MYOC

Research includes the first-ever application of AsCas12a in vivo, optimized LNP delivery, and gene editing RNA guide modifications Data to support development of the Company’s in vivo gene editing medicines pipeline CAMBRIDGE, Mass., May 10, 2024 (GLOBE NEWSWIRE) -- Editas Medicine, Inc. (Nasdaq: EDIT), a clinical-stage gene editing company, today announced the presentation of preclinical data demonstrating several in vivo capabilities towards developing transformative in vivo gene editing medicines. The Company will report these data later today in an oral presentation at Annual Meeting of the American Society of Gene and Cell Therapy (ASGCT) in Baltimore and virtually. “Editas has made significant strides to achieve our vision of becoming a leader in in vivo programmable gene editing medicine. Our team has demonstrated multiple scientific advances, including lipid nanoparticle, or LNP, formulations to drive efficient in vivo delivery of AsCas12a messenger RNA (mRNA) and gene editing by AsCas12 nuclease in vivo, a scientific first, and guide RNA modifications to increase gene editing potency,” said Linda C. Burkly, Ph.D., Chief Scientific Officer, Editas Medicine. “Our preclinical data underscore the therapeutic promise of our in vivo capabilities towards a robust pipeline of gene editing medicines and are an important step towards confirming in vivo proof of concept by the end of the year.” Data highlights: Developed and optimized an LNP specifically for in vivo gene editing with a lipid formulation that robustly transfects the ocular trabecular meshwork. Identified modifications to the guide RNA that improve in vivo editing efficiency. Developed a mouse model of myocilin-associated primary open angle glaucoma (POAG) where expression of human mutant myocilin results in elevated intraocular pressure (IOP). Demonstrated efficacy with AsCas12a nuclease in vivo. Administered optimized LNP delivering AsCas12a mRNA and optimized gRNA into a POAG model resulting in a decrease in IOP at all doses tested. The Company also presented two poster presentations, demonstrating additional scientific advances designed to improve in vivo gene editing. The complete list of Editas Medicine ASGCT presentations are listed below, and posters and presentation materials are available on the Editas Medicine website. Oral Presentation: Title: LNP-Based Delivery of CRISPR/Cas12a for the Potential Treatment of Myocilin-Associated Glaucoma Session Date and Time: Friday, May 10, 2024, 3:45 – 5:30 p.m. ET Presentation Time: 4:00 - 4:15 p.m. Session title: Advancements in Technologies for In Vivo Gene Therapies Room: Room 324-326 Final Abstract Number: 276 Poster Presentations: Title: Chemically Modified AsCas12a Guide RNAs Improve Lipid Nanoparticle-Mediated In Vivo Gene Editing in Different Tissues Session Date and Time: Thursday, May 9, 2024, 12:00 p.m. ET Session Title: Thursday Posters: Gene Disruption and Excision Presentation Room: Exhibit Hall Final Abstract Number: 1182 Title: Metagenomic Discovery and Screening of Novel Recombinase Proteins for Targeted Integration Session Date and Time: Friday, May 10, 2024, 12:00 p.m. ET Session Title: Friday Posters: Targeted Gene Insertion Presentation Room: Exhibit Hall Final Abstract Number: 1681 About Editas Medicine As a clinical-stage gene editing company, Editas Medicine is focused on translating the power and potential of the CRISPR/Cas12a and CRISPR/Cas9 genome editing systems into a robust pipeline of treatments for people living with serious diseases around the world. Editas Medicine aims to discover, develop, manufacture, and commercialize transformative, durable, precision genomic medicines for a broad class of diseases. Editas Medicine is the exclusive licensee of Broad Institute’s Cas12a patent estate and Broad Institute and Harvard University’s Cas9 patent estates for human medicines. For the latest information and scientific presentations, please visit . Forward-Looking Statements This press release contains forward-looking statements and information within the meaning of The Private Securities Litigation Reform Act of 1995. The words ‘‘anticipate,’’ ‘‘believe,’’ ‘‘continue,’’ ‘‘could,’’ ‘‘estimate,’’ ‘‘expect,’’ ‘‘intend,’’ ‘‘may,’’ ‘‘plan,’’ ‘‘potential,’’ ‘‘predict,’’ ‘‘project,’’ ‘‘target,’’ ‘‘should,’’ ‘‘would,’’ and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Forward-looking statements in this press release include statements regarding the initiation, timing, progress and results of the Company’s preclinical studies and its research and development programs, and the timing for the Company’s receipt and presentation of data from its preclinical studies, including confirming in vivo proof-of-concept by the end of 2024. The Company may not actually achieve the plans, intentions, or expectations disclosed in these forward-looking statements, and you should not place undue reliance on these forward-looking statements. Actual results or events could differ materially from the plans, intentions and expectations