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Human retinoblastoma susceptibility gene: cloning, identification, and sequence
Science (New York, N.Y.)
|March 13, 1987
Summary
Researchers identified the retinoblastoma susceptibility (RB) gene on chromosome 13q14, crucial for understanding childhood eye cancer. Abnormal RB gene transcription and deletions were observed in retinoblastoma tumors, suggesting its role in cancer development.
Area of Science:
- Genetics
- Molecular Biology
- Oncology
Background:
- Retinoblastoma is a childhood eye cancer.
- A genetic locus on chromosome 13q14 is linked to retinoblastoma susceptibility.
- The esterase D gene is located near this susceptibility locus.
Purpose of the Study:
- To identify and characterize the gene responsible for retinoblastoma susceptibility.
- To investigate the role of this gene in the development of retinoblastoma.
- To analyze the genetic and transcriptional alterations of the retinoblastoma susceptibility gene in tumor samples.
Main Methods:
- Gene identification based on chromosomal location and proximity to esterase D.
- Analysis of messenger RNA (mRNA) expression levels and sizes in tumor and normal tissues.
- DNA deletion analysis (homozygous and hemizygous) in retinoblastoma cells.
- Gene sequencing and protein analysis.
Main Results:
- The retinoblastoma susceptibility (RB) gene, encoding a 4.6 kb mRNA, was identified.
- Abnormal RB mRNA transcription was detected in all six retinoblastoma samples analyzed.
- Tumor samples showed either undetectable RB mRNA or smaller, abnormal mRNA transcripts (approx. 4.0 kb).
- Gene deletions (homozygous or hemizygous) were found in some retinoblastoma DNA samples.
- The RB gene spans over 100 kb and contains at least 12 exons.
- Sequence analysis predicted an 816-amino acid protein with potential nucleic acid-binding domains.
Conclusions:
- The identified RB gene is transcriptionally altered and subject to deletion in retinoblastoma, supporting its role as a tumor suppressor gene.
- These findings provide a basis for understanding the recessive genetic mechanisms underlying retinoblastoma.
- Further research into the RB gene and its protein product is warranted for cancer studies.
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