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Matters Microbial #79: How Amoebae Beat the Heat - A Deep Dive into Extremophilic Single-Celled Eukaryotes
0:00 Introduction: Dr. Mark Martin introduces the podcast, Matters Microbial, focusing on microbiology and microbial centrism.
0:26 Guest Introduction: Dr. Angela Oliverio, an Assistant Professor specializing in extremophilic single-celled eukaryotes, is introduced.
2:52 Eukaryotic Centrism: The discussion starts with a critique of the usual focus on eukaryotes (organisms with nuclei) like animals and plants.
3:04 Defining "Eukaryotes" vs. "Prokaryotes": A brief explanation distinguishing eukaryotes (with nuclei) from prokaryotes (bacteria and archaea, lacking nuclei).
4:52 Focusing on Single-cell Eukaryotes: Oliverio explains the historical background of single cell eukaryotes ("protists", a term that is a bit controversial).
5:35 The "Gray Space": Microbial eukaryotes (protists) are highlighted as a neglected area of study, falling between the well-studied eukaryotes (plants, animals, fungi) and prokaryotes.
8:52 Protest Diversity: The morphological diversity is stated to be stunning.
9:25 Genetic Code Anomalies: The discovery of variant genetic codes in some protists (ciliates and heterolobosea) challenges fundamental biological assumptions.
10:52 Testate Amoebae: Discussion shifts to testate amoebae, which create intricate shells, sometimes using the "skeletons" of their prey (diatoms).
15:48 Extremophiles as a Source of Novelty: Extreme environments are identified as key locations for discovering novel microbial life, particularly within bacteria and archaea.
16:38 Thermophiles and Acidophiles: The focus narrows to thermophiles (heat-loving) and acidophiles (acid-loving) organisms, and the intersection of these traits.
18:11 Temperature and pH Optima of Eukaryotes: Oliverio discusses a paper from her lab reviewing the temperature and pH tolerances of various eukaryotic lineages, highlighting amoebae as surprisingly thermotolerant.
20:22 Mystery of Amoebae's Heat Tolerance: The discussion highlights the lack of knowledge regarding the mechanisms behind the high-temperature tolerance of certain amoebae.
23:03 Fieldwork at Lassen Volcanic National Park: The research team's fieldwork at Lassen Volcanic National Park is described, focusing on collecting samples from geothermal springs.
24:57 Sample Collection: Collection was done at neutral pH sites.
25:32 Culturing Amoebae: The simple yet effective method of culturing amoebae using wheat berries in water samples from the field is detailed.
27:25 Axenic Growth (Co-culture): The amoebae are grown in co-culture with a consortium of bacteria from their original environment (axenic growth).
29:28 Amoeba Diversity Recovered: The lab successfully cultured 12-15 distinct lineages of amoebae, showing high diversity.
30:56 High-Temperature Tolerance Limit Broken: An amoeba (DBS samples) was found to replicate at 62°C, surpassing the previously known upper temperature limit for eukaryotic replication (60°C).
32:20 Temperature Optima: The optimal growth temperature for this amoeba is estimated to be around 54°C, with slower growth at 62°C.
33:53 Genomic and Metagenomic Approaches: The use of long-read sequencing and genome-resolved metagenomics to study these amoebae and their associated microbes is emphasized.
36:29 Giant Viruses: The discovery of giant viruses potentially infecting the amoebae is mentioned.
36:53 Microscopy and Motility: Collaboration with another lab (Dyche Mullins's lab at UCSF) enables high-temperature microscopy, revealing two types of amoeba motility (pseudopodia and lamellipodia).
38:41 Observation at High Temperatures: The amoebae are observed to be motile and feeding at 64°C, even though they don't replicate at this temperature.
41:50 Future Directions: Future research directions include comparative genomics, studying related mesophilic amoebae, and investigating potential conserved mechanisms with thermophilic archaea.
43:16 Unintentional Fungi Culture: Fungi were accidentally cultured, identified as related to chytrids, which are often considered parasites.
45:55 Potential Relevance to Human Health: The discussion of the connection to human health centers around "free-living" amoeba, some of which are related to the amoeba being studied, serve as "Trojan Horses," potentially harboring bacterial pathogens.
49:19 Biotech Potential: The potential for discovering novel enzymes and proteins with biotechnological applications from these extremophiles is highlighted.
51:57 Path to science: Oliverio was a double major in Philosophy and did not take Biology until later in her college career.
53:09 Importance of Undergraduate Research: Taking an intro bio course with Dr. Laura Katz at Smith College, who encouraged undergraduate research, was a pivotal moment.
56:35 Conclusion: The podcast emphasizes curiosity and an interest in exploring new possibilities.