disclosed in these forward-looking statements as a result of various important factors, including uncertainties inherent in the initiation and completion of pre-clinical studies and availability and timing of results from pre-clinical studies. These and other risks are described in greater detail under the caption “Risk Factors” included in the Company’s most recent Annual Report on Form 10-K, which is on the Securities and Exchange Commission, as updated by the Company’s subsequent filings with the Securities and Exchange Commission, and in other filings that the Company may make with the Securities and Exchange Commission in the future. Any forward-looking statements contained in this press release speak only as of the date hereof, and the Company expressly disclaims any obligation to update any forward-looking statements, whether because of new information, future events or otherwise. Media and Investor Contact: Cristi Barnett (617) 401-0113 cristi.barnett@editasmed.com

- ASGCT presentation demonstrates lipid nanoparticle (LNP) mediated delivery to the eye in the context of editing of the myocilin (MYOC) gene as a potential treatment for glaucoma - - Expands pipeline with new pre-clinical programs utilizing LNP mediated delivery to the liver for refractory hypertension targeting angiotensinogen (AGT) and acute hepatic porphyria (AHP) targeting 5’-aminolevulinate synthase 1 (ALAS1) - - CTX340™, targeting AGT in the liver, achieved durable editing of AGT and sustained ~30 mmHg blood pressure (BP) reduction out to 3 months in the spontaneously hypertensive rat (SHR) model, demonstrating its potential as a one-time therapeutic intervention - - CTX450™, targeting ALAS1 in the liver, achieved ~70% editing of ALAS1 and normalizes disease-associated biomarkers in acute porphyria mouse model, demonstrating its potential as a one-time therapeutic intervention - - Plans to initiate clinical trials for CTX340 and CTX450 in the second half of 2025 - ZUG, Switzerland and BOSTON, May 08, 2024 (GLOBE NEWSWIRE) -- CRISPR Therapeutics (Nasdaq: CRSP), a biopharmaceutical company focused on creating transformative gene-based medicines for serious diseases, today announced new preclinical data presented at the 27th Annual Meeting of the American Society of Cell and Gene Therapy (ASGCT) highlighting the Company’s approach to developing lipid nanoparticle (LNP) based delivery for in vivo ocular gene editing. In addition, CRISPR Therapeutics announced the expansion of its in vivo pipeline with two new programs. CTX340™ and CTX450™ utilize LNP-based delivery of CRISPR/Cas9 gene editing cargo to the liver, targeting angiotensinogen (AGT) for refractory hypertension and 5’-aminolevulinate synthase 1 (ALAS1) for acute hepatic porphyria (AHP), respectively. “Over the past two years, we have made significant progress on the development of our lipid nanoparticle platform for the delivery of CRISPR/Cas9 to the liver and are now in clinical trials with CTX310 and CTX320,” said Samarth Kulkarni, Chief Executive and Chairman of the Board of CRISPR Therapeutics. “The expansion of our in vivo pipeline speaks to the scalability of the platform and the exceptional translation capabilities of our team. We continue to add programs to treat both common and rare diseases, as we look to broaden the number of areas where CRISPR could have transformational impact.” In Vivo Pipeline Expansion CRISPR Therapeutics has established a proprietary LNP platform for the delivery of CRISPR/Cas9 to the liver. The first two in vivo programs utilizing this proprietary platform, CTX310™ and CTX320™, are directed towards validated therapeutic targets associated with cardiovascular disease, and are in on-going clinical trials. The addition of two more programs, CTX340 and CTX450, utilizing this LNP delivery technology demonstrates the modularity and scalability of the platform.Refractory hypertension is a serious unmet medical need affecting approximately 1.5 million patients in the U.S. alone. CTX340 is designed to inhibit production of hepatic angiotensinogen (AGT), a validated target to modulate the renin-angiotensin-aldosterone system (RAAS) and normalize blood pressure durably with a one-time treatment. In preclinical studies, CTX340 showed ~60% liver editing and ~90% AGT protein reduction, resulting in sustained ~30 mmHg blood pressure (BP) reduction out to 3 months in the spontaneously hypertensive rat (SHR) model.Acute hepatic porphyria (AHP) is a group of rare genetic diseases of heme biosynthesis. Symptomatic patients have acute attacks, characterized by debilitating neurovascular symptoms, as well as multiple chronic symptoms, such as pain. There are approximately 5,000 patients diagnosed with AHP in the U.S., although the disease remains underdiagnosed. CTX450 is specifically designed to inhibit production of ALAS1 in the liver, preventing accumulation of neurotoxic aminolevulinic acid (ALA) and porphobilinogen (PBG). In preclinical studies, CTX450 showed ~70% liver editing and ~97% ALAS1 protein