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Published on: November 5, 2014
The murine pallid mutation is a platelet storage pool disease associated with the protein 4.2 (pallidin) gene
R A White1, L L Peters, L R Adkison
1Division of Hematology/Oncology, Children's Hospital, Boston, Massachusetts.
Abstract:
Pallid is one of 12 independent murine mutations with a prolonged bleeding time that are models for human platelet storage pool deficiencies in which several intracellular organelles are abnormal. We have mapped the murine gene for protein 4.2 (Epb4.2) to chromosome 2 where it co-localizes with pallid. Southern blot analyses suggest that pallid is a mutation in the Epb4.2 gene. Northern blot analyses demonstrate a smaller than normal Epb4.2 transcript in affected pallid tissues, such as kidney and skin. This is the first gene defect to be associated with a platelet storage pool deficiency, and may allow the identification of a novel structure or biological pathway that influences granulogenesis.
Insights
The pallid mouse mutation, a model for human platelet disorders, is caused by a defect in the protein 4.2 gene (Epb4.2). This discovery identifies the first gene linked to platelet storage pool deficiency, potentially revealing new pathways in cell development.
Area of Science:
- Genetics and Molecular Biology
- Hematology
- Cell Biology
Background:
- Platelet storage pool deficiencies are characterized by prolonged bleeding times and abnormal intracellular organelles.
- The murine pallid mutation is a known model exhibiting these characteristics, suggesting a genetic basis for platelet dysfunction.
Purpose of the Study:
- To identify the specific gene responsible for the pallid mutation.
- To investigate the molecular basis of the platelet storage pool deficiency observed in pallid mice.
Main Methods:
- Gene mapping of the murine protein 4.2 (Epb4.2) gene to chromosome 2.
- Co-localization analysis of the Epb4.2 gene with the pallid mutation locus.
- Southern and Northern blot analyses to assess gene structure and transcript levels in pallid tissues.
Main Results:
- The Epb4.2 gene was mapped to chromosome 2, co-localizing with the pallid mutation.
- Southern blot analysis indicated that pallid represents a mutation within the Epb4.2 gene.
- Northern blot analysis revealed a reduced-size Epb4.2 transcript in pallid kidney and skin tissues.
Conclusions:
- The pallid mutation is a genetic defect in the Epb4.2 gene.
- This finding represents the first identified gene defect associated with platelet storage pool deficiency.
- The study opens avenues for exploring novel cellular structures and biological pathways involved in granulogenesis.
