• Title/Summary/Keyword: De novo assembly

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Knockdown of Archvillin by siRNA Inhibits Myofibril Assembly in Cultured Skeletal Myoblast

  • Lee, Yeong-Mi;Kim, Hyun-Suk;Choi, Jun-Hyuk;Choi, Jae-Kyoung;Joo, Young-Mi;Ahn, Seung-Ju;Min, Byung-In;Kim, Chong-Rak
    • Biomedical Science Letters
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    • v.13 no.4
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    • pp.251-261
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    • 2007
  • A myofiber of skeletal muscle is composed of myofibrils, sarcolemma (plasma membrane), and constameres, which anchor the myofibrils to the sarcolemma. Achvillin is a recently identified F-actin binding muscle protein, co-isolates with dystrophin and caveolin-3 in low-density sarcolemma of striated muscle, and colocalizes with dystrophin at costameres, the specialized adhesion sites in muscle. Archvillin also binds to nebulin and localizes at myofibrillar Z-discs, the lateral boundaries of the sarcomere in muscle. However other roles of archvillin on the dynamics of myofibrillogenesis remain to be defined. The goal of this study is, by using siRNA-mediated gene silencing technique, to investigate the effect of archvillin on the dynamics of myofibrillogenesis in cell culture of a mouse skeletal myogenic cell line (C2C12), where presumptive myoblasts withdraw from the cell cycle, fuse, undergo de novo myofibrillogenesis, and differentiate into mature myotubes. The roles of archvillin in the assembly and maintenance of myofibril and during the progression of myofibrillogenesis induced in skeletal myoblast following gene silencing in the cell culture were investigated. Fluorescence microscopy demonstrated that the distribution of archvillin was changed along the course of myofibril assembly with nebulin, vinculin and F-actin and then located at Z-lines with nebulin. Fluorescence microscopy demonstrated that knockdown of mouse archvillin expression led to an impaired assembly of new myofibrillar clusters and delayed fusion and myofibrillogenesis although the mouse archvillin siRNA did not affect those expressions of archvillin binding proteins, such as nebulin and F-actin. This result is corresponded with that of RT-PCR and western blots. When the perturbed archvillin was rescued by co-transfection with GFP or Red tagged human archvillin construct, the inhibited cell fusion and myotube formation was recovered. By using siRNA technique, archvillin was found to be involved in early stage of myofibrillogenesis. Therefore, the current data suggest the idea that archvillin plays critical roles on cell fusion and dynamic myofibril assembly.

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De novo genome assembly and single nucleotide variations for Soybean yellow common mosaic virus using soybean flower bud transcriptome data

  • Jo, Yeonhwa;Choi, Hoseong;Kim, Sang-Min;Lee, Bong Choon;Cho, Won Kyong
    • Journal of Applied Biological Chemistry
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    • v.63 no.3
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    • pp.189-195
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    • 2020
  • The soybean (Glycine max L.), also known as the soya bean, is an economically important legume species. Pathogens are always major threats for soybean cultivation. Several pathogens negatively affect soybean production. The soybean is also known as a susceptible host to many viruses. Recently, we carried out systematic analyses to identify viruses infecting soybeans using soybean transcriptome data. Our screening results showed that only few soybean transcriptomes contained virus-associated sequences. In this study, we further carried out bioinformatics analyses using a soybean flower bud transcriptome for virus identification, genome assembly, and single nucleotide variations (SNVs). We assembled the genome of Soybean yellow common mosaic virus (SYCMV) isolate China and revealed two SNVs. Phylogenetic analyses using three viral proteins suggested that SYCMV isolate China is closely related to SYCMV isolates from South Korea. Furthermore, we found that replication and mutation of SYCMV is relatively low, which might be associated with flower bud tissue. The most interesting finding was that SYCMV was not detected in the cytoplasmic male sterility (CMS) line derived from the non-CMS line that was severely infected by SYCMV. In summary, in silico analyses identified SYCMV from the soybean flower bud transcriptome, and a nearly complete genome of SYCMV was successfully assembled. Our results suggest that the low level of virus replication and mutation for SYCMV might be associated with plant tissues. Moreover, we provide the first evidence that male sterility might be used to eliminate viruses in crop plants.

