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Uncovering hidden complexity in the Apis mellifera mitotranscriptome: a polyadenylation-centered perspective
Merve Nur Aydemir1, Habeş Bilal Aydemir2, Ertan Mahir Korkmaz3
1Department of Genomics, Department of Aquatic Biotechnology and Genomics, Faculty of Aquatic Sciences, Istanbul University, Istanbul, Türkiye.
Mitochondrion
|July 22, 2026
Summary
Mitochondrial DNA (mtDNA) transcription in Apis mellifera reveals complex RNA processing. Both sense and antisense transcripts are polyadenylated, with variations in tail length and isoforms, suggesting novel regulatory elements.
Area of Science:
- Molecular Biology
- Genomics
- Insect Biology
Background:
- Mitochondrial DNA (mtDNA) transcription is crucial for cellular energy production.
- Emerging evidence suggests mtDNA encodes more than just oxidative phosphorylation genes.
- Understanding the mitochondrial transcriptome is key to deciphering its full coding potential.
Purpose of the Study:
- To investigate the mitochondrial transcriptome of Apis mellifera.
- To focus on polyadenylation-associated features in mitochondrial transcripts.
- To explore the complexity of mitochondrial RNA processing and regulation.
Main Methods:
- Bioinformatic analysis of the Apis mellifera mitochondrial transcriptome.
- Identification and characterization of polyadenylation sites and transcript isoforms.
- Experimental validation using RT-qPCR and 3' RACE-PCR.
Main Results:
- Both sense and antisense mitochondrial transcripts undergo polyadenylation.
- Significant variation in transcript abundance and poly(A) tail lengths observed across genes.
- Alternative transcript isoforms, including intergenic regions and non-templated additions, were identified.
- Monocistronic units containing downstream intergenic regions were abundant.
Conclusions:
- The Apis mellifera mitochondrial transcriptome exhibits a higher complexity than previously recognized.
- Polyadenylation dynamics play a significant role in shaping mitochondrial RNA diversity.
- Intergenic regions and non-templated nucleotide additions may have regulatory functions in mitochondrial gene expression.
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