Researchers at the Broad Institute and MIT have created a cellular self‑reporting approach that lets living cells package their own transcriptomes into virus‑like particles and release them into the culture medium. By simply sampling the medium, extracting RNA, and sequencing, scientists can repeatedly obtain gene‑expression snapshots from the same cell population without killing the cells, enabling true temporal tracking.
The method engineers a retroviral structural protein to embed in the cell membrane, where it recruits cellular RNA, forms a capsid‑like particle, and buds off. Compared with traditional single‑time‑point lysis or mechanical biopsies, this molecular solution is easier to implement and broadly applicable to time‑dynamic studies in typical life‑science labs.
The team demonstrated the technique in immortalized human cells, cancer lines, stem cells and derived neurons, as well as primary donor cells. By tagging particles from different cell types in co‑culture, they could distinguish mixed‑cell signals. They also applied it to 3‑D endothelial spheroids and organ‑on‑a‑chip devices, capturing short‑term transcriptional responses to stimulation and revealing how fibroblast source (uterus vs. lung) influences vascular gene programs.
Future work aims at single‑cell resolution, and the authors hope the method will become a convenient tool for researchers to monitor how cells and tissues change over time. Review