Abstract
Modern combination antiretroviral therapy (cART) can bring HIV-1 in blood plasma to level undetectable by standard tests, prevent the onset of acquired immune deficiency syndrome (AIDS), and allow a near-normal life expectancy for HIV-infected individuals. Unfortunately, cART is not curative, as within a few weeks of treatment cessation, HIV viremia in most patients rebounds to pre-cART levels. The primary source of this rebound, and the principal barrier to a cure, is the highly stable reservoir of latent yet replication-competent HIV-1 proviruses integrated into the genomic DNA of resting memory CD4+ T cells. In this review, prevailing models for how the latent reservoir is established and maintained, residual viremia and viremic rebound upon withdrawal of cART, and the types and characteristics of cells harboring latent HIV-1 will be discussed. Selected technologies currently being used to advance our understanding of HIV latency will also be presented, as will a perspective on which areas of advancement are most essential for producing the next generation of HIV-1 therapeutics.
Keywords: HIV, latency, provirus, integration, residual viremia, antiretroviral, T cell, CD4, TCR, clonal expansion, homeostatic maintenance, multiple displacement amplification, MDA.
Graphical Abstract
[http://dx.doi.org/10.1056/NEJM199709113371102] [PMID: 9287228]
[http://dx.doi.org/10.1056/NEJM199709113371101] [PMID: 9287227]
[http://dx.doi.org/10.1038/387188a0] [PMID: 9144290]
[http://dx.doi.org/10.1016/S2352-3018(19)30030-X] [PMID: 30772420]
[http://dx.doi.org/10.1001/jama.2014.8722] [PMID: 25038359]
[http://dx.doi.org/10.1111/j.1610-0387.2007.06322.x] [PMID: 17760894]
[http://dx.doi.org/10.1093/eurheartj/eht528] [PMID: 24408888]
[http://dx.doi.org/10.1093/cid/cis919] [PMID: 23090925]
[http://dx.doi.org/10.1016/j.emc.2010.01.011] [PMID: 20413022]
[http://dx.doi.org/10.1073/pnas.96.26.15109] [PMID: 10611346]
[http://dx.doi.org/10.1073/pnas.1414926112] [PMID: 25713386]
[http://dx.doi.org/10.1128/JVI.78.3.1160-1168.2004] [PMID: 14722271]
[http://dx.doi.org/10.1038/nm.1972] [PMID: 19543283]
[http://dx.doi.org/10.1038/387183a0] [PMID: 9144289]
[http://dx.doi.org/10.1038/nm1295-1284] [PMID: 7489410]
[http://dx.doi.org/10.1038/ncomms6407] [PMID: 25382623]
[http://dx.doi.org/10.1073/pnas.1308313110] [PMID: 24277811]
[http://dx.doi.org/10.1128/JVI.74.17.7824-7833.2000] [PMID: 10933689]
[http://dx.doi.org/10.1073/pnas.94.24.13193] [PMID: 9371822]
[http://dx.doi.org/10.1093/infdis/jiv218] [PMID: 25877550]
[http://dx.doi.org/10.1038/8394] [PMID: 10229227]
[http://dx.doi.org/10.1126/science.278.5341.1295] [PMID: 9360927]
[http://dx.doi.org/10.1038/nm880] [PMID: 12754504]
[http://dx.doi.org/10.1126/science.278.5341.1291] [PMID: 9360926]
