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ABSTRACT: Harpia harpyja (Harpy eagle) genome, bHarHar1

PROVIDER: PRJNA903882 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
		Other
	SRR25728237_subreads.fastq.gz	Fastqsanger.gz
	SRR25728238_subreads.fastq.gz	Fastqsanger.gz
	SRR25728239.fastq.gz	Fastqsanger.gz
	SRR25728240_subreads.fastq.gz	Fastqsanger.gz

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Mutation of the RNA polymerase β-subunit gene promotes hetero-to-homo conversion of ß-lactam resistance of methicillin-resistant Staphylococcus aureus

Project description:Three types of phenotypic expression of ß-lactam resistance has been reported in MRSA: heterogeneous-, homogeneous-, and Eagle-type resistance. Heterogeneous to homogeneous (hetero-to-homo) conversion of ß-lactam resistance is postulated to be caused by a chromosomal mutation (chr*) together with mecA-gene expression. The Eagle-type resistance is a special pattern of chr* expression in the pre-MRSA strain N315 under the strong mecI-gene mediated repression of mecA gene transcription. Here, for the identification of chr*, experiments were conducted using an in-vitro derived homogeneously imipenem-resistant MRSA strain N315∆IPH5 (∆IPH5). The strain was selected with imipenem 8 mg/L from the heterogeneously imipenem-resistant MRSA strain N315∆IP (∆IP). The whole genome sequencing of ∆IPH5 revealed the presence of a unique mutation in the rpoB gene, rpoB(N967I), causing the amino-acid (AA) substitution of Asp by Ile at the 967th AA position of the RNA polymerase ß subunit. The effect of the mutation on the phenotypic change was confirmed by constructing and studying the phenotype of the strains H5rpoB(I967N), a ∆IPH5-derived strain cured of the rpoB mutation, and N315rpoB(N967I), a N315-derived strain introduced with the mutated rpoB gene. H5rpoB(I967N) regained the hetero-MRSA phenotype, and the mutant strain N315rpoB(N967I) showed an Eagle-type phenotype similar to that of N315h4. Furthermore, subsequent whole genome sequencing revealed that N315h4 also had a missense mutation in the rpoB gene rpoB(R644H). The rpoB mutations caused decreased autolysis, prolonged doubling-time, and tolerance to bactericidal concentrations of methicillin. We concluded that the certain rpoB mutations are chr* responsible for the hetero-to-homo phenotypic conversion of MRSA.

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