NaV1.8 mRNA polyadenylation does not increase in the injured sciatic nerve. A: Schematic representation of PolyA Tail (PAT) assay. 1. Reverse transcription with oligo dT-Adaptor primer. 2. NaV1.8-specific PCR amplification with Adaptor primer. Amplicon length depends on polyA tail length. 3. Southern blot detection with digoxygenin (DIG)-labeled NaV1.8-specific probe after gel electrophoresis. Multiple polyA tail lengths result in smearing and multiple bands. B: Southern blot of PAT amplicons. ◂: NaV1.8 mRNA from both ipsilateral nerve and uninjured DRG tissue predominantly exhibits a discrete polyA tail < 50 bases long, with additional polyadenylation occurring out to 200 bases. Tissue was harvested 2 weeks after SNE.