Title |
Saliva DNA quality and genotyping efficiency in a predominantly elderly population
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Published in |
BMC Medical Genomics, April 2016
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DOI | 10.1186/s12920-016-0172-y |
Pubmed ID | |
Authors |
Harini V. Gudiseva, Mark Hansen, Linda Gutierrez, David W. Collins, Jie He, Lana D. Verkuil, Ian D. Danford, Anna Sagaser, Anita S. Bowman, Rebecca Salowe, Prithvi S. Sankar, Eydie Miller-Ellis, Amanda Lehman, Joan M. O’Brien |
Abstract |
The question of whether DNA obtained from saliva is an acceptable alternative to DNA from blood is a topic of considerable interest for large genetics studies. We compared the yields, quality and performance of DNAs from saliva and blood from a mostly elderly study population. Two thousand nine hundred ten DNAs from primarily elderly subjects (mean age ± standard deviation (SD): 65 ± 12 years), collected for the Primary Open-Angle African-American Glaucoma Genetics (POAAGG) study, were evaluated by fluorometry and/or spectroscopy. These included 566 DNAs from blood and 2344 from saliva. Subsets of these were evaluated by Sanger sequencing (n = 1555), and by microarray SNP genotyping (n = 94) on an Illumina OmniExpress bead chip platform. The mean age of subjects was 65, and 68 % were female in both the blood and saliva groups. The mean ± SD of DNA yield per ml of requested specimen was significantly higher for saliva (17.6 ± 17.8 μg/ml) than blood (13.2 ± 8.5 μg/ml), but the mean ± SD of total DNA yield obtained per saliva specimen (35 ± 36 μg from 2 ml maximum specimen volume) was approximately three-fold lower than from blood (106 ± 68 μg from 8 ml maximum specimen volume). The average genotyping call rates were >99 % for 43 of 44 saliva DNAs and >99 % for 50 of 50 for blood DNAs. For 22 of 23 paired blood and saliva samples from the same individuals, the average genotyping concordance rate was 99.996 %. High quality PCR Sanger sequencing was obtained from ≥ 98 % of blood (n = 297) and saliva (n = 1258) DNAs. DNA concentrations ≥10 ng/μl, corresponding to total yields ≥ 2 μg, were obtained for 94 % of the saliva specimens (n = 2344). In spite of inferior purity, the performance of saliva DNAs for microarray genotyping was excellent. Our results agree with other studies concluding that saliva collection is a viable alternative to blood. The potential to boost study enrollments and reduce subject discomfort is not necessarily offset by a reduction in genotyping efficiency. Saliva DNAs performed comparably to blood DNAs for PCR Sanger sequencing. |
X Demographics
Geographical breakdown
Country | Count | As % |
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Spain | 1 | 33% |
United States | 1 | 33% |
United Kingdom | 1 | 33% |
Demographic breakdown
Type | Count | As % |
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Members of the public | 2 | 67% |
Science communicators (journalists, bloggers, editors) | 1 | 33% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
Unknown | 65 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Master | 9 | 14% |
Student > Bachelor | 9 | 14% |
Student > Postgraduate | 7 | 11% |
Student > Ph. D. Student | 7 | 11% |
Student > Doctoral Student | 5 | 8% |
Other | 12 | 18% |
Unknown | 16 | 25% |
Readers by discipline | Count | As % |
---|---|---|
Medicine and Dentistry | 13 | 20% |
Biochemistry, Genetics and Molecular Biology | 13 | 20% |
Agricultural and Biological Sciences | 9 | 14% |
Nursing and Health Professions | 2 | 3% |
Unspecified | 2 | 3% |
Other | 8 | 12% |
Unknown | 18 | 28% |