Abstract:
:In situ hybridization (ISH) is an essential technique for mapping gene expression in the brain. Although many ISH protocols provide for quantitative analysis of individual mRNAs in different brain regions or across experimental conditions, this technique has lacked the necessary standardization for quantitative comparisons between different mRNA transcripts. We have developed a standardized quantitative ISH (SQuISH) protocol that utilizes multiple radioactive oligonucleotide probes, providing for increased sensitivity, decreased background and accurate comparison of relative mRNA levels. We evaluated the SQuISH protocol against a riboprobe-based ISH procedure by comparing the mRNA expression levels in the brain for two transcripts, insulin receptor substrate p53 (IRSp53) and Calsenilin. The results of these two methods were then validated by real-time quantitative PCR. Both protocols exhibited identical mRNA expression patterns for IRSp53 and Calsenilin. In three brain regions analyzed, the levels of IRSp53 mRNA expression were approximately 1.5-fold higher with the riboprobe-based ISH than with the SQuISH procedure, although the relative abundance in regional expression levels was similar between the two methods. In contrast, the levels of Calsenilin mRNA expression were 10-17-fold higher with the riboprobe-based ISH than with the SQuISH procedure and the relative abundance in regional expression levels was different. When compared to the real-time PCR results, the SQuISH trade mark method showed almost identical relative levels of IRSp53 to Calsenilin mRNA in all three brain regions analyzed, while the riboprobe-based procedure showed a completely opposite trend. These results support the accuracy of the SQuISH protocol for determining relative mRNA levels in the brain.
journal_name
Brain Resjournal_title
Brain researchauthors
Broide RS,Trembleau A,Ellison JA,Cooper J,Lo D,Young WG,Morrison JH,Bloom FEdoi
10.1016/j.brainres.2003.11.069subject
Has Abstractpub_date
2004-03-12 00:00:00pages
211-22issue
1-2eissn
0006-8993issn
1872-6240pii
S0006899304000538journal_volume
1000pub_type
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