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Biomarkers of aging

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region is associated with decreased transcriptional activity and the opposite for hypomethylation. In other words, the more "tightly" held the DNA region then the more stable and "younger" the species. Looking at DNA methylation's properties in tissues, it was found to be almost zero for embryonic tissues, it can be used to determine acceleration of age and the results can be reproduced in chimpanzee tissue.
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physiological conditions however these supercentenarians, subjected to single cell profiling of their T-cell receptors, revealed accumulations of cytotoxic CD4 T-cells through clonal expansion. The conversion of helper CD4 T-cells to a cytotoxic variety might be an adaptation to the late stage of aging aiding in the fighting infections and potentially enhancing tumor surveillance.
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One of the applications of this finding would allow for identification of the biological age of a person. DNA methylation uses the structure of dna at different stages of life to determine an age. DNA methylation is the methylation of the cysteine in the CG or Cpg region. The hypermethylation of this
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In addition to the core histones, H2A, H2B, H3, and H4, there are other versions of the histone proteins that can be significantly different in their sequence and are important for regulating chromatin dynamics. Histone H3.3 is a variant of histone H3 that is incorporated into the genome independent
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Moqri, Mahdi; Herzog, Chiara; Poganik, Jesse R.; Justice, Jamie; Belsky, Daniel W.; Higgins-Chen, Albert; Moskalev, Alexey; Fuellen, Georg; Cohen, Alan A.; Bautmans, Ivan; Widschwendter, Martin; Ding, Jingzhong; Fleming, Alexander; Mannick, Joan; Han, Jing-Dong Jackie; Zhavoronkov, Alex; Barzilai,
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is associated with transcriptional repression and hypomethylation of these sites is associated with transcriptional activation. Many studies have shown that there is a loss of DNA methylation during ageing in many species such as, rats, mice, cows, hamsters, and humans. It has also been shown that
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There are multiple variants of histone 2, the one most notably implicated in aging is macroH2A. The function of macroH2A has generally been assumed to be transcriptional silencing; most recently, it has been suggested that macroH2A is important in repressing transcription at Senescence-Associated
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Recent data suggests that an increased frequency of senescent CD8+ T cells in the peripheral blood is associated with the development of hyperglycemia from a pre-diabetic state suggestive of senescence playing a role in metabolic aging. Senescent Cd8+ T cells could be utilized as a biomarker to
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The main mechanisms identified as potential biomarkers of aging are DNA methylation, loss of histones, and histone modification. The uses for biomarkers of aging are ubiquitous and identifying a physical parameter of biological aging would allow humans to determine our true age, mortality, and
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morbidity. The change in the physical biomarker should be proportional to the change in the age of the species. Thus after establishing a biomarker of aging, humans would be able to dive into research on extending life spans and finding timelines for the arise of potential genetic diseases.
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Recently, Hashimoto and coworkers profiled thousands of circulating immune cells from supercentenarians at single-cell resolution. They identified a unique increase in cytotoxic CD4 T cells in these supercentenarians. Generally, CD4 T-cells have helper, but not cytotoxic, functions under
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and not a predisposition to disease, should cause a minimal amount of trauma to assay in the organism, and should be reproducibly measurable during a short interval compared to the lifespan of the organism. An assemblage of biomarker data for an organism could be termed its "ageotype".
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Moqri, Mahdi; Herzog, Chiara; Poganik, Jesse R.; Ying, Kejun; Justice, Jamie N.; Belsky, Daniel W.; Higgins-Chen, Albert T.; Chen, Brian H.; Cohen, Alan A.; Fuellen, Georg; Hägg, Sara; Marioni, Riccardo E.; Widschwendter, Martin; Fortney, Kristen; Fedichev, Peter O. (February 2024).
