Generation of human embryonic stem-like cells using intronic RNA
First Claim
1. A method for inducing genomic DNA demethylation and hence activating Oct3/4 and Sox2 expression in mammalian cells, comprising the steps of:
- (a) constructing a recombinant SpRNAi-RGFP nucleic acid composition that contains at least an intronic RNA gene silencing effector comprising SEQ. ID. NO. 39, SEQ. ID. NO. 40, SEQ. ID. NO. 41, SEQ. ID. NO. 42, SEQ. ID. NO. 43, SEQ. ID. NO. 44, SEQ. ID. NO. 45 and SEQ. ID. NO. 46, wherein said intronic RNA gene silencing effector is further processed into mir-302a, mir-302b, mir-302c and mir-302d in mammalian cells;
(b) introducing said recombinant SpRNAi-RGFP nucleic acid composition into a plurality of mammalian cells, wherein said plurality of mammalian cells generate a plurality of intronic RNA gene silencing effectors; and
(c) enabling the plurality of intronic RNA gene silencing effectors to reach a level that is sufficient to induce genomic DNA demethylation and hence activate Oct3/4 and Sox2 expression, which consequently results in reprogramming the cells into a pluripotent state.
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Abstract
This invention generally relates to a method for developing, generating and selecting human embryonic stem (hES)-like pluripotent cells using transgenic expression of intronic microRNA-like RNA agents. More particularly, the present invention relates to a method and composition for generating a non-naturally occurring intron and its intronic components capable of being processed into mir-302-like RNA molecules in mammalian cells and thus inducing certain specific gene silencing effects on differentiation-related and fate-determinant genes of the cells, resulting in reprogramming the cells into a pluripotent embryonic stem (ES)-cell-like state. The ES-like cells so obtained are strongly express hES cell markers, such as Oct3/4, SSEA-3 and SSEA-4, and can be guided into various tissue cell types by treating certain hormones and/or growth factors under a feeder-free cell culture condition in vitro, which may be used for transplantation and gene therapies. Therefore, the present invention offers a simple, effective and safe gene manipulation approach for not only reprogramming somatic cells into ES-like pluripotent cells but also facilitating the maintenance of pluripotent and renewal properties of ES cells under a feeder-free cell culture condition, preventing the tedious retroviral insertion of four large transcription factor genes into one single cell as used in the previous iPS methods.
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Citations
32 Claims
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1. A method for inducing genomic DNA demethylation and hence activating Oct3/4 and Sox2 expression in mammalian cells, comprising the steps of:
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(a) constructing a recombinant SpRNAi-RGFP nucleic acid composition that contains at least an intronic RNA gene silencing effector comprising SEQ. ID. NO. 39, SEQ. ID. NO. 40, SEQ. ID. NO. 41, SEQ. ID. NO. 42, SEQ. ID. NO. 43, SEQ. ID. NO. 44, SEQ. ID. NO. 45 and SEQ. ID. NO. 46, wherein said intronic RNA gene silencing effector is further processed into mir-302a, mir-302b, mir-302c and mir-302d in mammalian cells; (b) introducing said recombinant SpRNAi-RGFP nucleic acid composition into a plurality of mammalian cells, wherein said plurality of mammalian cells generate a plurality of intronic RNA gene silencing effectors; and (c) enabling the plurality of intronic RNA gene silencing effectors to reach a level that is sufficient to induce genomic DNA demethylation and hence activate Oct3/4 and Sox2 expression, which consequently results in reprogramming the cells into a pluripotent state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification