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This lesson explains the definition, classification, and characteristic features of an electrophile that are key features of nucleophilic substitution reactions. An analysis of their charge and orbital picture helps understand their reactivity for seeking electrons. Electrophiles can be classified into positive and neutral species. Other classes include free radicals and polar functional groups.
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DNA Distortion and Damage
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Prph2 mutations as a cause of electronegative ERG.

Rola Ba-Abbad1, Anthony G Robson, Yew C Yap

  • 1*Moorfields Eye Hospital, London, United Kingdom; †UCL Institute of Ophthalmology, London, United Kingdom; and ‡Department of Ophthalmology, King Abdulaziz University Hospital, Riyadh, Saudi Arabia.

Retina (Philadelphia, Pa.)
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Summary

Mutations in the PRPH2 gene can cause negative electroretinograms in patients with maculopathy. This finding broadens the understanding of PRPH2-related retinal diseases and their varied presentations.

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Area of Science:

  • Ophthalmology
  • Genetics
  • Molecular Biology

Background:

  • The PRPH2 gene encodes peripherin-2, a protein crucial for photoreceptor function.
  • Mutations in PRPH2 are associated with various retinal dystrophies, including retinitis pigmentosa and macular degeneration.
  • Electrophysiological testing, particularly the electroretinogram (ERG), is vital for diagnosing retinal disorders.

Observation:

  • This study identified six patients with PRPH2 mutations presenting with clinically evident maculopathy.
  • All patients exhibited electronegative electroretinograms, characterized by a reduced b-wave to a-wave amplitude ratio.
  • Specific PRPH2 mutations identified included missense (p.R172W) and frame-shifting (p.D87fs, p.Q132fs) variants.

Findings:

  • PRPH2 mutations are a newly identified cause of electronegative electroretinograms.
  • The association between PRPH2 mutations and negative ERGs was observed across different mutation types and disease severities.
  • Photopic On- and Off-response recordings aided in detecting On-pathway dysfunction.

Implications:

  • This expands the known phenotypic spectrum of PRPH2 mutations.
  • Negative electroretinograms should be considered in the differential diagnosis of patients with PRPH2 mutations.
  • Further research into the genotype-phenotype correlations of PRPH2 is warranted.