Science Pool

Innovations in Oligonucleotide Synthesis for RNA-Targeted Drug Discovery

Posted by Evotec on Jul 17, 2024 2:13:46 PM

Targeting RNA represents a paradigm shift for drug discovery. The ability to seek out and destroy, or modify, a faulty RNA template, before the toxic protein has even been made, has only recently begun to be harnessed for the benefit of patients. 
At the time of writing, 21 Oligonucleotide drugs have been approved for human use, with an exponential increase in clinical trials and development projects involving this new modality. 
There exist several different mechanisms of action for Oligonucleotide drugs, all of which are transient and reversible and do not lead to alteration of patient DNA, unlike Gene therapy. 

Antisense Oligonucleotides harness endogenous systems already existing within a cell to achieve their purpose, with the only limitation being accessibility of the target tissue.
Once bound with great specificity to its RNA target, a short synthetic Oligonucleotide can trigger degradation, upregulation of the translated protein, or alteration of a splicing event leading to a correctly folded protein. Longer Oligonucleotides can fold into 3 dimensional shapes called Aptamers with similar target affinities and applications as antibodies, and shorter Oligonucleotides can act as MicroRNA   mimetics or antagonists to alter multiple targets or pathways concurrently with subtle but broader effect. 

The precision of an Oligonucleotide and its ability to correct a faulty RNA produced by an error in the genetic code, lends itself to applications in the fields of rare disease therapeutics and toxic gain of function mutations. The field of Oligonucleotide therapeutics is developing to address this as a whole and to pioneer a new preclinical and regulatory path that could be adapted for these unique disease biologies to make this type of therapeutic innovation more accessible. 

Evotec is a leader in integrated end-to-end Research and Development and has built substantial drug discovery expertise and technical capabilities that can drive new innovative and diverse modalities into the clinic. In addition, Evotec has developed a deep internal knowledge base in key therapeutic areas including neuroscience, pain, immunology, respiratory, women’s health, aging, fibrosis, inflammation, oncology, metabolic and infectious diseases. Leveraging these skills and expertise, Evotec successfully delivers on superior science-driven discovery and development alliances with pharmaceutical and biotechnology companies.

The global interest in this new modality area has led to high demand in Oligonucleotide synthesis and related chemistry applications, from modified Oligonucleotides to conjugates and complex formulations. 
Evotec offers Oligonucleotide research and development capabilities as well as ligand and linker chemistry expertise to support projects from discovery through to development.

In particular, since 2015 the discovery chemistry group is equipped with MerMade 48X synthesizers (Biosearch Technologies, see Fig. 1) with associated purification, post processing and QC platforms (at the Evotec sites of Toulouse and Verona, see Fig 2), while the development team, since 2022, is equipped with a Cytiva ÄKTA oligosyntTM synthesizer associated to the ÄKTA pureTM 150 and ÄKTA flux 6 purification platforms and with a Virtis Lyophilizer at Evotec’s state-of-the-art Verona site (see Fig. 3 to Fig. 6).

Oligo-blog-Figure1-Biosearch-MerMade-48X Oligo-blog-Figure-2-Agilent-Preparative-HPLC-for-purification
 

   Figure 1: Biosearch MerMade 48X

      Figure 2: Agilent Preparative HPLC for purification
  Oligo-blog-Figure-3-Cytiva-ÄKTA-oligosyntTM Oligo-blog-Figure4-Cytiva-ÄKTA-pureTM-150
  Figure 3: Cytiva ÄKTA oligosyntTM Figure 4: Cytiva ÄKTA pureTM 150
  Oligo-blog-Figure5-Cytiva-ÄKTA-flux-6TM Oligo-blog-Figure6-SP-Virtis-Advantage-Pro-Lyophilizer
  Figure 5: Cytiva ÄKTA flux 6TM Figure 6: SP Virtis Advantage Pro Lyophilizer
  Oligo-blog-Figure7-UPLC-Thermo-ScientificTM-Orbitrap-ExplorisTM-120-MS  
  Figure 7: UPLC with a Thermo ScientificTM Orbitrap ExplorisTM 120 mass spectrometer for oligonucleotides characterization  

This fully integrated suite of capabilities allows for the synthesis, purification, isolation, and quality control of complex modified Oligonucleotides (ASOs, siRNAs, etc) on a scale from milligrams up to 25 g (up to 12 millimoles). The objective is to support Oligonucleotide drug discovery and development projects from the earliest phases of discovery, such as the generation of screening libraries, up to the selection of a preclinical development candidate followed by manufacture and release of material to support initial preclinical development studies. 

All these activities are supported by an experienced Oligonucleotide chemistry team operating across two sites and at different scales, to ensure flexible support for projects with highly efficient information and process transfer.
Evotec capabilities also include expert analysts for Analytical Development and QC, capable of developing and validating the analytical procedures needed for a full characterization and routine testing of Oligonucleotide drug substances up to and including IND enabling studies. In addition, Evotec’s support can encompass the release of preclinical batches according to regulatory requirements, including stability and formulation studies.

The journey to commercialization can be challenging. Scaling up production while maintaining process consistency, product quality, and regulatory compliance, requires expert process development capabilities, and the adoption of innovative science and risk management methodologies. A common pitfall for the Sponsor of an innovative therapy is to under-estimate the complexity and intricacy of this enterprise, which involves the coordinated optimization of strategies for process control, risk management, data management, and supply chain management.

With ever-evolving regulatory requirements and the increasing urge to shorten drug development timelines, getting your drug to market can seem like a daunting undertaking. That’s why taking some of the pressure off your organization by outsourcing your drug development and manufacturing activities to an expert partner can be the smartest decision. This will ensure your drug is commercialized in the fastest and most cost-efficient way possible, utilizing expertise, facilities, equipment, and processes to anticipate and overcome any challenges thrown at your program with ease.

Evotec offers an integrated end-to-end solution for innovative drug R&D, with the capabilities to support all phases of your drug development program. Your projects are in safe hands with our team of expert scientists who are pioneers in QbD, process design, scale-up, and validation, operating to full cGMP within FDA, MHRA, AIFA and BfArM approved facilities.

Our experts are just a click away! 

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Tags: Drug Discovery, Medicinal Chemistry, Blog, Formulation & CMC, Hit & Target ID/Validation, In vitro Biology, IND Enabling Studies/Preclinical Development, oligonucleotides