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Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
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During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
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Somatic Mosaicism in Blaschkolinear Inflammatory Disorders.

Nicholas Theodosakis1, Lauren Levy1, Shawn Cowper1,2

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Linear inflammatory skin conditions, like lichen planus (LP) and discoid lupus erythematosus (DLE), may stem from somatic mosaicism. Further genetic research could uncover new therapeutic targets for these rare disorders.

Keywords:
BlaschkolinearGenodermatosesLinear

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Area of Science:

  • Dermatology
  • Genetics
  • Pathology

Background:

  • Linear lichen planus (LP) and linear discoid lupus erythematosus (DLE) are rare dermatologic conditions characterized by Blaschkolinear distribution of lesions.
  • Blaschkolinear disorders are increasingly linked to somatic mosaicism, suggesting a genetic basis for these conditions.
  • The late onset of linear LP and DLE implies a potential secondary trigger activating inflammatory responses in genetically predisposed keratinocytes.

Purpose of the Study:

  • To investigate the potential role of somatic mosaicism in linear inflammatory dermatoses.
  • To present histologically confirmed cases of linear LP and DLE.
  • To explore therapeutic responses and identify potential targets for future treatments.

Main Methods:

  • Histological confirmation of two cases of linear LP and one case of linear DLE.
  • Clinical observation of lesion behavior, including recurrence and regression patterns.
  • Assessment of patient response to various therapeutic interventions.

Main Results:

  • Both linear LP patients exhibited episodic lesion regression and recurrence in the same distribution.
  • Topical steroids and non-steroidal anti-inflammatories provided moderate symptomatic relief for LP.
  • The linear DLE patient showed a gradual response to hydroxychloroquine over 14 months.

Conclusions:

  • Linear inflammatory dermatoses like LP and DLE may represent localized variants of systemic disorders.
  • The Blaschkolinear presentation strongly suggests an underlying cause of somatic mosaicism.
  • Genetic investigation of these conditions is warranted to identify potential therapeutic targets.