Mastodawn

@mzdravkov we've observed that in all runs, usually a few % of reads, sometimes over 10%. When you plot raw signals, you'll see strange stretches similar to homopolymer... we haven't observe anything like this in rna002, only in rna004.
my working hypothesis it that's because of helicase #stalling specific to new #RNA #helicase variant used in #rna004
@nanopore

Leszek Aug 13, 2025

@nanopore DRS sequencing temperature was lowered to 30/31C (#P2 / #MinION) in #minknow v24.06 (and all recent versions) slowing down RNA helicase from 130 bps to 100-110 bps, lowering yield per hour and affecting signal readouts.
In effect, recent and older #RNA004 runs differ in base- and modification calling quality, possibly pA tail estimates.
This change was not widely announced to the community apart from a brief mention in software release notes!
https://community.nanoporetech.com/posts/software-release-24-06-for
#academicChatter