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Objective To study the relationship between erythromycin sensitivity and drug-resistance gene in Mycoplasma pneu-moniae(Mp).Methods In 46 erythromycin-resistant MP clinical isolates,domain Ⅴ of 23S rRNA was amplified by polymerase chain reaction(PCR),followed by direct automatic sequencing method.The DNA sequences were compared to find molecular mecha-nisms of drug resistance.Results Among the 46 erythromycin-resistant Mp clinical isolates,44(95.65%)harbored an A-to-G tran-sition mutation at position 2063 in the 23S rRNA gene and 2(4.35%)harbored an A-to-G transition mutation at position 2064,but no A-to-C transition mutation at position 2063 and C-to-G/A transition mutation at position 2617 were detected.Conclusion E-rythromycin-resistant of Mp clinical isolates were closely related to A-to-G transition mutation at position 2063/2064 in domain Ⅴof 23S rRNA genes and the most important was the A2063G transition mutation.Rapid and accurate identification of the genetic mutations in domain Ⅴ of 23S rRNA may be help to diagnose the infection of Mycoplasma pneumoniae,provide the drug-resistant information,and instruct the application of antibiotics reasonably and effectively.
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Objective To explore the association of peroxisome proliferators-activated receptor-γ coactivator-1 (PPARGC1) Gly482Ser with apolipoprotein E (ApoE) variations in longevity (aged above 90 yrs) Hans in Guangxi Yongfu and to explore the potential association between the variations and metabolic traits.Methods Based on our survey in Guangxi Yongfu in 2008-2011,212 elderly cases (aged 90～105 years) were included as longevity group and 207 cases without longevity history were included as control group.By household survey,we collected the longevity related parameters,blood glucose,blood lipid,blood pressure and other related metabolic traits.Peripheral blood was collected to extract DNA,the gene variations of Gly482Ser and ApoE were genotyped,and the database with genome and traits information were set up.By univariate analysis and multivariate genetic statistical analysis,the association between the variations and longevity and metabolic traits was assessed.Results Compared with the control group,the levels of fasting blood glucose,total cholesterol and low density lipoprotein were lower in the longevity group.Gly482Ser was genotyped in all samples and fully fulfilled the Hardy Weinberg equilibrium.After the Bonferroni correction,recessive model failed to find association between GG genotype and longevity.Stratified analyses by ApoEε4 allele revealed that,in the subgroup with no ApoEε4,PPARGC-1 GG genotype was positively associated with longevity in the recessive model,even after Bonferroni correction (OR =1.72,P＜0.05).In addition,longevity group with Gly482Ser GG genotype seemed to have relativelower fasting blood glucose (P ＜ 0.05) and higher high density lipoprotein levels (P ＜ 0.05).Conclusions Longevity Hans in Guangxi Yongfu preserve better metabolic state compared with the control group.GG genotype of Gly482Ser in PPARGC-1 is positively associated with longevity,which depends on not carrying the risk allele of ApoE ε4.