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PubMed2006

RTK and TGF-beta signaling pathways genes in the sea urchin genome.

The Receptor Tyrosine kinase (RTK) and TGF-beta signaling pathways play essential roles during development in many organisms and regulate a plethora of cellular responses. From the genome sequence of Strongylocentrotus purpuratus, we have made an inventory of the genes encoding receptor tyrosine kinases and their ligands, and of the genes encoding cytokines of the TGF-beta superfamily and their downstream components. The sea urchin genome contains at least 20 genes coding for canonical receptor tyrosine kinases. Seventeen of the nineteen vertebrate RTK families are represented in the sea urchin. Fourteen of these RTK among which ALK, CCK4/PTK7, DDR, EGFR, EPH, LMR, MET/RON, MUSK, RET, ROR, ROS, RYK, TIE and TRK are present as single copy genes while pairs of related genes are present for VEGFR, FGFR and INSR. Similarly, nearly all the subfamilies of TGF-beta ligands identified in vertebrates are present in the sea urchin genome including the BMP, ADMP, GDF, Activin, Myostatin, Nodal and Lefty, as well as the TGF-beta sensu stricto that had not been characterized in invertebrates so far. Expression analysis indicates that the early expression of nodal, BMP2/4 and lefty is restricted to the oral ectoderm reflecting their role in providing positional information along the oral-aboral axis of the embryo. The coincidence between the emergence of TGF-beta-related factors such as Nodal and Lefty and the emergence of the deuterostome lineage strongly suggests that the ancestral function of Nodal could have been related to the secondary opening of the mouth which characterizes this clade, a hypothesis supported by functional data in the extant species. The sea urchin genome contains 6 genes encoding TGF-beta receptors and 4 genes encoding prototypical Smad proteins. Furthermore, most of the transcriptional activators and repressors shown to interact with Smads in vertebrates have orthologues in echinoderms. Finally, the sea urchin genome contains an almost complete repertoire of genes encoding extracellular modulators of BMP signaling including Chordin, Noggin, Sclerotin, SFRP, Gremlin, DAN and Twisted gastrulation. Taken together, these findings indicate that the sea urchin complement of genes of the RTK and TGF-beta signaling pathways is qualitatively very similar to the repertoire present in vertebrates, and that these genes are part of the common genetool kit for intercellular signaling of deuterostomes.

Amino Acid Sequence↗
PubMed2004

The complete nucleotide sequence of the resistance plasmid R478: defining the backbone components of incompatibility group H conjugative plasmids through comparative genomics.

Horizontal transfer of resistance determinants amongst bacteria can be achieved by conjugative plasmid DNA elements. We have determined the complete 274,762 bp sequence of the incompatibility group H (IncH) plasmid R478, originally isolated from the Gram negative opportunistic pathogen Serratia marcescens. This self-transferable extrachromosomal genetic element contains 295 predicted genes, of which 144 are highly similar to coding sequences of IncH plasmids R27 and pHCM1. The regions of similarity among these three IncH plasmids principally encode core plasmid determinants (i.e., replication, partitioning and stability, and conjugative transfer) and we conducted a comparative analysis to define the minimal IncHI plasmid backbone determinants. No resistance determinants are included in the backbone and most of the sequences unique to R478 were contained in a large contiguous region between the two transfer regions. These findings indicate that plasmid evolution occurs through gene acquisition/loss predominantly in regions outside of the core determinants. Furthermore, a modular evolution for R478 was signified by the presence of gene neighbors or operons that were highly related to sequences from a wide range of chromosomal, transposon, and plasmid elements. The conjugative transfer regions are most similar to sequences encoded on SXT, Rts1, pCAR1, R391, and pRS241d. The dual partitioning modules encoded on R478 resemble numerous sequences; including pMT1, pCTX-M3, pCP301, P1, P7, and pB171. R478 also codes for resistance to tetracycline (Tn10), chloramphenicol (cat), kanamycin (aphA), mercury (similar to Tn21), silver (similar to pMG101), copper (similar to pRJ1004), arsenic (similar to pYV), and tellurite (two separate regions similar to IncHI2 ter determinants and IncP kla determinants). Other R478-encoded sequences are related to Tn7, IS26, tus, mucAB, and hok, where the latter is surrounded by insLKJ, and could potentially be involved in post-segregation killing. The similarity to a diverse set of bacterial sequences highlights the ability of horizontally transferable DNA elements to acquire and disseminate genetic traits through the bacterial gene pool.

