Bis2C.Lecture8_2

Bis2C.Lecture8_2 - Symbioses and Humans Bis2C: Lecture 8...

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Symbioses and Humans Bis2C: Lecture 8 October 8, 2008
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Goals of lecture • Goal is to teach you how to think about the diversity of bacteria, archaea and microbial eukaryotes • Key facts are in the book reading • Key concepts are covered in lecture • Not expecting regurgitation of exact details from lecture • But should understand concepts (e.g.) How to build a tree of life How to study extremophiles How to determine the evolutionary history of phenotypes
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Outline I. Introduction II. Pathogens III. Commensals and the uncultured
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I. Introduction
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Symbioses • Definition of symbiosis • Intimate association between at least two different organisms in which at least one of them benefits
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Classes of symbiosis • Classes of Symbiosis A B Mutualism + + Commensalism + 0 Parasitism + -
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II. Pathogens (and phylogeny)
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II. Some terms • Pathogens are infectious agents that cause a disease (can be considered a subclass of parasites) • Pathogenicity = ability to enter a host and cause disease • Virulence = degree of pathogenicity
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• Battle over short at long time scales Pathogen tries to acquire resources and be transmitted Host tries to prevent invasion and kill or inhibit the pathogen • Host responses
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Bis2C.Lecture8_2 - Symbioses and Humans Bis2C: Lecture 8...

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