Nannochloropsis Spliced Leader Sequences Enhance Recombinant Protein Expression
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Solution Overview
Problem
Obtaining high expression of recombinant proteins in biotechnology is challenging, particularly due to difficulties in identifying and isolating species-specific full-length cDNAs from microalgal species like Nannochloropsis, which face contamination issues with rRNA, mitochondrial or chloroplast RNA transcripts, and genomic DNA, especially in mixed cell cultures.
Innovation Solution
The use of spliced leader (SL) sequences from Nannochloropsis, which are operably linked to heterologous nucleic acid sequences, to enhance gene expression and facilitate the identification and isolation of specific mRNAs through nucleic acid constructs and methods that include SL-homologous sequences with high sequence identity, allowing for the creation of recombinant nucleic acid molecules and expression cassettes that improve protein production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to isolate mRNAs from microalgal species, then full-length cDNAs can be obtained, but the process is contaminated with rRNA, mitochondrial or chloroplast RNA transcripts, and genomic DNA
Solution Approach 1:
The patent introduces spliced leader (SL) sequence-specific primers as intermediaries to selectively amplify only nuclear-encoded mRNAs. These SL primers act as mediators that specifically recognize and bind to the spliced leader sequences present at the 5' end of mature mRNAs in heterokonts, thereby excluding rRNA, mitochondrial RNA, chloroplast RNA, and genomic DNA from amplification. This intermediary approach enables specific isolation of target mRNAs without contamination from other RNA and DNA molecules.
2Productivity
If SL sequences are used to enhance gene expression, then recombinant protein production is improved, but the complexity of nucleic acid construct design increases
Solution Approach 1:
The patent applies preliminary action by pre-characterizing and identifying the conserved spliced leader sequence motifs specific to Nannochloropsis and other heterokont species before constructing expression vectors. The SL sequences have been预先 identified and validated for their ability to enhance gene expression in heterokonts. This preliminary characterization allows researchers to directly incorporate these known functional SL sequences into expression constructs without needing to perform de novo sequence analysis, thereby reducing the overall complexity of the construct design process while maintaining high recombinant protein production.
Data Source
AI summary
The present invention relates to the culture and manipulation of microorganisms for biotech applications, and is based on the discovery and characterization of spliced leader sequences identified in transcripts from Nannochloropsis species. In particular, the invention provides nucleic acid compositions comprising a SL sequence operably linked to a protein-encoding gene. Further provided are compositions and methods for enhanced gene expression in recombinant microorganisms as well as methods for identification and/or isolation of nucleic acid molecules tagged with a spliced leader sequence.