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Related Concept Videos

Fixing Double-strand Breaks02:04

Fixing Double-strand Breaks

The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
Fixing Double-strand Breaks02:04

Fixing Double-strand Breaks

The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Multiple Sclerosis l: Introduction01:19

Multiple Sclerosis l: Introduction

Multiple sclerosis is a chronic autoimmune disease of the central nervous system (CNS) that affects the brain, spinal cord, and optic nerves. It is an inflammatory demyelinating disorder and a leading cause of neurological disability in young adults.EpidemiologyMS commonly begins between 20 and 40 years of age and is twice as common in women. Its exact cause remains unclear, but genetic susceptibility contributes, with higher risk in first-degree relatives and identical twins. A greater...
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Bacterial Meningitis

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Related Experiment Video

Updated: Jun 14, 2026

Pseudofracture: An Acute Peripheral Tissue Trauma Model
10:08

Pseudofracture: An Acute Peripheral Tissue Trauma Model

Published on: April 18, 2011

[Nijmegen Breakage syndrome].

Melinda Erdos1, Beáta Tóth, Pálma Juhász

  • 1Debreceni Egyetem, Orvos- és Egészségtudományi Centrum Infektológiai és Gyermekimmunológiai Tanszék, Debrecen. melinda.erdos@yahoo.com

Orvosi Hetilap
|April 1, 2010
PubMed
Summary

Nijmegen Breakage syndrome is a rare genetic disorder. Mutations in the NBS1 gene cause this condition, affecting DNA repair and leading to immunodeficiency and developmental issues.

Area of Science:

  • Genetics
  • Immunology
  • Molecular Biology

Background:

  • Nijmegen Breakage syndrome (NBS) is a rare autosomal recessive disorder.
  • It presents with severe combined immunodeficiency, chromosomal instability, and increased cancer risk.

Observation:

  • Patients exhibit characteristic facial features, microcephaly, short stature, and intellectual disability.
  • The syndrome is linked to mutations in the NBS1 gene, crucial for DNA repair.

Findings:

  • NBS1 encodes nibrin, a key protein in the DNA damage response pathway.
  • Genetic analysis confirms NBS1 mutations as the causative agent.
  • The disorder represents an inborn error of innate immunity.

Implications:

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  • Understanding NBS1's role informs diagnosis and potential therapeutic strategies.
  • This research highlights the link between DNA repair defects and immune dysfunction.
  • Further studies can explore targeted therapies for NBS patients.