Why Drug Developers Choose IgG4 for Monoclonal Antibodies? – Illiasul Ibad
Illiasul Ibad, Rheumatologist at Christian Medical College, posted on X:
”1․ Why are many therapeutic monoclonal antibodies built on the IgG4 framework?
2․ Understand basics
Biology of IgG4
• Least abundant IgG subclass
• Very weak complement activation
• Poor interaction with Fc receptors → almost no ADCC
Translation: IgG4 can block targets without collateral tissue damage.
3․ Fab-arm exchange
Natural IgG4 can swap half its arms → becomes “functionally monovalent.”
Good for tolerance in nature, but bad for drug stability.
Solution: scientists engineered the S228P mutation → no swapping, molecule stays stable.
4․ Why drug developers love IgG4
• Precise blocking, not killing
• Low inflammation risk
• Engineered stability
• Safe for long-term therapy
That’s why IgG4 is the backbone of modern antibody medicines – quiet, stable, effective.”
Stay updated with Hemostasis Today.
-
May 30, 2026, 18:12Khokon Miah Akanda: FDA Approves a First-in-Class Hypertension Drug
-
May 30, 2026, 18:11Alessandro Perrella: It is Not Only about “How High the CRP is”, but “in Which Patient” We are Measuring That Value
-
May 30, 2026, 18:11Jasper van Grunsven: Grateful for Our Rare Disease Team and the Commitment That Drives Our Mission
-
May 30, 2026, 18:10Open Registration for the 2026 Thrombosis Canada Annual Education Conference – Thrombosis Canada
-
May 30, 2026, 18:09Peter Zdziarski: Approval Does Not Mean NovoSeven is 100% Effective or Risk-Free in GT
-
May 30, 2026, 17:07Deepak Yadav: A Privilege to Talk on ESUS at CREST Stroke Conclave 2026
-
May 30, 2026, 16:59Syed A Rizvi: Medical Scoring Systems – Small Numbers, Big Clinical Decisions
-
May 30, 2026, 16:53Timothy “Tim” Sheehan: BNY Wealth Joins the Fight Against Blood Disorders In Support of Hemophilia of Georgia
-
May 30, 2026, 16:51Nouf Bahri: Anticoagulation Initiation for New-Onset Atrial Fibrillation in Critical Illness