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Naevus sebaceus (NS) is a common birthmark caused by HRAS mutations, leading to abnormal cell growth. Future treatments may target these specific signaling pathways for better outcomes.

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Area of Science:

  • Dermatology
  • Genetics
  • Oncology

Background:

  • Epidermal naevi are common mosaic disorders affecting 0.1-0.3% of newborns.
  • Naevus sebaceus (NS) is an organoid naevus presenting as a scalp plaque, a hamartoma with epidermal and adnexal elements.
  • NS lesions can develop benign or malignant secondary tumors, particularly after puberty.

Purpose of the Study:

  • To investigate the genetic basis of Naevus Sebaceus (NS).
  • To identify the molecular mechanisms driving NS development and secondary tumor formation.
  • To explore potential therapeutic targets for NS.

Main Methods:

  • Analysis of somatic mosaicism in lesional keratinocytes of NS.
  • Genetic sequencing to identify mutations in HRAS and KRAS.
  • Investigation of downstream signaling pathways including RAF-MEK-ERK and PI3K.

Main Results:

  • Somatic activating mutations in HRAS or KRAS were identified in NS keratinocytes.
  • The HRAS c.37G>C (p.Gly13Arg) mutation is present in over 90% of NS cases.
  • These mutations lead to constitutive activation of key cell proliferation signaling pathways.

Conclusions:

  • Naevus sebaceus is driven by specific somatic mutations in HRAS or KRAS.
  • These mutations are present in NS and associated secondary tumors.
  • Understanding these signaling pathways opens possibilities for targeted medical therapies for NS.