HMN 2025: How Yeast mutant pressure boosts omega-7 fatty acid manufacturing

Scientists from the Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT) of the Chinese Academy of Sciences have developed a lipid-rich mutant pressure of Saccharomyces cerevisiae utilizing a high-throughput, label-free screening method, opening new potentialities for microbial manufacturing of palmitoleic acid—an omega-7 fatty acid with confirmed anti-inflammatory and metabolic advantages.

The findings, revealed in Biotechnology for Biofuels and Bioproducts, deal with a crucial problem in producing palmitoleic acid, which is scarce in typical oil crops.

Currently, the fatty acid is primarily sourced from crops like sea buckthorn and macadamia, whose cultivation is restricted by geographic constraints and low yields. While S. cerevisiae naturally produces palmitoleic acid, its low complete lipid content material has blocked industrial-scale functions.

To overcome this, the analysis staff used a mixed mutagenesis method—using zeocin, an antibiotic-based mutagen, and Atmospheric and Room Temperature Plasma (ARTP)—to create a various library of yeast mutants. They then deployed FlowRACS, a Raman movement cytometry system, to pick dwell yeast cells with elevated lipid ranges by analyzing their intrinsic single-cell Raman spectra, eliminating the necessity for chemical stains or genetic reporters.

This technique recognized the mutant pressure MU2R48, which achieved a lipid content material of 40.26%—a 30.85% improve over its parental pressure SC018—whereas sustaining related biomass manufacturing.

“FlowRACS permits label-free, non-invasive number of lipid-producing cells at single-cell decision,” stated Ji Xiaotong, co-first writer of the review, and a postdoctoral fellow at QIBEBT. “It straight connects phenotype to operate with out requiring genetic modification or chemical labeling.”

Multi-omics evaluation revealed that MU2R48’s enhanced lipid accumulation stems from coordinated metabolic modifications: elevated exercise in glycolysis, ethanol degradation, and the pentose phosphate pathway boosted manufacturing of acetyl-CoA and NADPH—key constructing blocks for fatty acid synthesis—whereas fatty acid breakdown pathways had been suppressed.

This metabolic reshaping illustrates how focused mutagenesis and superior screening can collaboratively optimize microbial manufacturing. The mutant pressure offers a possible basis for the biosynthesis of palmitoleic acid, as famous by the staff.

The study underscores the worth of mixing superior cell-sorting applied sciences with multi-omics evaluation to develop high-performance microbial strains with out transgenic strategies.