Base Sequence↗
PubMed2004

Survey of the number of two-component response regulator genes in the complete and annotated genome sequences of prokaryotes.

The numbers of potential response regulator genes were determined from the complete and annotated genome sequences of Archaea and Bacteria. The numbers of each class of response regulators are shown for each organism, determined principally from BLASTP searches, but with reference to the gene category lists where available. The survey shows that for Bacteria there is a link between the total number of potential response regulator genes and both the genome complexity (number of potential protein-coding genes) and the organism's lifestyle/habitat. Increasingly complex lifestyles and genome complexities are matched by an increase in the average number of potential response regulator genes per genome, indicating that a higher degree of complexity requires a higher level of control of gene expression and cellular activity. Detailed results of this study are available online at and.

Data Collection↗
PubMed2006

A metabolic network in the evolutionary context: multiscale structure and modularity.

The enormous complexity of biological networks has led to the suggestion that networks are built of modules that perform particular functions and are "reused" in evolution in a manner similar to reusable domains in protein structures or modules of electronic circuits. Analysis of known biological networks has revealed several modules, many of which have transparent biological functions. However, it remains to be shown that identified structural modules constitute evolutionary building blocks, independent and easily interchangeable units. An alternative possibility is that evolutionary modules do not match structural modules. To investigate the structure of evolutionary modules and their relationship to functional ones, we integrated a metabolic network with evolutionary associations between genes inferred from comparative genomics. The resulting metabolic-genomic network places metabolic pathways into evolutionary and genomic context, thereby revealing previously unknown components and modules. We analyzed the integrated metabolic-genomic network on three levels: macro-, meso-, and microscale. The macroscale level demonstrates strong associations between neighboring enzymes and between enzymes that are distant on the network but belong to the same linear pathway. At the mesoscale level, we identified evolutionary metabolic modules and compared them with traditional metabolic pathways. Although, in some cases, there is almost exact correspondence, some pathways are split into independent modules. On the microscale level, we observed high association of enzyme subunits and weak association of isoenzymes independently catalyzing the same reaction. This study shows that evolutionary modules, rather than pathways, may be thought of as regulatory and functional units in bacterial genomes.

Biological Evolution↗
PubMed2003

Alp13, an MRG family protein, is a component of fission yeast Clr6 histone deacetylase required for genomic integrity.

The post-translational modifications of histones are key to the modulation of chromatin structure. Distinct patterns of modifications established by histone-modifying enzymes control diverse chromosomal processes. Here, we report the purification and molecular characterization of the fission yeast Clr6 histone deacetyl ase involved in higher order chromatin assembly. We show that a chromodomain protein Alp13, which belongs to the conserved MRG protein family linked to cellular senescence in humans, is associated with Clr6. In addition, Clr6 interacts with homologs of the mammalian transcriptional co-repressors Sin3, Pst1 and Pst2, and a WD40 repeat-containing protein, Prw1. Alp13, Pst2 and Prw1 form a stable complex with Clr6 in the nucleus. Deletion of any of these factors causes progressive loss of viability and sensitivity to DNA-damaging agents, and impairs condensation/resolution of chromosomes during mitosis. This is accompanied by hyperacetylation of histones and a reduction in histone H3 Ser10 phosphorylation, which correlates with chromosome condensation during mitosis. These results link the MRG family protein Alp13 to histone deacetylation, and suggest that Clr6 and its associated factors are essential for fundamental chromosomal events.

Acetylation↗
PubMed2005

Characterization of SR3 reveals abundance of non-LTR retrotransposons of the RTE clade in the genome of the human blood fluke, Schistosoma mansoni.

