RIP-chip (RNA immunoprecipitation chip) is a molecular biology technique which combines RNA immunoprecipitation with a microarray. The purpose of this technique is to identify which RNA sequences interact with a particular RNA binding protein of interest in vivo. It can also be used to determine relative levels of gene expression, to identify subsets of RNAs which may be co-regulated, or to identify RNAs that may have related functions. This technique provides insight into the post-transcriptional gene regulation which occurs between RNA and RNA binding proteins.

The genes fluorescently identified by the chip analysis are the genes whose RNA interacts with the original protein of interest. The strength of the fluorescent signal for a particular gene can indicate how much of that particular RNA was present in the original sample, which indicates the expression level of that gene.

Previous techniques aiming to understand protein-RNA interactions included RNA Electrophoretic Mobility Shift Assays and UV-crosslinking followed by RT-PCR, however such selective analysis cannot be used when the bound RNAs are not yet known. To resolve this, RIP-chip combines RNA immunoprecipitation to isolate RNA molecules interacting with specific proteins with a microarray which can elucidate the identity of the RNAs participating in this interaction. Alternatives to RIP-chip include: