Leukocyte telomere length variation due to DNA extraction method

Article

Denham, Joshua, Marques, Francine Z and Charchar, Fadi J. 2014. "Leukocyte telomere length variation due to DNA extraction method." BMC Research Notes. 7. https://doi.org/10.1186/1756-0500-7-877
Article Title

Leukocyte telomere length variation due to DNA extraction method

ERA Journal ID42229
Article CategoryArticle
AuthorsDenham, Joshua, Marques, Francine Z and Charchar, Fadi J
Journal TitleBMC Research Notes
Journal Citation7
Article Number877
Number of Pages6
Year2014
PublisherBioMed Central Ltd.
Place of PublicationUnited Kingdom
ISSN1756-0500
Digital Object Identifier (DOI)https://doi.org/10.1186/1756-0500-7-877
Web Address (URL)https://bmcresnotes.biomedcentral.com/articles/10.1186/1756-0500-7-877
Abstract

Background
Telomere length is indicative of biological age. Shorter telomeres have been associated with several disease and health states. There are inconsistencies throughout the literature amongst relative telomere length measured by quantitative PCR (qPCR) and different extraction methods or kits used. We quantified whole-blood leukocyte telomere length using the telomere to single copy gene (T/S) ratio by qPCR in 20 young (18-25 yrs) men after extracting DNA using three common extraction methods: Lahiri and Nurnberger (high salt) method, PureLink Genomic DNA Mini kit (Life Technologies) and QiaAmp DNA Mini kit (Qiagen). Telomere length differences of DNA extracted from the three extraction methods was assessed by one-way analysis of variance (ANOVA).

Results
DNA purity differed between extraction methods used (P = 0.01). Telomere length was impacted by the DNA extraction method used (P = 0.01). Telomeres extracted using the Lahiri and Nurnberger method (mean T/S ratio: 2.43, range: 1.57 – 3.02) and PureLink Genomic DNA Mini Kit (mean T/S ratio: 2.57, range: 2.24 – 2.80) did not differ (P = 0.13). Likewise, QiaAmp and Purelink-extracted telomeres were not statistically different (P = 0.14). The Lahiri-extracted telomeres, however, were significantly shorter than those extracted using the QiaAmp DNA Mini Kit (mean T/S ratio: 2.71, range: 2.32 – 3.02; P = 0.003). DNA purity was associated with telomere length.

Conclusion
There are discrepancies between the length of leukocyte telomeres extracted from the same individuals according to the DNA extraction method used. DNA purity could be responsible for the discrepancy in telomere length but this will require validation studies. We recommend using the same DNA extraction kit when quantifying leukocyte telomere length by qPCR or when comparing different cohorts to avoid erroneous associations between telomere length and traits of interest.

KeywordsTelomeres; Leukocyte; T/S ratio; qPCR; DNA extraction; High salt method
ANZSRC Field of Research 2020310599. Genetics not elsewhere classified
310508. Genome structure and regulation
Byline AffiliationsFederation University
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