reduction, resulting in reduction of ALA and PBG disease biomarkers to normal levels in an AHP mouse model.CRISPR Therapeutics has initiated IND/CTA-enabling studies for CTX340 and CTX450 and expects to initiate both clinical trials in the second half of 2025. ASGCT Presentation In addition to expanding the liver-targeted in vivo pipeline, CRISPR Therapeutics reported initial data demonstrating its proprietary capabilities to deliver to and edit genes in the eye, opening a potential new focus area. The data will be presented today, May 8, 2024, from 3:00 p.m. – 3:15 p.m. ET at ASGCT in an oral presentation entitled “Development of an In Vivo Non-Viral Ocular Editing Platform and Application to Potential Treatments for Glaucoma.”Glaucoma is the second leading cause of blindness worldwide. Mutations in the myocilin (MYOC) gene represent the most common genetic cause of glaucoma that affects approximately 150,000 people in the U.S. alone. In these patients, defective myocilin protein aggregates in the trabecular meshwork (TM) cells, leading to impaired outflow of aqueous humor from the anterior segment of the eye, resulting in elevated intraocular pressure. Patients with MYOC-associated glaucoma typically have an earlier onset and more rapidly progressive disease course than is seen with other causes of glaucoma. Pharmaceutical interventions carry a significant treatment burden resulting in reduced adherence to therapy and surgical interventions frequently do not lead to a durable resolution of elevated intraocular pressure (IOP). The Company has developed an LNP platform capable of delivering gene editing cargo to the TM cells in the eye. In today’s presentation, the Company presented data demonstrating efficient and specific delivery to TM cells in mouse, non-human primate, and ex vivo human eyes. The Company showed >90% editing of the MYOC gene in vitro with prioritized guide RNA, and ~90% reduction of surrogate protein expression in a mouse in vivo model after a single injection. About In Vivo ProgramsCRISPR Therapeutics has established a proprietary LNP platform for the delivery of CRISPR/Cas9 to the liver. The Company’s in vivo portfolio includes its lead investigational in vivo programs, CTX310 (directed towards angiopoietin-related protein 3 (ANGPTL3)) and CTX320 (directed towards lipoprotein(a) (Lp(a)), two validated therapeutic targets for cardiovascular disease, are in on-going clinical trials. In addition, the Company’s research and pre-clinical development candidates include CTX340 and CTX450, targeting angiotensinogen (AGT) for refractory hypertension and 5’-aminolevulinate synthase 1 (ALAS1) for acute hepatic porphyria (AHP), respectively. About CRISPR Therapeutics Since its inception over a decade ago, CRISPR Therapeutics has transformed from a research-stage company advancing programs in the field of gene editing, to a company that recently celebrated the historic approval of the first-ever CRISPR-based therapy and has a diverse portfolio of product candidates across a broad range of disease areas including hemoglobinopathies, oncology, regenerative medicine, cardiovascular, autoimmune, and rare diseases. CRISPR Therapeutics advanced the first-ever CRISPR/Cas9 gene-edited therapy into the clinic in 2018 to investigate the treatment of sickle cell disease or transfusion-dependent beta thalassemia, and beginning in late 2023, CASGEVY™ (exagamglogene autotemcel) was approved in some countries to treat eligible patients with either of those conditions. The Nobel Prize-winning CRISPR science has revolutionized biomedical research and represents a powerful, clinically validated approach with the potential to create a new class of potentially transformative medicines. To accelerate and expand its efforts, CRISPR Therapeutics has established strategic partnerships with leading companies including Bayer and Vertex Pharmaceuticals. CRISPR Therapeutics AG is headquartered in Zug, Switzerland, with its wholly-owned U.S. subsidiary, CRISPR Therapeutics, Inc., and R&D operations based in Boston, Massachusetts and San Francisco, California, and business offices in London, United Kingdom. To learn more, visit www.crisprtx.com. CRISPR THERAPEUTICS® standard character mark and design logo, CTX310™, CTX320™, CTX340™ and CTX450™ are trademarks and registered trademarks of CRISPR Therapeutics AG. The CASGEVY™ word mark and design are trademarks of Vertex Pharmaceuticals Incorporated. All other trademarks and registered trademarks are the property of their respective owners. CRISPR Therapeutics Forward-Looking StatementThis press release may contain a number of “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, as amended, including statements regarding CRISPR Therapeutics’ expectations about any or all of the following: (i) its ongoing and/or planned preclinical studies, clinical trials and pipeline products and programs, including, without limitation, the status of such studies and trials, potential expansion into new indications and expectations regarding data