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Related Concept Videos

Gene-Environment Interactions01:20

Gene-Environment Interactions

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Gene expression is a dynamic process that is significantly influenced by environmental factors. This interaction underlies the complex nature of biological development and the phenotypic differences observed among individuals, even among those with identical genetic makeups. Factors such as radiation, temperature, behavior, nutrition, and stress play pivotal roles in determining how genes are expressed. The concept of the reaction range is central to understanding this interaction. It posits...
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Exon Recombination02:32

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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
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Prokaryotic Transcriptional Activators and Repressors01:58

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The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
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Structure of a Gene01:30

Structure of a Gene

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A gene is the fundamental unit of heredity. Every individual has two copies of each gene, one inherited from each parent. Although most people contain the same genes, there is a small fraction that is slightly different amongst people. A gene with a small difference in its sequence of DNA bases forms different alleles, contributing to different phenotypes.
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Bacterial Signaling01:30

Bacterial Signaling

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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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Related Experiment Video

Updated: May 31, 2025

Surgical Method for Virally Mediated Gene Delivery to the Mouse Inner Ear through the Round Window Membrane
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Surgical Method for Virally Mediated Gene Delivery to the Mouse Inner Ear through the Round Window Membrane

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How a gene fuels ear infections.

Sedigheh Delmaghani1, Aziz El-Amraoui1

  • 1Université Paris Cité, Institut Pasteur, AP-HP, Inserm, CNRS, Fondation Pour l'Audition, Institut de l'Audition, IHU reconnect, Progressive Sensory Disorders, Pathophysiology and Therapy Unit, Paris, France.

Elife
|January 22, 2025
PubMed
Summary

Frequent ear infections in Down syndrome are linked to the DYRK1A enzyme. Targeting this enzyme may offer new treatments for otitis media in individuals with Down syndrome.

Keywords:
DYRK1AMiddle eardown syndromegeneticsgenomicshearing losshuman samplesinflammationmouseotitis media

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Related Experiment Videos

Last Updated: May 31, 2025

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Area of Science:

  • Biochemistry
  • Genetics
  • Pediatrics

Background:

  • Down syndrome is associated with a higher incidence of otitis media.
  • The DYRK1A enzyme plays a crucial role in cellular development and function.

Discussion:

  • The DYRK1A enzyme is implicated in the pathogenesis of otitis media in Down syndrome.
  • Understanding the role of DYRK1A may elucidate mechanisms underlying recurrent ear infections.

Key Insights:

  • DYRK1A is a key factor in the development of frequent and severe otitis media in Down syndrome.
  • This enzyme represents a potential therapeutic target for otitis media.

Outlook:

  • Further research into DYRK1A inhibitors could lead to novel treatment strategies.
  • Therapeutic targeting of DYRK1A may reduce the burden of otitis media in the Down syndrome population.