[http://dx.doi.org/10.1016/j.chom.2010.06.014] [PMID: 20638646]
[http://dx.doi.org/10.1186/s12977-018-0448-8] [PMID: 30352600]
[http://dx.doi.org/10.1016/j.chom.2016.04.010] [PMID: 27173927]
[http://dx.doi.org/10.1007/s00018-012-1101-7] [PMID: 22864624]
[http://dx.doi.org/10.1073/pnas.95.15.8869] [PMID: 9671771]
[http://dx.doi.org/10.1056/NEJMoa1302976] [PMID: 24152233]
[http://dx.doi.org/10.1038/s41591-018-0026-6] [PMID: 29892063]
[http://dx.doi.org/10.1128/JVI.00840-09] [PMID: 19570871]
[http://dx.doi.org/10.1128/JVI.77.8.4938-4949.2003] [PMID: 12663799]
[http://dx.doi.org/10.1038/nature13594] [PMID: 25042999]
[http://dx.doi.org/10.1371/journal.ppat.1003174] [PMID: 23459007]
[http://dx.doi.org/10.1016/j.immuni.2012.08.010] [PMID: 22999944]
[http://dx.doi.org/10.1128/JVI.02321-07] [PMID: 18417568]
[http://dx.doi.org/10.1128/JVI.77.1.208-216.2003] [PMID: 12477826]
[http://dx.doi.org/10.1089/aid.2014.0133] [PMID: 25134819]
[http://dx.doi.org/10.1126/science.3014648] [PMID: 3014648]
[http://dx.doi.org/10.1038/nri1527] [PMID: 15630430]
[http://dx.doi.org/10.1172/JCI84456] [PMID: 26950420]
[http://dx.doi.org/10.1073/pnas.98.2.658] [PMID: 11136236]
[http://dx.doi.org/10.1126/science.3016903] [PMID: 3016903]
[http://dx.doi.org/10.1182/blood-2006-10-051763] [PMID: 17371941]
[http://dx.doi.org/10.1189/jlb.0409264] [PMID: 19801499]
[http://dx.doi.org/10.1371/journal.ppat.1002286] [PMID: 22007152]
[http://dx.doi.org/10.1371/journal.ppat.1000395] [PMID: 19390619]
[PMID: 3493285]
[http://dx.doi.org/10.1126/science.286.5443.1353] [PMID: 10558989]
[http://dx.doi.org/10.1101/cshperspect.a012526] [PMID: 23284080]
[http://dx.doi.org/10.1126/science.271.5255.1582] [PMID: 8599114]
[http://dx.doi.org/10.1016/S1074-7613(01)00217-5] [PMID: 11672548]
[http://dx.doi.org/10.4049/jimmunol.1600343] [PMID: 27382129]
[http://dx.doi.org/10.1126/science.272.5270.1955] [PMID: 8658171]
[http://dx.doi.org/10.1016/S0092-8674(00)81313-6] [PMID: 8674119]
[http://dx.doi.org/10.1038/381661a0] [PMID: 8649511]
[http://dx.doi.org/10.1038/381667a0] [PMID: 8649512]
[http://dx.doi.org/10.1038/384184a0] [PMID: 8906796]
[http://dx.doi.org/10.1038/384179a0] [PMID: 8906795]
[http://dx.doi.org/10.1073/pnas.94.5.1925] [PMID: 9050881]
[http://dx.doi.org/10.1371/journal.ppat.1003161] [PMID: 23382686]
[http://dx.doi.org/10.1073/pnas.91.9.3862] [PMID: 8171003]
[http://dx.doi.org/10.1016/0092-8674(88)90099-2] [PMID: 2836068]
[http://dx.doi.org/10.1073/pnas.86.15.5974] [PMID: 2762307]
[http://dx.doi.org/10.1016/S0092-8674(00)81630-X] [PMID: 9845362]
[http://dx.doi.org/10.1128/JVI.77.15.8227-8236.2003] [PMID: 12857891]
[http://dx.doi.org/10.1038/326711a0] [PMID: 3031512]
[http://dx.doi.org/10.1038/sj.gene.6364047] [PMID: 14762397]
