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Related Experiment Videos

Variable keratin polypeptide profile in human stratum corneum.

M Yaar1, G A Matoltsy, B A Gilchrest

  • 1Cutaneous Gerontology Laboratory, USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111.

Journal of Dermatological Science
|July 1, 1990
PubMed
Summary
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This study analyzed keratin patterns in human skin, revealing significant inter-individual variations. These differences in keratin expression may stem from genetic variations or protein modifications.

Area of Science:

  • Biochemistry
  • Genetics
  • Dermatology

Background:

  • The stratum corneum, the outermost layer of the skin, is primarily composed of keratin proteins.
  • Keratins provide structural integrity and protection to the skin.
  • Understanding keratin expression is crucial for comprehending skin structure and function.

Purpose of the Study:

  • To investigate inter-individual variations in keratin protein expression in the human stratum corneum.
  • To explore potential genetic or post-transcriptional bases for these variations.
  • To analyze keratin patterns across three generations within families.

Main Methods:

  • Stratum corneum samples were collected from 46 individuals across seven families.
  • Gel electrophoresis was employed to analyze the keratin protein patterns.

Related Experiment Videos

  • Phenotypic data were analyzed for patterns consistent with genetic inheritance.

    • Main Results:

    • All samples expressed 55 kDa, 56.5 kDa, and 65 kDa keratin proteins.
    • Variable expression was observed for 50 kDa (28%), 58 kDa (20%), and 67 kDa (48%) keratin proteins.
    • Identical keratin phenotypes were found in two families, while five families showed variable patterns suggestive of autosomal dominant inheritance.

    Conclusions:

    • Significant inter-individual variations in stratum corneum keratin patterns exist.
    • These variations may be attributed to genetic polymorphism in keratin genes.
    • Post-transcriptional modification, such as proteolytic digestion, could also explain observed keratin differences.