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Med."],"abstract":"<jats:p>Age-Related Macular Degeneration (AMD) is a bilateral ocular condition resulting in irreversible vision impairment caused by the progressive loss of photoreceptors in the macula, a region at the center of the retina. The progressive loss of photoreceptor is a key feature of dry AMD but not always wet AMD, though both forms of AMD can lead to loss of vision. Regression-based biological age clocks are one of the most promising biomarkers of aging but have not yet been used in AMD. Here we conducted analyses to identify regression-based biological age clocks for the retina and explored their use in AMD using transcriptomic data consisting of a total of 453 retina samples including 105 Minnesota Grading System (MGS) level 1 samples, 175 MGS level 2, 112 MGS level 3 and 61 MGS level 4 samples, as well as 167 fibroblast samples. The clocks yielded good separation among AMD samples with increasing severity score viz., MGS1-4, regardless of whether clocks were trained in retina tissue, dermal fibroblasts, or in combined datasets. Clock application to cultured fibroblasts, embryonic stem cells, and induced Pluripotent Stem Cells (iPSCs) were consistent with age reprograming in iPSCs. Moreover, clock application to <jats:italic>in vitro<\/jats:italic> neuronal differentiation suggests broader applications. Interesting, many of the age clock genes identified include known targets mechanistically linked to AMD and aging, such as GDF11, C16ORF72, and FBN2. This study provides new observations for retina age clocks and suggests new applications for monitoring <jats:italic>in vitro<\/jats:italic> neuronal differentiation. These clocks could provide useful markers for AMD monitoring and possible intervention, as well as potential targets for <jats:italic>in vitro<\/jats:italic> screens.<\/jats:p>","DOI":"10.3389\/fmed.2022.856853","type":"journal-article","created":{"date-parts":[[2022,7,8]],"date-time":"2022-07-08T08:49:20Z","timestamp":1657270160000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":7,"title":["Novel Epigenetic Clock Biomarkers of Age-Related Macular Degeneration"],"prefix":"10.3389","volume":"9","author":[{"given":"Saurav","family":"Mallik","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fran","family":"Grodstein","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David A.","family":"Bennett","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Demetrios G.","family":"Vavvas","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bernardo","family":"Lemos","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1965","published-online":{"date-parts":[[2022,6,16]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"1450","DOI":"10.1016\/s0161-6420(95)30846-9","article-title":"Prevalence of age-related maculopathy in Australia. 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