Cas12i RNA Guide Design for Precise BCL11A Gene Editing
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Solution Overview
Problem
Current CRISPR-Cas systems face limitations in efficiently targeting and editing specific sequences within the BCL11A gene, particularly in achieving precise deletions adjacent to protospacer adjacent motifs (PAM) sequences.
Innovation Solution
A composition comprising an RNA guide with a spacer sequence substantially complementary to a target sequence within the BCL11A gene and a direct repeat sequence, in conjunction with a Cas12i polypeptide, forms a ribonucleoprotein complex that binds to the target nucleic acid, enabling precise editing, including deletions adjacent to PAM sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional CRISPR-Cas systems are used to target BCL11A gene, then the system can recognize and bind to target sequences, but the editing precision and deletion efficiency adjacent to PAM sequences are insufficient
Solution Approach 1:
The patent employs Cas12i polypeptide variants with modified parameters including altered PAM sequence recognition specificity (5'-NTTN-3' instead of traditional PAM requirements) and adjusted spacer sequence length requirements. These parameter changes enable the system to achieve precise editing at previously inaccessible locations adjacent to PAM sequences while maintaining high deletion efficiency in the BCL11A gene.
2Manufacturing precision
If CRISPR-Cas systems increase deletion size, then larger portions of the gene can be disrupted, but off-target activity increases
Solution Approach 1:
The patent applies local quality by designing RNA guides with specific spacer sequences that are substantially complementary to unique target sequences within the BCL11A gene (SEQ ID NOs: 1322-2632). The system achieves large precise deletions by optimizing the local binding characteristics of the Cas12i polypeptide-RNA guide complex to the specific target sequence adjacent to the 5'-NTTN-3' PAM motif, thereby increasing deletion size while minimizing off-target activity through enhanced local specificity.
3Reliability
If the spacer sequence length is increased to improve target recognition, then binding affinity increases, but the complexity of designing effective guides increases
Solution Approach 1:
The patent establishes specific parameter ranges for spacer sequence length (16-30 nucleotides) and defines clear design criteria for effective guides against the BCL11A gene. This parameter optimization balances target binding affinity with design simplicity, providing a standardized approach that reduces design complexity while ensuring reliable binding to the target sequence adjacent to the PAM motif.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for efficient and precise editing of the BCL11A gene, reducing off-target activity and achieving larger deletions compared to traditional CRISPR-Cas systems, thereby effectively disrupting gene function.
Implementation Method 1
forms a ribonucleoprotein complex that binds to the target nucleic acid
Data Source
AI summary
The present invention relates to compositions comprising RNA guides targeting BCL11A, processes for characterizing the compositions, cells comprising the compositions, and methods of using the compositions.