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Drug Repurposing Hypothesis Generation Using the "RE:fine Drugs" System

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Published on: December 11, 2016

Drug Development.

Kinga Szigeti¹

¹University at Buffalo, Buffalo, NY, USA.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association

|December 25, 2025

Summary

This summary is machine-generated.

The human CHRFAM7A gene has two alleles that control monocyte cytoskeletal function, impacting their movement and adaptation to tissue stiffness. This human-specific genetic dichotomy offers potential for neuroinflammation therapies.

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Developmental Toxicity Assay Based on Real-Time Monitoring of Fibroblast Growth Factor Signal Disruption in Human Induced Pluripotent Stem Cells

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Published on: October 10, 2025

Area of Science:

Immunology
Genetics
Cell Biology

Background:

Monocyte infiltration is crucial for innate immune responses.
CHRFAM7A is a human-specific fusion gene with unknown effects on innate immunity.
The alpha-7 nicotinic acetylcholine receptor (α7 nAChR) is involved in innate immunity and the cholinergic anti-inflammatory response.

Purpose of the Study:

To investigate the functional consequences of CHRFAM7A alleles on monocyte behavior.
To understand how CHRFAM7A influences cytoskeletal dynamics and adaptation to the tissue microenvironment.

Main Methods:

Utilized induced pluripotent stem cell (iPSC)-derived microglia and monocytes, validated with primary human monocytes.
Employed live imaging of actin and tubulin, migration, and invasion assays.
Studied adaptive responses to mechanical tissue properties using hydrogel models.

Main Results:

The direct CHRFAM7A allele results in a hypomorphic α7 nAChR, activating Rac1 and promoting actin dynamics (lamellipodia formation).
The inverted structural variant (SV) allele alters ULK4 isoform ratios, acetylates α-tubulin, and stabilizes microtubules, leading to distinct locomotion (invasion vs. migration) and stiffness adaptation (lamellipodia vs. polarization).

Conclusions:

CHRFAM7A alleles confer divergent cytoskeletal gain-of-function, enabling adaptation to tissue stiffness and chemotaxis.
This human-specific, bi-allelic mechanism with equal frequencies suggests significant translational potential for neuroinflammation therapies.