Abstract:
:We have determined the nucleotide sequence of the 26S large subunit (LSU) rRNA genes for two Tetrahymena species, T. thermophila and T. pyriformis. The inferred rRNA sequences are presented in their most probable secondary structures based on compensatory mutations, energy, and conservation criteria. The majority of the nucleotide changes between the two Tetrahymena LSU rRNAs and the positions of a relatively large deletion and of the processing cleavage sites resulting in the generation of the hidden break are all located within the so-called divergent domains or expansion segments. These are regions within the common core of secondary structure where expansions have taken place during the evolution of the rRNA of higher eukaryotes. The dispensable nature of some of the expansion segments has been taken as evidence of their non-functionality. However, our data show that a considerable selective constraint has operated to preserve the secondary structure of these segments. Especially in the case of the D2 and D8 segments, the presence of a considerable number of compensatory base changes suggests that the secondary structure of these regions is of functional importance. Alternatively, these expansion segments may have maintained characteristic folding patterns because only such structures are being tolerated within otherwise functionally important regions.
journal_name
J Mol Evoljournal_title
Journal of molecular evolutionauthors
Engberg J,Nielsen H,Lenaers G,Murayama O,Fujitani H,Higashinakagawa Tdoi
10.1007/BF02101107subject
Has Abstractpub_date
1990-06-01 00:00:00pages
514-21issue
6eissn
0022-2844issn
1432-1432journal_volume
30pub_type
杂志文章abstract::We investigated the molecular evolution of duplicated color vision genes (LWS-1 and SWS2) within cyprinid fish, focusing on the most cavefish-rich genus--Sinocyclocheilus. Maximum likelihood-based codon substitution approaches were used to analyze the evolution of vision genes. We found that the duplicated color visio...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/s00239-009-9283-9
更新日期:2009-10-01 00:00:00
abstract::It has recently been argued that living metazoans diverged over 800 million years ago, based on evidence from 22 nuclear genes for such a deep divergence between vertebrates and arthropods (Gu 1998). Two "internal" calibration points were used. However, only one fossil divergence date (the mammal-bird split) was direc...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/pl00006562
更新日期:1999-09-01 00:00:00
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journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/s00239-003-2579-2
更新日期:2004-05-01 00:00:00
abstract::Friedreich ataxia is an autosomal recessive neurodegenerative disorder associated with a GAA repeat expansion in the first intron of the gene (FRDA) encoding a novel, highly conserved, 210 amino acid protein known as frataxin. Normal variation in repeat size was determined by analysis of more than 600 DNA samples from...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/s002390010151
更新日期:2001-03-01 00:00:00
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journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/s00239-011-9478-8
更新日期:2011-12-01 00:00:00
abstract::Pituitary prolactin, like growth hormone (GH) and several other protein hormones, shows an episodic pattern of molecular evolution in which sustained bursts of rapid change contrast with long periods of slow evolution. A period of rapid change occurred in the evolution of prolactin in primates, leading to marked seque...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/s00239-004-0239-9
更新日期:2005-05-01 00:00:00
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journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/s00239-003-2493-7
更新日期:2004-01-01 00:00:00
abstract::Polymerization of various nucleoside-5'-phosphorimidazolides has been conducted in neutral aqueous solution using divalent metal ions as catalysts. Oligonucleotide formation took place from each of the ribonucleoside-5'-phosphorimidazolides, ImpC, ImpU, ImpA, ImpG, and ImpI. The yields and distributions of the resulti...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/BF02100072
更新日期:1988-01-01 00:00:00
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journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/BF01795752
更新日期:1981-01-01 00:00:00
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journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/s00239-019-09910-7
更新日期:2019-12-01 00:00:00
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journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/s002390010110
更新日期:2000-11-01 00:00:00
abstract::Introns are generally believed to evolve too rapidly and too erratically to be of much use in phylogenetic reconstructions. Few phylogenetically informative intron sequences are available, however, to ascertain the validity of this supposition. In the present study the supposition was tested on the example of the mamm...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/pl00006510
更新日期:1999-06-01 00:00:00
abstract::By a chromosome walking strategy the DNA region from Methanococcus vannielii flanking the genes for protein synthesis elongation factor (EF) 1 alpha and EF-2 was cloned and sequenced. A gene organization of 5' - beta' - open reading frame (ORF) 1 - ORF2 - S12 - S7 - EF-2 - EF-1 alpha - S10 - ORF3 - ORF4 - 3' was found...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/BF02106178
更新日期:1989-07-01 00:00:00
