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Overlap of promoter and coding sequences in the mouse STOP gene (Mtap6)
Mustapha Aguezzoul1, Annie Andrieux, Eric Denarier
1Laboratoire du Cytosquelette, INSERM U366, Départment Réponse et Dynamique Cellulaires, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble, Cedex 9, France.
Abstract:
The microtubule-associated proteins STOP are essential for synaptic plasticity and integrated brain function. The STOP gene (Mtap6) is composed of 4 exons and presents different developmental and tissue specific alternative transcripts resulting in the neuronal isoforms E- and N-STOP, and in the fibroblastic F-STOP isoform. We now characterize the transcription initiation sites for neuronal and non neuronal STOP transcripts. Our results show that there is a single neuronal specific promoter for transcription of E- and N-STOP mRNAs. F-STOP mRNA transcription is regulated by a distinct promoter. A remarkable feature of this promoter is that it lies within coding sequences expressed in neuronal E- and N-STOP isoforms.
Insights
Microtubule-associated STOP proteins are crucial for brain function. This study identifies distinct promoters regulating neuronal STOP (E- and N-STOP) and fibroblastic STOP (F-STOP) mRNA transcription, revealing unique regulatory mechanisms.
Area of Science:
- Molecular Biology
- Neuroscience
- Gene Regulation
Background:
- Microtubule-associated proteins (MAPs) called STOPs are vital for synaptic plasticity and brain function.
- The STOP gene (Mtap6) produces neuronal (E- and N-STOP) and fibroblastic (F-STOP) isoforms through alternative splicing.
Purpose of the Study:
- To characterize the transcription initiation sites of neuronal and non-neuronal STOP transcripts.
- To identify and differentiate the promoter regions responsible for STOP gene expression.
Main Methods:
- Analysis of transcription initiation sites.
- Promoter identification and characterization for STOP gene isoforms.
Main Results:
- A single, neuronal-specific promoter drives the transcription of both E-STOP and N-STOP mRNAs.
- A distinct promoter regulates F-STOP mRNA transcription.
- The F-STOP promoter is located within the coding sequences of the neuronal E- and N-STOP isoforms.
Conclusions:
- Neuronal and non-neuronal STOP transcriptions are controlled by separate promoter elements.
- The overlapping regulatory regions highlight complex gene expression control in different cell types.