If you spend enough time on social media, it can seem like every day there’s a celebration of something. (We’re still waiting for National Pancake Day to become an official day off here at Quantabio.) Today, though, is something really special for our community, and that’s DNA Day.
DNA Day landed on April 25 to commemorate two critical milestones for our recognition of this important molecule: the discovery in 1953 of the double helix structure of DNA, and the final publications of the first human genome sequence in 2003. Fifty years from the first grainy image of DNA to a nearly base-by-base map of a whole genome. That’s pretty amazing!
Of course, the discoveries didn’t stop there. Progress in the genomics community has continued at a breathtaking pace. Here are five technology milestones since that first DNA Day that we have marveled at over the years.
NGS: The first human genome was generated with Sanger sequencing, but most of the millions of genomes that have followed have been sequenced with next-generation sequencing. The advent of these technologies beginning around 2004, with their impressive throughput and rapidly falling prices, democratized access to genomic analysis. Long-read sequencing produced entirely new capabilities for genome analysis, and the latest generation of NGS tools continues to deliver improvements in capacity, quality, and affordability.
Ancient DNA: The first sequence of a Neanderthal genome was jaw-dropping — and the science of analyzing ancient DNA samples has flourished ever since. Scientists have learned so much about our ancestors this way, from their diet to their migration patterns to interbreeding between ancient hominid species. One of the most fascinating parts of this story came from the technical advances in sample preparation that were needed to work with such degraded, highly fragmented, minuscule samples collected from fossils.
T2T genome. Nearly two decades after the completion of the Human Genome Project, scientists published what could more accurately be described as the first human genome sequence — a telomere-to-telomere sequence without the gaps seen in the original genome assembly. The T2T genome filled in the last 8% of sequence that had been unknown, with about 200 million base pairs of new sequence data.
CRISPR. The discovery of CRISPR gene editing rapidly shifted our community from a focus on reading DNA in order to understand disease toward seeing the potential for editing DNA to cure disease. Harnessing this naturally occurring mechanism for cutting and healing DNA — and later, thanks to base editing, swapping in different DNA sequences — has been transformative for the field of gene therapy.
Spatial and single-cell biology. Initial genome sequencing occurred with a bulk-analysis approach. But innovations in spatial biology finally allowed scientists to analyze DNA in situ, and the development of single-cell tools made it possible to reveal the differences in DNA across cell types and tissues. Overall, both of these technical advances have given scientists the ability to study and appreciate the heterogeneity of our DNA in a completely new way.
Even as we look back on all of these great achievements, we’re imagining the exciting innovations that might come next. Here’s to many more great reasons to celebrate DNA Day!