Related Experiment Videos
cDNA sequence analysis of the human brain insulin receptor
K A Kenner1, J Kusari, K A Heidenreich
1Department of Medicine, University of California, San Diego, La Jolla 92093, USA.
Biochemical and Biophysical Research Communications
|December 5, 1995
Summary
The human brain insulin receptor (IR) mRNA, amplified via polymerase chain reaction (PCR), showed only the A isoform. Differences in brain IR glycosylation are due to post-translational processing, not primary structure.
Area of Science:
- Molecular Biology
- Neuroscience
- Endocrinology
Background:
- The insulin receptor (IR) plays crucial roles in brain function, including glucose metabolism and neuronal signaling.
- Previous studies suggested potential structural differences in brain insulin receptors compared to peripheral tissues.
Purpose of the Study:
- To investigate the primary structure of the human brain insulin receptor (IR) mRNA.
- To determine if observed differences in glycosylation of brain IRs are due to variations in the amino acid sequence.
Main Methods:
- Polymerase chain reaction (PCR) amplification of brain tissue mRNA using primers for the human placental insulin receptor.
- Sequencing of amplified cDNA to analyze the coding sequence and identify isoforms.
- Comparison of brain-derived IR cDNA sequence with that from human placenta.
Main Results:
- Only the A isoform (lacking exon 11) of the insulin receptor was detected in human brain mRNA.
- No differences were found in the predicted amino acid sequence between brain and placental insulin receptor cDNA.
- A silent polymorphism confirmed sequencing of mRNA from both alleles of the human brain receptor.
Conclusions:
- The unique glycosylation properties of brain insulin receptors are not attributed to differences in primary amino acid structure.
- Tissue-specific differences in post-translational processing likely account for the distinct glycosylation patterns observed in brain insulin receptors.