Fluorescence in situ hybridization method for co-localization of mRNA and GEP

Co-localization studies using green fluorescent protein (GFP) and fluorescence immunohistochemistry have become commonplace. However, co-localization studies using GFP and mRNA in situ hybridization are rare, in large part because typical in situ hybridization reaction conditions often lead to the loss of GFP fluorescence. Here, we describe a new fluorescence mRNA in situ hybridization protocol using cRNA riboprobes that leaves GFP fluorescence intact. This protocol is based on a urea-based hybridization buffer and the Tyramide Signal Amplification system. This protocol should provide researchers engaged in the use of GFP with a solid starting point for adapting their own in situ hybridization protocols.