Amplification and phylogenetic relationships of a subfamily of blood, a retrotransposable element of Drosophila.

abstract：:Microsporidia are unicellular eukaryotes living as obligate intracellular parasites. Lacking mitochondria, they were initially considered as having diverged before the endosymbiosis at the origin of mitochondria. That microsporidia were primitively amitochondriate was first questioned by the discovery of microsporidia...

journal_title：Journal of molecular evolution

authors： Thomarat F,Vivarès CP,Gouy M

更新日期：2004-12-01 00:00:00

abstract：:The observed and expected frequencies of occurrence of microsatellites in the yeast Saccharomyces cerevisiae were investigated. In all cases, the observed frequencies exceeded the expected ones. In contrast to predictions by Messier et al. (1996), there is no critical number of repeats beyond which the observed freque...

journal_title：Journal of molecular evolution

authors： Pupko T,Graur D

更新日期：1999-03-01 00:00:00

abstract：:RNA has a myriad of biological roles in contemporary life. We use the RNA paradigm for genotype-phenotype mappings to study the evolution of multiple coding in dependence to mutation rates. We study three different one-to-many genotype-phenotype mappings which have the potential to encode the information for multiple ...

journal_title：Journal of molecular evolution

authors： de Boer FK,Hogeweg P

更新日期：2014-12-01 00:00:00

abstract：:Bacterial family C DNA polymerases (DNA pol IIIs), the major chromosomal replicative enzymes, have been provisionally classified based on primary sequences and domain structures into three classes: class I (Escherichia coli DNA pol C-type), class II (Bacillus subtilis DNA pol C-type), and class III (cyanobacterial DNA...

journal_title：Journal of molecular evolution

authors： Huang YP,Ito J

更新日期：1999-06-01 00:00:00

abstract：:It has been argued that downstream enzymes in metabolic pathways are expected to be subject to reduced selective constraint, while upstream enzymes, particularly those at pathway branch points, are expected to exhibit more frequent adaptive substitution than downstream enzymes. We examined whether these expectations a...

journal_title：Journal of molecular evolution

authors： Rausher MD,Lu Y,Meyer K

更新日期：2008-08-01 00:00:00

abstract：:We present phylogenetic evidence that a group I intron in an angiosperm mitochondrial gene arose recently by horizontal transfer from a fungal donor species. A 1,716-bp fragment of the mitochondrial coxI gene from the angiosperm Peperomia polybotrya was amplified via the polymerase chain reaction and sequenced. Compar...

journal_title：Journal of molecular evolution

authors： Vaughn JC,Mason MT,Sper-Whitis GL,Kuhlman P,Palmer JD

更新日期：1995-11-01 00:00:00

abstract：:The alpha-esterase cluster of D. melanogaster contains 11 esterase genes dispersed over 60 kb. Embedded in the cluster are two unrelated open reading frames that have sequence similarity with genes encoding ubiquitin-conjugating enzyme and tropomyosin. The esterase amino acid sequences show 37-66% identity with one an...

journal_title：Journal of molecular evolution

authors： Robin C,Russell RJ,Medveczky KM,Oakeshott JG

更新日期：1996-09-01 00:00:00

abstract：:In bacteria, synonymous codon usage can be considerably affected by base composition at neighboring sites. Such context-dependent biases may be caused by either selection against specific nucleotide motifs or context-dependent mutation biases. Here we consider the evolutionary conservation of context-dependent codon b...

journal_title：Journal of molecular evolution

authors： McVean GA,Hurst GD

更新日期：2000-03-01 00:00:00

abstract：:Mitochondrial DNA (mtDNA) restriction site maps for nine species of the Drosophila obscura subgroup and for Drosophila melanogaster were established. Taking into account all restriction enzymes (12) and strains (45) analyzed, a total of 105 different sites were detected, which corresponds to a sample of 3.49% of the m...

journal_title：Journal of molecular evolution

authors： González AM,Hernández M,Volz A,Pestano J,Larruga JM,Sperlich D,Cabrera VM

更新日期：1990-08-01 00:00:00

abstract：:Small heat shock proteins (sHSPs), as one subclass of molecular chaperones, are important for cells to protect proteins under stress conditions. Unlike the large HSPs (represented by Hsp60 and Hsp70), sHSPs are highly divergent in both primary sequences and oligomeric status, with their evolutionary relationships bein...

