Teaching lab-made DNA to speak for microbes that refuse to grow

Most of the microbes in soil and ocean refuse to grow in laboratory dishes — and with them, their chemistry stays locked away. A team led by Prof. Lei Zhang at Jining Medical University found a way to read it anyway. Using already-characterized gene clusters as reference maps, they reconstructed fragmented biosynthetic gene clusters from environmental DNA — fragments that would previously have been discarded as unusable — and predicted what compounds the full pathways might make. Then they went beyond the computer: they chemically synthesized six candidate compounds and tested them across seven cancer cell lines, where two showed notable anti-cancer activity. Published in Microbiology Spectrum, the work is careful about what it claims — the candidates are prioritized starting points, not drugs, and mechanisms still need experiments. But it offers a practical route to the enormous chemical potential of microorganisms we cannot yet cultivate. "We connected computational mining of metagenomic data with experimental validation," said Zhang.