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Analysis of Genetic Linkage of HIV from Couples Enrolled in the HPTN 052 Trial Susan H. Eshleman, MD/PhD HPTN Network Laboratory Johns Hopkins Univ. School.

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Presentation on theme: "Analysis of Genetic Linkage of HIV from Couples Enrolled in the HPTN 052 Trial Susan H. Eshleman, MD/PhD HPTN Network Laboratory Johns Hopkins Univ. School."— Presentation transcript:

1 Analysis of Genetic Linkage of HIV from Couples Enrolled in the HPTN 052 Trial Susan H. Eshleman, MD/PhD HPTN Network Laboratory Johns Hopkins Univ. School of Medicine 6 th IAS Conference - Rome, Italy July 18, 2011

2 Abstract Authors J Hughes, S Hudelson, A Redd, L Wang, R Debes, Y Chen, S Porcella, E Piwowar-Manning, M McCauley, M Hosseinipour, J Kumwenda, J Hakim, S Chariyalertsak, G de Bruyn, B Grinsztejn, N Kumarasamy, J Makhema, K Mayer, J Pilotto, B Santos, T Quinn, M Cohen, and S Eshleman for the HPTN 052 Study Team

3 Linkage Analysis 39 transmission events were included in the April 28 th DSMB report. Linkage analysis was performed to identify the subset of transmission events where the index participant was the likely source of the partner’s HIV infection.

4 Data Included in this Presentation The DSMB report included 28 linked transmission events. Those data were used to analyze the impact of immediate ART on HIV prevention. One additional linked transmission event was identified after the DSMB meeting. This additional event was in the delayed ART arm, further strengthening the association between immediate ART and HIV prevention.

5 Phylogenetic analysis of pol sequences obtained by population sequencing Statistical (Bayesian) analysis of genetic distances from pol sequence pairs Phylogenetic analysis of env sequences obtained by next generation sequencing Methods Used for Linkage Analysis

6 Genetic Diversity of HIV HIV RNA

7 HIV Diversity in an Infected Person Genetically related viruses

8 Establishing Linkage Index Partner

9 Index Partner Other individuals in the community Establishing Linkage

10 Other individuals in the community Establishing Linkage

11 Index Partner Establishing Linkage

12

13 Index Partner UNLINKED Other individuals in the community

14 Establishing Linkage

15 Population Sequencing Consensus sequence e.g., AACTGATCGGAA... Consensus sequence e.g., ATGGCTACCGAA…

16  Phylogenetic analysis of pol sequences obtained by population sequencing Statistical (Bayesian) analysis of genetic distances from pol sequence pairs Phylogenetic analysis of env sequences obtained by next generation sequencing Methods Used for Linkage Analysis

17 Phylogenetic Analysis Adapted from Margulies et al., Genome Res 2007;17:760-77 ©2007

18 Phylogenetic Analysis (pol)

19 Index Partner

20 Phylogenetic Analysis (pol)

21

22 Local Controls

23 Index Partner Phylogenetic Analysis (pol)

24 Phylogenetic analysis of pol sequences obtained by population sequencing  Statistical (Bayesian) analysis of genetic distances from pol sequence pairs Phylogenetic analysis of env sequences obtained by next generation sequencing Methods Used for Linkage Analysis

25 Statistical (Bayesian) Analysis Comparison of genetic similarity values from paired sequences (pol) Pair type BasisSample source# pairsSimilarity values “Known” linked Two samples from the same person Index-index Partner-partner 1111 99.8 98.2 “Known” unlinked Unrelated individuals 10 other index participants / site >5091.2-95.3 UnknownTransmission event Index-partner (2 each) 498.4-98.9 Representative data from one transmission event 

26 Statistical (Bayesian) Analysis Comparison of sequence similarity values from paired sequences (pol) Pair type BasisSample source# pairsSimilarity values “Known” linked Two samples from the same person Index-index Partner-partner 1111 99.8 98.2 “Known” unlinked Unrelated individuals 10 other index participants / site >5091.2-95.3 UnknownTransmission event Index-partner (2 each) 498.4-98.9 Representative data from one transmission event 

27 Statistical (Bayesian) Analysis Comparison of sequence similarity values from paired sequences (pol) Pair type BasisSample source# pairsSimilarity values “Known” linked Two samples from the same person Index-index Partner-partner 1111 99.8 98.2 “Known” unlinked Unrelated individuals 10 other index participants / site >5091.2-95.3 UnknownTransmission event Index-partner (2 each) 498.4-98.9 Representative data from one transmission event 