journal_title：Journal of molecular evolution

authors： Fu X,Jiao W,Chang Z

更新日期：2006-03-01 00:00:00

abstract：:Single likelihood ancestor counting (SLAC), fixed effects likelihood (FEL), and several random effects likelihood (REL) methods were utilized to identify positively and negatively selected sites in sexually induced gene 1 (Sig1) of four different Thalassiosira species. The SLAC analysis did not find any sites affected...

journal_title：Journal of molecular evolution

authors： Sorhannus U,Kosakovsky Pond SL

更新日期：2006-08-01 00:00:00

abstract：:In the traditional concept for the origin of life as proposed by Oparin and Haldane in the 1920s, prebiotic reactants became slowly concentrated in the primordial oceans and life evolved slowly from a series of highly protracted chemical reactions during the first billion years of Earth's history. However, chemical e...

journal_title：Journal of molecular evolution

authors： Oberbeck VR,Marshall J,Shen T

更新日期：1991-01-01 00:00:00

abstract：:Since their discovery in Metazoa, the three nuclear RNA polymerases (RNAPs) have been found in fungi, plants, and diverse protists. In all eukaryotes studied to date, RNAPs I, II, and III collectively transcribe all major RNAs made in the nucleus. We have found genes for the largest subunit (RPD1/RPE1) of a new DNA-de...

journal_title：Journal of molecular evolution

authors： Luo J,Hall BD

更新日期：2007-01-01 00:00:00

abstract：:Group I introns are mobile RNA enzymes (ribozymes) that encode conserved primary and secondary structures required for autocatalysis. The group I intron that interrupts the tRNA-Leu gene in cyanobacteria and plastids is remarkable because it is the oldest known intervening sequence and may have been present in the com...

journal_title：Journal of molecular evolution

authors： Simon D,Fewer D,Friedl T,Bhattacharya D

更新日期：2003-12-01 00:00:00

abstract：:In studies of molecular evolution, the assumption that protein evolution is reversible has often been made, but rarely tested. Here we use a large set of orthologous murid protein coding sequences to perform a simple test of reversibility, and find no evidence to reject the assumption of reversibility in protein evolu...

journal_title：Journal of molecular evolution

authors： Smith NG,Eyre-Walker A

更新日期：2001-05-01 00:00:00

abstract：:To get deeper insight into the evolution of phosphoenolpyruvate carboxylase we have identified PEPC fragments (about 1,100 bp) of another 12 plants species not yet investigated in this context. The selected plants include one Chlorophyta, two Bryophyta, four Pteridophyta, and five Spermatophyta species. The obtained p...

journal_title：Journal of molecular evolution

authors： Gehrig HH,Heute V,Kluge M

更新日期：1998-01-01 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

authors： Lee MS

更新日期：1999-09-01 00:00:00

abstract：:In order to assess the roles of gene conversion followed by natural selection and balancing selection for point mutations in polymorphisms at major histocompatibility complex (MHC) loci, DNA sequences of several mammalian taxa were analyzed. Synonymous and nonsynonymous diversities were estimated separately for the an...

journal_title：Journal of molecular evolution

authors： Ohta T

更新日期：1995-08-01 00:00:00

abstract：:Parsimony is commonly used to infer the direction of substitution and mutation. However, it is known that parsimony is biased when the base composition of the DNA sequence is skewed. Here I quantify this effect for several simple cases. The analysis demonstrates that parsimony can be misleading even when levels of seq...

journal_title：Journal of molecular evolution

authors： Eyre-Walker A

更新日期：1998-12-01 00:00:00

abstract：:Compared with the X chromosome, the mammalian Y chromosome is considerably diminished in size and has lost most of its ancestral genes during evolution. Interestingly, for the X-degenerate region on the Y chromosome, human has retained all 16 genes, while chimpanzee has lost 4 of the 16 genes since the divergence of t...

journal_title：Journal of molecular evolution

authors： Goto H,Peng L,Makova KD

更新日期：2009-02-01 00:00:00

abstract：:The RpoS sigma factor in proteobacteria regulates genes in stationary phase and in response to stress. Although of conserved function, the RpoS regulon may have different gene composition across species due to high genomic diversity and to known environmental conditions that select for RpoS mutants. In this study, the...

