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Lijuan He,Zhaokai Wang,Sulin Lou,Xiangzhi Lin,Fan Hu 한국유전학회 2018 Genes & Genomics Vol.40 No.5
In this study, the chloroplast genome of Hariotina reticulata was fully sequenced and compared to other Sphaeropleales chloroplast genomes. It is 210,757 bp larger than most Sphaeropleales cpDNAs. It presents a traditional chloroplast structure, and contains 103 genes, including 68 protein-coding genes, six rRNA genes and 29 tRNA genes. The coding region constitutes of 43% of the whole cpDNA. Eighteen introns are found in 11 genes and six introns are unique for Hariotina. 11 open reading frames are identified among these introns. The synteny between Hariotina and Acutodesmus cpDNAs is in general identical, while within Sphaeropleales order, high variability in cpDNA architecture is indicated by general high DCJ distances. Ankyra judayi exhibits the greatest dissimilarity in gene synteny to the others and share some unique gene clusters with Treubaria triappendiculata. The phylogenomic analyses show that A. judayi is clustered with Treubariaceae species and sister to Chlorophyceae incertae sedis and other Sphaeropleales species. The monophyly of Sphaeropleales is rejected.
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Fan Hu,Longhe Yang,Zhaokai Wang,Jinpei Wang 한국유전학회 2021 Genes & Genomics Vol.43 No.7
Background 2,4-Dinitrophenol (2,4-DNP) is an important organic environmental pollutant that is highly toxic to all forms of living organisms. A gram-positive strain (designated XM24D) was isolated from 2,4-DNP-contaminated soil by an enrichment technique. Objective The study was designed to analyze the ability of XM24D to degrade 2,4-DNP and its analogs and to reveal the degradation pathways of these aromatic compounds. Methods The degradation ability of XM24D was tested by a growth experiment. 2,4-DNP and its analog degradation pathways were predicted by genome and comparative transcriptome sequencing. Results Growth profles showed that XM24D was able to utilize 2,4-DNP as the sole source of carbon, nitrogen and energy. Analogs of 2,4-DNP, including 4-nitrophenol (PNP) and 2-chloro-4-nitrophenol (2C4NP), can also be degraded by XM24D. Genome analysis showed that the XM24D genome contains two chromosomes with a combined size of 9.08 Mb and an average GC content of 67.07%. Average nucleotide identity analysis indicated that Rhodococcus imtechensis RKJ300 is the most closely related strain to XM24D. Comparative transcriptome analysis revealed that the 2,4-DNP/PNP/2C4NP degradation pathway in XM24D is highly similar in sequence and organization to the 2,4-DNP degradation pathway in Rhodococcus opacus HL PM-1, the PNP degradation pathway in Rhodococcus opacus SAO101 and the 2C4NP degradation pathway in Rhodococcus imtechensis RKJ300. These results suggested that 2,4-DNP/PNP/2C4NP was degraded via the 2,4-dinitrocyclohexanone/4-nitrocatechol/hydroxyquinol pathway in XM24D. Conclusions Genomic and transcriptomic information on XM24D provides a valuable reference for further investigating the evolutionary characteristics of nitrophenol degradation pathways in microorganisms.
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