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Lyonization pattern of normal human nails.

Mariko Okada1, Hiroaki Nishimukai, Tatsuyuki Okiura

  • 1Department of Medical Technology, Ehime Prefectural University of Health Sciences, Tako-oda, Tobe, Ehime 791-2101, Japan. mokada@epu.ac.jp

Genes to Cells : Devoted to Molecular & Cellular Mechanisms
|April 24, 2008
PubMed
Summary
This summary is machine-generated.

Human nail plates show unique X-inactivation patterns, remaining constant over time. This suggests progenitor cells maintain their composition, forming longitudinal bands within each nail.

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Area of Science:

  • Human genetics
  • Developmental biology
  • Nail biology

Background:

  • X-inactivation is a key process in female mammals.
  • Understanding X-inactivation patterns in human tissues provides insights into cellular development and tissue homeostasis.
  • Human nails offer a unique model for studying cellular composition due to their continuous growth and regeneration.

Purpose of the Study:

  • To investigate X-inactivation patterns in normal human fingernails and toenails.
  • To determine the stability and cellular composition of nail plates over time.
  • To estimate the number of progenitor cells involved in human nail development.

Main Methods:

  • DNA samples were extracted from individual finger and toe nail plates of nine female volunteers.
  • The human androgen receptor gene assay was employed to analyze X-inactivation patterns.
  • Statistical analysis, including the binomial distribution model, was used for cell estimation.

Main Results:

  • Each nail exhibited a unique and stable X-inactivation pattern for at least two years.
  • Approximately 25.9% of nails showed exclusive inactivation of one X-chromosome.
  • Nails with mixed cell populations displayed patchy mosaic distributions of X-inactivation patterns.
  • A correlation was observed between specific fingers and their corresponding toes, suggesting developmental links.

Conclusions:

  • Nail plate precursor cells maintain their composition at each site through regeneration cycles.
  • Nail plates appear to have a longitudinal band pattern based on X-inactivation.
  • The estimated number of nail plate progenitor cells during development is approximately three.
  • Observed correlations suggest a shared morphogenetic process for certain digits.