Displaying publications 1 - 20 of 50 in total

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  1. Pérolat P, Grimont F, Regnault B, Grimont PA, Fournié E, Thevenet H, et al.
    Res. Microbiol., 1990 Feb;141(2):159-71.
    PMID: 2189169
    A total of 67 serovar reference strains and 7 isolates belonging to the genus Leptospira were characterized by ribosomal ribonucleic acid (rRNA) gene restriction patterns. Fifty patterns were observed. Strains belonging to different genomic species always gave different patterns. However, genomic species were subdivided into several patterns. Forty-three serovars gave a specific pattern. Some serovars could not be separated by rRNA gene restriction patterns: strains of serovars icterohaemorrhagiae, copenhageni, lai, pyrogenes and jalna gave pattern 1; serovars birkini, mankarso and wolffi gave pattern 4; serovars canicola, gem, hebdomadis, pomona and hardjo (strain hardjoprajitno) gave pattern 12; serovars valbuzzi and zanoni gave pattern 14; serovars jonsis, malaya and sumneri gave pattern 16; serovars arborea, ballum, castellonis and kenya gave pattern 35; and serovars borincana and shermani gave pattern 43. These data provide the bases for a molecular typing system for the genus Leptospira.
    Matched MeSH terms: RNA, Ribosomal/genetics*
  2. Canning EU, Curry A, Cheney S, Lafranchi-Tristem NJ, Haque MA
    Parasitology, 1999 Sep;119 ( Pt 3):273-86.
    PMID: 10503253
    The microsporidian genus Nosema is characterized by development in direct control with host cell cytoplasm, diplokaryotic nuclei throughout development and disporous sporogony. The genus Vairimorpha exhibits the same features plus an octoporous sporogony producing uninucleate spores in a sporophorous vesicle. A microsporidium from diamondback moth, Plutella xylostella, falls between Nosema and Vairimorpha in that it initiates but fails to complete the octosporous sequence in this host. The name Vairimorpha imperfecta n.sp. is proposed. Merogony is mainly by formation of buds from multinucleate meronts, the buds remaining attached in chains. Diplokaryotic spores measure 4.3 x 2.0 microns (fresh) and have 15.5 coils of the polar tube in 1 rank. The octosporous sporogony is aborted owing to irregular formation of nuclear spindles, incomplete cytoplasmic fission and bizarre deposition of electron-dense episporontal secretions. Phylogenetic analyses of the sequences of the small subunit rRNA genes of V. imperfecta and of several Nosema and Vairimorpha spp. place V. imperfecta in a clade with Nosema spp. from Lepidoptera rather than in the clade containing the more typical species of Vairimorpha. It is suggested that the ancestors of the Vairimorpha/Nosema complex of species exhibited both disporous and octosporous sporogonies, as does the type species of Vairimorpha, Vairimorpha necatrix. It would follow that true Nosema spp. have lost the ability to express an octosporous sequence and that V. imperfecta is in the process of losing it. It is proposed that the genera Nosema and Vairimorpha be placed in the same family Nosematidae Labbé 1899, rather than in separate families and orders as at present.
    Matched MeSH terms: RNA, Ribosomal/genetics
  3. Matsui M, Kuraishi N, Eto K, Hamidy A, Nishikawa K, Shimada T, et al.
    Mol Phylogenet Evol, 2016 09;102:305-19.
    PMID: 27374495 DOI: 10.1016/j.ympev.2016.06.009
    A fanged frog Limnonectes kuhlii was once thought to be wide-ranging in Southeast Asia, but is now confined to its type locality Java through recent phylogenetic studies, which clarified heterospecific status of non-Javanese populations, and monophyly of Bornean populations. However, large genetic differences among Bornean populations suggest occurrence of cryptic species, which we test using dense geographic sampling. We estimated the phylogenetic relationships among samples of Bornean populations together with their putative relatives from the continental Southeast Asia, using 2517bp sequences of the 12S rRNA, tRNA(val), and 16S rRNA of mitochondrial DNA, and 2367bp sequences of the NCX1, POMC, and RAG1 of nuclear genes. In the mtDNA trees, Bornean L. kuhlii-like frogs formed a monophyletic group split into 18 species lineages including L. hikidai, with the deepest phylogenetic split separating L. cintalubang from the remaining species. Almost all of these lineages co-occur geographically, and two to three lineages were found syntopically in each locality. Co-occurrence of more than one lineage may be maintained by differential morphology and microhabitat selection. These syntopic lineages should be regarded as distinct species. Our results clearly indicate that taxonomic revision is urgent to clarify many evolutionary problems of Bornean L. kuhlii-like frogs.