[http://dx.doi.org/10.2174/1570162033485159] [PMID: 15049426]
[http://dx.doi.org/10.1126/science.272.5258.54] [PMID: 8600537]
[http://dx.doi.org/10.1038/373123a0] [PMID: 7816094]
[http://dx.doi.org/10.1038/373117a0] [PMID: 7529365]
[http://dx.doi.org/10.1038/nature12274] [PMID: 23739328]
[http://dx.doi.org/10.1073/pnas.0509417103] [PMID: 16492778]
[http://dx.doi.org/10.1038/nm0297-205] [PMID: 9018240]
[PMID: 8207839]
[http://dx.doi.org/10.1126/science.283.5403.857] [PMID: 9933172]
[http://dx.doi.org/10.1038/328345a0] [PMID: 3496541]
[http://dx.doi.org/10.1371/journal.ppat.1000747] [PMID: 20126441]
[http://dx.doi.org/10.1371/journal.ppat.1000748] [PMID: 20126442]
[http://dx.doi.org/10.1016/j.cell.2008.06.036] [PMID: 18775311]
[http://dx.doi.org/10.1038/nm.2964] [PMID: 22972397]
[http://dx.doi.org/10.1371/journal.ppat.1002425] [PMID: 22174685]
[http://dx.doi.org/10.1038/nature10117] [PMID: 21613998]
[http://dx.doi.org/10.1128/JVI.76.17.8518-8513.2002] [PMID: 12163571]
[http://dx.doi.org/10.1371/journal.ppat.1004864] [PMID: 26020637]
[http://dx.doi.org/10.1016/0092-8674(90)90802-L] [PMID: 2331748]
[http://dx.doi.org/10.1038/nature12940] [PMID: 24356306]
[http://dx.doi.org/10.1126/science.1243640] [PMID: 24356113]
[http://dx.doi.org/10.1016/j.chom.2015.09.010] [PMID: 26468749]
[http://dx.doi.org/10.1089/104454902760599672] [PMID: 12443539]
[http://dx.doi.org/10.1128/JVI.75.18.8524-8537.2001] [PMID: 11507198]
[http://dx.doi.org/10.1097/00002030-200405210-00003] [PMID: 15166525]
[http://dx.doi.org/10.1615/CritRevImmunol.2014010373] [PMID: 24940912]
[http://dx.doi.org/10.1038/nature06672] [PMID: 18322463]
[http://dx.doi.org/10.1038/nri778] [PMID: 12001996]
[http://dx.doi.org/10.1016/j.immuni.2011.08.016] [PMID: 22018471]
[http://dx.doi.org/10.1038/ni.2038] [PMID: 21739668]
[http://dx.doi.org/10.1038/ni.1826] [PMID: 19935657]
[PMID: 9794378]
[http://dx.doi.org/10.1038/nri959] [PMID: 12461571]
[http://dx.doi.org/10.1016/j.ceb.2012.05.002] [PMID: 22658837]
[http://dx.doi.org/10.1016/j.immuni.2011.03.023] [PMID: 21636296]
[http://dx.doi.org/10.1182/blood-2008-07-168393] [PMID: 18849485]
[http://dx.doi.org/10.1016/j.virol.2006.07.020] [PMID: 16919704]
[http://dx.doi.org/10.1182/blood-2007-06-097907] [PMID: 17881634]
[http://dx.doi.org/10.1128/JVI.01519-09] [PMID: 20410271]
[http://dx.doi.org/10.1172/JCI39199] [PMID: 19805909]
[http://dx.doi.org/10.1016/j.coi.2013.09.003] [PMID: 24148236]
[http://dx.doi.org/10.1038/nm.2446] [PMID: 21926977]
[http://dx.doi.org/10.1038/nm.2502] [PMID: 21988989]
[http://dx.doi.org/10.1002/eji.200939722] [PMID: 19672903]
[http://dx.doi.org/10.4049/jimmunol.1500515] [PMID: 26092813]
[http://dx.doi.org/10.1016/bs.ai.2015.07.006] [PMID: 26477366]
