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A new cancer/testis long noncoding RNA, the OTP-AS1 RNA
Iuliia K Karnaukhova1,2, Dmitrii E Polev2,3, Larisa L Krukovskaya2
1Vavilov Institute of General Genetics, Moscow, Russia.
Scientific Reports
|November 20, 2024
Summary
Researchers identified a novel long noncoding RNA, OTP-AS1, transcribed antisense to the OTP gene. This cancer/testis RNA is highly expressed in tumors and may play a regulatory role alongside the OTP gene.
Area of Science:
- Genetics
- Molecular Biology
- Cancer Research
Background:
- The orthopedia homeobox (OTP) gene is crucial for brain development and mapped to chromosome 5q14.1.
- Previous studies identified OTP gene transcripts in tumors and normal testis, with ESTs suggesting longer, uncharacterized transcripts.
- Antisense transcription and long noncoding RNAs (lncRNAs) are increasingly recognized for their regulatory roles in gene expression.
Purpose of the Study:
- To identify and characterize the full-length transcript of the previously observed antisense transcription within the OTP gene locus.
- To investigate the expression pattern of this novel transcript in various human tumors and normal tissues.
- To determine the potential function and classification of the newly discovered transcript, particularly its relationship with the OTP gene.
Main Methods:
- Rapid Amplification of cDNA Ends (RACE) was employed to obtain the full-length transcript sequence.
- Bioinformatic analysis was used to determine the transcript's structure, including exon-intron boundaries and location relative to the OTP gene.
- Expression analysis was performed across a panel of human tumors and normal tissues.
Main Results:
- A novel 2436-nucleotide polyadenylated antisense transcript, designated OTP-AS1 (OTP-antisense RNA 1), was identified.
- OTP-AS1 comprises two exons, with the first located within OTP's third exon and the second within its second intron.
- OTP-AS1 was highly expressed in numerous human tumors but detected in only one normal testis sample, consistent with cancer/testis (CT) gene expression patterns.
Conclusions:
- The study discovered OTP-AS1, a novel long noncoding RNA (lncRNA) that is antisense to the OTP gene.
- OTP-AS1 exhibits characteristics of a cancer/testis (CT) RNA, with restricted expression in normal tissues but widespread presence in tumors.
- OTP-AS1 and the OTP gene may form a sense-antisense gene pair involved in regulatory interactions, potentially contributing to tumorigenesis.
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