233:, the loss of any of the three Trithorax proteins that catalyze the trimethylation of H3K4 such as, WDR-5 and the methyltransferases SET-2 and ASH-2, lowers the levels of H3K4me3 and increases lifespan. Loss of the enzyme that demethylates H3K4me3, RB-2, increases H3K4me3 levels in 142:
MNase-seq (Micrococcal Nuclease sequencing) showed a loss of nucleosomes of ~50%. Proper histone dosage is important in yeast as shown from the extended lifespans seen in strains that are overexpressing histones. A consequence of histone loss in yeast is the amplification of
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on the large datasets from South Korean, Canadian, and Eastern European populations demonstrated that biomarkers of aging may be population-specific and predictive of mortality. It is also possible to predict the human chronological age using the
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Nir; Kaeberlein, Matt; Cummings, Steven; Kennedy, Brian K.; Ferrucci, Luigi; Horvath, Steve; Verdin, Eric; Maier, Andrea B.; Snyder, Michael P.; Sebastiano, Vittorio; Gladyshev, Vadim N.; Gladyshev, V. N. (2023).
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is a promising biomarker of aging and can accurately predict human chronological age. Basic blood biochemistry and cell counts can also be used to accurately predict the chronological age. Further studies of the
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More recently, biomarkers of aging has been used in multiple clinical trials to measure slowing or reversing of age-related decline or biological aging. The Biomarkers of Aging Consortium (
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Lee, Yong-ho; Kim, So Ra; Han, Dai Hoon; Yu, Hee Tae; Han, Yoon Dae; Kim, Jin Hee; Kim, Soo Hyun; Lee, Chan Joo; Min, Byoung-Hoon; Kim, Dong-Hyun; Kim, Kyung Hwan (2018-11-02).
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Hashimoto, Kosuke; Kouno, Tsukasa; Ikawa, Tomokatsu; Hayatsu, Norihito; Miyajima, Yurina; Yabukami, Haruka; Terooatea, Tommy; Sasaki, Takashi; Suzuki, Takahiro (2019-05-20).
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Ahadi, Sara; Zhou, Wenyu; Schüssler-Fiorenza Rose, Sophia Miryam; Sailani, M. Reza; Contrepois, Kévin; Avina, Monika; Ashland, Melanie; Brunet, Anne; Snyder, Michael (2020).
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Mamoshina P, Kochetov K, Putin E, Cortese F, Aliper A, Lee WS, Ahn SM, Uhn L, Skjodt N, Kovalchuk O, Scheibye-Knudsen M, Zhavoronkov A (October 2018).
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of replication. It is the major form of histone H3 seen in the chromatin of senescent human cells, and it appears that excess H3.3 can drive
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has been tied to life span regulation in many organisms, specifically H3K4me3, an activating mark, and H4K27me3, a repressing mark. In
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Heterochromatin Foci (SAHF). Chromatin that contains macroH2A is impervious to ATP-dependent remodeling proteins and to the binding of
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would be a means of validating biomarkers of aging, it would not be a practical means for long-lived species such as humans because
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seen due to the loss of histones. There is also a reduction in the levels of H3K56ac during aging and an increase in the levels of
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Putin E, Mamoshina P, Aliper A, Korzinkin M, Moskalev A, Kolosov A, Ostrovskiy A, Cantor C, Vijg J, Zhavoronkov A (May 2016).
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that activate the DNA damage response. Loss of core histones may be a general epigenetic mark of aging across many organisms.
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Van Neste D, Tobin DJ (2004). "Hair cycle and hair pigmentation: dynamic interactions and changes associated with aging".
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that could predict functional capacity at some later age better than chronological age. Stated another way, biomarkers of
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This phenomenon is not only seen in yeast, but has also been seen in aging worms, during aging of human diploid primary
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human cells. In human primary fibroblasts, reduced synthesis of new histones was seen to be a consequence of shortened
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and other common changes seen with aging are not better indicators of future functionality than chronological age.
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have continued efforts to find and validate biomarkers of aging, but success thus far has been limited. Levels of
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knockdowns showed an increase in lifespan Changes in H3K27me3 levels also have affects on aging cells in
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Peters MJ, Joehanes R, Pilling LC, Schurmann C, Conneely KN, Powell J, et al. (October 2015).
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would take far too much time. Ideally, biomarkers of aging should assay the biological process of
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Zhang R, Poustovoitov MV, Ye X, Santos HA, Chen W, Daganzo SM, et al. (January 2005).
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would give the true "biological age", which may be different from the chronological age.
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have been used to give good predictions of the expected lifespan of middle-aged mice.
