Identification of molecular sequence signatures and methods involving the same
View Patent ↗Novel means and methods for analyzing hybridization data derived from hybridization assays between a target nucleic acid and differently sequenced polynucleotide probes involve selecting probe sets that define reference sequences for sequence signatures and deriving useful data about the nature of the target nucleic acid molecule based on its hybridization to the probes. The methods are useful for determining whether the target contains a nucleic acid or polypeptide sequence signature, whether the target encodes a member of a gene family, or whether the target is derived from one of any number of genes.
1. A method for analyzing a mRNA, said mRNA comprising one or more exons having an order, said order defined by one or more sequence signatures, each said one or more sequence signatures comprising a sequence spanning two exons, said method comprising;
providing said mRNA;
processing said mRNA to provide labeled nucleic acid fragments corresponding to said exons and said sequence signatures;
hybridizing said labeled fragments to a nucleic acid array, wherein said nucleic acid array comprises probes corresponding to said one or more exons and to said one or more sequence signatures; and
determining the identity of said sequence signatures and order of each said one or more exons to analyze the mRNA.
2. A method according to claim 1 further comprising generating data concerning which probes have bound to which labeled fragments and using computer programs to process said data to determine the identity and order of each said one or more exons.
3. A method according to claim 1 wherein said nucleic acid array is a high density polynucleotide array.
4. A method according to claim 1 , wherein said step of processing is accomplished by in vitro transcription of a reverse transcribed double stranded DNA having a promoter with labeled bases incorporated during the incorporation step.
5. A method according to claim 4 , wherein following said in vitro transcription the labeled RNA is fragmented.
6. A method according to claim 3 wherein said high density oligonucleotide array has a density selected from the group of 625, 1000, 10,000, 1,000,000 and 10,000,000 features per square cm.
7. A method according to claim 1 wherein said sequence signature includes sequences at most 300, 250, 200, 150, 100, 75, 50, 30, 25 or at most 15 nucleotides.
8. A method according to claim 1 wherein said sequence signatures include sequences less than 10, 15, 25, 30, 35, 45, 50, 60, 70, 80, 90, 100, 120, 135, 150, 175, 200, 250 and 300 nucleotides long.
9. A method according to claim 1 wherein said sequence signature includes the Hogness box, the TATA box, a homeobox, the CAAT box and ALU repeat sequences.