Nucleic acid analysis techniques
First Claim
1. A method of identifying differences in nucleic acid levels between two or more nucleic acid samples, each sample comprising a population of mRNA or nucleic acids derived therefrom;
- said method comprising the steps of;
(a) providing one or more nucleic acid probe arrays each comprising probes not chosen to hybridize to nucleic acids derived from particular preselected genes or mRNAs;
(b) hybridizing said nucleic acid samples to said one or more arrays to form hybrid duplexes between nucleic acids in said nucleic acid samples and probes in said one or more arrays that are complementary to said nucleic acids or subsequences thereof; and
(c) determining a first value for a difference in hybridization between two probes differing from each other in at least one position to a first sample, and a second value for a difference in hybridization between the two probes to a second sample, a difference in hybridization values between said nucleic acid samples indicating a difference in a level of a nucleic acid between the first and second samples.
6 Assignments
0 Petitions
Accused Products
Abstract
The present invention provides a simplified method for identifying differences in nucleic acid abundances (e.g., expression levels) between two or more samples. The methods involve providing an array containing a large number (e.g. greater than 1,000) of arbitrarily selected different oligonucleotide probes where the sequence and location of each different probe is known. Nucleic acid samples (e.g. mRNA) from two or more samples are hybridized to the probe arrays and the pattern of hybridization is detected. Differences in the hybridization patterns between the samples indicates differences in expression of various genes between those samples. This invention also provides a method of end-labeling a nucleic acid. In one embodiment, the method involves providing a nucleic acid, providing a labeled oligonucleotide and then enzymatically ligating the oligonucleotide to the nucleic acid. Thus, for example, where the nucleic acid is an RNA, a labeled oligoribonucleotide can be ligated using an RNA ligase. In another embodiment, the end labeling can be accomplished by providing a nucleic acid, providing labeled nucleoside triphosphates, and attaching the nucleoside triphosphates to the nucleic acid using a terminal transferase.
591 Citations
28 Claims
-
1. A method of identifying differences in nucleic acid levels between two or more nucleic acid samples, each sample comprising a population of mRNA or nucleic acids derived therefrom;
- said method comprising the steps of;
(a) providing one or more nucleic acid probe arrays each comprising probes not chosen to hybridize to nucleic acids derived from particular preselected genes or mRNAs;
(b) hybridizing said nucleic acid samples to said one or more arrays to form hybrid duplexes between nucleic acids in said nucleic acid samples and probes in said one or more arrays that are complementary to said nucleic acids or subsequences thereof; and
(c) determining a first value for a difference in hybridization between two probes differing from each other in at least one position to a first sample, and a second value for a difference in hybridization between the two probes to a second sample, a difference in hybridization values between said nucleic acid samples indicating a difference in a level of a nucleic acid between the first and second samples. - View Dependent Claims (3, 4, 6, 7, 8, 17, 18, 19, 20, 21)
- said method comprising the steps of;
-
2. A method of identifying differences in nucleic acid levels between two or more nucleic acid samples, each sample comprising a population of mRNA or nucleic acids derived therefrom;
- said method comprising the steps of;
(a) providing one or more oligonucleotide arrays each comprising probe oligonucleotides wherein said probe oligonucleotides comprise a nucleotide sequence selected according to a process selected from the group consisting of a random selection, a haphazard selection, and a nucleotide composition biased selection;
(b) hybridizing said nucleic acid samples to said one or more arrays to form hybrid duplexes between nucleic acids in said nucleic acid samples and probe oligonucleotides in said one or more arrays that are complementary to said nucleic acids or subsequences thereof; and
(c) determining differences in hybridization between said nucleic acid samples wherein said differences in hybridization indicate differences in said nucleic acid levels. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
- said method comprising the steps of;
-
5. A method of identifying differences in nucleic acid levels between two or more nucleic acid samples each comprising a population of nucleic acids, said method comprising the steps of:
-
(a) providing one or more nucleic acid probe arrays each comprising probes comprising a nucleotide sequence selected according to a process selected from the group consisting of a random selection, a haphazard selection, and a nucleotide composition biased selection;
(b) providing software describing the location and sequence of probes on said array;
(c) hybridizing said nucleic acid samples to said one or more arrays to form hybrid duplexes between nucleic acids in said nucleic acid samples and probes in said one or more arrays that are complementary to said nucleic acids or subsequences thereof;
(d) operating said software such that said hybridizing indicates differences in said nucleic acid levels.
-
-
22. A method of analyzing a nucleic acid population comprising:
-
converting the nucleic acid population into nucleic acid fragments;
ligating the nucleic acid fragments to a labelled nucleic acid molecule to form labelled nucleic acid fragments;
hybridizing the labelled nucleic acid fragments to an array of nucleic acid probes, and determining hybridizations signals of the probes as an indication of levels of the nucleic acids in the nucleic acid population. - View Dependent Claims (23, 24)
-
-
25. A method of analyzing a nucleic acid population, comprising:
-
hybridizing a population of nucleic acids targets to an array of nucleic acid probes, whereby one or more of the nucleic acids hybridizes to probes in the array;
contacting the array with a labelled nucleotide and terminal deoxytransferase, whereby the labelled nucleotide is added to hybridized target molecules;
detecting label hybridized to probes as an indication of which nucleic acids are present in the nucleic acid population. - View Dependent Claims (26)
-
-
27. A method of analyzing a nucleic acid population, comprising:
-
hybridizing a population of nucleic acid targets to an array of nucleic acid probes, whereby a plurality of nucleic acid targets hybridize to complementary probes in the array;
forming a common tail on the hybridized nucleic acid targets or their complementary probes;
contacting the array with a labelled moiety having specific affinity for the tail, whereby the moiety binds to the tails;
detecting label hybridized to probes as an indication of the levels of the nucleic acids in the nucleic acid population. - View Dependent Claims (28)
-
Specification