BACKGROUND: It is becoming apparent that perhaps as much as half of the genome of the human blood fluke Schistosoma mansoni is constituted of mobile genetic element-related sequences. Non-long terminal repeat (LTR) retrotransposons, related to the LINE elements of mammals, comprise much of this repetitive component of the schistosome genome. Of more than 12 recognized clades of non-LTR retrotransposons, only members of the CR1, RTE, and R2 clades have been reported from the schistosome genome. RESULTS: Inspection of the nucleotide sequence of bacterial artificial chromosome number 49_J_14 from chromosome 1 of the genome of Schistosoma mansoni (GenBank AC093105) revealed the likely presence of several RTE-like retrotransposons. Among these, a new non-LTR retrotransposon designated SR3 was identified and is characterized here. Analysis of gene structure and phylogenetic analysis of both the reverse transcriptase and endonuclease domains of the mobile element indicated that SR3 represented a new family of RTE-like non-LTR retrotransposons. Remarkably, two full-length copies of SR3-like elements were present in BAC 49-J-14, and one of 3,211 bp in length appeared to be intact, indicating SR3 to be an active non-LTR retrotransposon. Both were flanked by target site duplications of 10-12 bp. Southern hybridization and bioinformatics analyses indicated the presence of numerous copies (probably >1,000) of SR3 interspersed throughout the genome of S. mansoni. Bioinformatics analyses also revealed SR3 to be transcribed in both larval and adult developmental stages of S. mansoni and to be also present in the genomes of the other major schistosome parasites of humans, Schistosoma haematobium and S. japonicum. CONCLUSION: Numerous copies of SR3, a novel non-LTR retrotransposon of the RTE clade are present in the genome of S. mansoni. Non-LTR retrotransposons of the RTE clade including SR3 appear to have been remarkably successful in colonizing, and proliferation within the schistosome genome.

Animals↗
PubMed1984

Structure of murine complement component C3. I. Nucleotide sequence of cloned complementary and genomic DNA coding for the beta chain.

The nucleotide sequence coding for the beta chain of murine C3 was determined from cloned cDNA and genomic DNA fragments. Sonicated subfragments were randomly inserted into the bacteriophage M13 and sequenced using the dideoxynucleotide technique. Each nucleotide was sequenced on average six times in these studies. The derived amino acid sequence includes a signal peptide and a tetra-arginine sequence between the beta and alpha subunits in the precursor polypeptide prepro-C3. Together with the accompanying report (Wetsel, R.A., Lundwall, A., Davidson, F., Gibson, T., Tack, B.F., and Fey, G.H. (1984) J. Biol. Chem. 259, 13857-13862), this paper completes the analysis of the coding sequences for the prepro-C3 polypeptide. The derived molecular weight of the unglycosylated beta chain (642 amino acids) is 70,641. The sequences of the first two introns in the murine C3 gene and of the 5'-flanking 106 nucleotides are also reported. The 5'-flanking region contains a TATA consensus sequence in agreement with an earlier report (Wiebauer, K., Domdey, H., Diggelmann, H., and Fey, G.H. (1982) Proc. Natl. Acad. Sci. U. S. A. 79, 7077-7081), presumed to be involving in regulating the expression of the C3 gene. A striking feature of the derived sequence was that only 3 cysteine residues were found, all located in the C-terminal part of the polypeptide chain. No carbohydrate attachment sites were predicted in the beta chain.

Amino Acid Sequence↗
PubMed1989

The artificial worlds approach to emergent evolution.

Artificial worlds models of evolutionary systems are computer models that map the essential logical structure of ecological systems, defined as self-sustaining biological organizations. The artificial world comprises an artificial environment, with mass components, energy input, and physical states. It also comprises artificial organisms, including a genome, a phenome, and a (developmental) map that connects the genome to the phenome. Mass components are cycled and space is limited. The evolution process results, as in nature, from genetic variation combined with natural selection imposed by the finiteness of the environment. The selection criteria (fitness values) are not imposed, but rather emerge from the interactions of the organisms with each other and with the environment. The dynamics at the population level also emerges from these basic interactions. In this paper we describe the comparative properties of the EVOLVE family of artificial worlds models.

Artificial Intelligence↗
PubMed2002

The complete genomic sequence of Mycoplasma penetrans, an intracellular bacterial pathogen in humans.

