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PubMed1993

The genomic sequence of cardamine chlorotic fleck carmovirus.

The complete genomic sequence of cardamine chlorotic fleck carmovirus (CCFV) has been determined. The genome is a positive-sense ssRNA molecule 4041 nucleotides in length, and has 47 to 64% sequence identity with turnip crinkle, carnation mottle and melon necrotic spot carmoviruses. CCFV and these other carmoviruses have four similar open reading frames (ORFs), and CCFV has large regions of amino acid identity in all of these ORFs with a European isolate of turnip crinkle virus. CCFV, which replicates well in Arabidopsis thaliana, has only been found so far in Australia in the wild perennial brassica Cardamine lilacina.

Amino Acid Sequence↗
PubMed1998

Comparison of sample sequences of the Salmonella typhi genome to the sequence of the complete Escherichia coli K-12 genome.

Raw sequence data representing the majority of a bacterial genome can be obtained at a tiny fraction of the cost of a completed sequence. To demonstrate the utility of such a resource, 870 single-stranded M13 clones were sequenced from a shotgun library of the Salmonella typhi Ty2 genome. The sequence reads averaged over 400 bases and sampled the genome with an average spacing of once every 5,000 bases. A total of 339,243 bases of unique sequence was generated (approximately 7% representation). The sample of 870 sequences was compared to the complete Escherichia coli K-12 genome and to the rest of the GenBank database, which can also be considered a collection of sampled sequences. Despite the incomplete S. typhi data set, interesting categories could easily be discerned. Sixteen percent of the sequences determined from S. typhi had close homologs among known Salmonella sequences (P < 1e-40 in BlastX or BlastN), reflecting the proportion of these genomes that have been sequenced previously; 277 sequences (32%) had no apparent orthologs in the complete E. coli K-12 genome (P > 1e-20), of which 155 sequences (18%) had no close similarities to any sequence in the database (P > 1e-5). Eight of the 277 sequences had similarities to genes in other strains of E. coli or plasmids, and six sequences showed evidence of novel phage lysogens or sequence remnants of phage integrations, including a member of the lambda family (P < 1e-15). Twenty-three sample sequences had a significantly closer similarity a sequence in the database from organisms other than the E. coli/Salmonella clade (which includes Shigella and Citrobacter). These sequences are new candidate lateral transfer events to the S. typhi lineage or deletions on the E. coli K-12 lineage. Eleven putative junctions of insertion/deletion events greater than 100 bp were observed in the sample, indicating that well over 150 such events may distinguish S. typhi from E. coli K-12. The need for automatic methods to more effectively exploit sample sequences is discussed.

Bacteriophages↗
PubMed2006

A comparative genomics strategy for targeted discovery of single-nucleotide polymorphisms and conserved-noncoding sequences in orphan crops.

Completed genome sequences provide templates for the design of genome analysis tools in orphan species lacking sequence information. To demonstrate this principle, we designed 384 PCR primer pairs to conserved exonic regions flanking introns, using Sorghum/Pennisetum expressed sequence tag alignments to the Oryza genome. Conserved-intron scanning primers (CISPs) amplified single-copy loci at 37% to 80% success rates in taxa that sample much of the approximately 50-million years of Poaceae divergence. While the conserved nature of exons fostered cross-taxon amplification, the lesser evolutionary constraints on introns enhanced single-nucleotide polymorphism detection. For example, in eight rice (Oryza sativa) genotypes, polymorphism averaged 12.1 per kb in introns but only 3.6 per kb in exons. Curiously, among 124 CISPs evaluated across Oryza, Sorghum, Pennisetum, Cynodon, Eragrostis, Zea, Triticum, and Hordeum, 23 (18.5%) seemed to be subject to rigid intron size constraints that were independent of per-nucleotide DNA sequence variation. Furthermore, we identified 487 conserved-noncoding sequence motifs in 129 CISP loci. A large CISP set (6,062 primer pairs, amplifying introns from 1,676 genes) designed using an automated pipeline showed generally higher abundance in recombinogenic than in nonrecombinogenic regions of the rice genome, thus providing relatively even distribution along genetic maps. CISPs are an effective means to explore poorly characterized genomes for both DNA polymorphism and noncoding sequence conservation on a genome-wide or candidate gene basis, and also provide anchor points for comparative genomics across a diverse range of species.

