INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Genetic roots of lager-brewing yeast: Saccharomyces eubayanus and the Patagonian hypothesis
Autor/es:
LIBKIND, DIEGO; HITTINGER, C; GONCALVES, P; SAMPAIO, JP
Lugar:
Portland
Reunión:
Congreso; World Brewing Congress; 2012
Institución organizadora:
ASBC
Resumen:
The Lager-brewing yeast (Saccharomyces pastorianus) is a domesticated microbe arising through the hybridization between S. cerevisiae (Ale yeast) and a cryotolerant Saccharomyces relative as a result of cold brewing practices that Bavarian brewers made famous in the 15th century. Despite being available as pure culture since late 1800 its hybrid genetic nature was only discovered a few decades ago. So far all the industrial or wild strains isolated of cold adapted Saccharomyces have been discarded as progenitor candidates due to considerable genetic dissimilarities or due to hybrid condition. Recently, a worldwide survey yielded a novel yeast dubbed S. eubayanus from Patagonian native forests of Argentina which was shown to be the closest known match (99.5%) to the non-Ale portion of Lager yeasts and thus its putative progenitor. Identifying the wild genetic stock of the cryotolerant side of S. pastorianus allowed resolving the hitherto confusing taxonomy of the most relevant brewing yeast, and the understanding of key events that led to the domestication of lager yeast. For example, specific genetic changes related to sugar and sulfite metabolism were detected in Lager yeasts when compared to S. eubayanus. Furthermore, the available information relevant to the discussion on how and when such half European and half Patagonian yeast hybrid might have been originated will be addressed in this presentation.