Marine Metatranscriptome Profiling in the Sea Adjacent to Jeju Island, Korea, by RNA-sequencing (RNA-sequencing을 이용한 제주도 인접 바다의 메타전사체 프로파일링)

  • Hwang, Jinik;Kang, Mingyeong;Kim, Kang Eun;Jung, Seung Won;Lee, Taek-Kyun
    • Journal of Life Science
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    • v.30 no.7
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    • pp.625-629
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    • 2020
  • The Ocean is a rich source of diverse living organisms include viruses. In this study, we examined the microbial communities in the sea adjacent to Jeju Island in two seasons by metatranscriptomics. We collected and extracted total RNA, and, using the next-generation sequencing HiSeq 2000 and de novo transcriptome assembly, we identified 652,984 and 163,759 transcripts from the March and December samples, respectively. The most abundant organisms in March were bacteria, while eukaryotes were dominant in the December sample. The bacterial communities differed between the two samples, suggesting seasonal change. To identify the viruses, we searched the transcripts against a viral reference database using MegaBLAST with the most identified being bacteriophages infecting the marine bacteria. However, we also revealed an abundance of transcripts associated with diverse herpesviruses in the two transcriptomes, indicating the presence or possible threat of infection of fish in the sea around Jeju Island. This data is valuable for the study of marine microbial communities and for identifying possible viral pathogens.

Development and Genetic Diversity Analysis of Microsatellite Markers Using Next-generation Sequencing in Seriola quinqueradiata (차세대 염기서열 분석법을 이용한 방어(Seriola quinqueradiata)의 microsatellite 마커의 개발 및 유전적 특성 분석)

  • Dong, Chun Mae;Lee, Mi-Nan;Kim, Eun-Mi;Park, Jung Youn;Kim, Gun-Do;Noh, Jae Koo
    • Journal of Life Science
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    • v.30 no.3
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    • pp.291-297
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    • 2020
  • This study was conducted to develop microsatellite markers in Seriola quinqueradiata using next-generation sequencing. A total of 28,873,374 reads were generated on an Illumina Hiseq2500 system, yielding 7,247,216,874 bp sequences. The de novo assembly resulted in 466,359 contigs. A total of 132 contigs (0.43%), including 60 microsatellite loci, were derived from 30,729 contigs longer than 518 bp. A total of 60 primer sets were designed from the 132 microsatellite loci. A total of 15 polymorphic nuclear microsatellite loci were chosen to evaluate population genetic parameters in the parents and offspring. The mean number of effective alleles was 18.5, ranging from 11 to 30. The observed heterozygosity (HO) and expected heterozygosity (HE) ranged between 0.431 and 0.972 with an average of 0.812 and from 0.782 to 0.949 with an average of 0.896, respectively. No significant linkage disequilibrium was observed after Bonferroni revision in any loci. The results show that the 15 polymorphic nuclear microsatellite markers can be used to study the population and conservation genetics of S. quinqueradiata in Korea. To ensure the success of artificial seedling production technology, genetic variations between the parent and offspring populations should be monitored, and inbreeding should be controlled.

Identification and Characterization of Polymorphic Microsatellite DNA Markers Using Next-generation Sequencing in Parapristipoma trilineatum (차세대 염기서열 분석법을 사용한 벤자리(Parapristipoma trilineatum)의 microsatellite 마커의 개발 및 유전학적 특성 분석)

