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Simultaneously extracting DNA, RNA, and protein using kits: is sample quantity or quality prejudiced?
William Mathieson1, Gerry A Thomas
1Department of Surgery and Cancer, Imperial College London, London W12 0NN, UK. bill.mathieson@imperial.ac.uk
Analytical Biochemistry
|October 17, 2012
Summary
Comparing DNA, RNA, and protein extraction kits, TriplePrep excelled in DNA and protein recovery, while AllPrep was superior for RNA. Neither kit fully met the high demands of omics research, compromising both yield and quality.
Area of Science:
- Biotechnology
- Molecular Biology
- Genomics and Proteomics
Background:
- Interdisciplinary "omics" research necessitates simultaneous extraction of DNA, RNA, and protein from single tissue samples.
- Stringent quality requirements for array-based technologies demand efficient multi-analyte extraction methods.
- Limited evaluation exists for commercially available kits designed for simultaneous biomolecule extraction.
Purpose of the Study:
- To compare the performance of TriplePrep (GE Healthcare) and AllPrep (Qiagen) kits for simultaneous DNA, RNA, and protein extraction.
- To evaluate the efficiency and quality of extracted nucleic acids and proteins across varying tissue qualities.
- To benchmark these kits against established single-analyte extraction methods.
Main Methods:
- Comparative analysis of TriplePrep and AllPrep kits using "good," "intermediate," and "poor" quality tissue blocks.
- Assessment of DNA yield, purity (A260/A280, A260/230), and integrity (gel electrophoresis).
- Evaluation of RNA yield, purity, integrity (RNA integrity numbers [RINs], quantitative reverse transcription polymerase chain reaction [Q-RT-PCR]), and protein yield and quality (two-dimensional difference gel electrophoresis [2D-DIGE]).
Main Results:
- Puregene DNA yields significantly exceeded those of both TriplePrep and AllPrep.
- AllPrep demonstrated comparable RNA yields and better inter-sample consistency than RNeasy, outperforming TriplePrep.
- TriplePrep showed higher protein yields and less alteration compared to AllPrep, but both kits yielded suboptimal protein recovery and quality relative to controls.
Conclusions:
- TriplePrep demonstrated superior performance in DNA and protein extraction compared to AllPrep.
- AllPrep proved more effective for RNA extraction, offering better yield and consistency.
- Neither simultaneous extraction kit achieved optimal efficiency, as both yield and quality were compromised for at least one biomolecule type, indicating a need for improved technologies for comprehensive "omics" workflows.
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