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Purification of cDNA complementary to sea urchin histone mRNA
Abstract:
Complementary DNA (cDNA) was transcribed from a polyadenylated sea urchin histone mRNA preparation isolated by density gradient centrifugation. By hybridization, this cDNA was shown to be extensively contaminated (85% of hybridizable cDNA) with DNA complementary to RNA derived from the large ribosomal subunit. Purification of a mRNA specific cDNA fraction was achieved by hybridization of purified rRNA to cDNA followed by fractionation on hydroxyapatite. After further purification to remove nonhybridizable cDNA our purified cDNA showed only 8% hybirdization to rRNA.
Insights
Researchers purified sea urchin messenger RNA (mRNA) complementary DNA (cDNA) by removing ribosomal RNA (rRNA) contamination. This method yielded a highly specific cDNA fraction for accurate gene expression studies.
Area of Science:
- Molecular Biology
- Marine Biology
- Biochemistry
Background:
- Messenger RNA (mRNA) is crucial for protein synthesis.
- Complementary DNA (cDNA) is often used to study mRNA.
- Ribosomal RNA (rRNA) can contaminate mRNA preparations.
Purpose of the Study:
- To purify sea urchin histone mRNA-specific cDNA.
- To remove contaminating ribosomal RNA (rRNA) sequences from cDNA.
- To obtain a highly pure cDNA fraction for further research.
Main Methods:
- Transcription of polyadenylated sea urchin histone mRNA into cDNA.
- Density gradient centrifugation for initial mRNA isolation.
- Hybridization techniques using purified rRNA to identify and remove contaminating cDNA.
- Hydroxyapatite fractionation for separating hybridized and non-hybridized DNA fractions.
Main Results:
- Initial cDNA preparation was 85% contaminated with DNA complementary to large ribosomal subunit RNA.
- Purification steps successfully reduced rRNA-related cDNA contamination.
- The final purified cDNA fraction showed only 8% hybridization to rRNA.
Conclusions:
- A robust method was developed to purify sea urchin histone mRNA-specific cDNA.
- This purification strategy effectively removes rRNA-derived contaminants.
- The purified cDNA is suitable for accurate studies of sea urchin histone gene expression.