Microorganism Evolution
Microorganism Evolution - Related Videos
06:03
Procedure for Adaptive Laboratory Evolution of Microorganisms Using a Chemostat
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Cited by 11 •
2016
Here, we present a protocol to obtain adaptive laboratory evolution of microorganisms under conditions using chemostat culture. Also, genomic analysis of the evolved strain is discussed.
12:02
Molecular Evolution of the Tre Recombinase
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Cited by 4 •
2008
Here we report the generation of Tre recombinase through directed, molecular evolution. Tre recombinase recognizes a pre-defined target sequence within the LTR sequences of the HIV-1 provirus, resulting in the excision and eradication of the provirus from infected human cells. While still in its infancy, directed molecular evolution will allow the creation of custom enzymes that will serve as tools of molecular surgery and molecular medicine.
09:57
Quantifying Environmental Microorganisms and Viruses Using qPCR
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2023
Source: Laboratories of Dr. Ian Pepper and Dr. Charles Gerba - The University of Arizona Demonstrating Author: Bradley Schmitz Quantitative polymerase chain reaction (qPCR), also known as real-time PCR, is a widely-used molecular technique for enumerating microorganisms in the environment. Prior to this approach, quantifying microorganisms was limited largely to classical culture-based techniques. However, the culturing of microbes from environmental samples can be particularly challenging, and...
01:29
Types of Microorganisms
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2025
Microorganisms are a diverse group of microscopic entities broadly categorized into cellular and acellular types based on their structural organization. Cellular microorganisms include bacteria, archaea, fungi, protozoa, and algae, while acellular microorganisms are represented by viruses.Cellular MicroorganismsBacteriaBacteria, tiny prokaryotic organisms, exhibit fascinating shapes such as rods, spheres, and spirals. They adapt to diverse habitats, including soil, water, and human-associated...
01:18
Mutations in Microorganisms
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2025
Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...
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Mutations alter genetic information, while genetic recombination reshuffles existing genetic material and can create new trait combinations. Horizontal gene transfer adds another route by allowing genetic material to move between microorganisms. Together, these processes increase population diversity and can supply traits that later influence survival, metabolism, or responses to antimicrobial conditions.
Natural selection favors heritable traits that improve survival or reproduction under particular environmental conditions, making those traits more common over generations. Genetic drift changes trait frequencies through chance rather than adaptive advantage. Distinguishing these processes helps explain whether population change reflects environmental filtering or random shifts, especially when studying microbial diversity.
Environmental conditions determine which heritable traits provide an advantage or impose a disadvantage. Stress, resource availability, and antimicrobial exposure can therefore shift population diversity by favoring microorganisms with traits suited to those conditions. This relationship explains how evolutionary change can produce altered metabolism, improved stress survival, or resistance-related traits in changing environments.
Horizontal gene transfer can rapidly add genetic information to a microorganism rather than relying only on changes accumulated through reproduction. When transferred material affects antimicrobial response or metabolism, it may expand the traits present within a population. This mechanism is therefore important for understanding how microbial populations acquire useful or medically significant capabilities.
Evolutionary analysis helps researchers understand how disease-associated microorganisms change and how traits such as antibiotic resistance arise or spread within populations. That knowledge can inform antimicrobial development by identifying evolutionary pressures and responses that affect treatment effectiveness. It also contributes to interpreting the emergence of infectious diseases in biological and environmental contexts.
Tracking pathogen transmission through an evolutionary perspective can connect changes in heritable traits with the movement of microbial populations. Comparing population diversity and trait patterns helps researchers examine how pathogens change as they spread. This information supports investigations of infectious disease emergence and provides context for understanding transmission-related patterns in biology.
Evolutionary changes can identify microbial adaptations with potential value in industrial, environmental, and medical biotechnology. The same processes also help explain how microorganisms influence ecosystems and biogeochemical cycles, because changing traits can affect metabolism and survival under different conditions. Studying these adaptations connects population-level change with practical applications and environmental function.