[http://dx.doi.org/10.1038/cmi.2012.44] [PMID: 23085947]
[http://dx.doi.org/10.1172/JCI23196] [PMID: 16025158]
[http://dx.doi.org/10.1128/JVI.01900-14] [PMID: 25253353]
[http://dx.doi.org/10.1182/blood-2012-11-465625] [PMID: 23589672]
[http://dx.doi.org/10.1371/journal.ppat.1002288] [PMID: 21998586]
[http://dx.doi.org/10.1371/journal.ppat.1003211] [PMID: 23516360]
[http://dx.doi.org/10.1038/nm.3445] [PMID: 24412925]
[http://dx.doi.org/10.1182/blood-2012-09-378653] [PMID: 23325835]
[http://dx.doi.org/10.1002/(SICI)1098-2264(199705)19:1<14:AID-GCC3>3.0.CO;2-3] [PMID: 9135990]
[http://dx.doi.org/10.1074/jbc.M702051200] [PMID: 17416586]
[http://dx.doi.org/10.1093/nar/21.12.2831] [PMID: 8332492]
[http://dx.doi.org/10.1016/j.immuni.2011.09.019] [PMID: 22177921]
[http://dx.doi.org/10.4161/onci.19440] [PMID: 22754771]
[http://dx.doi.org/10.1128/JVI.01595-15] [PMID: 26339043]
[http://dx.doi.org/10.1186/s12977-015-0226-9] [PMID: 26654242]
[http://dx.doi.org/10.4049/jimmunol.0903058] [PMID: 20042588]
[http://dx.doi.org/10.4049/jimmunol.1401161] [PMID: 25362178]
[http://dx.doi.org/10.1038/nm.3781] [PMID: 25599132]
[http://dx.doi.org/10.4049/jimmunol.1103138] [PMID: 22387550]
[http://dx.doi.org/10.1084/jem.20121932] [PMID: 23254284]
[http://dx.doi.org/10.1016/j.immuni.2014.10.004] [PMID: 25367570]
[http://dx.doi.org/10.1371/journal.pone.0003305] [PMID: 18827929]
[http://dx.doi.org/10.1371/journal.ppat.1005201] [PMID: 26473478]
[http://dx.doi.org/10.1097/QAD.0000000000000599] [PMID: 25849830]
[http://dx.doi.org/10.1371/journal.ppat.1005153] [PMID: 26402858]
[http://dx.doi.org/10.1056/NEJM199905273402102] [PMID: 10341273]
[http://dx.doi.org/10.1086/525283] [PMID: 18248304]
[PMID: 15735443]
[http://dx.doi.org/10.1001/jama.282.17.1627] [PMID: 10553788]
[http://dx.doi.org/10.1371/journal.ppat.0030046] [PMID: 17411338]
[http://dx.doi.org/10.1128/JCM.41.10.4531-4536.2003] [PMID: 14532178]
[http://dx.doi.org/10.1073/pnas.0903107106] [PMID: 19470482]
[http://dx.doi.org/10.1371/journal.pmed.1000321] [PMID: 20711481]
[http://dx.doi.org/10.1086/650749] [PMID: 20156060]
[http://dx.doi.org/10.1093/cid/ciu585] [PMID: 25073894]
[http://dx.doi.org/10.1016/j.jtbi.2016.12.015] [PMID: 28025011]
[http://dx.doi.org/10.1128/JVI.00591-06] [PMID: 16775332]
[http://dx.doi.org/10.1001/jama.286.2.196] [PMID: 11448283]
[http://dx.doi.org/10.1086/382488] [PMID: 15073683]
[http://dx.doi.org/10.1001/jama.293.7.817] [PMID: 15713771]
[http://dx.doi.org/10.1128/JVI.78.2.968-979.2004] [PMID: 14694128]
[http://dx.doi.org/10.1128/JVI.00284-11] [PMID: 21367910]
[http://dx.doi.org/10.1128/JVI.79.15.9625-9634.2005] [PMID: 16014925]
[http://dx.doi.org/10.1128/JVI.01985-12] [PMID: 23175380]
[http://dx.doi.org/10.1073/pnas.1406663111] [PMID: 25097264]
