Phenol Emulsion-enhanced DNA-driven Subtractive CDNA Cloning: Isolation of Low-abundance Monkey Cortex-specific MRNAs
Overview
Authors
Affiliations
To isolate cDNA clones of low-abundance mRNAs expressed in monkey cerebral cortex but absent from cerebellum, we developed an improved subtractive cDNA cloning procedure that requires only modest quantities of mRNA. Plasmid DNA from a monkey cerebellum cDNA library was hybridized in large excess to radiolabeled monkey cortex cDNA in a phenol emulsion-enhanced reaction. The unhybridized cortex cDNA was isolated by chromatography on hydroxyapatite and used to probe colonies from a monkey cortex cDNA library. Of 60,000 colonies screened, 163 clones were isolated and confirmed by colony hybridization or RNA blotting to represent mRNAs, ranging from 0.001% to 0.1% abundance, specific to or highly enriched in cerebral cortex relative to cerebellum. Clones of one medium-abundance mRNA were recovered almost quantitatively. Two of the lower-abundance mRNAs were expressed at levels reduced by a factor of 10 in Alzheimer disease relative to normal human cortex. One of these was identified as the monkey preprosomatostatin I mRNA.
An integrated technique for identification of differential genes expressed in patients with cancer.
Li S, Liu S, Lei X J Huazhong Univ Sci Technolog Med Sci. 2005; 24(6):578-80.
PMID: 15791846 DOI: 10.1007/BF02911360.
Expression profiling to understand actions of NMDA/glutamate receptor antagonists in rat brain.
Toronen P, Storvik M, Linden A, Kontkane O, Marvanova M, Lakso M Neurochem Res. 2002; 27(10):1209-20.
PMID: 12462419 DOI: 10.1023/a:1020985611667.
A simulation of subtractive hybridization.
Cho T, Park S Nucleic Acids Res. 1998; 26(6):1440-8.
PMID: 9490790 PMC: 147417. DOI: 10.1093/nar/26.6.1440.
Gerard G, Fox D, Nathan M, DAlessio J Mol Biotechnol. 1997; 8(1):61-77.
PMID: 9327398 DOI: 10.1007/BF02762340.
Embryonic neuronal markers in tuberous sclerosis: single-cell molecular pathology.
Crino P, Trojanowski J, Dichter M, Eberwine J Proc Natl Acad Sci U S A. 1996; 93(24):14152-7.
PMID: 8943076 PMC: 19509. DOI: 10.1073/pnas.93.24.14152.