Base Sequence↗
PubMed2001

Complete mitochondrial genome sequences of two extinct moas clarify ratite evolution.

The origin of the ratites, large flightless birds from the Southern Hemisphere, along with their flighted sister taxa, the South American tinamous, is central to understanding the role of plate tectonics in the distributions of modern birds and mammals. Defining the dates of ratite divergences is also critical for determining the age of modern avian orders. To resolve the ratite phylogeny and provide biogeographical data to examine these issues, we have here determined the first complete mitochondrial genome sequences of any extinct taxa--two New Zealand moa genera--along with a 1,000-base-pair sequence from an extinct Madagascan elephant-bird. For comparative data, we also generated 12 kilobases of contiguous sequence from the kiwi, cassowary, emu and two tinamou genera. This large dataset allows statistically precise estimates of molecular divergence dates and these support a Late Cretaceous vicariant speciation of ratite taxa, followed by the subsequent dispersal of the kiwi to New Zealand. This first molecular view of the break-up of Gondwana provides a new temporal framework for speciation events within other Gondwanan biota and can be used to evaluate competing biogeographical hypotheses.

Animals↗
PubMed2000

International Rice Genome Sequencing Project: the effort to completely sequence the rice genome.

The International Rice Genome Sequencing Project (IRGSP) involves researchers from ten countries who are working to completely and accurately sequence the rice genome within a short period. Sequencing uses a map-based clone-by-clone shotgun strategy; shared bacterial artificial chromosome/P1-derived artificial chromosome libraries have been constructed from Oryza sativa ssp. japonica variety 'Nipponbare'. End-sequencing, fingerprinting and marker-aided PCR screening are being used to make sequence-ready contigs. Annotated sequences are immediately released for public use and are made available with supplemental information at each IRGSP member's website. The IRGSP works to promote the development of rice and cereal genomics in addition to producing genome sequence data.

Chromosome Mapping↗
PubMed2000

Testing the hypothesis of a recombinant origin of human immunodeficiency virus type 1 subtype E.

The human immunodeficiency virus type 1 (HIV-1) epidemic in Southeast Asia has been largely due to the emergence of clade E (HIV-1E). It has been suggested that HIV-1E is derived from a recombinant lineage of subtype A (HIV-1A) and subtype E, with multiple breakpoints along the E genome. We obtained complete genome sequences of clade E viruses from Thailand (93TH057 and 93TH065) and from the Central African Republic (90CF11697 and 90CF4071), increasing the total number of HIV-1E complete genome sequences available to seven. Phylogenetic analysis of complete genomes showed that subtypes A and E are themselves monophyletic, although together they also form a larger monophyletic group. The apparent phylogenetic incongruence at different regions of the genome that was previously taken as evidence of recombination is shown to be not statistically significant. Furthermore, simulations indicate that bootscanning and pairwise distance results, previously used as evidence for recombination, can be misleading, particularly when there are differences in substitution or evolutionary rates across the genomes of different subtypes. Taken jointly, our analyses suggest that there is inadequate support for the hypothesis that subtype E variants are derived from a recombinant lineage. In contrast, many other HIV strains claimed to have a recombinant origin, including viruses for which only a single parental strain was employed for analysis, do indeed satisfy the statistical criteria we propose. Thus, while intersubtype recombinant HIV strains are indeed circulating, the criteria for assigning a recombinant origin to viral structures should include statistical testing of alternative hypotheses to avoid inappropriate assignments that would obscure the true evolutionary properties of these viruses.

Evolution, Molecular↗
PubMed2004

Complete chloroplast genome sequences from Korean ginseng (Panax schinseng Nees) and comparative analysis of sequence evolution among 17 vascular plants.

