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Diversity of Protists II01:27

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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
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Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
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Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
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A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.
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Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
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Protocol for Production of a Genetic Cross of the Rodent Malaria Parasites
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Human Plasmodium vivax diversity, population structure and evolutionary origin.

Virginie Rougeron1, Eric Elguero1, Céline Arnathau1

  • 1Laboratoire MIVEGEC (Université de Montpellier-CNRS-IRD), CREES, Montpellier, France.

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Plasmodium vivax causes over 200 million malaria cases globally. This study analyzes its population genetics and evolutionary history worldwide, revealing crucial insights into its origins and spread.

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Area of Science:

  • * Genetics and Evolutionary Biology
  • * Infectious Diseases and Epidemiology
  • * Global Health

Background:

  • * Plasmodium vivax is the most widespread malaria parasite, causing over 200 million clinical cases annually.
  • * Historically neglected due to lower mortality compared to Plasmodium falciparum, recent findings of drug resistance and severe cases highlight its significance.
  • * Significant knowledge gaps persist regarding P. vivax population genetics and evolutionary history, especially concerning African genetic data.

Purpose of the Study:

  • * To investigate the global population genetic structure and diversity of Plasmodium vivax.
  • * To explore the evolutionary origins of P. vivax and its introduction into the Americas.
  • * To address the lack of genetic data from Africa and improve understanding of P. vivax evolution.

Main Methods:

  • * Genotyping of 14 microsatellite loci.
  • * Analysis of 834 Plasmodium vivax samples.
  • * Samples were collected from 28 locations across 20 countries worldwide.

Main Results:

  • * Characterization of the worldwide population genetic structure and diversity of P. vivax.
  • * Insights into the evolutionary origin of P. vivax globally.
  • * Analysis of the introduction pathways of P. vivax into the Americas.

Conclusions:

  • * Genome-wide analyses are essential for unraveling the complex evolutionary history of Plasmodium vivax.
  • * This study provides critical genetic data, particularly from underrepresented regions, enhancing our understanding of P. vivax.
  • * Findings contribute to a more comprehensive view of malaria parasite evolution and global spread.