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Sequence and structure correlation of human ribosomal transcribed spacers
I L Gonzalez1, C Chambers, J L Gorski
1Hahnemann University, Department of Pathology, Philadelphia, PA 19102.
Journal of Molecular Biology
|March 5, 1990
Summary
Researchers sequenced human ribosomal RNA (rRNA) transcribed spacers, revealing the complete primary transcript. This finding supports the evolutionary origin of variable rRNA regions from transcribed spacers.
Area of Science:
- Molecular Biology
- Genetics
- Bioinformatics
Background:
- Ribosomal RNA (rRNA) is crucial for protein synthesis.
- Understanding rRNA primary transcript structure and evolution is key to deciphering gene regulation.
Purpose of the Study:
- To determine the complete primary transcript sequence of human rRNA.
- To investigate the evolutionary relationship between transcribed spacers and variable rRNA regions.
- To analyze the secondary structure of transcribed spacers and compare it with previous electron microscopy data.
Main Methods:
- Sequencing of transcribed spacers of human rRNA.
- Comparative sequence analysis of transcribed spacers, variable rRNA regions, and non-transcribed spacers.
- Nucleotide sequence-derived secondary structure prediction.
Main Results:
- The complete primary transcript sequence of human rRNA (approx. 13.3 kb) was reconstructed.
- Sequence comparisons support the hypothesis that variable rRNA regions evolved from transcribed spacers.
- Predicted secondary structures of transcribed spacers align with previously observed electron micrograph data.
- Conserved structural elements in mammalian transcribed spacers suggest a role in transcript processing.
Conclusions:
- The complete rRNA primary transcript sequence provides a comprehensive view of rRNA gene expression.
- Transcribed spacers likely played a significant role in the evolution of rRNA.
- The conserved secondary structures of transcribed spacers may be essential for rRNA maturation and function.