The nucleotide sequence of Korean ginseng (Panax schinseng Nees) chloroplast genome has been completed (AY582139). The circular double-stranded DNA, which consists of 156,318 bp, contains a pair of inverted repeat regions (IRa and IRb) with 26,071 bp each, which are separated by small and large single copy regions of 86,106 bp and 18,070 bp, respectively. The inverted repeat region is further extended into a large single copy region which includes the 5' parts of the rpsl9 gene. Four short inversions associated with short palindromic sequences that form stem-loop structures were also observed in the chloroplast genome of P. schinseng compared to that of Nicotiana tabacum. The genome content and the relative positions of 114 genes (75 peptide-encoding genes, 30 tRNA genes, 4 rRNA genes, and 5 conserved open reading frames [ycfs]), however, are identical with the chloroplast DNA of N. tabacum. Sixteen genes contain one intron while two genes have two introns. Of these introns, only one (trnL-UAA) belongs to the self-splicing group I; all remaining introns have the characteristics of six domains belonging to group II. Eighteen simple sequence repeats have been identified from the chloroplast genome of Korean ginseng. Several of these SSR loci show infra-specific variations. A detailed comparison of 17 known completed chloroplast genomes from the vascular plants allowed the identification of evolutionary modes of coding segments and intron sequences, as well as the evaluation of the phylogenetic utilities of chloroplast genes. Furthermore, through the detailed comparisons of several chloroplast genomes, evolutionary hotspots predominated by the inversion end points, indel mutation events, and high frequencies of base substitutions were identified. Large-sized indels were often associated with direct repeats at the end of the sequences facilitating intra-molecular recombination.

Base Sequence↗
PubMed2006

Complete plastid genome sequence of Daucus carota: implications for biotechnology and phylogeny of angiosperms.

BACKGROUND: Carrot (Daucus carota) is a major food crop in the US and worldwide. Its capacity for storage and its lifecycle as a biennial make it an attractive species for the introduction of foreign genes, especially for oral delivery of vaccines and other therapeutic proteins. Until recently efforts to express recombinant proteins in carrot have had limited success in terms of protein accumulation in the edible tap roots. Plastid genetic engineering offers the potential to overcome this limitation, as demonstrated by the accumulation of BADH in chromoplasts of carrot taproots to confer exceedingly high levels of salt resistance. The complete plastid genome of carrot provides essential information required for genetic engineering. Additionally, the sequence data add to the rapidly growing database of plastid genomes for assessing phylogenetic relationships among angiosperms. RESULTS: The complete carrot plastid genome is 155,911 bp in length, with 115 unique genes and 21 duplicated genes within the IR. There are four ribosomal RNAs, 30 distinct tRNA genes and 18 intron-containing genes. Repeat analysis reveals 12 direct and 2 inverted repeats > or = 30 bp with a sequence identity > or = 90%. Phylogenetic analysis of nucleotide sequences for 61 protein-coding genes using both maximum parsimony (MP) and maximum likelihood (ML) were performed for 29 angiosperms. Phylogenies from both methods provide strong support for the monophyly of several major angiosperm clades, including monocots, eudicots, rosids, asterids, eurosids II, euasterids I, and euasterids II. CONCLUSION: The carrot plastid genome contains a number of dispersed direct and inverted repeats scattered throughout coding and non-coding regions. This is the first sequenced plastid genome of the family Apiaceae and only the second published genome sequence of the species-rich euasterid II clade. Both MP and ML trees provide very strong support (100% bootstrap) for the sister relationship of Daucus with Panax in the euasterid II clade. These results provide the best taxon sampling of complete chloroplast genomes and the strongest support yet for the sister relationship of Caryophyllales to the asterids. The availability of the complete plastid genome sequence should facilitate improved transformation efficiency and foreign gene expression in carrot through utilization of endogenous flanking sequences and regulatory elements.

Amino Acid Sequence↗
PubMed2003

Phylogeny of plastids based on cladistic analysis of gene loss inferred from complete plastid genome sequences.

