Strains into Shanghai MSM. Bayesian skyline plot (BSP) deduced that CRF01_AE strains among Shanghai MSM started its initial growth phase around 1998, followed by an exponential expansion Stattic biological activity during 2000?007, and reached a steady growth afterwards (Supplementary material 1). Phylogenetic analysis clearly identified two distinct major lineages, Shanghai SIS3 price lineage 1 (SH-L1) and Shanghai lineage 2 (SH-L2) (constituent ratio: 87.2 and 12.4 , Fig. 1). The estimated time of the most recent common ancestors (tMRCAs) for SH-L1 and SH-L2 were 1996.0 (1992.9?999.2) and 1997.8 (1994.3?001.4), respectively (Supplementary material 2). The estimated mean evolutionary rate was 2.7 ?10-3 nucleotide substitutions/site/ year. The demographic characteristics did not differ substantially between two lineages (Supplementary material 3). SH-L1 consisted of four independent sub-lineages (SH-L1A-D), while SH-L2 just presented a small monophyletic lineage (Fig. 1). A dozen other minor lineages were dispersed in the phylogenetic tree. Previously seven distinct CRF01_AE phylogenetic lineages were found nationwide by China CDC14. Remarkably, three of the SH-L1 sub-lineages (except 1D) clustered together with China-lineage 4, while SH L2 clustered together with China-lineage 5. However, we did not find any of the other Chinese lineages in our cohort14 (Supplementary material 4). Of interest was that the sub-lineage 1D, accounting for 8.6 (n = 99), did not match with any reported lineages in China, indicating a unique Shanghai-based epidemic. The estimated tMRCA for this new identified sub-lineage was 2003.5 (2001.0?005.9), later than all other sub-lineages (Supplementary material 2). Compared to other lineages/sub-lineages, the individuals included in 1D were more likely to be single (82.8 versus 68.5 , P = 0.028), while other demographic characteristics did not differ. Identification and characterization of genetic transmission networks. Of 2, 229 individuals, 1, 211 (54.3 ) were segregated into 276 networks (Supplementary material 5), with sizes ranging between 2 and 25, (Fig. 2), in which 241 networks were related to 681 Shanghai MSM individuals (Fig. 3). Of all networks, 123 (44.6 ) were made up of only 2 individuals. The number of networks was inversely correlated to network size (Spearman’s correlation coefficient = -1.0, P < 0.001), Fig. 2. Of the 681 Shanghai MSM in networks, 74.2 (505) were linked to cases diagnosed in different years. As shown in Fig. 3, individuals newly diagnosed in different years were clearly interlinked. Of the 241 networks related to Shanghai MSM, 53 (including 88 Shanghai MSM individuals) were composed of cases diagnosed in same years, while 188 (including 593 Shanghai MSM individuals) were composed of cases diagnosed in differentScientific RepoRts | 6:34729 | DOI: 10.1038/srepResultswww.nature.com/scientificreports/Figure 2. Distribution of HIV-1 CRF01_AE genetic transmission networks among MSM in Shanghai.Figure 3. Sampling year-associated and group-associated genetic transmission networks. Different colors represent different years. Different shapes represent different groups: triangle: heterosexual women; square: heterosexual men; pentagon: MSM; hexagon: unknown. years. The proportions of linkage between individuals diagnosed in different years were 78.8 (2008), 60.2 (2009), 86.6 (2010), 72.4 (2011), 66.9 (2012) and 57.8 (2013), respectively, indicating a high transmission over the years. Of the 681 Shanghai MSM in networks,.Strains into Shanghai MSM. Bayesian skyline plot (BSP) deduced that CRF01_AE strains among Shanghai MSM started its initial growth phase around 1998, followed by an exponential expansion during 2000?007, and reached a steady growth afterwards (Supplementary material 1). Phylogenetic analysis clearly identified two distinct major lineages, Shanghai lineage 1 (SH-L1) and Shanghai lineage 2 (SH-L2) (constituent ratio: 87.2 and 12.4 , Fig. 1). The estimated time of the most recent common ancestors (tMRCAs) for SH-L1 and SH-L2 were 1996.0 (1992.9?999.2) and 1997.8 (1994.3?001.4), respectively (Supplementary material 2). The estimated mean evolutionary rate was 2.7 ?10-3 nucleotide substitutions/site/ year. The demographic characteristics did not differ substantially between two lineages (Supplementary material 3). SH-L1 consisted of four independent sub-lineages (SH-L1A-D), while SH-L2 just presented a small monophyletic lineage (Fig. 1). A dozen other minor lineages were dispersed in the phylogenetic tree. Previously seven distinct CRF01_AE phylogenetic lineages were found nationwide by China CDC14. Remarkably, three of the SH-L1 sub-lineages (except 1D) clustered together with China-lineage 4, while SH L2 clustered together with China-lineage 5. However, we did not find any of the other Chinese lineages in our cohort14 (Supplementary material 4). Of interest was that the sub-lineage 1D, accounting for 8.6 (n = 99), did not match with any reported lineages in China, indicating a unique Shanghai-based epidemic. The estimated tMRCA for this new identified sub-lineage was 2003.5 (2001.0?005.9), later than all other sub-lineages (Supplementary material 2). Compared to other lineages/sub-lineages, the individuals included in 1D were more likely to be single (82.8 versus 68.5 , P = 0.028), while other demographic characteristics did not differ. Identification and characterization of genetic transmission networks. Of 2, 229 individuals, 1, 211 (54.3 ) were segregated into 276 networks (Supplementary material 5), with sizes ranging between 2 and 25, (Fig. 2), in which 241 networks were related to 681 Shanghai MSM individuals (Fig. 3). Of all networks, 123 (44.6 ) were made up of only 2 individuals. The number of networks was inversely correlated to network size (Spearman's correlation coefficient = -1.0, P < 0.001), Fig. 2. Of the 681 Shanghai MSM in networks, 74.2 (505) were linked to cases diagnosed in different years. As shown in Fig. 3, individuals newly diagnosed in different years were clearly interlinked. Of the 241 networks related to Shanghai MSM, 53 (including 88 Shanghai MSM individuals) were composed of cases diagnosed in same years, while 188 (including 593 Shanghai MSM individuals) were composed of cases diagnosed in differentScientific RepoRts | 6:34729 | DOI: 10.1038/srepResultswww.nature.com/scientificreports/Figure 2. Distribution of HIV-1 CRF01_AE genetic transmission networks among MSM in Shanghai.Figure 3. Sampling year-associated and group-associated genetic transmission networks. Different colors represent different years. Different shapes represent different groups: triangle: heterosexual women; square: heterosexual men; pentagon: MSM; hexagon: unknown. years. The proportions of linkage between individuals diagnosed in different years were 78.8 (2008), 60.2 (2009), 86.6 (2010), 72.4 (2011), 66.9 (2012) and 57.8 (2013), respectively, indicating a high transmission over the years. Of the 681 Shanghai MSM in networks,.
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