Abstract: The present disclosure provides a technique for efficiently detecting a wider variety of RNA higher-order structures including non-Watson-Crick base pair-type higher order structures. The method for analyzing the RNA higher-order structure according to the present disclosure comprises the steps of providing a compound in which a target-binding moiety Sm and an RNA-modifying moiety Y are linked by a linker L; contacting the compound and one or a plurality of RNAs; determining a nucleotide sequence of the RNA after contacting with the compound; and determining a position and/or a region on the RNA that interacts with the target binding moiety of the compound, based on the nucleotide sequence.

Abstract: The invention provides a conjugate of functional oligonucleotide with poly(ethylene oxide), polyion complex of the conjugate with cationic polymer, and micelle thereof. The micelle improves stability of the oligonucleotide in animal cells and its specific bindability to target gene.

Abstract: The invention provides a conjugate of functional oligonucleotide with poly(ethylene oxide), polyion complex of the conjugate with cationic polymer, and micelle thereof. The micelle improves stability of the oligonucleotide in animal cells and its specific bindability to target gene.

Abstract: There are provided 2-aminopurine derivatives represented by the following general formula (1): where R represents any species selected from the group consisting of hydrogen and acyl groups, X represents any species selected from the group consisting of phosphoramidite and oligonucleotides, Y represents any species selected from the group consisting of dimethyltrityl groups and oligonucleotides, and Z1, Z2, Z3, Z4 and Z5 are the same or different and represent any species selected from the group consisting of hydrogen and hydroxyl, amino, lower alkyl, alkoxy, carboxyl and sulfonic acid groups, provided that Z1, Z2, Z3, Z4 and Z5 are not all hydrogen, as well as gene expression-regulating compositions characterized by comprising the derivatives. By introducing the 2-aminopurine derivatives into oligonucleotides it is possible to achieve crosslinking reaction with high reactivity for target nucleic acids and notably high base sequence specificity.