journal_title：Journal of molecular evolution

authors： Chiang SM,Schellhorn HE

更新日期：2010-06-01 00:00:00

abstract：:Two families of high-cysteine chorion proteins in Bombyx mori are encoded in 15 tandemly arranged nonidentical gene pairs. It is assumed that this locus arose by duplication with subsequent sequence divergence. We have compared DNA sequences from two such neighboring pairs of genes in an attempt to understand the mann...

journal_title：Journal of molecular evolution

authors： Rodakis GC,Lecanidou R,Eickbush TH

更新日期：1984-01-01 00:00:00

abstract：:The simple codominant expression of the alleles at the self-incompatibility locus ( S) of Solanaceae and their extraordinary spectrum of sequence diversity present an ideal case for understanding the molecular forces that shape the sequence polymorphism of genes involved in recognition reactions. Here, with unpreceden...

journal_title：Journal of molecular evolution

authors： Lu Y

更新日期：2002-06-01 00:00:00

abstract：:Selection pressures on proteins are usually measured by comparing homologous nucleotide sequences (Zuckerkandl and Pauling 1965). Recently we introduced a novel method, termed volatility, to estimate selection pressures on proteins on the basis of their synonymous codon usage (Plotkin and Dushoff 2003; Plotkin et al. ...

journal_title：Journal of molecular evolution

authors： Plotkin JB,Dushoff J,Desai MM,Fraser HB

更新日期：2006-11-01 00:00:00

abstract：:Microsporidia are a group of obligate intracellular eukaryotic parasites with small genomes. They infect animals from a wide variety of phyla, including humans. Two manganese superoxide dismutase (MnSOD) genes, designated NbMnSOD1 and NbMnSOD2, were found to be organized in a tandem array within the Nosema bombycis ge...

journal_title：Journal of molecular evolution

authors： Xiang H,Pan G,Vossbrinck CR,Zhang R,Xu J,Li T,Zhou Z,Lu C,Xiang Z

更新日期：2010-12-01 00:00:00

abstract：:Copia is a retrotransposon that appears to be distributed widely among the Drosophilidae subfamily. Evolutionary analyses of regulatory regions have indicated that the Copia retrotransposon evolved through both positive and purifying selection, and that horizontal transfer (HT) could also explain its patchy distributi...

journal_title：Journal of molecular evolution

authors： de Setta N,Van Sluys MA,Capy P,Carareto CM

更新日期：2011-03-01 00:00:00

abstract：:Fimbrial adhesins allow bacteria to interact with and attach to their environment. The bacteria possibly benefit from these interactions, but all external structures including adhesins also allow bacteria to be identified by other organisms. Thus adhesion molecules might be under multiple forms of selection including ...

journal_title：Journal of molecular evolution

authors： Peek AS,Souza V,Eguiarte LE,Gaut BS

更新日期：2001-02-01 00:00:00

abstract：:The homeobox gene Hoxa-13 codes for a transcription factor involved in multiple functions, including body axis and hand/foot development in tetrapods. In this study we investigate whether the loss of one function (e.g., limb loss in snakes) left a molecular footprint in exon 1 of Hoxa-13 that could be associated with ...

journal_title：Journal of molecular evolution

authors： Kohlsdorf T,Cummings MP,Lynch VJ,Stopper GF,Takahashi K,Wagner GP

更新日期：2008-12-01 00:00:00

abstract：:Two types of gene encoding small subunits (SSU) of ADP-glucose pyrophosphorylase, a starch-biosynthetic enzyme, have been found in cereals and other grasses. One of these genes encodes two SSU proteins. These are targeted to different subcellular compartments and expressed in different organs of the plant: the endospe...

journal_title：Journal of molecular evolution

authors： Rösti S,Denyer K

更新日期：2007-09-01 00:00:00

abstract：:Since the genetic code first was determined, many have claimed that it is organized adaptively, so as to assign similar codons to similar amino acids. This claim has proved difficult to establish due to the absence of relevant comparative data on alternative primordial codes and of objective measures of amino acid exc...

journal_title：Journal of molecular evolution

authors： Stoltzfus A,Yampolsky LY

更新日期：2007-10-01 00:00:00