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Related Concept Videos

Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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Translation01:31

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Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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Initiation of Translation02:33

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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
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Esophageal varices are dilated, tortuous veins which are found mainly in the submucosa of the lower esophagus but which may also appear higher up or extend into the stomach. They develop due to increased pressure in the portal venous system, often as a result of liver cirrhosis. This condition scars and damages the liver, impeding normal blood flow through the portal vein. To compensate, blood seeks alternative pathways, forming fragile new vessels (varices) in the esophagus and stomach. These...
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The Controversial Link Between Human Papillomavirus Infection and Esophageal Health: An Exploratory Translational

Maximilian Egg1, Markus Wiesmüller1, Bertram Aschenbrenner1

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Human papillomaviruses (HPVs) may contribute to rare esophageal papillomatosis (EP). This study found HPV6 DNA and active viral infection markers in EP tissue, suggesting a potential role for HPV6 in EP development.

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HPV6esophageal papillomatosisesophageal squamous papilloma

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Area of Science:

  • Gastroenterology
  • Virology
  • Oncology

Background:

  • Esophageal papillomatosis (EP) is a rare esophageal proliferation.
  • The role of human papillomaviruses (HPVs) in EP development is controversial.
  • Existing literature reports approximately 57 EP cases.

Purpose of the Study:

  • To investigate the presence and activity of HPVs in esophageal papillomatous tissues, including EP.
  • To analyze viral transcriptional activity and infection markers in EP.
  • To assess the immune response to HPV6 in an EP case.

Main Methods:

  • Detection of HPV DNA in esophageal papilloma tissues.
  • Analysis of viral mRNA expression (E6/E7) and specific transcripts (E1^E4).
  • Serological testing for HPV6-specific neutralizing antibodies.

Main Results:

  • Low-risk HPV6 DNA was detected in a subset of esophageal papillomatous tissues, including EP.
  • Abundant E6/E7 mRNA and HPV6 E1^E4 transcripts indicating productive infection were found in EP tissue.
  • HPV6-specific antibodies were absent during natural infection but elicited after vaccination.

Conclusions:

  • The study suggests a possible involvement of HPV6 in the development of esophageal papillomatosis.
  • Findings support distinguishing EP from non-EP esophageal squamous papillomas.
  • Further research with larger sample sizes is warranted.