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A novel method of screening thrombin-inhibiting DNA aptamers using an evolution-mimicking algorithm.
Kazunori Ikebukuro1, Yuji Okumura, Koichi Sumikura
1Department of Biotechnology and Life Science, Tokyo University of Agriculture & Technology 2-24-16 Naka-machi, Koganei, Tokyo 184-8588, Japan. ikebu@cc.tuat.ac.jp
Nucleic Acids Research
|July 9, 2005
Summary
Researchers developed a novel algorithm to screen DNA aptamers for thrombin inhibition. This evolution-mimicking method identified highly effective thrombin inhibitors, improving upon traditional SELEX techniques.
Area of Science:
- Biochemistry
- Molecular Biology
- Bioinformatics
Background:
- DNA aptamers are effective thrombin inhibitors.
- Systematic Evolution of Ligands by Exponential Enrichment (SELEX) can fail to identify potent inhibitors.
- A new method is needed to screen aptamers based on inhibitory function.
Purpose of the Study:
- To develop a novel method for screening DNA aptamers based on their thrombin-inhibiting activity.
- To identify new, highly effective thrombin inhibitors using an evolution-mimicking algorithm.
Main Methods:
- Developed an evolution-mimicking algorithm for aptamer screening.
- Synthesized and tested 15-mer oligonucleotides for thrombin inhibition.
- Used in silico shuffling and mutation to generate next-generation aptamers.
- Extended aptamer sequences with 8-mer oligonucleotides to enhance inhibitory activity.
Main Results:
- Successfully identified known thrombin-inhibiting aptamers with high activity.
- The novel algorithm identified aptamers with enhanced thrombin-inhibiting activity compared to initial sequences.
- Extended aptamers demonstrated superior inhibitory effects after two cycles of in silico evolution.
Conclusions:
- The developed evolution-mimicking algorithm is effective for screening thrombin-inhibiting DNA aptamers.
- This method can identify aptamers with higher inhibitory activity than those found by traditional SELEX.
- Sequence optimization through in silico evolution significantly enhances aptamer efficacy.