I am new to tophat. I need to find some fusion genes from rna-seq data. I am using --mate-inner-dist 130. I am confused whether to use default value for --mate-std-dev or to calculate it somehow. If it is advisable not to use dafault, how can I calculate --mate-std-dev value. How the output (finding of fusion genes) is affected by the value of these parameters?
2 answers
TopHat-Fusion makes use of the interval mate_inner_dist ± mate_std_dev when it tries to find fusions.
It is probably not something that you can directly calculate rather estimate from the sample preparation. It should correspond to the expected width of the histogram of your DNA fragments.
In general I would not fret too much about it, set it fairly large first (80, 100) see what happens.
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