Komagataella pastoris Centromere Vector Stability
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Solution Overview
Problem
The development of stable autonomous replication vectors for eukaryotes like yeast is challenging due to the absence of centromere DNA sequences, leading to instability and incorrect genome integration during genetic engineering, particularly in Komagataella pastoris where no centromere DNA sequence has been identified, affecting the precision and stability of genetic modifications.
Innovation Solution
Identification and utilization of a 125 bp DNA sequence specific to the centromere of Komagataella pastoris chromosomes, which is incorporated into vectors to enhance stability and maintainance within host cells, allowing for stable genomic integration and autonomous replication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If autonomous replication vectors are constructed in eukaryotes such as yeast, then replication capability is achieved, but stability deteriorates due to absence of centromere DNA sequence
Solution Approach 1:
The invention extracts the essential centromere DNA sequence (CEN6, 125 bp) from the complex yeast genome and incorporates it into the autonomous replication vector. This extraction of the critical stabilizing element resolves the contradiction by providing stability without requiring the entire complex centromere region, thus maintaining constructability while achieving stability.
Solution Approach 2:
The centromere DNA sequence is incorporated into the vector design in advance, before transformation into yeast cells. This preliminary inclusion of the stabilizing element ensures that the vector maintains stability during subsequent replication and propagation, preventing the instability that would otherwise occur in eukaryotic systems.
2Manufacturing precision
If genomic integration is performed for genetic engineering, then genetic modification is achieved, but unexpected genome structure changes occur
Solution Approach 1:
The centromere DNA sequence acts as an intermediary element that enables controlled integration of foreign DNA into the yeast genome. By providing a specific integration target site with known sequence and structure, it mediates the integration process to achieve precision while minimizing random insertion events that could cause harmful genome disruptions.
Solution Approach 2:
The invention changes the integration parameter from random genomic insertion to targeted integration at the centromere locus. By specifying the integration site through the centromere DNA sequence, the process achieves higher precision while reducing the harmful effects of random genome structure changes.
3Adaptability or versatility
If centromere DNA sequence from different host is used, then versatility is improved, but stability deteriorates due to protein difference in chromosome segregation
Solution Approach 1:
The invention applies local quality by using the host-specific centromere DNA sequence (CEN6 from Komagataella pastoris) at the critical centromere locus while allowing other parts of the vector to maintain universal features. This ensures that the essential chromosome segregation function is optimized for the specific host, maintaining reliability, while the overall vector system retains versatility through modular design.
Data Source
AI summary
A vector is provided that includes a nucleotide sequence selected from any one of (a) to (d). The selection of (a) to (d) includes: (a) the nucleotide sequence set forth in SEQ ID NO: 12, 15, 18, or 21, (b) the nucleotide sequence complementary to the nucleotide sequence set forth in SEQ ID NO: 12, 15, 18, or 21, where (a) and (b) hybridize under stringent conditions, (c) the nucleotide sequence having 90% or more sequence identity with the nucleotide sequence set forth in SEQ ID NO: 12, 15, 18, or 21, and (d) the nucleotide sequence set forth in SEQ ID NO: 12, 15, 18, or 21 in which a total of 1 to 50 nucleotides are substituted, deleted, or inserted.