A new silicon chip writes DNA with electricity and water, hinting at cleaner data storage.
Silicon chips have run computers for half a century. A new device from Harvard gives them a different job. Instead of only processing information, this chip can write DNA, and it does so using electric currents and water rather than the harsh chemicals that DNA manufacturing has relied on for decades. The work points toward a future where vast amounts of digital data could be stored inside DNA itself.
The study appeared in the journal Nature Electronics, led by a team at the Harvard John A. Paulson School of Engineering and Applied Sciences under professor Donhee Ham.
The researchers built a silicon chip that synthesized 64 different DNA sequences at the same time, each up to 39 nucleotides long. That number matters. Earlier enzyme-based methods could produce only about a dozen sequences at once, so the chip roughly quintuples the previous benchmark for this cleaner approach.
How the DNA writing chip works
DNA is built one nucleotide at a time. After each building block is added, a temporary blocking group stops the strand from growing further until the next step is triggered. The chip controls this process with precise bursts of electricity rather than chemicals.
Its surface holds 64 synthesis sites, each ringed by two concentric electrodes surrounding anchored DNA molecules. The system works in a tightly controlled sequence:
– The inner electrode releases protons that lower the local acidity and trigger the next nucleotide to attach.
– The outer electrode absorbs any protons drifting outward, keeping the reaction locked to that single spot.
– Repeating the cycle across all sites builds 64 unique sequences independently and in parallel.
Co-first author Han Sae Jung said the chip did what the team asked, localizing low pH at selected sites. The limitation, Jung noted, came not from the silicon but from the deprotection chemistry that removes the blocking groups. That leaves a clear next step for researchers to develop a faster acid-driven chemistry that can keep pace with the chip.
Why DNA data storage matters for the AI age
The appeal of DNA storage comes down to density and durability. As artificial intelligence drives an explosion of new data, traditional media such as magnetic tape and hard drives face limits in how much they can hold, how long they last, and how much energy and space they consume. DNA is extraordinarily compact and can remain stable for very long periods, making it a candidate for archiving information at a scale that current hardware struggles to match.
The Harvard chip addresses one of the biggest obstacles in this field: writing DNA quickly and cleanly. Conventional DNA synthesis uses solvent-heavy chemistry that is difficult to scale and environmentally costly. A water-based enzymatic process running on a standard silicon chip offers a cleaner route. Co-author Woo-Bin Jung said that if the parallel synthesis could be scaled well beyond 64 sequences, enzymatic synthesis in water could offer an environmentally friendly way to write DNA at very large scale.
The benefits may reach beyond data storage. According to reporting by Medical Daily, cheaper DNA synthesis could lower the cost of gene therapies and personalized vaccines, which today can carry prices ranging from several hundred thousand dollars to more than 3 million dollars per treatment. Bringing down the cost of producing synthetic DNA at scale could make such medicine viable for a wider range of patients and health systems.
The chip is a laboratory milestone, not a finished product. The team was careful to frame it as a proof of concept, showing that a semiconductor can precisely orchestrate DNA synthesis site by site. Scaling from 64 sequences to the millions needed for practical data storage will require new chemistry that the current device cannot yet support.
Timelines in this area tend to be long. A promising result in the lab often needs years of further development before it reaches real-world use. The research drew on a multi-institution collaboration including Harvard, the Broad Institute, and other partners, with related patents filed through Harvard’s technology office.
The work fuses two fields that rarely meet, taking the silicon chip at the heart of modern computing and turning it into a tool for building the molecule of life. If the chemistry catches up, the same technology that stores today’s data on drives and servers may one day store it in strands of DNA, written by electricity and water on a chip small enough to hold in your hand.
