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Related Experiment Videos

Additive effect of mouse genetic background and mutation of MITF gene on decrease of skin mast cells.

Eiichi Morii1, Keisuke Oboki, Tomoko Jippo

  • 1Department of Pathology, Medical School/Graduate School of Frontier Bioscience, Osaka University, Yamada-oka, Suita, Japan.

Blood
|October 24, 2002
PubMed
Summary

The microphthalmia (mi) transcription factor impacts skin mast cell numbers differently across mouse strains. A factor on chromosome 10, linked to Kit ligand (KitL), compensates for reduced c-kit receptor tyrosine kinase (KIT) expression in WB mice.

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Area of Science:

  • Genetics
  • Immunology
  • Developmental Biology

Background:

  • The microphthalmia (mi) transcription factor is crucial for melanocyte development and influences other cell types.
  • Mast cells are key immune cells involved in allergic reactions and inflammation.
  • Genetic background significantly affects the phenotypic expression of mutations.

Purpose of the Study:

  • To investigate the genetic basis for the differential effect of the mi mutation on skin mast cell numbers in C57BL/6 (B6) versus WB mice.
  • To identify the genetic factor responsible for compensating reduced c-kit receptor tyrosine kinase (KIT) expression in WB-mi/mi mice.

Main Methods:

  • Cross-breeding and linkage analysis in mice.
  • Quantitative analysis of skin mast cell populations.

Related Experiment Videos

  • Assessment of c-kit receptor tyrosine kinase (KIT) expression levels.
  • Analysis of Kit ligand (KitL) mRNA splice variants (KL-1 and KL-2).

    • Main Results:

    • The mi/mi mutation caused a significant decrease in skin mast cells only in the B6 genetic background.
    • Reduced c-kit receptor tyrosine kinase (KIT) expression was observed in B6-mi/mi mice, but not in WB-mi/mi mice.
    • Linkage analysis mapped a compensating factor to chromosome 10, near the KitL locus.
    • WB-mi/mi mice exhibited a higher KL-1/KL-2 mRNA ratio, suggesting increased soluble KitL production.

    Conclusions:

    • A genetic factor on chromosome 10, likely influencing Kit ligand (KitL) expression, compensates for reduced KIT in WB-mi/mi mice.
    • Differential KitL splicing contributes to the observed resistance of mast cells to the mi mutation in the WB background.
    • This study highlights the importance of genetic background in understanding gene function and compensatory mechanisms in development.