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Inverted repeats are necessary for circularization of the mouse testis Sry transcript
R A Dubin1, M A Kazmi, H Ostrer
1Department of Pediatrics, New York University Medical Center, NY 10016, USA.
Gene
|December 29, 1995
Summary
Long inverted repeats flanking the mouse Sry gene drive circular RNA formation. This circularization requires intramolecular base pairing and specific splice sites, independent of intermolecular splicing.
Area of Science:
- Molecular Biology
- Genetics
- RNA Biology
Background:
- Circular RNAs (circRNAs) are stable, non-polyadenylated RNA molecules.
- RNA circularization is proposed to involve intramolecular base pairing forming a stem-loop, followed by splicing.
- The human ETS-1 and mouse Sry genes are known to produce circRNAs.
Purpose of the Study:
- To investigate the mechanism of Sry circular transcript formation.
- To determine the role of inverted repeats (IR) in Sry circRNA biogenesis.
- To assess the minimum complementary nucleotide requirement for circularization.
Main Methods:
- Utilizing cultured cells to study Sry gene expression.
- Analyzing the impact of flanking inverted repeats on Sry transcript structure.
- Quantifying the complementary nucleotide length necessary for circularization.
Main Results:
- Long inverted repeats flanking the mouse Sry gene are essential for Sry circRNA formation.
- As few as 400 complementary nucleotides within the IR are sufficient for circularization.
- The presence of IR does not significantly promote intermolecular annealing or trans-splicing.
Conclusions:
- Intramolecular base pairing mediated by flanking inverted repeats is a key driver for Sry circRNA biogenesis.
- Specific splice site recognition within the transient stem-loop structure facilitates circularization.
- The findings elucidate a novel mechanism for circRNA formation involving genomic structural elements.