The complete genomic sequence of an intracellular bacterial pathogen, Mycoplasma penetrans HF-2 strain, was determined. The HF-2 genome consists of a 1 358 633 bp single circular chromosome containing 1038 predicted coding sequences (CDSs), one set of rRNA genes and 30 tRNA genes. Among the 1038 CDSs, 264 predicted proteins are common to the Mycoplasmataceae sequenced thus far and 463 are M.penetrans specific. The genome contains the two-component system but lacks the essential cellular gene, uridine kinase. The relatively large genome of M.penetrans HF-2 among mycoplasma species may be accounted for by both its rich core proteome and the presence of a number of paralog families corresponding to 25.4% of all CDSs. The largest paralog family is the p35 family, which encodes surface lipoproteins including the major antigen, P35. A total of 44 genes for p35 and p35 homologs were identified and 30 of them form one large cluster in the chromosome. The genetic tree of p35 paralogs suggests the occurrence of dynamic chromosomal rearrangement in paralog formation during evolution. Thus, M.penetrans HF-2 may have acquired diverse repertoires of antigenic variation-related genes to allow its persistent infection in humans.

Antigenic Variation↗
PubMed2005

Emerging roles of centrosomal amplification and genomic instability in cancer.

The carcinogenic process is multistep in terms of its etiology and multifactor in terms of its evolution. In this context, the temporal accumulation of multiple genetic changes during multistage carcinogenesis that can be mediated at least in part by genomic instability may represent crucial components of tumor cell evolution. Evidence is accumulating indicating a close link between genomic instability and cancer initiation and progression. Neoplastic cells typically possess numerous genomic lesions, which may include sequence alterations (point mutations, small deletions, and insertions) and/or gross structural abnormalities in one or more chromosomes (large-scale deletions, rearrangements, gene amplifications). Furthermore karyotypic alterations, including whole chromosome loss or gain, ploidy changes (aneuploidy and polyploidy) and a variety of chromosome aberrations are common in tumor cells. Genomic instability also involves mitotic defects associated with centrosome abnormalities. However, the question of whether abnormal centrosomes cause genomic instability or develop secondary to other changes has not been conclusively resolved. In this review, the recent studies investigating genomic instability and aneuploidy in human cancer, centrosome amplification and the role of centrosomal duplication in chromosomal mis-segregetion, and genes implicated in regulating chromosome segregation, centrosomal amplification and progression in cancer cells are discussed.

Aneuploidy↗
PubMed2001

Target sites for SINE integration in Brassica genomes display nuclear matrix binding activity.

Short interspersed nuclear elements (SINEs) are ubiquitous components of complex animal and plant genomes. SINEs are believed to be important players in eukaryotic genome evolution. Studies on SINE integration sites have revealed non-random integration without strict nucleotide sequence requirements for the integration target, suggesting that the targeted DNA might assume specific secondary structures or protein associations. Here, we report that S1 SINE elements in the genomes of Brassica show an interesting preference for matrix attachment regions (MARs). Ten cloned genomic regions were tested for their ability to bind the nuclear matrix both before and after a SINE integration event. Eight of the genomic regions targeted by S1 display strong affinity for the nuclear matrix, while two show weaker binding. The SINE S1 did not display any matrix-binding capacity on its own in either non-methylated or methylated forms. In vivo, an integrated S1 is methylated while the surrounding genomic regions may remain undermethylated or undergo methylation. However, tested genomic regions containing methylated S1, with or without methylated flanking genomic sequences, were found to vary in their ability to bind the matrix in vitro. These results suggest a possible molecular basis for a preferential targeting of SINEs to MARs and a possible impact of the integration events upon gene and genome function.

Binding, Competitive↗
PubMed1992

Functions of the sequences at the ends of the inverted repeats of pseudorabies virus.

