Transcriptional regulation of gene expression by small double-stranded modulatory RNA
The invention provides a method for modulating gene expression by contacting a cellular system with a double-stranded ribonucleic acid molecule capable of associating with a regulatory machinery that controls transcription of one or more genes, wherein the association results in altered expression of the one or more genes. The invention is further directed to method for directing the differentiation of neuronal stem cells into neurons by contacting a cellular system with a double-stranded ribonucleic acid molecule capable of associating with a regulatory machinery that controls transcription of one or more genes involved in neuronal differentiation and directing the transcription of the one or more genes. In related embodiments, the invention provides particular compositions of double-stranded ribonucleic acid molecules as well as therapeutic and screening applications of the invention.
1. A method for increasing transcription comprising:
contacting in vitro a cellular system comprising a regulatory machinery that controls transcription of one or more genes with a small modulatory double-stranded ribonucleic acid (smRNA) molecule, wherein:
(i) the regulatory machinery comprises a nucleic acid regulatory element located in a promoter region;
(ii) said one or more genes are specific to expression in the nervous system;
(iii) said nucleic acid regulatory element comprises a neuron-restrictive silencer element/repressor element 1 (NRSE/RE1); and
(iv) the nucleic acid sequence of said smRNA molecule consists of SEQ ID NO:1 and a complementary sequence of SEQ ID NO:1.
2. The method of claim 1 , wherein said regulatory machinery further comprises a trans-acting regulatory protein.
3. The method of claim 1 , wherein said one or more genes have a pleiotropic effect.
4. The method of claim 1 , wherein a vector is utilized to deliver said smRNA molecule to said cellular system.
5. The method of claim 4 , wherein said vector is a viral vector.
6. The method of claim 5 , wherein said viral vector is derived from a lentivirus.
7. The method of claim 1 , wherein said one or more genes is selected from the group consisting of synapsin I, sodium channel type II, brain derived neurotrophic factor, Ng-CAM and L1.
8. The method of claim 1 , wherein said one or more genes are involved in differentiation of neuronal stem cells into neurons.
9. A method for directing the differentiation of neuronal stem cells into neurons by increasing transcription of one or more genes involved in differentiation of neuronal stem cells, comprising contacting in vitro a neuronal stem cell comprising a regulatory machinery that controls transcription of one or more genes involved in neuronal differentiation with a small modulatory double-stranded ribonucleic acid (smRNA) molecule, wherein: (i) the regulatory machinery comprises a nucleic acid regulatory element located in a promoter region;
(ii) said one or more genes are specific to expression in the nervous system;
(iii) said nucleic acid regulatory element comprises a neuron-restrictive silencer element/repressor element 1 (NRSE/RE1); and
(iv) the nucleic acid sequence of said smRNA molecule consists of SEQ ID NO: 1 and a complementary sequence of SEQ ID NO:1.
10. The method of claim 1 , wherein the transcription is measured by a reporter assay.
11. The method of claim 1 , wherein the transcription is measured by RT-PCR.
12. The method of claim 4 , wherein the transcription is measured by a reporter assay.
13. The method of claim 4 , wherein the transcription is measured by RT-PCR.