  • Chun Mae Dong;Mi-Nan Lee;Jae Koo Noh;Jin Woo Park;Young-Ok Kim;Eun-Mi Kim
    • Journal of Life Science
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    • v.33 no.8
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    • pp.623-631
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    • 2023
  • This study was conducted to develop microsatellite markers in Parapristipoma trilineatum using next-generation sequencing. A total of 402,244,934 reads were generated on the Illumina Hiseq X Ten System, yielding 60,738,985,034 bp of sequences. The de novo assembly resulted in 1,320,995 contigs. A total of 952,326 contigs (0.016%) including 151 microsatellite loci were derived from the 1,320,995 contigs longer than 640 bp. A total of 34 primer sets were designed from the 151 microsatellite loci. As a result, 15 microsatellite loci were chosen and used for assuming population genetic parameters in the wild and farmed populations. The mean number of effective alleles was 12, ranging from 6 to 25. The observed heterozygosity (HO) and the expected heterozygosity (HE) ranged between 0.530 and 0.873, with an average of 0.750, and from 0.647 to 0.895, with an average of 0.793, respectively. According to these results, the developed set of 15 microsatellite markers is expected to be useful for the analysis of genetic characteristics in the population of P. trilineatum in Korea. There are requirements now for further genetic information, fishery resource management, breeding guidelines, support with the selection of breeds and studies on the effects of release, all of which will improve species conservation, and through future research, we aim to offer genetic foundational data with that goal.

Analysis of the chloroplast genome and SNP detection in a salt tolerant breeding line in Korean ginseng

  • Jo, Ick-Hyun;Bang, Kyong-Hwan;Hong, Chi Eun;Kim, Jang-Uk;Lee, Jung-Woo;Kim, Dong-Hwi;Hyun, Dong-Yun;Ryu, Hojin;Kim, Young-Chang
    • Journal of Plant Biotechnology
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    • v.43 no.4
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    • pp.417-421
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    • 2016
  • The complete chloroplast genome sequence of Panax ginseng breeding line 'G07006', showing higher salt tolerance, was confirmed by de novo assembly using whole genome next-generation sequences. The complete chloroplast (CP) genome size is 156,356 bp, including two inverted repeats (IRs) of 52,060 bp, separated by the large single-copy (LSC 86,174 bp) and the small single-copy (SSC 18,122 bp) regions. One hundred fourteen genes were annotated, including 80 protein-coding genes, 30 tRNA genes, and 4 rRNA genes. Among them, 18 sites were duplicated in the inverted repeat regions. By comparative analyses of the previously identified CP genome sequences of nine cultivars of P. ginseng and that of G07006, five useful SNPs were defined in this study. Since three of the five SNPs were cultivar-specific to Chunpoong and Sunhyang, they could be easily used for distinguishing from other ginseng accessions. However, on arranging SNPs according to their gene location, the G07006 genotype was 'GTGGA', which was distinct from other accessions. This complete chloroplast DNA sequence could be conducive to discrimination of the line G07006 (salt-tolerant) and further enhancement of the genetic improvement program for this important medicinal plant.

Current status and prospects to identify mutations responsible for mutant phenotypes by using NGS technology (NGS 기술 활용 돌연변이체 해석 및 연구현황)

  • Jung, Yu Jin;Ryu, Ho Jin;Cho, Yong-Gu;Kang, Kwon Kyoo
    • Journal of Plant Biotechnology
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    • v.43 no.4
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    • pp.411-416
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    • 2016
  • Next-generation sequencing allows the identification of mutations responsible for mutant phenotypes by whole-genome resequencing and alignment to a reference genome. However, when the resequenced cultivar/line displays significant structural variation from the reference genome, mutations in the genome regions absent in the reference cannot be identified by simple alignment. In this review, we report the current status and prospects in identification of genes in mutant phenotypes, by using the methods MutMap, MutMap-Gap, and MutMap+. These methods delineate a candidate region harboring a mutation of interest, followed by de novo assembly, alignment, and identification of the mutation within genome gaps. These methods are likely to prove useful for cloning genes that exhibit significant structural variations, such as disease resistance genes of the nucleotide-binding site-leucine rich repeat (NBS-LRR) class.

