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Primate brain-specific cytoplasmic transcript of the Alu repeat family
1Department of Molecular Biology, Research Institute of Scripps Clinic, La Jolla, California 92037.
Molecular and Cellular Biology
|September 1, 1987
Summary
Repetitive DNA sequences, specifically Alu elements, are expressed in the brain of humans, monkeys, and rats. This brain-specific transcription of repetitive DNA is a conserved process across mammalian brains.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Repetitive DNA sequences, such as Alu elements, constitute a significant portion of mammalian genomes.
- The function and expression patterns of these repetitive elements, particularly in the brain, remain incompletely understood.
Purpose of the Study:
- To investigate the expression patterns of specific repetitive DNA sequences in mammalian brain tissue.
- To determine if the observed expression is conserved across different mammalian species.
Main Methods:
- RNA expression analysis was performed on brain and non-neural tissues from monkeys and humans.
- Cell lines were also utilized to study the expression of a 200-nucleotide RNA homologous to the left monomer of Alu elements.
- Similar analyses were conducted on rat brain tissue to assess cross-species conservation.
Main Results:
- A 200-nucleotide RNA, homologous to the left Alu monomer, was detected in monkey and human brain tissue and in cell lines.
- This specific RNA transcript was notably absent in non-neural monkey tissues.
- Brain-specific transcription of identifier sequences was also observed in rats, indicating a conserved pattern.
Conclusions:
- The expression of selected repetitive DNA families, including Alu elements, is a conserved process in the mammalian brain.
- This finding suggests a potential functional role for these repetitive elements in neural tissue across species.