Question: Conversion read counts to TPM for microRNAs
gravatar for lessismore
2.2 years ago by
lessismore880 wrote:

Dear all,

im planning to make some visualization with microRNA data. I have a doubt. I received the read counts for a number of identified microRNAs and i want to convert these numbers to TPM. According to the formula here you need to :

1 - Divide the read counts by the length of each gene in kilobases. This gives you reads per kilobase (RPK).

this for miRNA doesnt make much sense so could be skipped, correct?

2 - Count up all the RPK values in a sample and divide this number by 1,000,000. This is your “per million” scaling factor.

doubt: all reads in a sample? or all reads mapped to identified miRNAs (so the sum of the read counts i received)?

3 - Divide the RPK values by the “per million” scaling factor. This gives you TPM.

thanks in advance for your help (or references if you have)

mirna tpm • 1.4k views
ADD COMMENTlink modified 2.2 years ago by Buffo1.8k • written 2.2 years ago by lessismore880

TPM converting formula:

 TPM (transcript per million) values TPM = (miRNA total reads/total clean reads) × 1000000
ADD REPLYlink written 2.2 years ago by Sam140
gravatar for Buffo
2.2 years ago by
Buffo1.8k wrote:

TPM is not suitable for miRNAs, you can not normalize by transcript length for matures miRNAs. You can find some alternatives for miRNAs here

ADD COMMENTlink written 2.2 years ago by Buffo1.8k
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