Genome Information of Maribacter dokdonensis DSW-8 and Comparative Analysis with Other Maribacter Genomes

  • Kwak, Min-Jung;Lee, Jidam;Kwon, Soon-Kyeong;Kim, Jihyun F.
    • Journal of Microbiology and Biotechnology
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    • v.27 no.3
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    • pp.591-597
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    • 2017
  • Maribacter dokdonensis DSW-8 was isolated from the seawater off Dokdo in Korea. To investigate the genomic features of this marine bacterium, we sequenced its genome and analyzed the genomic features. After de novo assembly and gene prediction, 16 contigs totaling 4,434,543 bp (35.95% G+C content) in size were generated and 3,835 protein-coding sequences, 36 transfer RNAs, and 6 ribosomal RNAs were detected. In the genome of DSW-8, genes encoding the proteins associated with gliding motility, molybdenum cofactor biosynthesis, and utilization of several kinds of carbohydrates were identified. To analyze the genomic relationships among Maribacter species, we compared publically available Maribacter genomes, including that of M. dokdonensis DSW-8. A phylogenomic tree based on 1,772 genes conserved among the eight Maribacter strains showed that Maribacter speices isolated from seawater are distinguishable from species originating from algal blooms. Comparison of the gene contents using COG and subsystem databases demonstrated that the relative abundance of genes involved in carbohydrate metabolism are higher in seawater-originating strains than those of algal blooms. These results indicate that the genomic information of Maribacter species reflects the characteristics of their habitats and provides useful information for carbon utilization of marine flavobacteria.

Comparative Genomic Analysis of Lactobacillus plantarum GB-LP1 Isolated from Traditional Korean Fermented Food

  • Yu, Jihyun;Ahn, Sojin;Kim, Kwondo;Caetano-Anolles, Kelsey;Lee, Chanho;Kang, Jungsun;Cho, Kyungjin;Yoon, Sook Hee;Kang, Dae-Kyung;Kim, Heebal
    • Journal of Microbiology and Biotechnology
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    • v.27 no.8
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    • pp.1419-1427
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    • 2017
  • As probiotics play an important role in maintaining a healthy gut flora environment through antitoxin activity and inhibition of pathogen colonization, they have been of interest to the medical research community for quite some time now. Probiotic bacteria such as Lactobacillus plantarum, which can be found in fermented food, are of particular interest given their easy accessibility. We performed whole-genome sequencing and genomic analysis on a GB-LP1 strain of L. plantarum isolated from Korean traditional fermented food; this strain is well known for its functions in immune response, suppression of pathogen growth, and antitoxin effects. The complete genome sequence of GB-LP1 is a single chromosome of 3,040,388 bp with 2,899 predicted open reading frames. Genomic analysis of GB-LP1 revealed two CRISPR regions and genes showing accelerated evolution, which may have antibiotic and antitoxin functions. The aim of the present study was to predict strain specific-genomic characteristics and assess the potential of this new strain as lactic acid bacteria at the genomic level using in silico analysis. These results provide insight into the L. plantarum species as well as confirm the possibility of its utility as a candidate probiotic.

Application of next generation sequencing (NGS) system for whole-genome sequencing of porcine reproductive and respiratory syndrome virus (PRRSV) (돼지생식기호흡기증후군바이러스(PRRSV)의 전장 유전체 염기서열(whole-genome sequencing) 분석을 위한 차세대 염기서열 분석법의 활용)

  • Moon, Sung-Hyun;Khatun, Amina;Kim, Won-Il;Hossain, Md Mukter;Oh, Yeonsu;Cho, Ho-Seong
    • Korean Journal of Veterinary Service
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    • v.39 no.1
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    • pp.41-49
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    • 2016
  • In the present study, fast and robust methods for the next generation sequencing (NGS) were developed for analysis of PRRSV full genome sequences, which is a positive sensed RNA virus with a high degree of genetic variability among isolates. Two strains of PRRSVs (VR2332 and VR2332-R) which have been maintained in our laboratory were used to validate our methods and to compare with the sequence registered in GenBank (GenBank accession no. EF536003). The results suggested that both of strains had 100% coverage with the reference; the VR2332 had the coverage depth from minimum 3 to maximum 23,012, for the VR2332-R from minimum 3 to maximum 41,348, and 22,712 as an average depth. Genomic data produced from the massive sequencing capacities of the NGS have enabled the study of PRRSV at an unprecedented rate and details. Unlike conventional sequence methods which require the knowledge of conserved regions, the NGS allows de novo assembly of the full viral genomes. Therefore, our results suggested that these methods using the NGS massively facilitate the generation of more full genome PRRSV sequences locally as well as nationally in regard of saving time and cost.