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Different sites of polyadenylation in mRNAs encoding a rat metabotropic glutamate receptor
P J O'Hara1, T L Gilbert, B A Haldeman
1ZymoGenetics, Inc., Seattle, WA 98105.
Abstract:
Two new complementary DNAs overlapping cDNA clones that encode the G-protein coupled metabotropic glutamate receptor mGluR1 from rat brain have been isolated and sequenced in their entirety. These new clones represent mRNA with 3' untranslated regions approximately 2.5 kilobases longer than the previously isolated cDNA clones. These results indicate that the previously observed two size classes of approximately 4 kb and approximately 7 kb which hybridize to sequences that encode this receptor use different polyadenylation signals and differ in the extent of their 3' untranslated sequence. There is a striking asymmetry in the distribution of a sequence involved in mRNA instability between the two mRNA species.
Insights
Researchers identified new complementary DNAs for the metabotropic glutamate receptor 1 (mGluR1) in rat brains. These findings reveal distinct mRNA structures and polyadenylation signals, impacting receptor expression.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- The metabotropic glutamate receptor 1 (mGluR1) plays a crucial role in neuronal signaling.
- Previous studies identified two size classes of mGluR1 mRNA (approx. 4 kb and 7 kb).
Purpose of the Study:
- To isolate and fully sequence complementary DNAs (cDNAs) encoding rat brain mGluR1.
- To elucidate the structural differences between the two observed mRNA size classes.
Main Methods:
- Isolation and complete sequencing of overlapping cDNA clones for mGluR1.
- Analysis of 3' untranslated regions (UTRs) and polyadenylation signals.
Main Results:
- Two new cDNA clones encoding mGluR1 were fully sequenced.
- These clones revealed longer 3' UTRs (approx. 2.5 kb longer) compared to previously isolated clones.
- The two mRNA size classes utilize different polyadenylation signals and exhibit varying 3' UTR lengths.
Conclusions:
- The distinct 3' UTRs and polyadenylation signals contribute to the observed size heterogeneity of mGluR1 mRNA.
- Asymmetrical distribution of an mRNA instability sequence was noted between the two mRNA species.