28 Phylogenetic analysis of pol sequences obtained by population sequencing Statistical (Bayesian) analysis of genetic distances from pol sequence pairs Phylogenetic analysis of env sequences obtained by next generation sequencing Methods Used for Linkage Analysis

29 Initial Linkage Assessment 26 events analyzed were clearly linked using both methods – those 26 events were classified as linked The linkage status of 12 events could not be definitively determined

30 Phylogenetic analysis of pol sequences obtained by population sequencing Statistical (Bayesian) analysis of genetic distances from pol sequence pairs  Phylogenetic analysis of env sequences obtained by next generation sequencing Methods Used for Linkage Analysis

31 Population Sequencing

32

33 Next Generation Sequencing

34 Index sample 1 Index sample 2 Partner sample 1 Partner sample 2 Example of an Unlinked Event (env)

35 95 86 96 90 99 91 Index sample 1 Index sample 2 Partner sample 1 Partner sample 2 0.02 Example of an Linked Event (env)

36 Next Generation Sequencing One additional event was confirmed to be linked by next generation sequencing after the April 28 th DSMB meeting. This event was in the delayed study arm, further strengthening the association between immediate ART and HIV prevention. This partner seroconverted ~1 month after the index started ART. The partner was most likely infected shortly before the index started ART, or shortly after the index started ART before the index was virally suppressed.

37 Summary of Linkage Analysis 29 linked events In 2 cases, linkage was only apparent using next generation sequencing 1 immediate ART arm; 28 delayed ART arm 7 unlinked events 4 immediate ART arm; 3 delayed ART arm

38 Summary of Linkage Analysis 29 linked events In 2 cases, linkage was only apparent using next generation sequencing 1 immediate ART arm; 28 delayed ART arm 7 unlinked events 4 immediate ART arm; 3 delayed ART arm 3 additional events 2 events were not classified based on available data 1 late event is still being analyzed All 3 were in the delayed arm, not on ART

39 Factors Associated with Linkage Linkage was not associated with: Geographic region Index gender Index CD4 cell count at enrollment Years between enrollment and seroconversion

40 Factors Associated with Linkage LinkedUnlinkedP value Index study arm0.018 Immediate ART1 (3%)3 (43%) Delayed ART28 (97%)4 (57%) Index on ART at time of SC0.0076 Yes2 (7%)4 (57%) No27 (93%)3 (43%) # sex partners ≤3 months before SC<0.0001 a >10 (0%)4 (57%) =126 (90%)3 (43%) =02 (7%)0 (0%) Total297

41 LinkedUnlinkedP value Index study arm0.018 Immediate ART1 (3%)3 (43%) Delayed ART28 (97%)4 (57%) Index on ART at time of SC0.0076 Yes2 (7%)4 (57%) No27 (93%)3 (43%) # sex partners ≤3 months before SC<0.0001 a >10 (0%)4 (57%) =126 (90%)3 (43%) =02 (7%)0 (0%) Total297 Factors Associated with Linkage

42 LinkedUnlinkedP value Index study arm0.018 Immediate ART1 (3%)3 (43%) Delayed ART28 (97%)4 (57%) Index on ART at time of SC0.0076 Yes2* (7%)4 (57%) No27 (93%)3 (43%) # sex partners ≤3 months before SC<0.0001 a >10 (0%)4 (57%) =126 (90%)3 (43%) =02 (7%)0 (0%) Total297 1 linked transmission in the immediate ART arm identified pre-DSMB 1 linked transmission in the delayed ART arm identified post-DSMB Factors Associated with Linkage

43 LinkedUnlinkedP value Index study arm0.018 Immediate ART1 (3%)3 (43%) Delayed ART28 (97%)4 (57%) Index on ART at time of SC0.0076 Yes2 (7%)4 (57%) No27 (93%)3 (43%) # sex partners ≤3 months before SC*<0.0001 a >10 (0%)4 (57%) =126 (90%)3 (43%) =02 (7%)0 (0%) Total297 *Data was missing for one participant Factors Associated with Linkage

44 Conclusions We used a combination of laboratory and statistical methods to determine the linkage status of transmission events in HPTN 052 These data were used to identify the endpoints used in the analysis of HIV prevention in the HPTN 052 trial A manuscript describing the analysis of HIV linkage in HPTN 052 is In Press in the Journal of Infectious Diseases

45 Craig Martens Stacy Ricklefs San-San Ou Stuart Ray Supriya Munshaw Susan Fiscus Ron Swanstrom Thanks

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