Fungal Promoter Sequences for Stable Gene Expression
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Solution Overview
Problem
Current gene expression systems in Pucciniomycotina and Ustilaginomycotina subphyla lack strong, diverse promoters, leading to genome instability and unpredictable expression due to repeated use of identical promoters, which limits their biotechnological applications in producing high-value products like biodiesel and biosurfactants.
Innovation Solution
Development of polynucleotide sequences with the GAGGAG sequence motif as strong promoters for Rhodosporidium, Rhodotorula, Sporobolomyces, and Ustilago genera, which enable efficient gene expression and can be used in DNA constructs with operably linked polypeptide encoding sequences and RNA transcriptional terminators to enhance expression in fungal species.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If identical or highly homologous promoters are repeatedly used for gene expression, then strong gene expression is achieved, but genome instability and epigenetic/genetic modification occur due to RIP or RNA silencing
Solution Approach 1:
The invention segments the promoter pool by identifying and characterizing multiple distinct promoter sequences from different fungal species (Rhodosporidium, Rhodotorula, Sporobolomyces, Ustilago, Pseudozyma). Instead of relying on a single promoter type, the patent divides the available promoter resources into multiple functional segments that can be selectively used, thereby avoiding the repetitive use of identical sequences that triggers RIP and RNA silencing mechanisms.
Solution Approach 2:
The invention changes the parameter of promoter sequence diversity by providing a catalog of promoters with varying sequences, lengths, and origins from different fungal species. This parameter change allows researchers to select promoters with appropriate sequence identity levels to avoid genome instability while maintaining strong expression, directly addressing the contradiction between expression strength and genomic reliability.
2Adaptability or versatility
If an enlarged promoter pool is desired to avoid genome instability, then diversity of promoter sequences is increased, but functionally verified promoters remain scarce
Solution Approach 1:
The invention performs preliminary action by pre-characterizing and validating multiple promoter sequences from different fungal species before they are widely available. The patent has already identified, sequenced, and tested promoters from Rhodosporidium, Rhodotorula, Sporobolomyces, Ustilago, and Pseudozyma genera, providing a ready-to-use catalog of functionally verified promoters that researchers can immediately apply without needing to perform their own extensive validation studies.
Solution Approach 2:
The invention enables self-service by providing a comprehensive promoter catalog with known characteristics and verified functionality that researchers can directly utilize. The patent makes the promoter sequences and their functional data publicly available, allowing scientists to independently select and apply appropriate promoters for their specific needs without requiring extensive additional verification work.
3Adaptability or versatility
If promoters from different organisms are used to enable expression in fungal species, then expression capability is expanded, but activity becomes unpredictable in heterologous hosts
Solution Approach 1:
The invention applies homogeneity by focusing on promoters from closely related fungal species within the same subphyla (Pucciniomycotina and Ustilaginomycotina). This strategic selection creates a more homogeneous group of promoters with similar regulatory mechanisms and sequence features, making their behavior in heterologous fungal hosts more predictable compared to using highly divergent promoters from distantly related organisms.
Data Source
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AI summary
The present invention relates to the application of isolated promoters and synthetic constructs for efficient production of genetically modified cells in a species selected from the Pucciniomycotina and Ustilaginomycotina subphyla, in particular, species selected from the Rhodosporidium, Rhodotourla, Sporobolomyces or Pseudozyma genus.