generally (including expected timing of data releases) as well as the data that is being presented as described above; (ii) the safety, efficacy and clinical progress of its various clinical and preclinical programs including the program described in the oral presentation and poster; (iii) the data that will be generated by ongoing and planned preclinical studies and/or clinical trials, and the ability to use that data for the design and initiation of further preclinical studies and/or clinical trials; and (iv) the therapeutic value, development, and commercial potential of CRISPR/Cas9 gene editing technologies and therapies. Without limiting the foregoing, the words “believes,” “anticipates,” “plans,” “expects” and similar expressions are intended to identify forward-looking statements. You are cautioned that forward-looking statements are inherently uncertain. Although CRISPR Therapeutics believes that such statements are based on reasonable assumptions within the bounds of its knowledge of its business and operations, forward-looking statements are neither promises nor guarantees and they are necessarily subject to a high degree of uncertainty and risk. Actual performance and results may differ materially from those projected or suggested in the forward-looking statements due to various risks and uncertainties. These risks and uncertainties include, among others: the efficacy and safety results from ongoing pre-clinical studies and/or clinical trials will not continue or be repeated in ongoing or planned pre-clinical studies and/or clinical trials or may not support regulatory submissions; pre-clinical study and/or clinical trial results may not be favorable or support further development; one or more of its product candidate programs will not proceed as planned for technical, scientific or commercial reasons; future competitive or other market factors may adversely affect the commercial potential for its product candidates; uncertainties inherent in the initiation and completion of preclinical studies for its product candidates and whether results from such studies will be predictive of future results of future studies or clinical trials; uncertainties about regulatory approvals to conduct trials or to market products; uncertainties regarding the intellectual property protection for its technology and intellectual property belonging to third parties, and the outcome of proceedings (such as an interference, an opposition or a similar proceeding) involving all or any portion of such intellectual property; and those risks and uncertainties described under the heading "Risk Factors" in CRISPR Therapeutics’ most recent annual report on Form 10-K and in any other subsequent filings made by CRISPR Therapeutics with the U.S. Securities and Exchange Commission, which are available on the SEC's website at www.sec.gov. CRISPR Therapeutics disclaims any obligation or undertaking to update or revise any forward-looking statements contained in this press release, other than to the extent required by law. Investor Contact: Susan Kim +1-617-307-7503 susan.kim@crisprtx.com Media Contact: Rachel Eides +1-617-315-4493 rachel.eides@crisprtx.com

ZUG, Switzerland and BOSTON, April 22, 2024 (GLOBE NEWSWIRE) -- CRISPR Therapeutics (Nasdaq: CRSP), a biopharmaceutical company focused on creating transformative gene-based medicines for serious diseases, today announced an oral presentation highlighting the Company's lipid nanoparticle (LNP) approach for ocular editing will be presented at the American Society of Gene & Cell Therapy (ASGCT) 2024 Annual Meeting, taking place May 7 – 11, 2024, in Baltimore, MD and virtually. The abstract describes our proprietary capabilities to deliver to and edit genes in the eye, opening a potential new focus area. Multiple LNPs as well as modified gRNAs and mRNAs were screened to achieve maximal editing in vivo. These optimized components have been applied to target myocilin (MYOC). Mutations of MYOC in trabecular meshwork cells have been linked to severe glaucomatous conditions. In human primary trabecular meshwork cells, up to 95% MYOC editing and 85% protein knockdown were seen. This novel approach aims to facilitate glaucoma treatment using transient expression of editing machinery targeting MYOC. Title: Development of an In Vivo Non-Viral Ocular Editing Platform and Application to Potential Treatments for Glaucoma Session Type: In-Person Oral Presentation Session Title: Ophthalmic and Auditory: Delivery Innovations Abstract Number: 87 Location: Room 318 – 323 Session Date and Time: Wednesday, May 8, 2024, 1:30 p.m. – 3:15 p.m. ET The accepted abstract is available online on the ASGCT website. The data are embargoed until 6:00 a.m. ET on the presentation day, Wednesday May 8, 2024. A copy of the presentation will be available at once the presentation concludes. About CRISPR Therapeutics Since its inception over a decade ago, CRISPR Therapeutics has transformed from a research-stage company advancing programs in the field of gene editing, to