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Solid phase DNA amplification: characterisation of primer attachment and amplification mechanisms
1Department of Genomic Technology, Serono Pharmaceutical Research Institute, Chemin des Aulx 14, 1228 Plan les Oates, Geneva, Switzerland.celine.adessi@serono.com
Nucleic Acids Research
|October 12, 2000
Summary
Researchers optimized chemical methods for attaching DNA primers to glass surfaces for solid-phase PCR. The best method enables efficient DNA amplification without free primers, paving the way for DNA chip development.
Area of Science:
- Molecular Biology
- Biochemistry
- Materials Science
Background:
- Solid-phase PCR requires efficient immobilization of DNA primers onto a solid support.
- Traditional PCR uses freely diffusing primers, limiting applications in miniaturized systems.
- Surface-bound primers need specific chemical linkages that withstand reaction conditions and maintain accessibility.
Purpose of the Study:
- To evaluate and optimize chemical methods for 5'-end oligonucleotide attachment to glass surfaces for solid-phase PCR.
- To demonstrate DNA amplification using surface-bound primers without freely diffusing primers.
- To characterize novel surface amplification processes for DNA synthesis.
Main Methods:
- Testing various chemical methods for oligonucleotide immobilization on glass slides.
- Utilizing 5'-thiol-modified oligonucleotides and heterobifunctional cross-linkers for attachment to amino-silanised surfaces.
- Performing and analyzing interfacial and surface amplification processes.
- Quantifying newly synthesized DNA using radioactive and fluorescent hybridisation assays.
Main Results:
- Optimal attachment achieved using 5'-thiol-modified oligonucleotides on amino-silanised glass slides via a heterobifunctional cross-linker.
- Successful DNA amplification demonstrated using surface-bound primers, eliminating the need for freely diffusing primers.
- Characterization of two novel amplification processes: interfacial and surface amplification.
- Detection and quantification of amplified DNA confirmed the efficiency of the surface-bound primers.
Conclusions:
- The developed chemical method provides high surface coverage and robust oligonucleotide attachment for solid-phase PCR.
- Surface amplification offers a novel approach for DNA attachment to solid supports and DNA chip production.
- This technique presents a viable alternative for genomic studies and the development of advanced DNA-based technologies.