    Matched MeSH terms: RNA, Ribosomal/genetics
  4. Ho CL, Lee WK, Lim EL
    Genomics, 2018 03;110(2):124-133.
    PMID: 28890206 DOI: 10.1016/j.ygeno.2017.09.003
    Agar and agarose have wide applications in food and pharmaceutical industries. Knowledge on the genome of red seaweeds that produce them is still lacking. To fill the gap in genome analyses of these red algae, we have sequenced the nuclear and organellar genomes of an agarophyte, Gracilaria changii. The partial nuclear genome sequence of G. changii has a total length of 35.8Mb with 10,912 predicted protein coding sequences. Only 39.4% predicted proteins were found to have significant matches to protein sequences in SwissProt. The chloroplast genome of G. changii is 183,855bp with a total of 201 open reading frames (ORFs), 29 tRNAs and 3 rRNAs predicted. Five genes: ssrA, leuC and leuD CP76_p173 (orf139) and pbsA were absent in the chloroplast genome of G. changii. The genome information is valuable in accelerating functional studies of individual genes and resolving evolutionary relationship of red seaweeds.
    Matched MeSH terms: RNA, Ribosomal/genetics
  5. Tan MH, Gan HM, Lee YP, Austin CM
    PMID: 25103431 DOI: 10.3109/19401736.2014.947587
    The mitochondrial genome sequence of the stone crab, Myomenippe fornasinii, second of the superfamily Eriphioidea is documented. Myomenippe fornasinii has a mitogenome of 15,658 base pairs consisting of 13 protein-coding genes, 2 ribosomal subunit genes, 22 transfer RNAs and a non-coding AT-rich region. The base composition of the M. fornasinii mitogenome is 36.10% for T, 18.52% for C, 35.48% for A, and 9.90% for G, with an AT bias of 71.58%. The mitogenome gene order conforms to what is the standard arrangement for brachyuran crabs.
    Matched MeSH terms: RNA, Ribosomal/genetics
  6. Gan HY, Gan HM, Lee YP, Austin CM
    PMID: 25693708 DOI: 10.3109/19401736.2015.1007311
    The mitochondrial genome of the rock pool prawn (Palaemon serenus), is sequenced, making it the third for genera of the family Palaemonidae and the first for the genus Palaemon. The mitogenome is 15,967 base pairs in length and comprises 13 protein-coding genes, 2 ribosomal subunit genes, 22 transfer RNAs and a non-coding AT-rich region. The P. serenus mitogenome has an AT bias of 58.97% and a base composition of 29.79% for T, 24.14% for C, 29.18% for A, and 16.89% for G. The mitogenome gene order of P. serenus is identical to Exopalaemon carinicauda.
    Matched MeSH terms: RNA, Ribosomal/genetics
  7. Gan HM, Gan HY, Lee YP, Grandjean F, Austin CM
    PMID: 25648916 DOI: 10.3109/19401736.2015.1007326
    The invasive freshwater crayfish Orconectes limosus mitogenome was recovered by genome skimming. The mitogenome is 16,223 base pairs in length consisting of 13 protein-coding genes, 2 ribosomal subunit genes, 22 transfer RNAs, and a non-coding AT-rich region. The O. limosus mitogenome has an AT bias of 71.37% and base composition of 39.8% for T, 10.3% for C, 31.5% for A, and 18.4% for G. The mitogene order is identical to two other genera of northern hemisphere crayfish that have been sequenced for this organelle.
    Matched MeSH terms: RNA, Ribosomal/genetics
  8. Austin CM, Tan MH, Gan HY, Gan HM
    Mitochondrial DNA A DNA Mapp Seq Anal, 2016 11;27(6):4176-4177.
    PMID: 25630729
    Next-Gen sequencing was used to recover the complete mitochondrial genome of Cherax tenuimanus. The mitogenome consists of 15,797 base pairs (68.14% A + T content) containing 13 protein-coding genes, two ribosomal subunit genes, 22 transfer RNAs, and a 779 bp non-coding AT-rich region. Mitogenomes have now been recovered for all six species of Cherax native to Western Australia.
