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Tuesday, April 21, 2020

Long-read sequencing for rare human genetic diseases.

During the past decade, the search for pathogenic mutations in rare human genetic diseases has involved huge efforts to sequence coding regions, or the entire genome, using massively parallel short-read sequencers. However, the approximate current diagnostic rate is

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Tuesday, April 21, 2020

Large Fragment Deletions Induced by Cas9 Cleavage While Not in BEs System in Rabbit

CRISPR-Cas9 and BEs system are poised to become the gene editing tool of choice in clinical contexts, however large fragment deletion was found in Cas9-mediated mutation cells without animal level validation. By analyzing 16 gene-edited rabbit lines (including 112 rabbits) generated using SpCas9, BEs, xCas9 and xCas9-BEs with long-range PCR genotyping and long-read sequencing by PacBio platform, we show that extending thousands of bases fragment deletions in single-guide RNA/Cas9 and xCas9 system mutation rabbit, but few large deletions were found in BEs-induced mutation rabbits. We firstly validated that no large fragment deletion induced by BEs system at animal level, suggesting…

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Tuesday, April 21, 2020

Long-read sequencing identifies GGC repeat expansions in NOTCH2NLC associated with neuronal intranuclear inclusion disease.

Neuronal intranuclear inclusion disease (NIID) is a progressive neurodegenerative disease that is characterized by eosinophilic hyaline intranuclear inclusions in neuronal and somatic cells. The wide range of clinical manifestations in NIID makes ante-mortem diagnosis difficult1-8, but skin biopsy enables its ante-mortem diagnosis9-12. The average onset age is 59.7 years among approximately 140 NIID cases consisting of mostly sporadic and several familial cases. By linkage mapping of a large NIID family with several affected members (Family 1), we identified a 58.1 Mb linked region at 1p22.1-q21.3 with a maximum logarithm of the odds score of 4.21. By long-read sequencing, we identified…

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Tuesday, April 21, 2020

Development of CRISPR-Cas systems for genome editing and beyond

The development of clustered regularly interspaced short-palindromic repeat (CRISPR)-Cas systems for genome editing has transformed the way life science research is conducted and holds enormous potential for the treatment of disease as well as for many aspects of biotech- nology. Here, I provide a personal perspective on the development of CRISPR-Cas9 for genome editing within the broader context of the field and discuss our work to discover novel Cas effectors and develop them into additional molecular tools. The initial demonstra- tion of Cas9-mediated genome editing launched the development of many other technologies, enabled new lines of biological inquiry, and motivated…

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Tuesday, April 21, 2020

Linking CRISPR-Cas9 interference in cassava to the evolution of editing-resistant geminiviruses.

Geminiviruses cause damaging diseases in several important crop species. However, limited progress has been made in developing crop varieties resistant to these highly diverse DNA viruses. Recently, the bacterial CRISPR/Cas9 system has been transferred to plants to target and confer immunity to geminiviruses. In this study, we use CRISPR-Cas9 interference in the staple food crop cassava with the aim of engineering resistance to African cassava mosaic virus, a member of a widespread and important family (Geminiviridae) of plant-pathogenic DNA viruses.Our results show that the CRISPR system fails to confer effective resistance to the virus during glasshouse inoculations. Further, we find…

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