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Cytokeratins 8 and 19 in the mouse placental development
Y Tamai1, T Ishikawa, M R Bösl
1Banyu Tsukuba Research Institute (Merck), Tsukuba, Ibaraki 300-2611, Japan.
The Journal of Cell Biology
|November 4, 2000
Summary
Cytokeratin 19 (K19) plays a vital role in placental development. Compound K19 and K8 mutants exhibit placental defects, leading to embryonic lethality, highlighting their cooperative function.
Area of Science:
- Developmental Biology
- Cell Biology
- Genetics
Background:
- Cytokeratin 19 (K19) is an intermediate filament protein found in epithelial cells.
- Its precise roles in development and tissue function are not fully understood.
Purpose of the Study:
- To investigate the expression patterns and biological functions of K19 during mouse development.
- To explore the functional cooperation between K19 and Cytokeratin 8 (K8).
Main Methods:
- Generation of K19-deficient mice using gene knockout technology (homologous recombination).
- Creation of compound K19/K8 homozygous mutant mice.
- Analysis of embryonic development and placental morphology.
Main Results:
- K19-deficient mice were viable and fertile, with K19 expression observed in adult epithelial tissues.
- Compound K19/K8 mutant embryos exhibited embryonic lethality around 10 days post coitum.
- Placental defects in compound mutants included excessive giant trophoblasts and impaired labyrinthine/spongiotrophoblast development.
Conclusions:
- K19 is essential for normal embryonic development, particularly for placental formation.
- K19 and K8 functionally cooperate to ensure proper placental development and prevent embryonic lethality.