Construction of DGLA producing cell factory by genetic modification of Mucor circinelloides

Background: Dihomo-gamma linolenic acid (DGLA, 20:3, n-6) is the elongated product of Gamma linolenic acid (GLA, 18:3, n-6) catalyzed by the enzyme delta-6 elongase (D6E) or gamma linolenic acid elongase (GLELO). Construction of engineered oleaginous microbes have been attracting significant interest to produce DGLA because of its nutritional value and medicinal applications. Mucor circinelloides is a GLA producing filamentous fungus which can be a useful tool to produce DGLA. We have, therefore, overexpressed the D6E (GLELO) gene in this fungus to construct DGLA producing cell factory. Result: To produce DGLA in M. circinelloides, homologous overexpression of D6E (GLELO) gene was analyzed. When the gene was overexpressed in M. circinelloides CBS277.49, up to 5.72% DGLA was produced in this strain. Conclusion: To our knowledge, this is the first report describing the overexpression of D6E (GLELO) gene in M. circinelloides to construct DGLA producing cell factory. A new scope for further research has been established by this work for improved production of DGLA in this fungus, specifically in its high lipid-producing strain, WJ11.