Based on the recent hypothesis on the origin of eukaryotic phototrophs, red algae, green plants, and glaucophytes constitute the "primary photosynthetic eukaryotes" (whose plastids may have originated directly from a cyanobacterium-like prokaryote via primary endosymbiosis), whereas the plastids of other lineages of eukaryotic phototrophs appear to be the result of secondary or tertiary endosymbiotic events (involving a phototrophic eukaryote and a host cell). Although phylogenetic analyses using multiple plastid genes from a wide range of eukaryotic lineages have been carried out, some of the major phylogenetic relationships of plastids remain ambiguous or conflict between different phylogenetic methods used for nucleotide or amino acid substitutions. Therefore, an alternative methodology to infer the plastid phylogeny is needed. Here, we carried out a cladistic analysis of the "loss of plastid genes" after primary endosymbiosis using complete plastid genome sequences from a wide range of eukaryotic phototrophs. Since it is extremely unlikely that plastid genes are regained during plastid evolution, we used the irreversible Camin-Sokal model for our cladistic analysis of the loss of plastid genes. The cladistic analysis of the 274 plastid protein-coding genes resolved the 20 operational taxonomic units representing a wide range of eukaryotic lineages (including three secondary plastid-containing groups) into two large monophyletic groups with high bootstrap values: one corresponded to the red lineage and the other consisted of a large clade composed of the green lineage (green plants and Euglena) and the basal glaucophyte plastid. Although the sister relationship between the green lineage and the Glaucophyta was not resolved in recent phylogenetic studies using amino acid substitutions from multiple plastid genes, it is consistent with the rbcL gene phylogeny and with a recent phylogenetic study using multiple nuclear genes. In addition, our analysis robustly resolved the conflicting/ambiguous phylogenetic positions of secondary plastids in previous phylogenetic studies: the Euglena plastid was sister to the chlorophycean (Chlamydomonas) lineage, and the secondary plastids from the diatom (Odontiella) and cryptophyte (Guillardia) were monophyletic within the red lineage.

Animals↗
PubMed2006

[Molecular characterization of full-length genome of Japanese encephalitis virus (02-76) newly isolated in China.].

BACKGROUND: To sequence and analyze the complete nucleotide sequence of the Japanese encephalitis virus (JEV) strain 02-76, newly isolated in 2002 in China and to provide information for the genomic structure of JEV and the characteristics of virulence. METHODS: Overlapping primers were designed according to the full-length genomes from GenBank. RT-PCR was used to amplify the fragments, sequencing was performed and all the nucleotides were connected to acquire the full-length genome. Computer software was used to analyze the nucleic acid data, deduced amino acid sequence and phylogenetic trees including Clustal X(1.8), DNASTAR, GENEDOC(3.2). RESULTS: The result of sequence analysis showed that the genome of 02-76 strain was 10,977 nucleotides long. An open reading frame from 95 to 10,391 including 10,296 bases was found capable of coding for a 3432 amino acid polyprotein. Compared with the Beijing 1 strains isolated in 1949 in China, there was a 248 nucleotide divergence and 16 amino acid divergence. Comparison of the complete genome sequences of different JEV isolates showed a 0.6%-15.1% nucleotide sequence divergence among them, which resulted in 0.2%-4.6% amino acid sequence divergence. Phylogenetic analysis through PrM/C,E,3'NTR and full-length genome showed that the 02-76 strain belonged to genotype 3. CONCLUSION: Analysis based on the complete genome sequences of different JEV isolates showed that the 02-76 isolate in 2002 belonged to genotype 3 and was close to the old Chinese isolates SA-14.

China↗
PubMed2000

Complete genomic RNA sequence of western equine encephalitis virus and expression of the structural genes.

The complete nucleotide sequence of the 71V-1658 strain of western equine encephalitis virus (WEE) was determined (minus 25 nucleotides from the 5' end). A 5' RACE reaction was used to sequence the 5' terminus from WEE strain CBA87. The deduced WEE genome was 11508 nucleotides in length, excluding the 5' cap nucleotide and 3' poly(A) tail. The nucleotide composition was 28% A, 25% C, 25% G and 22% U. Comparison with partial WEE sequences of strain 5614 (nsP2-nsP3 of the nonstructural region) and strain BFS1703 (26S structural region) revealed comparatively little variation; a total of 149 nucleotide differences in 8624 bases (1.7% divergence), of which only 28% (42 nucleotides) altered the encoded amino acids. Comparison of deduced nsP1 and nsP4 amino acid sequences from WEE with the corresponding proteins from eastern equine encephalitis virus (EEE) yielded identities of 84.9 and 83.8%, respectively. Previously uncharacterized stem-loop structures were identified in the nontranslated terminal regions. A cDNA clone of the 26S region encoding the structural polyprotein of WEE strain 71V-1658 was placed under the control of a cytomegalovirus promoter and transfected into tissue culture cells. The viral envelope proteins were functionally expressed in tissue culture, as determined by histochemical staining with monoclonal antibodies that recognize WEE antigens, thus, forming the initial step in the investigation of subunit vaccines to WEE.

