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Genome-wide CRISPR screenings identified SMCHD1 as a host-restricting factor for AAV transduction
Chenlu Wang1, Yu Liu2, Jingfei Xiong1
1Center of Growth Metabolism and Aging, State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China.
Structural Maintenance of Chromosomes Hinge Domain 1 (SMCHD1) restricts adeno-associated virus (AAV) gene expression. Inhibiting SMCHD1 enhances AAV transgene expression, offering potential for improved gene therapies.
Area of Science:
- Molecular Biology
- Epigenetics
- Gene Therapy
Background:
- Adeno-associated virus (AAV) gene therapy often requires high viral doses, posing safety risks due to limited understanding of host-viral interactions.
- Post-transduction viral genome processing and host factor interactions are critical for AAV efficacy.
Purpose of the Study:
- To identify host factors that regulate post-entry adeno-associated virus (AAV) transgene expression.
- To elucidate the mechanisms by which host factors influence AAV transduction.
Main Methods:
- Genome-wide CRISPR screening to identify host restriction factors.
- RNA interference (RNAi) and CRISPR interference (CRISPRi) for gene knockdown.
- CRISPR knockout (KO) to eliminate gene function.
- Analysis of transgene expression across different AAV serotypes and genome types.
Main Results:
- Structural Maintenance of Chromosomes Hinge Domain 1 (SMCHD1) was identified as a broad-spectrum host factor restricting AAV transgene expression.
- Knockdown or knockout of SMCHD1 significantly enhanced AAV transgene expression for multiple serotypes and genome types.
- SMCHD1 represses AAV transcription by forming a complex with LRIF1 and HP1, maintaining a heterochromatin-like state around the viral genome.
Conclusions:
- Host factor-induced chromatin remodeling is a critical inhibitory mechanism for AAV transduction.
- Disrupting the SMCHD1-LRIF1-HP1 complex can activate AAV transcription.
- Targeting SMCHD1 offers a potential strategy to improve AAV-based gene therapies.
