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Differences in smoking associated DNA methylation patterns in South Asians and Europeans

BACKGROUND: DNA methylation is strongly associated with smoking status at multiple sites across the genome. Studies have largely been restricted to European origin individuals yet the greatest increase in smoking is occurring in low income countries, such as the Indian subcontinent. We determined wh...

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Autores principales: Elliott, Hannah R, Tillin, Therese, McArdle, Wendy L, Ho, Karen, Duggirala, Aparna, Frayling, Tim M, Davey Smith, George, Hughes, Alun D, Chaturvedi, Nish, Relton, Caroline L
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3915234/
https://www.ncbi.nlm.nih.gov/pubmed/24485148
http://dx.doi.org/10.1186/1868-7083-6-4
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author Elliott, Hannah R
Tillin, Therese
McArdle, Wendy L
Ho, Karen
Duggirala, Aparna
Frayling, Tim M
Davey Smith, George
Hughes, Alun D
Chaturvedi, Nish
Relton, Caroline L
author_facet Elliott, Hannah R
Tillin, Therese
McArdle, Wendy L
Ho, Karen
Duggirala, Aparna
Frayling, Tim M
Davey Smith, George
Hughes, Alun D
Chaturvedi, Nish
Relton, Caroline L
author_sort Elliott, Hannah R
collection PubMed
description BACKGROUND: DNA methylation is strongly associated with smoking status at multiple sites across the genome. Studies have largely been restricted to European origin individuals yet the greatest increase in smoking is occurring in low income countries, such as the Indian subcontinent. We determined whether there are differences between South Asians and Europeans in smoking related loci, and if a smoking score, combining all smoking related DNA methylation scores, could differentiate smokers from non-smokers. RESULTS: Illumina HM450k BeadChip arrays were performed on 192 samples from the Southall And Brent REvisited (SABRE) cohort. Differential methylation in smokers was identified in 29 individual CpG sites at 18 unique loci. Interaction between smoking status and ethnic group was identified at the AHRR locus. Ethnic differences in DNA methylation were identified in non-smokers at two further loci, 6p21.33 and GNG12. With the exception of GFI1 and MYO1G these differences were largely unaffected by adjustment for cell composition. A smoking score based on methylation profile was constructed. Current smokers were identified with 100% sensitivity and 97% specificity in Europeans and with 80% sensitivity and 95% specificity in South Asians. CONCLUSIONS: Differences in ethnic groups were identified in both single CpG sites and combined smoking score. The smoking score is a valuable tool for identification of true current smoking behaviour. Explanations for ethnic differences in DNA methylation in association with smoking may provide valuable clues to disease pathways.
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spelling pubmed-39152342014-02-07 Differences in smoking associated DNA methylation patterns in South Asians and Europeans Elliott, Hannah R Tillin, Therese McArdle, Wendy L Ho, Karen Duggirala, Aparna Frayling, Tim M Davey Smith, George Hughes, Alun D Chaturvedi, Nish Relton, Caroline L Clin Epigenetics Research BACKGROUND: DNA methylation is strongly associated with smoking status at multiple sites across the genome. Studies have largely been restricted to European origin individuals yet the greatest increase in smoking is occurring in low income countries, such as the Indian subcontinent. We determined whether there are differences between South Asians and Europeans in smoking related loci, and if a smoking score, combining all smoking related DNA methylation scores, could differentiate smokers from non-smokers. RESULTS: Illumina HM450k BeadChip arrays were performed on 192 samples from the Southall And Brent REvisited (SABRE) cohort. Differential methylation in smokers was identified in 29 individual CpG sites at 18 unique loci. Interaction between smoking status and ethnic group was identified at the AHRR locus. Ethnic differences in DNA methylation were identified in non-smokers at two further loci, 6p21.33 and GNG12. With the exception of GFI1 and MYO1G these differences were largely unaffected by adjustment for cell composition. A smoking score based on methylation profile was constructed. Current smokers were identified with 100% sensitivity and 97% specificity in Europeans and with 80% sensitivity and 95% specificity in South Asians. CONCLUSIONS: Differences in ethnic groups were identified in both single CpG sites and combined smoking score. The smoking score is a valuable tool for identification of true current smoking behaviour. Explanations for ethnic differences in DNA methylation in association with smoking may provide valuable clues to disease pathways. BioMed Central 2014-02-03 /pmc/articles/PMC3915234/ /pubmed/24485148 http://dx.doi.org/10.1186/1868-7083-6-4 Text en Copyright © 2014 Elliott et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Research
Elliott, Hannah R
Tillin, Therese
McArdle, Wendy L
Ho, Karen
Duggirala, Aparna
Frayling, Tim M
Davey Smith, George
Hughes, Alun D
Chaturvedi, Nish
Relton, Caroline L
Differences in smoking associated DNA methylation patterns in South Asians and Europeans
title Differences in smoking associated DNA methylation patterns in South Asians and Europeans
title_full Differences in smoking associated DNA methylation patterns in South Asians and Europeans
title_fullStr Differences in smoking associated DNA methylation patterns in South Asians and Europeans
title_full_unstemmed Differences in smoking associated DNA methylation patterns in South Asians and Europeans
title_short Differences in smoking associated DNA methylation patterns in South Asians and Europeans
title_sort differences in smoking associated dna methylation patterns in south asians and europeans
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3915234/
https://www.ncbi.nlm.nih.gov/pubmed/24485148
http://dx.doi.org/10.1186/1868-7083-6-4
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