Q01What is a Phosphorodiamidate Morpholino Oligonucleotide (PMO)?
A Phosphorodiamidate Morpholino Oligonucleotide (PMO) is a synthetic antisense oligonucleotide in which the natural ribose sugar is replaced with a six-membered morpholine ring, and the charged phosphodiester backbone is replaced with non-ionic phosphorodiamidate linkages. PMOs of 20–30 nucleotides bind complementary mRNA with high sequence specificity for gene silencing (translational blockade) or splice correction (exon skipping/inclusion). They are nuclease-resistant, fully water-soluble, and exhibit minimal off-target and immune-stimulatory effects. Four FDA-approved drugs for Duchenne Muscular Dystrophy — eteplirsen, golodirsen, viltolarsen, and casimersen — are PMO-based.
Q02Where can I buy custom PMOs in India?
GenElixir® in Visakhapatnam, Andhra Pradesh is India's only dedicated manufacturer of custom Phosphorodiamidate Morpholino Oligonucleotides (PMOs). Founded in 2019, GenElixir synthesizes custom-sequenced PMOs, GMO-PMO chimeras, and morpholino monomers (Trityl-protected and Fmoc-protected, in both standard and Chlorophosphoramidate-activated forms) for the full range of antisense research needs. Orders ship within India in 5 business days at 40–60% lower cost than US or EU suppliers. Contact sales@genelixir.com or call +91 897 773 4216.
Q03What is a GMO-PMO chimera?
A GMO-PMO chimera is a patented self-transfecting antisense oligonucleotide developed by GenElixir®. It integrates guanidinium-functionalized morpholino (GMO) units into a standard PMO backbone, enabling the molecule to enter mammalian cells without transfection reagents, viral vectors, or electroporation. The technology is protected by US Patents 9,914,745 B2 and 12,012,427 B2, plus India Patent 523395. It is positioned as an alternative to Gene Tools' Vivo-Morpholinos with reduced toxicity, no excess guanidinium, and lower effective dosing.
Q04How does GenElixir compare to Gene Tools LLC?
Gene Tools LLC (Philomath, Oregon, USA) is the historical near-monopoly supplier of custom PMOs for research. GenElixir® offers comparable PMO chemistry plus a proprietary self-transfecting GMO-PMO chimera (US-patented) that Gene Tools does not have. Key differences:
• Cost: GenElixir is 40–60% lower than Gene Tools
• Speed: 5-day shipping within India vs. 1–2 weeks from Oregon
• Monomers: GenElixir manufactures full A/C/T/G ranges in four sub-families: SMMT (Trityl standard), SMMF (Fmoc standard), CMMT (Trityl CPA-activated), and CMMF (Fmoc CPA-activated); Gene Tools supplies only limited monomers
• Self-transfecting tech: Patent-protected GMO-PMO chimera vs. Gene Tools' Vivo-Morpholinos (dendrimer-conjugated)
Q05What is the difference between a PMO and a GMO-PMO chimera?
A standard PMO is a non-ionic antisense oligomer that typically requires external transfection reagents, electroporation, or viral vectors to enter mammalian cells efficiently. A GMO-PMO chimera incorporates guanidinium-functionalized morpholino residues that confer cell-permeability — the chimera enters cells autonomously without transfection agents, with minimal toxicity and at lower effective doses. The GMO-PMO chimera is GenElixir's patent-protected technology and is sequence-customized to the target mRNA just like a standard PMO.
Q06What end modifications are available on PMOs and GMO-PMO chimeras?
GenElixir offers five end modifications at either the 3′ or 5′ terminus of PMO and GMO-PMO chimera oligomers:
1. BODIPY — fluorescent tracker for intracellular localization (λex 498 nm, ε = 79,000 cm⁻¹ M⁻¹)
2. Alkyne-Serine — click chemistry handle for CuAAC or SPAAC conjugation with azide-bearing payloads
3. TEG-Cysteine — Michael addition (thiol-maleimide) handle with triethylene glycol spacer for aqueous solubility
4. DEG-Cysteine — compact thiol-maleimide handle with diethylene glycol spacer
5. Triethylene Glycol — neutral PEG-like spacer that improves solubility and reduces nonspecific binding
Q07What is the minimum order quantity?
Custom oligomers (Category MO): 250 nmol minimum, with 400 nmol and 500 nmol standard scales. Larger quantities are available on inquiry. Gram-scale production is available from 2027 via industry partnership.
Morpholino monomers (Category MM): 1 gram minimum. Contact us for current pricing. Kilogram-scale supply is available from Q1 2027.
Q08Which FDA-approved drugs use PMO chemistry?
Four FDA-approved drugs use Phosphorodiamidate Morpholino Oligonucleotide chemistry, all developed by Sarepta Therapeutics and Nippon Shinyaku for Duchenne Muscular Dystrophy (DMD):
• Eteplirsen (Exondys 51) — exon 51 skipping
• Golodirsen (Vyondys 53) — exon 53 skipping
• Casimersen (Amondys 45) — exon 45 skipping
• Viltolarsen (Viltepso) — exon 53 skipping
These approvals validate the clinical safety and efficacy of PMO chemistry for rare and genetic diseases.
Q09Does GenElixir provide certificates of analysis?
Yes. GenElixir provides HPLC-purity certificates of analysis (CoA) for all monomer batches, certifying ≥95% purity. CoAs are available for an additional fee and are typically delivered with the shipment. All in-house QC is performed at the Visakhapatnam manufacturing facility using standardized HPLC methods. Custom oligomer batches include synthesis confirmation and a quality summary.
Q10How fast does GenElixir deliver?
Within India: Morpholino monomer orders ship in 5 business days — dramatically faster than the 1–2 weeks typical of US-based suppliers (Gene Tools) or 2–4 weeks from China-based suppliers (Hongene, WuXi).
International: US/EU shipments are handled via our New Jersey office with appropriate transit timelines and documentation.
Custom oligomers: Synthesis time depends on sequence length, scale, and modifications, and is confirmed at the time of quotation.
Q11Are PMOs water-soluble and non-toxic?
Yes — these are two of the defining advantages of PMO chemistry. PMOs are fully water-soluble and require no organic co-solvents for formulation. The phosphorodiamidate backbone is non-ionic, which means PMOs exhibit minimal immune stimulation, very low off-target effects, and are non-toxic to mammalian cells at effective doses. These properties underpin their use in four FDA-approved therapeutic drugs.
Q12How do I order a custom PMO from GenElixir?
Custom PMO and GMO-PMO orders take 5 steps:
1. Specify product type: Standard PMO or GMO-PMO Chimera
2. Provide your 5′→3′ nucleotide sequence (use lowercase 'g' for guanidinium-modified residues in GMO chimeras)
3. Select scale: 250 / 400 / 500 nmol (or specify larger)
4. Specify end modifications (BODIPY, Click handles, TEG/DEG spacers) if required
5. Email sales@genelixir.com — formal quotation within 2 business days