5' Untranslated Regions↗
PubMed2003

Comparison of the complete mtDNA genome sequences of human cell lines--HL-60 and GM10742A--from individuals with pro-myelocytic leukemia and leber hereditary optic neuropathy, respectively, and the inclusion of HL-60 in the NIST human mitochondrial DNA standard reference material--SRM 2392-I.

Forensic and clinical laboratories benefit from DNA standard reference materials (SRMs) that provide the quality control and assurance that their results from sequencing unknown samples are correct. Therefore, the mitochondrial DNA (mtDNA) genome of HL-60, a promyelocytic leukemia cell line, has been completely sequenced by four laboratories and will be available to the forensic and medical communities in the spring of 2003; it will be called National Institute of Standards and Technology (NIST) SRM 2392-I. NIST human mtDNA SRM 2392 will continue to be available and includes the DNA from two apparently healthy individuals. Both SRM 2392 and 2392-I contain all the information (e.g. the sequences of 58 unique primer sets) needed to use these SRMs as positive controls for the amplification and sequencing any DNA. Compared to the templates in SRM 2392, the HL-60 mtDNA in SRM 2392-I has two tRNA differences and more polymorphisms resulting in amino acid changes. Four of these HL-60 mtDNA polymorphisms have been associated with Leber Hereditary Optic Neuropathy (LHON), one as an intermediate mutation and three as secondary mutations. The mtDNA from a cell line (GM10742A) from an individual with LHON was also completely sequenced for comparison and contained some of the same LHON mutations. The combination of these particular LHON associated mutations is also found in phylogenetic haplogroup J and its subset, J2, and may only be indicative that HL-60 belongs to haplogroup J, one of nine haplogroups that characterize Caucasian individuals of European descent or may mean that haplogroup J is more prone to LHON. Both these mtDNA SRMs will provide enhanced quality control in forensic identification, medical diagnosis, and single nucleotide polymorphism detection.

Journal Article↗
PubMed2001

Genome sequences and evolutionary biology, a two-way interaction.

Complete genome sequences are accumulating rapidly, culminating with the announcement of the human genome sequence in February 2001. In addition to cataloguing the diversity of genes and other sequences, genome sequences will provide the first detailed and complete data on gene families and genome organization, including data on evolutionary changes. Reciprocally, evolutionary biology will make important contributions to the efforts to understand functions of genes and other sequences in genomes. Large-scale, detailed and unbiased comparisons between species will illuminate the evolution of genes and genomes, and population genetics methods will enable detection of functionally important genes or sequences, including sequences that have been involved in adaptive changes.

Journal Article↗
PubMed2004

Complete sequence and evolutionary genomic analysis of the Pseudomonas aeruginosa transposable bacteriophage D3112.

Bacteriophage D3112 represents one of two distinct groups of transposable phage found in the clinically relevant, opportunistic pathogen Pseudomonas aeruginosa. To further our understanding of transposable phage in P. aeruginosa, we have sequenced the complete genome of D3112. The genome is 37,611 bp, with an overall G+C content of 65%. We have identified 53 potential open reading frames, including three genes (the c repressor gene and early genes A and B) that have been previously characterized and sequenced. The organization of the putative coding regions corresponds to published genetic and transcriptional maps and is very similar to that of enterobacteriophage Mu. In contrast, the International Committee on Taxonomy of Viruses has classified D3112 as a lambda-like phage on the basis of its morphology. Similarity-based analyses identified 27 open reading frames with significant matches to proteins in the NCBI databases. Forty-eight percent of these were similar to Mu-like phage and prophage sequences, including proteins responsible for transposition, transcriptional regulation, virion morphogenesis, and capsid formation. The tail proteins were highly similar to prophage sequences in Escherichia coli and phage Phi12 from Staphylococcus aureus, while proteins at the right end were highly similar to proteins in Xylella fastidiosa. We performed phylogenetic analyses to understand the evolutionary relationships of D3112 with respect to Mu-like versus lambda-like bacteriophages. Different results were obtained from similarity-based versus phylogenetic analyses in some instances. Overall, our findings reveal a highly mosaic structure and suggest that extensive horizontal exchange of genetic material played an important role in the evolution of D3112.

Bacteriophages↗
PubMed2005

Characterization and genetic variability of Hepatitis A virus genotype IIIA.

