Selective oxidation of 5-methylcytosine by TET-family proteins
First Claim
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1. A method comprising:
- regulating a methylation status of one or more cytosine bases in an adult cell that is isolated and purified, wherein the regulating comprises contacting the adult cell with an effective amount of;
(i) an enzyme or fragment thereof that converts;
(a) 5-methylcytosine to 5-hydroxymethylcytosine,(b) 5-methylcytosine to an acid beyond hydroxymethlyation, or(c) 5-methylcytosine to an aldehyde beyond hydroxymethlyation;
(ii) an inhibitor that decreases or prevents hydroxymethylation, wherein the inhibitor comprises siRNA or shRNA;
or(iii) a combination thereof, andwherein the methylation status of the one or more cytosine bases in the adult cell is regulated.
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Abstract
The present invention provides for novel methods for regulating and detecting the cytosine methylation status of DNA. The invention is based upon identification of a novel and surprising catalytic activity for the family of TET proteins, namely TET1, TET2, TET3, and CXXC4. The novel activity is related to the enzymes being capable of converting the cytosine nucleotide 5-methylcytosine into 5-hydroxymethylcytosine by hydroxylation.
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Citations
17 Claims
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1. A method comprising:
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regulating a methylation status of one or more cytosine bases in an adult cell that is isolated and purified, wherein the regulating comprises contacting the adult cell with an effective amount of; (i) an enzyme or fragment thereof that converts; (a) 5-methylcytosine to 5-hydroxymethylcytosine, (b) 5-methylcytosine to an acid beyond hydroxymethlyation, or (c) 5-methylcytosine to an aldehyde beyond hydroxymethlyation; (ii) an inhibitor that decreases or prevents hydroxymethylation, wherein the inhibitor comprises siRNA or shRNA;
or(iii) a combination thereof, and wherein the methylation status of the one or more cytosine bases in the adult cell is regulated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification