1994 Fiscal Year Final Research Report Summary
Trans-splicing occurs after cis-splicing and polyadenylation in processing of Onchocerca volvulus actin mRNA
| Project/Area Number |
05670225
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
寄生虫学(含医用動物学)
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| Research Institution | SHIMANE MEDICAL UNIVERSITY |
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Principal Investigator |
SHIWAKU Kuninori DEPARTMENT OF ENVIRONMENTAL MEDICINE,ASSOCIATE PROFESSOR, 医学部, 助教授 (10108384)
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| Project Period (FY) |
1993 – 1994
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| Keywords | RNA processing / Trans-splicing / Cis-splicing / Polyadenylation / Onchocerca volvulus / Actin / cDNA |
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| Research Abstract |
A novel post-transcriptional process called trans-splicing has been found in trypanosomes and nematodes. In this process an RNA sequence, called the spliced leader (SL) , is spliced into a precursor mRNA to create the 5' segment of the mature mRNA.Since both trans-splicing and cis-splicing occur in nematodes, nematodes is a good model for investigations of mechanism between cis-and trans-splicing. The present investigation was conducted to seek immature mRNAs possessing some introns with or without the SL so that the temporal relationship between cis-and trans-splicing could be examined. cDNA libraries of adult 0.volvulus were screened with two probes, the 5'untranslated region and the coding region region. The two cDNAs clones having coding region, one of five introns, and poly-A tail without SL which were isolated in the present study indicate that polyadenylation can occur before trans-splicing and before cis-splicing is complete. Cis-splicing can also occur before trans-splicing.
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