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Han Y, Han D, Yan Z, Boyd-Kirkup JD, Green CD, Khaitovich P, Han JD (December 2012).
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memory of stresses and damages experienced by the organism as it develops and ages.
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increases with age, hair graying cannot be called a biomarker of ageing. Similarly,
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Thrush, Kyra L.; Higgins-Chen, Albert T.; Liu, Zuyun; Levine, Morgan E. (2022).
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Proceedings of the National Academy of Sciences of the United States of America
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The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
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The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
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Hypomethylation of DNA can lower genomic stability, induce the reactivation of
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expression correlates with a decrease in H3K27me3 and a decrease in lifespan.
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analysis allowed for the new types of "aging clocks" to be developed. The
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has been checked and does not affect the cited material, please replace
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has been checked and does not affect the cited material, please replace
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Validated biomarkers of aging would allow for testing interventions to
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Biochimica et Biophysica Acta (BBA) - Gene Regulatory Mechanisms
860:"The transcriptional landscape of age in human peripheral blood" 376:
signal the transition from pre-diabetes to overt hyperglycemia.
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Sir2, which can increase the life span when overexpressed.
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Sen P, Shah PP, Nativio R, Berger SL (August 2016).
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state as an organism ages, similar to the increased
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mark found in studies of aging cells is the loss of
383: 288:demethylase, plays a critical role in the aging of 1188:, Hoile SP, Grenfell L, Burdge GC (August 2014). 2335: 155:, weak chromatin phasing, a higher frequency of 1128: 1126: 496:Harrison, Ph.D., David E. (November 11, 2011). 495: 926:"Epigenetic Mechanisms of Longevity and Aging" 574: 1684: 1123: 1080: 1228: 802: 753: 654: 448: 1691: 1677: 269:structures that are often associated with 1633: 1623: 1538: 1480: 1382: 1364: 1323: 1313: 1303: 1246: 1205: 1150: 1106: 1052: 1011: 949: 891: 834: 785: 688: 678: 637: 627: 551: 444: 442: 440: 1194:The Proceedings of the Nutrition Society 977: 237:and decreases their life spans. In the 198: 29: 1605: 1346: 660: 207:contributes to chromatin taking a more 14: 2336: 1439:|...|checked=yes}} 745:|...|checked=yes}} 609: 437: 1672: 1606:Camillo, Lucas Paulo de Lima (2024). 1180: 1178: 1081:McCauley BS, Dang W (December 2014). 1076: 1074: 1072: 973: 971: 969: 919: 917: 915: 913: 911: 277:response. These changes may form an 370: 1507:"Validation of biomarkers of aging" 177: 125: 120: 24: 1175: 1069: 966: 908: 307: 25: 2370: 1661:Biomarkers of Aging News Advisory 1654: 359:, all of which can contribute to 257:during postnatal development and 1834:Biodemography of human longevity 384:Applications of aging biomarkers 1599: 1555: 1497: 1447: 1340: 1271: 1222: 1028: 398:https://www.agingconsortium.org 323:base is methylated and becomes 1625:10.1093/bioinformatics/btae200 851: 603: 568: 519: 489: 34:Chromosomes during methylation 13: 1: 1698: 978:Pal S, Tyler JK (July 2016). 