    Matched MeSH terms: RNA, Ribosomal/genetics
  9. Austin CM, Tan MH, Lee YP, Croft LJ, Meekan MG, Gan HM
    PMID: 25103432 DOI: 10.3109/19401736.2014.947586
    The complete mitogenome of the ray Pastinachus atrus was recovered from a partial genome scan using the HiSeq sequencing system. The P. atrus mitogenome has 18,162 base pairs (61% A + T content) made up of 13 protein-coding genes, 2 ribosomal subunit genes, 22 transfer RNAs, and a 2516 bp non-coding AT-rich region. This mitogenome sequence is the first for a ray from Australian waters, the first for the Genus Pastinachus, and the 6th for the family Dasyatidae.
    Matched MeSH terms: RNA, Ribosomal/genetics
  10. Austin CM, Tan MH, Croft LJ, Meekan MG, Gan HY, Gan HM
    PMID: 25693694 DOI: 10.3109/19401736.2015.1007348
    The complete mitogenome of the ray Taeniura lymma was recovered from genome skimming using the HiSeq sequencing system. The T. lymma mitogenome has 17,652 base pairs (59.13% A + T content) made up of 13 protein-coding genes, 2 ribosomal subunit genes, 22 transfer RNAs and a 1906 bp non-coding AT-rich region. This mitogenome sequence is the second for a ray from Australian waters, the first for the genus Taeniura and the ninth for the family Dasyatidae.
    Matched MeSH terms: RNA, Ribosomal/genetics
  11. Gan HM, Tan MH, Gan HY, Lee YP, Austin CM
    PMID: 25648918 DOI: 10.3109/19401736.2015.1007325
    The clawed lobster Nephrops norvegicus is an important commercial species in European waters. We have sequenced the complete mitochondrial genome of the species from a partial genome scan using Next-Gen sequencing. The N. norvegicus has a mitogenome of 16,132 base pairs (71.22% A+ T content) comprising 13 protein-coding genes, 2 ribosomal subunit genes, 21 transfer RNAs, and a putative 1259 bp non-coding AT-rich region. This mitogenome is the second fully characterized for the family Nephropidae and the first for the genus Nephrops. The mitogenome gene order is identical to the Maine lobster, Homarus americanus with the exception of the possible loss of the trnI gene.
    Matched MeSH terms: RNA, Ribosomal/genetics
  12. Gan HM, Tan MH, Austin CM
    PMID: 24617484 DOI: 10.3109/19401736.2014.895996
    The complete mitochondrial genome of the conservationally significant Macquarie perch (Macquaria australasica) was obtained from low-coverage shotgun sequencing using the MiSeq sequencer. The M. australasica mitogenome has 16,496 base pairs (55% A + T content) made up of 13 protein-coding genes, 2 ribosomal subunit genes, 22 transfer RNAs, and a 819 bp non-coding AT-rich region. This is the first mitogenome sequence for the genus Macquaria, and the third to be reported for the family Percichthyidae.
    Matched MeSH terms: RNA, Ribosomal/genetics
  13. Gan HY, Gan HM, Lee YP, Austin CM
    PMID: 25693707 DOI: 10.3109/19401736.2015.1007312
    The mitochondrial genome sequence of the Australian freshwater shrimp, Paratya australiensis, is presented, which is the fourth for genera of the superfamily Atyoidea and the first atyid from the southern hemisphere. The base composition of the P. australiensis, mitogenome is 33.55% for T, 18.24% for C, 35.16% for A, and 13.06% for G, with an AT bias of 71.58%. It has a mitogenome of 15,990 base pairs comprised of 13 protein-coding, 2 ribosomal subunit and 22 transfer RNAs genes and a non-coding AT-rich region. The mitogenome gene order for the species is typical for atyid shrimps, which conform to the primitive pan crustacean model.
    Matched MeSH terms: RNA, Ribosomal/genetics
  14. Matsui M, Yambun P, Sudin A
    Zoolog Sci, 2007 Nov;24(11):1159-66.
    PMID: 18348617 DOI: 10.2108/zsj.24.1159
    Examination of types and recently collected specimens revealed that Ansonia anotis Inger, Tan, and Yambun, 2001 and Pedostibes maculatus (Mocquard, 1890), both described from Kinabalu, Sabah, Malaysia, are hardly differentiated morphologically. Analyses of a total of 2,427 bp of the 12S rRNA, tRNA(val), and 16S mitochondrial rRNA genes revealed that the two species are very close genetically. Thus A. anotis is regarded as conspecific and is synonymized with P. maculatus. Genetically, this species proved to form a lineage distinct from other bufonids from Southeast Asia, including species of Ansonia and Pedostibes. Because the species has also some unique morphological traits different from known bufonid genera, we propose to establish a new genus for Nectophryne maculata Mocquard, 1890.
