Oligonucleotide microarrays with stem-loop probes: enhancing the hybridization of nucleic acids for sensitive analysis.
We have demonstrated that the dynamics of nucleic acid hybridization in microarrays depend on the physical structure of immobilized probes. We have immobilized oligonucleotide-3'-phosphates with and without stem-loop structure on epoxylated glass surface, followed by hybridization under different conditions, viz., hybridization buffer, pH condition, temperature and ionic strength. In a comparative study, we have established that array constructed using probes with stem-loop structure displayed approximately 2.2 times higher hybridization signals than the probes without it. The stem-loop DNA array format is simple and flexible in design and thus potentially useful in various DNA diagnostic tests.
Mahajan
Shweta
S
Nucleic Acids Research Laboratory, Institute of Genomics and Integrative Biology, Mall Road, Delhi University Campus, Delhi 110 007, India.
Swami
Archana
A
Sethi
Dalip
D
Kumar
P
P
Gupta
K C
KC
D006863:Hydrogen-Ion Concentration; D015394:Molecular Structure; D009693:Nucleic Acid Hybridization / Q000379:methods*; D009696:Nucleic Acids / Q000032:analysis*; D020411:Oligonucleotide Array Sequence Analysis / Q000295:instrumentation / Q000379:methods*; D015345:Oligonucleotide Probes / Q000737:chemistry*; D009994:Osmolar Concentration; D012680:Sensitivity and Specificity; D013499:Surface Properties; D013696:Temperature
D009696:Nucleic Acids; D015345:Oligonucleotide Probes