Abstract
Nucleic acid polymers can be evolved to exhibit desired properties, including molecular
recognition of a molecular target and catalysis of a specific reaction. These properties
can be readily evolved despite the dearth of chemical diversity available to nucleic
acid polymers, especially when compared to the rich chemical complexity of proteins.
Expansion of nucleic acid chemical diversity has therefore been an important thrust
for improving their properties for analytical and biomedical applications. Herein,
we briefly describe the current state-of-the-art for the sequence-defined incorporation
of modifications throughout an evolvable nucleic acid polymer. This includes contributions
from our own lab, which have expanded the chemical diversity of nucleic acid polymers
closer to the level observed in proteinogenic polymers.
1 Introduction
2 Polymerase-Catalyzed Synthesis of Modified Nucleic Acid Polymers
3 Ligase-Catalyzed Oligonucleotide Polymerization (LOOPER)
4 LOOPER with Small Modifications
5 LOOPER with Large Modifications
6 Evolution of Aptamers Derived from LOOPER Libraries
7 Outlook
Key words modified nucleic acids - modified aptamers - sequence-defined polymers - ligase -
in vitro selection - molecular evolution