Molecular epidemiological studies of hepatitis A outbreaks in Norway showed the emergence of Hepatitis A virus (HAV) genotype IIIA in association with parenteral transmission among haemophiliacs and intravenous drug users. The complete genomic sequence of one of these outbreak isolates, NOR-21, was determined. This is the first complete genomic sequence of HAV genotype IIIA. Phylogenetic analysis showed that genotype IIIA/NOR-21 was genetically distinct from the other human and simian genotypes. Phylogenetic analysis of the nucleotide sequences clearly distinguished the different HAV genotypes, regardless of the genomic region used for analysis, whereas the amino acid sequences showed a more vague distinction between human HAV genotypes I and II. In particular, the inferred phylogeny based on the capsid proteins showed that the human HAV strains were related more closely to each other than to the simian strains. The greatest variability and clearest distinction between genotypes were observed for the polymerase gene. The outbreak isolates of HAV genotype IIIA in this study showed greater nucleotide variability than is generally seen in outbreaks of genotype I. This high nucleotide variability, which may be characteristic of this HAV genotype, the mode of transmission in this outbreak or parallel introductions, is discussed.

Animals↗
PubMed2004

Comparative genomic hybridization provides new insights into the molecular taxonomy of the Saccharomyces sensu stricto complex.

The science of taxonomy is constantly improving as new techniques are developed. Current practice is to construct phylogenetic trees based on the analysis of the DNA sequence of single genes, or parts of single genes. However, this approach has recently been brought into question as several tree topologies may be produced for the same clade when the sequences for various different genes are used. The availability of complete genome sequences for several organisms has seen the adoption of microarray technology to construct molecular phylogenies of bacteria, based on all of the genes. Similar techniques have been used to reveal the relationships between different strains of the yeast Saccharomyces cerevisiae. We have exploited microarray technology to construct a molecular phylogeny for the Saccharomyces sensu stricto complex of yeast species, which is based on all of the protein-encoding genes revealed by the complete genome sequence of the paradigmatic species, S. cerevisiae. We also analyze different strains of S. cerevisiae itself, as well as the putative species S. boulardii. We show that in addition to the phylogeny produced, we can identify and analyze individual ORF traits and interpret the results to give a detailed explanation of evolutionary events underlying the phylogeny.

Classification↗
PubMed1995

Genome sequence comparison and scenarios for gene rearrangements: a test case.

As large portions of related genomes are being sequenced, methods for comparing complete or nearly complete genomes, as opposed to comparing individual genes, are becoming progressively more important. A major, widespread phenomenon in genome evolution is the rearrangement of genes and gene blocks. There is, however, no consistent method for genome sequence comparison combined with the reconstruction of the evolutionary history of highly rearranged genomes. We developed a schema for genome sequence comparison that includes three successive steps: (i) comparison of all proteins encoded in different genomes and generation of genomic similarity plots; (ii) construction of an alphabet of conserved genes and gene blocks; and (iii) generation of most parsimonious genome rearrangement scenarios. The approach is illustrated by a comparison of the herpesvirus genomes that constitute the largest set of relatively long, complete genome sequences available to date. Herpesviruses have from 70 to about 200 genes; comparison of the amino acid sequences encoded in these genes results in an alphabet of about 30 conserved genes comprising 7 conserved blocks that are rearranged in the genomes of different herpesviruses. Algorithms to analyze rearrangements of multiple genomes were developed and applied to the derivation of most parsimonious scenarios of herpesvirus evolution under different evolutionary models. The developed approaches to genome comparison will be applicable to the comparative analysis of bacterial and eukaryotic genomes as soon as their sequences become available.

DNA, Viral↗
PubMed2004

Sequencing strategies for parasite genomes.

Recent advances in the field of sequencing have enabled the determination of the complete nucleotide sequence of a large number of complex genomes. The complete genome sequence of the parasite Plasmodium falciparum has been published recently, and many other parasite genome initiatives are underway. Parasite genomes vary in size, nucleotide composition, polymorphism level, content, and distribution of repetitive elements. These genomic features affect the performance of sequencing strategies. As a consequence, each of the ongoing parasite genome projects has adopted distinct sequencing approaches. The degree of completeness and accuracy desired as well as available funds should be considered carefully when choosing the most appropriate sequencing strategy.

Animals↗