Two mutants were constructed to explore the functions of the sequences at the end of the S terminus of pseudorabies virus (PrV). In mutant vYa, 17 bp from the internal inverted repeat, as well as adjacent sequences from the L component, were deleted. In mutant v135/9, 143 bp from the internal inverted repeat (including sequences with homology to the pac-1 site of herpes simplex virus), as well as adjacent sequences from the L component, were deleted. Our aim in constructing these mutants was to ascertain whether equalization of the terminal regions of the S component would occur, whether genome termini that lack either the terminal 17 or 143 bp would be generated as a result of equalization of the repeats (thereby identifying the terminal nucleotides that may include cleavage signals), and whether inversion of the S component would occur (thereby ascertaining the importance of the deleted sequences in this process). The results obtained show the following (i) The removal of the terminal 17 or 143 bp of the internal S component, including the sequences with homology to the pac-1 site, does not affect the inversion of the Us. (ii) The equalization of both the vYa and the v135/9 inverted repeats occurs at high frequency, the terminal repeats being converted and becoming similar to the mutated internal inverted repeat. (iii) Mutants in which the 17 terminal base pairs (vYa) have been replaced by unrelated sequences are viable. However, the 143 terminal base pairs appear to be essential to virus survival; concatemeric v135/9 DNA with equalized, mutant-type, inverted repeats accumulates, but mature virions with such equalized repeats are not generated at high frequency. Since concatemeric DNA missing the 143 bp at both ends of the S component is not cleaved, the terminal 143 bp that include the sequences with homology to the pac-1 site are necessary for efficient cleavage. (iv) v135/9 intracellular DNA is composed mainly of arrays in which one S component (with two equalized inverted repeats both having the deletion) is bracketed by two L components in opposite orientations and in which two L components are in head-to-head alignment.(ABSTRACT TRUNCATED AT 250 WORDS)

Base Sequence↗
PubMed1977

An analysis of the bovine genome by density gradient centrifugation: fractionation in Cs2SO4/3,6-bis(acetatomercurimethyl)dioxane density gradient.

The fractionation of calf thymus DNA by centrifugation in density gradients of Cs2SO4/BAMD, where BAMD = 3,6-bis(acetatomercurimethyl)dioxane, is described. A large-scale separation of (dG+dC)-rich DNA fractions has been obtained, allowing the relative amounts of minor and satellite components in the bovine genome to be precisely assessed.

Animals↗
PubMed1984

Distribution of repeated DNA families in the human genome.

By means of restriction enzymes analysis and molecular hybridization, the distribution of repeated DNA families has been studied in the different DNA components into which the human genome can be fractionated by density gradient techniques. Three classes of DNA molecules have been analyzed: i) an homogeneous DNA component (satellite-like sequences; Q = 1.696 g/cm3, 3% of total DNA, AT repeated), ii) AT rich (Q = 1.698 g/cm3, 30% of total DNA, AT main-band) and GC rich (Q = 1.708 g/cm3, 6% of total DNA, GC main-band) DNA components. By this approach we have observed that Sau3A digestion of GC main-band gives rise to two bands of 75bp and 150bp, absent or under-represented in both AT rich DNA components. A preliminary characterization of these DNA fragments suggests that they contain one or more families of repeated sequences which fail to hybridize to EcoRI, HindIII and AluI families of repeats. In addition, we have observed that EcoRI sequences (alpha-RI DNA) are under-represented in GC main-band and show the same clustered organization in both AT rich DNA components.

Base Composition↗
PubMed2006

Differential lineage-specific amplification of transposable elements is responsible for genome size variation in Gossypium.

The DNA content of eukaryotic nuclei (C-value) varies approximately 200,000-fold, but there is only a approximately 20-fold variation in the number of protein-coding genes. Hence, most C-value variation is ascribed to the repetitive fraction, although little is known about the evolutionary dynamics of the specific components that lead to genome size variation. To understand the modes and mechanisms that underlie variation in genome composition, we generated sequence data from whole genome shotgun (WGS) libraries for three representative diploid (n = 13) members of Gossypium that vary in genome size from 880 to 2460 Mb (1C) and from a phylogenetic outgroup, Gossypioides kirkii, with an estimated genome size of 588 Mb. Copy number estimates including all dispersed repetitive sequences indicate that 40%-65% of each genome is composed of transposable elements. Inspection of individual sequence types revealed differential, lineage-specific expansion of various families of transposable elements among the different plant lineages. Copia-like retrotransposable element sequences have differentially accumulated in the Gossypium species with the smallest genome, G. raimondii, while gypsy-like sequences have proliferated in the lineages with larger genomes. Phylogenetic analyses demonstrated a pattern of lineage-specific amplification of particular subfamilies of retrotransposons within each species studied. One particular group of gypsy-like retrotransposon sequences, Gorge3 (Gossypium retrotransposable gypsy-like element), appears to have undergone a massive proliferation in two plant lineages, accounting for a major fraction of genome-size change. Like maize, Gossypium has undergone a threefold increase in genome size due to the accumulation of LTR retrotransposons over the 5-10 Myr since its origin.