a company that recently celebrated the historic approval of the first-ever CRISPR-based therapy and has a diverse portfolio of product candidates across a broad range of disease areas including hemoglobinopathies, oncology, regenerative medicine, cardiovascular, autoimmune, and rare diseases. CRISPR Therapeutics advanced the first-ever CRISPR/Cas9 gene-edited therapy into the clinic in 2018 to investigate the treatment of sickle cell disease or transfusion-dependent beta thalassemia, and beginning in late 2023, CASGEVY™ (exagamglogene autotemcel) was approved in some countries to treat eligible patients with either of those conditions. The Nobel Prize-winning CRISPR science has revolutionized biomedical research and represents a powerful, clinically validated approach with the potential to create a new class of potentially transformative medicines. To accelerate and expand its efforts, CRISPR Therapeutics has established strategic partnerships with leading companies including Bayer and Vertex Pharmaceuticals. CRISPR Therapeutics AG is headquartered in Zug, Switzerland, with its wholly-owned U.S. subsidiary, CRISPR Therapeutics, Inc., and R&D operations based in Boston, Massachusetts and San Francisco, California, and business offices in London, United Kingdom. To learn more, visit CRISPR Therapeutics Forward-Looking Statement This press release may contain a number of “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, as amended, including statements regarding CRISPR Therapeutics’ expectations about any or all of the following: (i) its ongoing and/or planned preclinical studies, clinical trials and pipeline products and programs, including, without limitation, the status of such studies and trials, potential expansion into new indications and expectations regarding data generally (including expected timing of data releases) as well as the data in the above-described abstract and any associated poster and the data that is being presented as described above; (ii) the safety, efficacy and clinical progress of its various clinical and preclinical programs including the program described in the oral presentation and poster; (iii) the data that will be generated by ongoing and planned preclinical studies and/or clinical trials, and the ability to use that data for the design and initiation of further preclinical studies and/or clinical trials; and (iv) the therapeutic value, development, and commercial potential of CRISPR/Cas9 gene editing technologies and therapies. Without limiting the foregoing, the words “believes,” “anticipates,” “plans,” “expects” and similar expressions are intended to identify forward-looking statements. You are cautioned that forward-looking statements are inherently uncertain. Although CRISPR Therapeutics believes that such statements are based on reasonable assumptions within the bounds of its knowledge of its business and operations, forward-looking statements are neither promises nor guarantees and they are necessarily subject to a high degree of uncertainty and risk. Actual performance and results may differ materially from those projected or suggested in the forward-looking statements due to various risks and uncertainties. These risks and uncertainties include, among others: the efficacy and safety results from ongoing pre-clinical studies and/or clinical trials will not continue or be repeated in ongoing or planned pre-clinical studies and/or clinical trials or may not support regulatory submissions; pre-clinical study and/or clinical trial results may not be favorable or support further development; one or more of its product candidate programs will not proceed as planned for technical, scientific or commercial reasons; future competitive or other market factors may adversely affect the commercial potential for its product candidates; uncertainties inherent in the initiation and completion of preclinical studies for its product candidates and whether results from such studies will be predictive of future results of future studies or clinical trials; uncertainties about regulatory approvals to conduct trials or to market products; uncertainties regarding the intellectual property protection for its technology and intellectual property belonging to third parties, and the outcome of proceedings (such as an interference, an opposition or a similar proceeding) involving all or any portion of such intellectual property; and those risks and uncertainties described under the heading "Risk Factors" in CRISPR Therapeutics’ most recent annual report on Form 10-K and in any other subsequent filings made by CRISPR Therapeutics with the U.S. Securities and Exchange Commission, which are available on the SEC's website at . CRISPR Therapeutics disclaims any obligation or undertaking to update or revise any forward-looking statements contained in this press release, other than to the extent required by law. Investor Contact: Susan Kim +1-617-307-7503 susan.kim@crisprtx.com Media Contact: Rachel Eides +1-617-315-4493 rachel.eides@crisprtx.com