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Related Concept Videos

Eukaryotic Evolution01:24

Eukaryotic Evolution

The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
Leishmaniasis01:30

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Leishmaniasis is a protozoal disease caused by species of the genus Leishmania and transmitted through the bite of infected female sandflies. The parasite exists in two principal morphological forms during its life cycle. A sandfly acquires intracellular amastigotes from an infected reservoir host, such as a dog. Within the sandfly, these forms differentiate into motile, flagellated promastigotes. During a subsequent blood meal, promastigotes are injected into the human host, where they...
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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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Leishmaniasis is a widespread parasitic disease caused by several Leishmania species. It affects millions of people each year and remains a major public health problem in endemic regions. First-line treatment relies on pentavalent antimonials, including meglumine antimoniate and sodium stibogluconate. Even so, how these drugs work has not been fully clear, especially their interaction with parasite-specific biochemical pathways. One key target is trypanothione reductase (TR), an enzyme that...
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The origin of life on Earth is a complex and enigmatic event rooted in ancient biochemical processes and geological conditions. Experimental evidence supports the hypothesis that life began with the spontaneous formation of organic molecules such as RNA nucleotides, amino acids, and lipids under early Earth conditions. Factors like volcanic activity, intense UV radiation, and a reducing atmosphere without free oxygen likely facilitated these reactions. Hydrothermal vents on the ocean floor are...
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Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.Phylogenetic trees illustrate the evolutionary relationships among these organisms. Scientists infer organisms’ common ancestry by evaluating shared morphological and genetic characteristics. Together, the fossil...

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In Vivo Infection with Leishmania amazonensis to Evaluate Parasite Virulence in Mice
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Leishmania: origin, evolution and future since the Precambrian.

Felipe Francisco Tuon1, Vicente Amato Neto, Valdir Sabbaga Amato

  • 1Department of Infectious Diseases, University of São Paulo, Medical School, São Paulo, Brazil.

FEMS Immunology and Medical Microbiology
|July 18, 2008
PubMed
Summary
This summary is machine-generated.

The origin of leishmaniasis, a parasitic disease, is explored through evolutionary history and ecological factors. Modern molecular techniques, like PCR in paleoparasitology, aid in understanding its evolution for vaccine development.

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Area of Science:

  • Parasitology and evolutionary biology.
  • Investigating the deep evolutionary history of protozoan parasites.

Background:

  • Leishmaniasis is a global parasitic disease with an uncertain evolutionary origin.
  • Theories regarding its origin span from ancient geological eras to the emergence of humans.

Observation:

  • The review examines the parasite's ancestral origins, potential vectors, and hosts.
  • Ecological shifts and their impact on parasite-host dynamics are considered.
  • Recent advancements in molecular techniques, including PCR, offer new insights.

Findings:

  • Molecular data has clarified some evolutionary pathways of Leishmania but also raised new questions.
  • Paleoparasitology, utilizing PCR, is instrumental in resolving remaining evolutionary uncertainties.
  • The evolutionary trajectory involves ancient origins, Mesozoic passage, and association with human appearance.

Implications:

  • A comprehensive understanding of leishmaniasis evolution is crucial for effective disease control.
  • Elucidating evolutionary history is fundamental for developing a targeted and efficient vaccine against Leishmania.
  • This knowledge can inform strategies to combat the global burden of leishmaniasis.