Genomics of the thermo-acidophilic red alga Galdieria sulphuraria

Guillaume G. Barbier; Marc Zimmermann; Andreas P. M. Weber

doi:10.1117/12.614532

22 September 2005 Genomics of the thermo-acidophilic red alga Galdieria sulphuraria

Guillaume G. Barbier, Marc Zimmermann, Andreas P. M. Weber

Proceedings Volume 5906, Astrobiology and Planetary Missions; 590609 (2005) https://doi.org/10.1117/12.614532
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

Extremophilic organisms dwell in environments that are characterized by high or low temperatures (thermophiles or psychrophiles), very low or high pH-values (acidophiles or alkalophiles), high salt concentrations (halophiles), high pressure (barophiles), or extreme drought (xerophiles). Many extremophiles are microbes, and many also belong to the prokaryota. Galdieria sulphuraria, however, is a member of a group of extremophilic eukaryotes that are named Cyanidiales. Cyanidiales are unicellular red micro-algae that occur worldwide in hot acidic waters, volcanic calderas, and in human-made acidic environments such as acidic mine drainage. G. sulphuraria has a unique position within the Cyanidiales because, in contrast to the other obligate photoautotrophic members of this group, it is able to grow photoautotrophically, mixotrophically, and heterotrophically. It is not only resistant to acid (pH 0) and heat (56^oC), but also to high salt (1.5 M NaCl), toxic metals, and many other abiotic stressors. This unusual combination of features such as thermophily, acidophily, resistance to a wide array of abiotic stressors, and an extraordinary metabolic plasticity make G. sulphuraria highly interesting model organism to study adaptation to extreme environments. We have started a genomics approach to gain insight into the biology of G. sulphuraria and to identify genes and gene products critical for survival under extreme conditions. To this end, we pursue a whole-genome, shotgun sequencing approach towards unraveling the genome sequence of G. sulphuraria. We report here on the status quo of the genome-sequencing project and we summarize what we have learned to date from the genome sequence about the biology of this truly unique extremophile.

Citation Download Citation

Guillaume G. Barbier, Marc Zimmermann, and Andreas P. M. Weber "Genomics of the thermo-acidophilic red alga Galdieria sulphuraria", Proc. SPIE 5906, Astrobiology and Planetary Missions, 590609 (22 September 2005); https://doi.org/10.1117/12.614532

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available