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Murine A-myb: evidence for differential splicing and tissue-specific expression
1Fels Institute for Cancer Research and Molecular Biology, Temple University School of Medicine, Philadelphia, PA 19140.
Oncogene
|October 1, 1994
Summary
The A-myb gene is crucial for mouse spermatogenesis, regulating stem cell proliferation and differentiation. Its expression pattern suggests a key role in male germ cell development.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- The myb gene family includes A-myb, B-myb, and c-myb, encoding transcription factors.
- These proteins bind DNA sequence-specifically to regulate gene transcription.
- Understanding A-myb's function is vital for comprehending gene regulation in development.
Purpose of the Study:
- To report the nucleotide sequence of murine A-myb cDNA.
- To investigate the expression pattern of A-myb in adult mouse tissues.
- To elucidate the role of A-myb in spermatogenesis.
Main Methods:
- cDNA sequencing of murine A-myb.
- Northern blot analysis of adult mouse tissue RNAs.
- In situ hybridization of adult mouse testis.
Main Results:
- Murine A-myb cDNA encodes a 751-amino acid protein (83 kDa).
- Alternative splicing generates smaller A-myb protein variants.
- A-myb is predominantly expressed in the testis, with lower levels in ovaries, spleen, and brain.
- High A-myb expression observed in spermatogonia and early spermatocytes, decreasing with differentiation.
Conclusions:
- A-myb plays a significant role in controlling spermatogonial proliferation and differentiation.
- The expression pattern of A-myb in the testis suggests its involvement in spermatogenesis.
- A-myb's function in spermatogenesis parallels c-myb's role in hematopoiesis.