Types of small RNA and the need for a separate small RNA kit

Most common types of small RNA:

Abbreviation

Name

Length

Description

miRNA

microRNA

18-25 nt

Inhibit translation of mRNA.

siRNA

small interfering RNA

20-25 nt (longer has been reported)

Cleave mRNA

piRNA

Piwi-interacting RNA

24-31 nt

Silence transposons in the germline

Why is a separate small RNA kit required? The small RNAs are too small to be captured by the Total RNA and mRNA library preparation kits. Library fragments generated from such small RNAs are not faithfully retained during bead clean-up steps.

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