly complete, including 32 of 34 species. Phylogenetic analysis was carried out using parsimony, and Bayesian model averaging. The latter method allows model-based inference while accounting for model-selection uncertainty, and is her...

Journal: :The Journal of biological chemistry 1984
M C Ganoza K Buckingham P Hader T Neilson

It has been proposed that the sequences surrounding nonsense codons determine the efficiency of protein-chain termination. To test this hypothesis, the termination factor, RF-1, was purified to near homogeneity and was used to examine the specificity of in vitro prokaryotic termination as a function of the nature and number of bases adjacent to UAA. Oligomers with different nucleotide sequences...

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