498:"V. Life span as a biomarker" 430: 331:context. Hypermethylation of 151:depleted region (NDR) at the 1099:10.1016/j.bbagrm.2014.05.008 1054:10.1016/j.devcel.2004.10.019 589:10.1016/j.micron.2003.11.006 467:10.1016/0531-5565(88)90025-3 449:Baker GT, Sprott RL (1988). 315:is a common modification in 7: 1664:National Institute on Aging 403: 10: 2375: 1775:research into centenarians 1523:10.1038/s41591-023-02784-9 1473:10.1016/j.cell.2023.08.003 1366:10.1186/gb-2013-14-10-r115 942:10.1016/j.cell.2016.07.050 680:10.1186/gb-2013-14-10-r115 2295: 2244: 2204: 2166: 2121: 1966: 1908: 1897: 1844:Longevity escape velocity 1807: 1731:aging-associated diseases 1706: 1572:10.1101/2022.07.13.499978 1404:10.1186/s13059-015-0649-6 1207:10.1017/S0029665114000081 710:10.1186/s13059-015-0649-6 544:10.1038/s41591-019-0719-5 327:, most often when in the 2323:Longest-living organisms 629:10.1093/gerona/56.4.b180 610:Miller RA (April 2001). 455:Experimental Gerontology 355:, and cause the loss of 344:decrease with aging and 1347:Horvath, Steve (2013). 1315:10.1073/pnas.1907883116 980:"Epigenetics and aging" 227:Methylation of histones 205:acetylation of histones 2318:Transhumanist politics 2236:Immortality in fiction 2214:Biological immortality 1758:cognitive epidemiology 1587:Cite journal requires 1004:10.1126/sciadv.1600584 273:responses such as the 35: 2122:regions by continents 1741:negligible senescence 1736:degenerative diseases 1431:|...}} 864:Nature Communications 827:10.1093/gerona/gly005 778:10.18632/aging.100968 737:|...}} 451:"Biomarkers of aging" 353:transposable elements 265:accessible (or open) 199:Histone modifications 193:transcription factors 33: 1967:regions of countries 1787:LGBT life expectancy 1618:(btae200): btae200. 420:Biomarker (medicine) 115:transcriptomic clock 62:longitudinal studies 2308:Longevity insurance 2226:Digital immortality 1852:calorie restriction 1839:Indefinite lifespan 1829:Anti-aging movement 1799:Biomarkers of aging 1296:2019PNAS..11624242H 1290:(48): 24242–24251. 996:2016SciA....2E0584P 876:2015NatCo...6.8570. 110:hematological clock 39:Biomarkers of aging 1958:World macroregions 1857:Diet and longevity 1152:10.1111/acel.12007 1041:Developmental Cell 884:10.1038/ncomms9570 661:Horvath S (2013). 502:Jackson Laboratory 415:Hallmarks of aging 313:Methylation of DNA 36: 27:Type of biomarkers 2331: 2330: 2162: 2161: 1882:stem-cell therapy 1794:Maximum life span 1467:(18): 3758–3775. 1248:10.2337/db17-1218 821:(11): 1482–1490. 508:on April 26, 2012 371:Immune biomarkers 263:transcriptionally 243:prefrontal cortex 82:Biogerontologists 16:(Redirected from 2366: 2174:Longevity claims 1906: 1905: 1770:supercentenarian 1693: 1686: 1679: 1670: 1669: 1648: 1647: 1637: 1627: 1603: 1597: 1596: 1590: 1585: 1583: 1575: 1559: 1553: 1552: 1542: 1501: 1495: 1494: 1484: 1451: 1445: 1444: 1442: 1440: 1432: 1417:Retraction Watch 1396: 1386: 1368: 1344: 1338: 1337: 1327: 1317: 1307: 1275: 1269: 1268: 1250: 1226: 1220: 1219: 1209: 1182: 1173: 1172: 1154: 1130: 1121: 1120: 1110: 1078: 1067: 1066: 1056: 1032: 1026: 1025: 1015: 984:Science Advances 975: 964: 963: 953: 921: 906: 905: 895: 855: 849: 848: 838: 806: 800: 799: 789: 757: 751: 750: 748: 746: 738: 723:Retraction Watch 702: 692: 682: 658: 652: 651: 641: 631: 607: 601: 600: 572: 566: 