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Alu and LINE-1 methylation and lung function in the normative ageing study
Nancy E Lange1, Joanne Sordillo, Letizia Tarantini
1Channing Division of Network Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.
BMJ Open
|October 19, 2012
Summary
Reduced methylation of Alu and LINE-1 elements is linked to poorer lung function and faster decline in older men. Further research is needed to explore environmental factors influencing this epigenetic change.
Area of Science:
- Epigenetics and Molecular Biology
- Pulmonology and Respiratory Medicine
Background:
- Epigenetic modifications, such as DNA methylation, play a crucial role in gene regulation.
- Transposable elements (TEs), including Alu and LINE-1, comprise a significant portion of the human genome and their methylation status is increasingly recognized as a potential biomarker.
- Alterations in TE methylation have been implicated in various age-related diseases, but their specific association with lung function remains underexplored.
Purpose of the Study:
- To examine the relationship between the methylation levels of Alu and LINE-1 transposable elements and lung function parameters.
- To investigate whether TE hypomethylation is associated with prevalent lung function and/or its longitudinal decline.
Main Methods:
- A cohort study design was employed using data from the Veterans Administration Normative Aging Study.
- Participants' lung function was assessed via spirometry according to established guidelines.
- DNA methylation of Alu and LINE-1 elements was quantified using PCR-pyrosequencing after bisulphite treatment.
Main Results:
- Alu hypomethylation was significantly associated with lower forced expiratory volume in 1 second (FEV(1)) and showed a trend towards association with reduced forced vital capacity (FVC).
- LINE-1 hypomethylation was significantly associated with a more rapid decline in both FEV(1) and FVC over time.
- These associations remained significant after adjusting for multiple confounding factors including age, BMI, and smoking history.
Conclusions:
- Hypomethylation of Alu and LINE-1 elements is associated with poorer lung function and accelerated lung function decline in older men.
- These findings suggest a potential role for epigenetic dysregulation of TEs in respiratory health.
- Further investigation is warranted to explore potential modifiable environmental exposures that may influence TE methylation and subsequent lung function.
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