Base Sequence↗
PubMed2001

Molecular intermediates of fitness gain of an RNA virus: characterization of a mutant spectrum by biological and molecular cloning.

The mutant spectrum of a virus quasispecies in the process of fitness gain of a debilitated foot-and-mouth disease virus (FMDV) clone has been analysed. The mutant spectrum was characterized by nucleotide sequencing of three virus genomic regions (internal ribosome entry site; region between the two AUG initiation codons; VP1-coding region) from 70 biological clones (virus from individual plaques formed on BHK-21 cell monolayers) and 70 molecular clones (RT--PCR products cloned in E. coli). The biological and molecular clones provided statistically indistinguishable definitions of the mutant spectrum with regard to the distribution of mutations among the three genomic regions analysed and with regard to the types of mutations, mutational hot-spots and mutation frequencies. Therefore, the molecular cloning procedure employed provides a simple protocol for the characterization of mutant spectra of viruses that do not grow in cell culture. The number of mutations found repeated among the clones analysed was higher than expected from the mean mutation frequencies. Some components of the mutant spectrum reflected genomes that were dominant in the prior evolutionary history of the virus (previous passages), confirming the presence of memory genomes in virus quasispecies. Other components of the mutant spectrum were genomes that became dominant at a later stage of evolution, suggesting a predictive value of mutant spectrum analysis with regard to the outcome of virus evolution. The results underline the observation that greater insight into evolutionary processes of viruses may be gained from detailed clonal analyses of the mutant swarms at the sequence level.

Adaptation, Physiological↗
PubMed2004

A genome phylogeny for mitochondria among alpha-proteobacteria and a predominantly eubacterial ancestry of yeast nuclear genes.

Analyses of 55 individual and 31 concatenated protein data sets encoded in Reclinomonas americana and Marchantia polymorpha mitochondrial genomes revealed that current methods for constructing phylogenetic trees are insufficiently sensitive (or artifact-insensitive) to ascertain the sister of mitochondria among the current sample of eight alpha-proteobacterial genomes using mitochondrially-encoded proteins. However, Rhodospirillum rubrum came as close to mitochondria as any alpha-proteobacterium investigated. This prompted a search for methods to directly compare eukaryotic genomes to their prokaryotic counterparts to investigate the origin of the mitochondrion and its host from the standpoint of nuclear genes. We examined pairwise amino acid sequence identity in comparisons of 6,214 nuclear protein-coding genes from Saccharomyces cerevisiae to 177,117 proteins encoded in sequenced genomes from 45 eubacteria and 15 archaebacteria. The results reveal that approximately 75% of yeast genes having homologues among the present prokaryotic sample share greater amino acid sequence identity to eubacterial than to archaebacterial homologues. At high stringency comparisons, only the eubacterial component of the yeast genome is detectable. Our findings indicate that at the levels of overall amino acid sequence identity and gene content, yeast shares a sister-group relationship with eubacteria, not with archaebacteria, in contrast to the current phylogenetic paradigm based on ribosomal RNA. Among eubacteria and archaebacteria, proteobacterial and methanogen genomes, respectively, shared more similarity with the yeast genome than other prokaryotic genomes surveyed.

Alphaproteobacteria↗
PubMed2004

Fast adaptive coevolution of nuclear and mitochondrial subunits of ATP synthetase in orangutan.

Nuclear and mitochondrial genomes have to work in concert to generate a functional oxidative phosphorylation (OXPHOS) system. We have previously shown that we could restore partial OXPHOS function when chimpanzee or gorilla mitochondrial DNA (mtDNA) were introduced into human cells lacking mtDNA. However, we were unable to maintain orangutan mitochondrial DNA in a human cell. We have now produced chimpanzee, gorilla, orangutan, and baboon cells lacking mtDNA and attempted to introduce mtDNA from different apes into them. Surprisingly, we were able to maintain human mtDNA in an orangutan nuclear background, even though these cells showed severe OXPHOS abnormalities, including a complete absence of assembled ATP synthetase. Phylogenetic analysis of complex V mtDNA-encoded subunits showed that they are among the most evolutionarily divergent components of the mitochondrial genome between orangutan and the other apes. Our studies showed that adaptive coevolution of nuclear and mitochondrial components in apes can be fast and accelerate in recent branches of anthropoid primates.

Animals↗