Claims for Patent: 4,981,791

Summary for Patent: 4,981,791

Title:	RNA stabilization vector
Abstract:	The present invention provides an RNA stabilization vector including a cloning vehicle, a group I intron inserted into the cloning vehicle and foreign DNA inserted into the intron. The present invention further provides a method for enhancing the production of a gene product by stabilizing the mRNA coding for the gene product using the RNA stabilization vector.
Inventor(s):	Belfort; Marlene (Slingerlands, NY)
Assignee:	Health Research Incorporated (Albany, NY)
Application Number:	07/211,594
Patent Claims:	1. An RNA stabilization vector, which comprises: a cloning vehicle; a group I intron inserted into the cloning vehicle; and foreign DNA inserted into the intron the resulting foreign DNA-intron fusion not being found in nature. 2. An RNA stabilization vector as in claim 1, wherein the cloning vehicle is a bacterial cloning vehicle. 3. An RNA stabilization vector as in claim 2, wherein the bacterial cloning vehicle is a plasmid. 4. An RNA stabilization vector as in claim 1, wherein the group I intron is the td gene of bacteriophage T4. 5. An RNA stabilization vector as in claim 4, wherein the td gene of bacteriophage T4 is modified by deleting a portion of the intron not contributing to group I secondary structure of the intron. 6. An RNA stabilization vector as in claim 1, wherein the intron is located downstream of a promoter for expressing the foreign DNA. 7. An RNA stabilization vector as in claim 1, further comprising a different restriction enzyme insertion site within the intron. 8. An RNA stabilization vector as in claim 3, wherein the plasmid is pUC9. 9. An RNA stabilization vector as in claim 3, wherein the plasmid is pKK223-3. 10. A method for producing a vector for stabilizing mRNA coding for a gene product, which method comprises inserting a foreign gene coding for the gene product into a group I intron in a cloning vehicle the resulting foreign gene-intron fusion not being found in nature. 11. A method for enhancing the production of a gene product, which comprises: inserting a foreign gene into a group I intron in a cloning vehicle the resulting foreign gene-intron fusion not being found in nature; transcribing the intron with inserted foreign gene in a host cell to form a foreign gene-intron RNA fusion; and translating the foreign gene-intron RNA fusion in the host cell to form the gene product of the foreign gene. 12. A method as in claim 11, wherein the cloning vehicle is a bacterial cloning vehicle. 13. A method as in claim 12, wherein the bacterial cloning vehicle is a plasmid. 14. A method as in claim 11, wherein the group I intron is a td gene of bacteriophage T4. 15. A method as in claim 14, wherein the td gene of bacteriophage T4 is modified by deleting a portion of the intron not contributing to group I secondary structure of the intron.

Details for Patent 4,981,791

Applicant	Tradename	Biologic Ingredient	Dosage Form	BLA	Approval Date	Patent No.	Expiredate
Merck Sharp & Dohme Corp.	INTRON A	interferon alfa-2b	For Injection	103132	06/04/1986		2039-02-26
Merck Sharp & Dohme Corp.	INTRON A	interferon alfa-2b	For Injection	103132			2039-02-26
Merck Sharp & Dohme Corp.	INTRON A	interferon alfa-2b	Injection	103132			2039-02-26