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Cloning, sequence, and developmental expression analysis of C4-2, a potential brain tumor-suppressor gene
1Deke Slayton Center for Brain Cancer Studies, Northwest Hospital, Seattle, Washington, USA. ASEHGAL@NWHSEA.ORG
Background:
Previously, we reported the isolation of C4-2 as a potential tumor suppressor gene in human brain tumors. To understand the function of this gene, we investigated its molecular characterization and expression during development.
Methods:
Human fetal brain library screening and 5'RACE-PCR method was used to isolate the full-length cDNA. The coding region of C4-2 was used for in situ hybridization to study its expression during development.
Results:
We report here the complete sequence of this gene. Sequence analysis indicated that C4-2 has a 94% sequence identity to a family of cAMP-regulated phosphoproteins (ARPP-16/19) in the coding region. C4-2 has a 3.1 Kb long 3'UTR with variable identity to ARPP-16 and ARPP-19. Northern blot analysis indicated that C4-2 is expressed at high levels in normal brain compared to other tissues. Zoo blot analysis demonstrated that the coding region of C4-2 is highly conserved among different animals. In situ hybridization using C4-2 coding region demonstrated that it follows a unique expression pattern during mouse brain development. High level of C4-2 expression was also observed in the spinal cord and somites of the developing embryo.
Conclusion:
Expression analysis during brain development strongly suggests that this family of proteins may play an important role not only in normal functioning of the brain, but also during brain development.
Insights
The C4-2 gene, related to cAMP-regulated phosphoproteins, shows high expression in normal brain tissue and conserved coding regions across species. Its unique developmental expression pattern suggests a key role in brain function and development.
Area of Science:
- Neuroscience
- Molecular Biology
- Developmental Biology
Background:
- C4-2 was previously identified as a potential tumor suppressor gene in human brain tumors.
- Understanding the molecular function and developmental expression of C4-2 is crucial.
Purpose of the Study:
- To perform molecular characterization of the C4-2 gene.
- To investigate the expression pattern of C4-2 during development.
Main Methods:
- Isolation of full-length cDNA using human fetal brain library screening and 5'RACE-PCR.
- In situ hybridization of the C4-2 coding region to study developmental expression patterns.
Main Results:
- Complete sequence of C4-2 determined, showing 94% coding region identity to cAMP-regulated phosphoproteins (ARPP-16/19).
- C4-2 exhibits high expression in normal brain tissue compared to other tissues.
- Unique expression patterns observed during mouse brain development, with high levels in the spinal cord and somites.
Conclusions:
- The C4-2 gene family is highly conserved across animal species.
- Expression analysis indicates a significant role for C4-2 in normal brain function.
- The study suggests the C4-2 protein family plays a vital role during brain development.