AI and Rare Diseases ── Rare blood disorders ── 2026-10-08

In sickle cell disease and Gaucher disease, RBCs are phagocytosed prematurely. The figure shows DPD simulation of macrophage–RBC contact producing CD47–SIRPα trajectories. PINNs then infer parameters and reconstruct hidden states. Both diseases show diminished inhibitory signaling and altered SHP1 pathways, and anti-SIRPα antibodies are simulated. A bypass uses PIKANs instead of PINNs, more robust under noise. The output is insight for therapeutic exploration. — Image abstract — the whole article on one page (click to enlarge)

1 Rare blood disorders papers. Lead: A multiscale signaling–biophysical framework reveals mechanisms of macrophage-mediated RBC clearance in sickle cell and gaucher disease

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Rare blood disorders: treatment, trials and AI

A multiscale signaling–biophysical framework reveals mechanisms of macrophage-mediated RBC clearance in sickle cell and gaucher disease
PNAS Nexus · 2026-10-06 · Evidence: Preclinical (computational modeling study)
Abstract
Red blood cell (RBC) clearance by macrophages maintains blood homeostasis and is dysregulated in the hemolytic disorder sickle cell disease (SCD) and the lysosomal storage disorder Gaucher disease (GD), where biophysical and biochemical alterations promote premature phagocytosis. We develop a multiscale hybrid modeling framework integrating signaling dynamics, biophysical simulations, and machine learning to investigate the mechanisms governing RBC phagocytosis in these diseases. Our approach couples a systems biology model of macrophage–RBC signaling with Dissipative Particle Dynamics (DPD) simulations of molecular diffusion and membrane interactions, and leverages Physics-Informed Neural Networks (PINNs) for simultaneous parameter inference, hidden-state reconstruction, and integration of multiscale mechanistic constraints. The DPD framework provides mechanistic insight into antibody diffusion, receptor engagement, and membrane-level interactions during macrophage–RBC contact, generating spatially resolved trajectories of CD47–SIRPα signaling and antibody–receptor binding that serve as intermediate observables constraining the signaling model. The model accurately captures differential phagocytic responses between healthy and altered RBCs, revealing diminished inhibitory signaling and changes in SHP1-mediated pathways in both SCD and GD. Identifiability analysis combining Fisher Information Matrix diagnostics and profile likelihood confirms that parameters governing the CD47–SIRPα–SHP1 axis are among the most robustly recoverable, and simulations of therapeutic perturbations with anti-SIRPα antibodies demonstrate modulation of engulfment outcomes. We further employ Physics-Informed Kolmogorov-Arnold Networks (PIKANs) as an alternative to standard PINNs, demonstrating improved robustness under noise and sampling variability. More broadly, our multiscale platform linking biophysical simulation with systems-level inference is generalizable, offering mechanistic insights and computational tools for therapeutic exploration in diseases involving dysregulated phagocytosis.
Journal IF-equivalent: 7.1 (OpenAlex 2-year mean citedness, value as of 2026-10-07, retrieved 2026-10-08; not the official Clarivate IF)
Reference: Chai Z, Daryakenari NA, Karniadakis GE. A multiscale signaling–biophysical framework reveals mechanisms of macrophage-mediated RBC clearance in sickle cell and gaucher disease. PNAS Nexus. 2026 Oct 6 [Epub ahead of print]. doi:10.1093/pnasnexus/pgag348.
Checked: Abstract only

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