Direct RNA-Seq Project Shows Nanopore Sequencing Can Reveal New Insights into Basic Biology: Winston Timp, JHUSubmitted by Ayanna Monteverdi on Tue, 02/06/2018 - 09:59
Nanopore sequencing has arrived. Passing test after test this past year--including one we discuss today--this technology which was being hyped decades ago is delivering on its promise.
Winston Timp joins us today. He's an assistant professor at Johns Hopkins and one of the leaders on a recent large scale project to directly sequence RNA on an array of nanopores. Winston's is the first in a series of shows we've lined up with users of Oxford Nanopore's technology.
Why RNA-seq? Hasn’t this been done for years?
Yes, says Winston, but in the past no one has been looking at the RNA itself. They’re usually making cDNA from the RNA and sequencing that.
“One of the big advantages to nanopore sequencing, is that you can characterize any polymer you can put in the pore.”
Nanopore sequencing is polymer agnostic.
So what good does it do to look at the RNA directly? Ever heard of epitranscriptomics? Winston has worked for a while on DNA methylation in his lab. Now he’s looking at RNA methylation. Not only is he seeing basic biology that we've never seen before (unique isoforms, exon connectivity that has been imputed by informatics but never seen directly), he’s coming up with new translational questions for health and disease.
When we started Mendelspod seven years ago, the next gen sequencing race was in full swing. It was all about the push to bring down the price of sequencing. The lower cost brought an excitement to the world of biology with all the new projects it made possible. But we found out there were was a major limitation to the technology. Read length. Over the past couple years, PacBio paved a whole new world with their long reads that enabled many new genomic projects. BioNano gave us the big picture with their optical mapping. Today users of nanopore sequencing are generating reads of 1 megabase and the versatility of the nanopore is giving scientists even newer views of biological activity. The race is still very much on.