[http://dx.doi.org/10.1073/pnas.0804192105] [PMID: 18936487]
[http://dx.doi.org/10.7326/M14-1027] [PMID: 25047577]
[http://dx.doi.org/10.1093/infdis/jit086] [PMID: 23460751]
[http://dx.doi.org/10.1128/JVI.01960-08] [PMID: 19116249]
[http://dx.doi.org/10.1073/pnas.0802203105] [PMID: 18490657]
[http://dx.doi.org/10.1128/JVI.77.9.5540-5546.2003] [PMID: 12692259]
[http://dx.doi.org/10.1172/JCI26197] [PMID: 16276421]
[http://dx.doi.org/10.1097/COH.0b013e32835fc68a] [PMID: 23454865]
[http://dx.doi.org/10.1073/pnas.1318249111] [PMID: 24469825]
[http://dx.doi.org/10.1093/jac/dkw046] [PMID: 27076103]
[http://dx.doi.org/10.1038/nature16933] [PMID: 26814962]
[http://dx.doi.org/10.1016/j.cell.2016.06.039] [PMID: 27453467]
[http://dx.doi.org/10.1093/ofid/ofx173] [PMID: 30310821]
[http://dx.doi.org/10.7554/eLife.18889] [PMID: 27855060]
[http://dx.doi.org/10.1371/journal.ppat.1002506] [PMID: 22319447]
[http://dx.doi.org/10.1371/journal.ppat.1004010] [PMID: 24651464]
[http://dx.doi.org/10.1038/nm917] [PMID: 12925846]
[http://dx.doi.org/10.1038/75063] [PMID: 10802716]
[http://dx.doi.org/10.1172/JCI200317533] [PMID: 12975480]
[http://dx.doi.org/10.1073/pnas.92.9.3707] [PMID: 7731969]
[http://dx.doi.org/10.1038/360264a0] [PMID: 1436108]
[http://dx.doi.org/10.1073/pnas.0709713105] [PMID: 18420820]
[http://dx.doi.org/10.1016/j.immuni.2008.11.002] [PMID: 19100699]
[http://dx.doi.org/10.1126/science.1254194] [PMID: 24968937]
[http://dx.doi.org/10.1073/pnas.1522675113] [PMID: 26858442]
[http://dx.doi.org/10.1126/science.1256304] [PMID: 25011556]
[http://dx.doi.org/10.1097/QAD.0000000000000894] [PMID: 26684819]
[http://dx.doi.org/10.1084/jem.20061805] [PMID: 17420265]
[http://dx.doi.org/10.1128/JVI.00070-06] [PMID: 16809286]
[http://dx.doi.org/10.1128/JVI.78.12.6122-6133.2004] [PMID: 15163705]
[http://dx.doi.org/10.1016/S0092-8674(02)00864-4] [PMID: 12202041]
[http://dx.doi.org/10.1093/bioinformatics/bts004] [PMID: 22238265]
[http://dx.doi.org/10.1016/j.cell.2015.01.020] [PMID: 25635456]
[http://dx.doi.org/10.1111/his.12100] [PMID: 23672313]
[http://dx.doi.org/10.1002/gcc.20845] [PMID: 21319257]
[http://dx.doi.org/10.1038/onc.2011.560] [PMID: 22139079]
[http://dx.doi.org/10.1086/510915] [PMID: 17262715]
[http://dx.doi.org/10.1038/s41467-019-12046-3] [PMID: 31492853]
[http://dx.doi.org/10.1038/nm.4156] [PMID: 27500724]
[http://dx.doi.org/10.1016/j.cell.2013.09.020] [PMID: 24243014]
[http://dx.doi.org/10.1016/j.virol.2015.03.012] [PMID: 25818029]
[http://dx.doi.org/10.1186/s12977-016-0321-6] [PMID: 27998286]
[http://dx.doi.org/10.1172/JCI124291] [PMID: 30688658]
[http://dx.doi.org/10.1073/pnas.1910334116]
[http://dx.doi.org/10.1016/j.mib.2007.08.005] [PMID: 17923430]
[http://dx.doi.org/10.3389/fimmu.2018.01638] [PMID: 30072991]