Evidence map›Paper›PMID 28001461›Full record

ArticleEpigenetics2017

Tobacco smoking and smoking-related DNA methylation are associated with the development of frailty among older adults.

Xu Gao, Yan Zhang, Kai-Uwe Saum, Ben Schöttker, Lutz Philipp Breitling, Hermann Brenner

Abstract read
In one paragraph

Article in Epigenetics, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 32 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
32citing papers in PubMed, 2 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

32 citing papers in PubMed, 2 syntheses or guidelines pooled it.

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  15. Epigenetic Age Acceleration Markers Are Associated With Physiologic Frailty and All-Cause Mortality in People With Human Immunodeficiency Virus.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2023
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

Xu Gaoa Division of Clinical Epidemiology and Aging Research , German Cancer Research Center (DKFZ) , Heidelberg , Germany.
Yan Zhanga Division of Clinical Epidemiology and Aging Research , German Cancer Research Center (DKFZ) , Heidelberg , Germany.
Kai-Uwe Sauma Division of Clinical Epidemiology and Aging Research , German Cancer Research Center (DKFZ) , Heidelberg , Germany.
Ben Schöttkera Division of Clinical Epidemiology and Aging Research , German Cancer Research Center (DKFZ) , Heidelberg , Germany.
Lutz Philipp Breitlinga Division of Clinical Epidemiology and Aging Research , German Cancer Research Center (DKFZ) , Heidelberg , Germany.
Hermann Brennera Division of Clinical Epidemiology and Aging Research , German Cancer Research Center (DKFZ) , Heidelberg , Germany.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Tobacco smoking is a preventable environmental factor that contributes to a wide spectrum of age-related health outcomes; however, its association with the development of frailty is not yet well established. We examined the associations of self-reported smoking indicators, serum cotinine levels and smoking-related DNA methylation biomarkers with a quantitative frailty index (FI) in 2 independent subsets of older adults (age 50-75) recruited in Saarland, Germany in 2000 - 2002 (discovery set: n = 978, validation set: n = 531). We obtained DNA methylation profiles in whole blood samples by Illumina HumanMethylation450 BeadChip and calculated the FI according to the method of Mitnitski and Rockwood. Mixed linear regression models were implemented to assess the associations between smoking indicators and the FI. After controlling for potential covariates, current smoking, cumulative smoking exposure (pack-years), and time after smoking cessation (years) were significantly associated with the FI (P-value < 0.05). In the discovery panel, 17 out of 151 previously identified smoking-related CpG sites were associated with the FI after correction for multiple testing (FDR < 0.05). Nine of them survived in the validation phase and were designated as frailty-associated loci. A smoking index (SI) based on the 9 loci manifested a monotonic association with the FI. In conclusion, this study suggested that epigenetic alterations could play a role in smoking-associated development of frailty. The identified CpG sites have the potential to be prognostic biomarkers of frailty and frailty-related health outcomes. Our findings and the underlying mechanisms should be followed up in further, preferably longitudinal studies.

Indexed as

DNA MethylationAgedAgingCase-Control StudiesCpG IslandsFemaleFrail ElderlyGermanyHumansMaleMiddle AgedSmokingAgingepigenetic epidemiologyfrailtysmoking methylationwhole blood sample

Identifiers

PMID28001461
PMCPMC5330443

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.