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[Normal development of human fetal skin].

V Nazzaro

    Giornale Italiano Di Dermatologia E Venereologia : Organo Ufficiale, Societa Italiana Di Dermatologia E Sifilografia
    |October 1, 1989
    PubMed
    Summary

    Fetal skin biopsies are crucial for diagnosing inherited skin diseases. By 18 weeks gestation, key structural and antigenic markers are developed, enabling accurate prenatal diagnosis.

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    Pediatric dermatology·1990

    Area of Science:

    • Dermatology
    • Developmental Biology
    • Genetics

    Context:

    • Prenatal diagnosis of severe inherited skin diseases relies on understanding fetal skin development.
    • Fetal skin biopsies are typically performed around 18 weeks of gestation.

    Purpose:

    • To detail the structural and antigenic development of human fetal skin relevant to prenatal diagnosis.
    • To identify key markers and structures present by 18 weeks gestation for diagnostic utility.

    Summary:

    • Epidermal structure and antigenicity develop within the first 10 weeks of gestation.
    • By 18 weeks gestation, the dermal-epidermal junction is fully formed with hemidesmosomes and anchoring fibrils.
    • Type IV collagen, laminin, and specific markers (GB3, LH 7:2) are detectable for diagnostic mapping.
    • Pilosebaceous units and follicular keratinization are present by 18 weeks; interfollicular keratinization and sweat glands appear later (24-27 weeks).

    Impact:

    • Establishes the critical developmental window for effective prenatal diagnosis of fetal skin conditions.
    • Provides a foundational understanding of fetal skin maturation for diagnostic and research purposes.
    • Highlights the utility of specific molecular and structural markers in early prenatal genetic testing.

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