The Stem Cell Revolution – Seeking Alpha
Posted: July 1, 2017 at 2:45 am
By Manisha Samy, ARK analyst
Discovered nearly thirty years ago in 1988[1], stem cell technology has failed to transform the field of regenerative medicine until now. After delivering only one treatment during three decades of development, stem cell technology could finally become the all-purpose tool for repairing the body, thanks to rapid and precise genome editing techniques such as CRISPR and TALENs. Several obstacles in stem cell technology- high costs, safety concerns, and bioethical considerations are beginning to fall away. In particular, the introduction of induced pluripotent stem cells (iPSCs) eliminated many of the initial bioethical concerns stirred by the the source of stem cells. Now, advances in genome-editing is accelerating the pace of progress.
Stem cells exist in a state of possibility. Two key markers of stem cells are 1) the ability to self-renew and 2). The ability to become any specialized cell. Broadly speaking, a stem cell can evolve into any of the ~200 specialized human cell types, as illustrated in Figure 1. Directing stem cells to become any one of the 200 cell types has proven challenging.
Moreover, before the introduction of iPSCs, which are derived from adult cells, most human stem cells were sourced from human embryos or cord blood. The political and ethical controversies surrounding embryonic research curtailed stem cell funding. As a result, after a quarter century of research, bone marrow transplantation is the only FDA-approved stem cell application in the United States.
Figure 1
Breakthroughs in cheap, rapid genome-editing have re-invogored momentum in stem cell research. As shown in Figure 2, the number of publications on PubMed mentioning both stem cells and gene-editing hit a tipping point upon the discovery of CRISPR in 2012, three years after the first instance of precise TALENs-based genome-editing in human cells. Based on the current trajectory, ARK estimates that the number of scientific publications including both genome-editing and stem cells will approach 300 this year, accounting for nearly 20% of the total number of publications.
Figure 2
As illustrated in Figure 3, while the discovery of iPSC cells in 2006 boosted stem cell research noticeably beginning in 2008, the introduction of CRISPR in 2012 has further catapulted the stem cell field, with combined gene-editing and stem cell publications taking share.
Figure 3
Why Is The Addition of Gene-Editing So Important to Stem Cell Research and Therapy?
Figure 4
Ultimately, CRISPR edited iPSCs should unlock the code to human disease at a cellular level. Three public CRISPR companies are in a good position for the impending stem cell revolution. Editas Medicine (EDIT) signed a stem cell pact with GlaxoSmithKline (GSK) and Biogen (BIIB) for next-gen stem-cell therapies; CRISPR Therapeutics (CRSP) CRSP),+Casebia+Therapeutics+Sign+Commercial+License+Agreement+to+MaxCyte/12664463.html" rel="nofollow">licensed a CRISPR delivery mechanism for blood stem cells and has formed a CRISPR joint venture with Bayer (BAYZF); and Intellia Therapeutics (NTLA) has partnered with biotech giant Novartis NVS to focus on stem-cell based therapies. These companies, among others, finally might unleash the limitless possibilities that stem cells once promised in regenerative medicine, extending human life spans considerably.
Notes
[1] The Weissman Lab at Stanford University first isolated hematopoietic (blood) stem cells from mice bone marrow in 1988; it would be another decade before human stem cells were isolated.
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