565: 555: 523: 517: 516: 514: 513: 504:. Archived from 493: 487: 486: 446: 410:Epigenetic clock 363:progression and 325:5-methylcytosine 178:Histone variants 126:Loss of histones 121:Epigenetic marks 105:epigenetic clock 58:maximum lifespan 21: 2374: 2373: 2369: 2368: 2367: 2365: 2364: 2363: 2334: 2333: 2332: 2327: 2291: 2245:Longevity genes 2240: 2200: 2158: 2117: 1962: 1901:life expectancy 1899: 1893: 1803: 1782:Life expectancy 1721:Longevity myths 1702: 1697: 1657: 1652: 1651: 1604: 1600: 1588: 1586: 1577: 1576: 1560: 1556: 1511:Nature Medicine 1502: 1498: 1452: 1448: 1434: 1426: 1420: 1398:(Erratum:  1397: 1345: 1341: 1276: 1272: 1227: 1223: 1183: 1176: 1131: 1124: 1093:(12): 1454–62. 1079: 1070: 1033: 1029: 990:(7): e1600584. 976: 967: 922: 909: 856: 852: 807: 803: 758: 754: 740: 732: 726: 704:(Erratum:  703: 659: 655: 608: 604: 573: 569: 532:Nature Medicine 524: 520: 511: 509: 494: 490: 461:(4–5): 223–39. 447: 438: 433: 406: 386: 373: 310: 308:DNA methylation 201: 180: 128: 123: 74:graying of hair 54:extend lifespan 28: 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1840: 1837: 1835: 1832: 1830: 1827: 1823: 1820: 1819: 1818: 1817:Topic outline 1815: 1814: 1812: 1810: 1806: 1800: 1797: 1795: 1792: 1788: 1785: 1784: 1783: 1780: 1776: 1773: 1771: 1768: 1767: 1766: 1763: 1759: 1756: 1754: 1751: 1750: 1749: 1746: 1742: 1739: 1737: 1734: 1732: 1729: 1728: 1727: 1724: 1722: 1719: 1717: 1714: 1713: 1711: 1709: 1705: 1701: 1694: 1689: 1687: 1682: 1680: 1675: 1674: 1671: 1665: 1662: 1659: 1658: 1645: 1641: 1636: 1631: 1626: 1621: 1617: 1613: 1609: 1602: 1594: 1581: 1573: 1569: 1565: 1558: 1550: 1546: 1541: 1536: 1532: 1528: 1524: 1520: 1516: 1512: 1508: 1500: 1492: 1488: 1483: 1478: 1474: 1470: 1466: 1462: 1458: 1450: 1438: 1430: 1424: 1419: 1418: 1413: 1409: 1405: 1401: 1394: 1390: 1385: 1380: 1376: 1372: 1367: 1362: 1358: 1354: 1350: 1343: 1335: 1331: 1326: 1321: 1316: 1311: 1306: 1301: 1297: 1293: 1289: 1285: 1281: 1274: 1266: 1262: 1258: 1254: 1249: 1244: 1240: 1236: 1232: 1225: 1217: 1213: 1208: 1203: 1200:(3): 413–21. 1199: 1195: 1191: 1187: 1181: 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291: 287: 282: 280: 276: 272: 268: 264: 260: 256: 252: 249:increases at 248: 244: 240: 236: 232: 228: 224: 222: 218: 214: 213:transcription 210: 206: 196: 194: 188: 186: 175: 173: 169: 165: 160: 158: 157:TATA elements 154: 150: 146: 145:transcription 141: 137: 133: 118: 116: 111: 106: 102: 97: 95: 94:naive T cells 91: 87: 83: 79: 78:skin wrinkles 75: 70: 67: 63: 59: 55: 50: 48: 44: 40: 32: 19: 2219:Regeneration 2071:South Africa 1877:rejuvenation 1867:nanomedicine 1862:gene therapy 1798: 1615: 1611: 1601: 1580:cite journal 1557: 1514: 1510: 1499: 1464: 1460: 1449: 1435:{{ 1427:{{ 1416: 1414:,   1359:(10): R115. 1356: 1352: 1342: 1287: 1283: 1273: 1238: 1234: 1224: 1197: 1193: 1186:Lillycrop KA 1142: 1138: 1090: 1086: 1047:(1): 19–30. 1044: 1040: 1030: 987: 983: 933: 929: 867: 863: 853: 818: 814: 804: 769: 765: 755: 741:{{ 733:{{ 722: 720:,   673:(10): R115. 670: 666: 656: 619: 615: 605: 580: 576: 570: 538:(1): 83–90. 535: 531: 521: 510:. 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Index

Biological age

biomarkers
aging
extend lifespan
maximum lifespan
longitudinal studies
aging
graying of hair
skin wrinkles
Biogerontologists
CD4
memory T cells
naive T cells
big data
epigenetic clock
hematological clock
transcriptomic clock
epigenetic
histones
yeast
transcription
nucleosome
promoter
TATA elements
fibroblasts
senescent
telomeres
senescence
transcription factors

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