abstract::Ornithine decarboxylase (ODC) is the first enzyme in the polyamine biosynthetic pathway. We have studied the evolutionary history of the mammalian ODC mRNA, focusing on the rate of accumulation of sequence divergence within specific subregions of the molecule. The phylogenetic relationships among the mRNAs from severa...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/BF00556360
更新日期:1993-06-01 00:00:00
abstract::Ca(2+)/cation antiporter (CaCA) proteins are integral membrane proteins that transport Ca(2+) or other cations using the H(+) or Na(+) gradient generated by primary transporters. The CAX (for CAtion eXchanger) family is one of the five families that make up the CaCA superfamily. CAX genes have been found in bacteria, ...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/s00239-006-0048-4
更新日期:2006-12-01 00:00:00
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journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/s002390010053
更新日期:2000-06-01 00:00:00
abstract::The best reconstructions of the history of life will use both molecular time estimates and fossil data. Errors in molecular rate estimation typically are unaccounted for and no attempts have been made to quantify this uncertainty comprehensively. Here, focus is primarily on fossil calibration error because this error ...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/s00239-004-2624-9
更新日期:2004-08-01 00:00:00
abstract::There has been considerable discussion in recent years on the evolution of the tandemly repeated multigene families, since some organisms show a concerted model whereas others show a birth-and-death model. This controversial subject extends to several species of fish. In this study, three species of the Sparidae famil...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/s00239-013-9541-8
更新日期:2013-03-01 00:00:00
abstract::In this work detailed statistics on ancestral gene duplication and gene conservation in completely sequenced cellular genomes are presented. Analysis of open reading frame (ORF) products having simultaneous matches in several distinct organisms showed a significant correlation between duplication and conservation. Sys...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/pl00006580
更新日期:1999-11-01 00:00:00
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journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/pl00006486
更新日期:1999-04-01 00:00:00
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journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/BF01751807
更新日期:1977-11-25 00:00:00
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journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/pl00006474
更新日期:1999-03-01 00:00:00
abstract::Hypothetical Products from Noncoding Frames (i.e., HyPNoFs) are hypothetical, not-coded proteins, translated from alternate reading frames (i.e., coding + 1 and coding + 2) of cDNAs. HyPNoFs of CD4, PKC, oncostatin, bcl-2 proto-oncogene, tumor suppressor p53, cystic fibrosis transmembrane regulator (CFTR), and tumor n...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/BF00160503
更新日期:1995-06-01 00:00:00
abstract::The LMP7 and PSMB5 genes were created through an ancient gene duplication event of their ancestral locus. These proteins contain an active site of proteolysis, and LMP7 replaces PSMB5 as a component of the 20S proteasome after stimulation of cells by interferon-gamma. Replacement of PSMB5 by LMP7 changes the profile o...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/s00239-004-0120-x
更新日期:2005-02-01 00:00:00
abstract::The local stability of unbranched biosynthetic pathways is examined by mathematical analysis and computer simulation using a novel nonlinear formalism that appears to accurately describe biochemical systems. Four factors affecting the stability are examined: strength of feedback inhibition, equalization of the values...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/BF01741242
更新日期:1975-08-05 00:00:00
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journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/BF02407357
更新日期:1993-08-01 00:00:00
abstract::The sequence of the mitochondrial DNA (mtDNA) molecule of the European hedgehog (Erinaceus europaeus) was determined. The length of the sequence presented is 17,442 nucleotides (nt). The molecule is thus the largest eutherian mtDNA molecule so far reported. The organization of the molecule conforms with that of other ...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/BF00173175
更新日期:1995-12-01 00:00:00
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journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/s00239-011-9441-8
更新日期:2011-04-01 00:00:00
abstract::Evolutionary divergence times can be inferred from molecular distances if a molecular clock can be assumed and if the substitution rate can be estimated. We present new evidence from relative rate tests that the rate of substitution at fourfold degenerate sites of nuclear genome-coding DNA is uniform in primate and ro...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/pl00000066
更新日期:1997-01-01 00:00:00
abstract::This study was designed to characterize further the nontranscribed intergenic spacers (NTSs) of the 5S rRNA genes of fish and evaluate this marker as a tool for comparative studies. Two members of the closely related North American Great Lakes cisco species complex (Coregonus artedi and C. zenithicus) were chosen for ...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
doi:10.1007/pl00006348
更新日期:1998-06-01 00:00:00