title: [Subtype and sequence analysis of gag genes among HIV-1 strains circulating in Beijing during 2007].
abstract: To investigate the subtype distribution and sequence characteristics of HIV-1 strains prevalent in Beijing during 2007 and to analyze the relationship between distribution of HIV-1 subtypes and transmission routes, we collected the anti-conglutinated whole blood samples from HIV-1 newly infected individuals in Beijing during 2007 and separated plasma specimens from the aamples. RNAs were extracted and the gag genes from the various samples were amplified by RT-PCR and nest-PCR. The PCR products were sequenced directly and phylogenetic analyses of gag genes were performed using the MEGA2 software. Among 200 HIV-1 plasma samples,161 gag HIV-1 gene fragments were amplified and analyzed. Seven HIV-1 subtypes or circulating recombinant forms (CRFs) of HIV-1 including A1 (1 strains), B (35 strains), Thai B (19 strains), C (3 strains), CRF01_AE (49 strains), CRF07_BC (51 strains), CRF08_BC (3 strain) were identified circulating in Beijing. The gene divergences inside the subtypes were different, with 7.7%, 6.5%, 6.7%, 6.7%, 5.5%, 4.3%, 5.8%, in subtype A1, B, Thai B, C, CRF01_AE, CRF07_BC, CRF08_BC, respectively. Subtypes CRF07_BC and CRF01_AE were predominant in Beijing account for 31.7% and 30.4% among samples. Seven HIV-1 subtypes exist in Beijing and the surveillance of HIV-1 gene variation should be paid more attention.
authors.affiliation: Beijing Center for Disease Prevention and Control, Beijing 100013, China. basketball197602@hotmail.com
authors.forename: Jing-Rong
authors.initials: JR
authors.lastname: Ye
authors.forename: Yang
authors.initials: Y
authors.lastname: Li
authors.forename: Li-Shi
authors.initials: LS
authors.lastname: Bai
mesh_terms: D000293:Adolescent; D000328:Adult; D002681:China / Q000453:epidemiology; D005838:Genotype; D015658:HIV Infections / Q000453:epidemiology / Q000821:virology*; D015497:HIV-1 / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification*; D006801:Humans; D008297:Male; D008875:Middle Aged; D017720:Molecular Epidemiology; D008969:Molecular Sequence Data; D010802:Phylogeny; D017422:Sequence Analysis, DNA; D055815:Young Adult; D054301:gag Gene Products, Human Immunodeficiency Virus / Q000235:genetics*
chemical_list: D054301:gag Gene Products, Human Immunodeficiency Virus; C083868:gag protein p1, Human immunodeficiency virus