From oligonucleotide shapes to genomic SELEX: novel biological regulatory loops.

The SELEX method and oligonucleotide combinatorial chemistry discovery process yields high-affinity/high-specificity ligands for virtually any molecular target. Typically, the enormous starting libraries used in the SELEX process contain 10(14)-10(15) sequences. We now ask if the smaller sequences, complexity of extant organisms, and evolutionary history provide useful interactions between oligonucleotides and at least some unexpected targets. That is, do organisms contain a robust "linkage map" between their oligonucleotides and proteins and/or small molecules that enriches life?

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