    Matched MeSH terms: RNA, Ribosomal/genetics
  15. Tan JL, Ngeow YF, Choo SW
    J Clin Microbiol, 2015 Sep;53(9):3042-6.
    PMID: 26157149 DOI: 10.1128/JCM.00541-15
    Mycobacterium abscessus subspecies classification has important clinical implications. We used phylogenomic network and amino acid analyses to provide evidence for the separation of Mycobacterium bolletii and Mycobacterium massiliense into two distinct subspecies which can potentially be differentiated rapidly by their protein signatures.
    Matched MeSH terms: RNA, Ribosomal/genetics
  16. Vadivelu J, Puthucheary SD, Drasar BS, Dance DA, Pitt TL
    Trop Med Int Health, 1998 Jul;3(7):518-21.
    PMID: 9705184
    The constancy of strain genotypes of multiple isolates of Burkholderia pseudomallei from 13 patients with melioidosis was examined by BamHI ribotyping and pulsed-field gel electrophoresis (PFGE) of XbaI digests of DNA. Seven of 8 patients with single episodes of melioidosis each yielded genetically identical isolates and only one of five patients with recurrent episodes was infected with a new strain clearly distinct from the original primary strain. Variation was observed in PFGE patterns of primary and relapse isolates of another patient but this was insufficient to define genetically distinct strains. We conclude that most patients with single or multiple episodes of melioidosis retain a single strain.
    Matched MeSH terms: RNA, Ribosomal/genetics
  17. Lee YI, Yap JW, Izan S, Leitch IJ, Fay MF, Lee YC, et al.
    BMC Genomics, 2018 Aug 02;19(1):578.
    PMID: 30068293 DOI: 10.1186/s12864-018-4956-7
    BACKGROUND: Satellite DNA is a rapidly diverging, largely repetitive DNA component of many eukaryotic genomes. Here we analyse the evolutionary dynamics of a satellite DNA repeat in the genomes of a group of Asian subtropical lady slipper orchids (Paphiopedilum subgenus Parvisepalum and representative species in the other subgenera/sections across the genus). A new satellite repeat in Paphiopedilum subgenus Parvisepalum, SatA, was identified and characterized using the RepeatExplorer pipeline in HiSeq Illumina reads from P. armeniacum (2n = 26). Reconstructed monomers were used to design a satellite-specific fluorescent in situ hybridization (FISH) probe. The data were also analysed within a phylogenetic framework built using the internal transcribed spacer (ITS) sequences of 45S nuclear ribosomal DNA.

    RESULTS: SatA comprises c. 14.5% of the P. armeniacum genome and is specific to subgenus Parvisepalum. It is composed of four primary monomers that range from 230 to 359 bp and contains multiple inverted repeat regions with hairpin-loop motifs. A new karyotype of P. vietnamense (2n = 28) is presented and shows that the chromosome number in subgenus Parvisepalum is not conserved at 2n = 26, as previously reported. The physical locations of SatA sequences were visualised on the chromosomes of all seven Paphiopedilum species of subgenus Parvisepalum (2n = 26-28), together with the 5S and 45S rDNA loci using FISH. The SatA repeats were predominantly localisedin the centromeric, peri-centromeric and sub-telocentric chromosome regions, but the exact distribution pattern was species-specific.

    CONCLUSIONS: We conclude that the newly discovered, highly abundant and rapidly evolving satellite sequence SatA is specific to Paphiopedilum subgenus Parvisepalum. SatA and rDNA chromosomal distributions are characteristic of species, and comparisons between species reveal that the distribution patterns generate a strong phylogenetic signal. We also conclude that the ancestral chromosome number of subgenus Parvisepalum and indeed of all Paphiopedilum could be either 2n = 26 or 28, if P. vietnamense is sister to all species in the subgenus as suggested by the ITS data.

    Matched MeSH terms: RNA, Ribosomal/genetics
  18. Kissinger JC, Collins WE, Li J, McCutchan TF
    J Parasitol, 1998 Apr;84(2):278-82.
