Usually there are cDNA synthesis kit for microRNA but not for piRNA , previously we were using miScript RT II kit , but the product has been discontinued for now .If anyone can suggest any ideas.
Here are a few cDNA synthesis kits that are specifically designed for small RNA, including miRNA and piRNA, and that are available for shipment to India:
The NEBNext® Small RNA Conversion Kit
The Thermo Fisher Scientific Superscript III Reverse Transcriptase Kit
The Qiagen miScript II RT Kit
I recommend reviewing the product specifications and descriptions carefully to ensure that the kit you choose is suitable for your specific needs and applications. It may also be helpful to check with the manufacturer to confirm that the kit can be shipped to your location.
You could use any small RNA library preparation kit (for Illumina sequencing), and instead of having a sequencing readout just use qPCR. The only difference is that the miScript kit that you were using adds a polyA tail, while the library preparation kits will ligate an adapter.
For the miRNAs you can use TaqMan™ MicroRNA Reverse Transcription Kit (OR) TaqMan™ Advanced miRNA cDNA Synthesis Kit from Applied Biosystems™. After cDNA synthesis, you will need to order select miRNA assays to perform qPCR.
For piRNA, you can use custom design tool for primer design for qPCR,