    PMID: 9576499
    Plasmodium inui (Halberstaedter and von Prowazek, 1907), a malarial parasite of Old World monkeys that occurs in isolated pockets throughout the Celebes, Indonesia, Malaysia, and the Philippines, has traditionally been considered to be related more closely to Plasmodium malariae of humans (and its primate counterpart Plasmodium brasilianum), than to other primate Plasmodium species. This inference was made in part because of the similarities in the periodicities or duration of the asexual cycle in the blood, the extended sporogonic cycle, and the longer period of time for development of the pre-erythrocytic stages in the liver. Both P. inui and P. malariae have quartan (72 hr) periodicities associated with their asexual cycle, whereas other primate malarias, such as Plasmodium fragile and Plasmodium cynomolgi, are associated with tertian periodicities (48 hr), and Plasmodiumn knowlesi, with a quotidian (24 hr) periodicity. Phylogenetic analyses of portions of orthologous small subunit ribosomal genes reveal that P. inui is actually more closely related to the Plasmodium species of the "vivax-type" lineage than to P. malariae. Ribosomal sequence analysis of many different, geographically isolated, antigenically distinct P. inui isolates reveals that the isolates are nearly identical in sequence and thus members of the same species.
    Matched MeSH terms: RNA, Ribosomal/genetics
  19. Vun VF, Mahani MC, Lakim M, Ampeng A, Md-Zain BM
    Genet. Mol. Res., 2011;10(1):368-81.
    PMID: 21365553 DOI: 10.4238/vol10-1gmr1048
    Little is known about the classification and phylogenetic relationships of the leaf monkeys (Presbytis). We analyzed mitochondrial DNA sequences of cytochrome b (Cyt b) and 12S rRNA to determine the phylogenetic relationships of the genus Presbytis. Gene fragments of 388 and 371 bp of Cyt b and 12S rRNA, respectively, were sequenced from samples of Presbytis melalophos (subspecies femoralis, siamensis, robinsoni, and chrysomelas), P. rubicunda and P. hosei. The genus Trachypithecus (Cercopithecidae) was used as an outgroup. The Cyt b NJ and MP phylogeny trees showed P. m. chrysomelas to be the most primitive, followed by P. hosei, whereas 12S rRNA tree topology only indicated that these two species have close relationships with the other members of the genus. In our analysis, chrysomelas, previously classified as a subspecies of P. melalophos, was not included in either the P. m. femoralis clade or the P. m. siamensis clade. Whether or not there should be a separation at the species level remains to be clarified. The tree topologies also showed that P. m. siamensis is paraphyletic with P. m. robinsoni, and P. m. femoralis with P. rubicunda, in two different clades. Cyt b and 12S rRNA are good gene candidates for the study of phylogenetic relationships at the species level. However, the systematic relationships of some subspecies in this genus remain unclear.
    Matched MeSH terms: RNA, Ribosomal/genetics*
  20. Seelan JS, Justo A, Nagy LG, Grand EA, Redhead SA, Hibbett D
    Mycologia, 2015 May-Jun;107(3):460-74.
    PMID: 25661717 DOI: 10.3852/14-084
    The genus Lentinus (Polyporaceae, Basidiomycota) is widely documented from tropical and temperate forests and is taxonomically controversial. Here we studied the relationships between Lentinus subg. Lentinus sensu Pegler (i.e. sections Lentinus, Tigrini, Dicholamellatae, Rigidi, Lentodiellum and Pleuroti and polypores that share similar morphological characters). We generated sequences of internal transcribed spacers (ITS) and partial 28S regions of nuc rDNA and genes encoding the largest subunit of RNA polymerase II (RPB1), focusing on Lentinus subg. Lentinus sensu Pegler and the Neofavolus group, combined these data with sequences from GenBank (including RPB2 gene sequences) and performed phylogenetic analyses with maximum likelihood and Bayesian methods. We also evaluated the transition in hymenophore morphology between Lentinus, Neofavolus and related polypores with ancestral state reconstruction. Single-gene phylogenies and phylogenies combining ITS and 28S with RPB1 and RPB2 genes all support existence of a Lentinus/Polyporellus clade and a separate Neofavolus clade. Polyporellus (represented by P. arcularius, P. ciliatus, P. brumalis) forms a clade with species representing Lentinus subg. Lentinus sensu Pegler (1983), excluding L. suavissimus. Lentinus tigrinus appears as the sister group of Polyporellus in the four-gene phylogeny, but this placement was weakly supported. All three multigene analyses and the single-gene analysis using ITS strongly supported Polyporus tricholoma as the sister group of the Lentinus/Polyporellus clade; only the 28S rRNA phylogeny failed to support this placement. Under parsimony the ancestral hymenophoral configuration for the Lentinus/Polyporellus clade is estimated to be circular pores, with independent transitions to angular pores and lamellae. The ancestral state for the Neofavolus clade is estimated to be angular pores, with a single transition to lamellae in L. suavissimus. We propose that Lentinus suavissimus (section Pleuroti) should be reclassified as Neofavolus suavissimus comb. nov.
    Matched MeSH terms: RNA, Ribosomal/genetics
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