JNK-Mediated BRD4 Functional Switching as a Mechanistic Bridge Between Low-Power Radiofrequency Exposure and Neurodevelopmental Disruption in Human Cortical Organoids: A Computational Reanalysis and Mechanistic Hypothesis

Cakir et al. (2025) demonstrated that continuous exposure to a consumer Bluetooth module delays radial-glia differentiation, induces human endogenous retrovirus (HERV) expression, and upregulates autism-associated transcription in human cortical organoids, effects rescued by BET bromodomain inhibitors. However, the upstream molecular switch connecting low-power radiofrequency (RF) exposure to BET-protein involvement was not identified. Here we report a pre-registered computational reanalysis of the deposited single-cell transcriptomic and epigenomic data (GSE302899) that reproduces the direction of two of the study's central findings: directional SFARI autism-gene enrichment (scRNA-seq, NES +1.61, FDR 0.007) and the iBET chromatin-rescue mechanism (scATAC-seq: of 1,568 RF-opened chromatin sites, 49% reclosed under iBET versus a 3% genome-wide baseline). We propose that these observations are connected by a recently characterized stress-responsive molecular switch: JNK-mediated phosphorylation of BRD4 (Devaiah et al., 2024), which triggers BRD4 release from its normal chromatin-maintenance positions and redistributes it to stress-responsive loci. Because BRD4 associates with LTR-driven transcription, its redistribution is proposed to amplify HERV transcription and stress-responsive gene expression at accessible loci, and BET inhibitors rescue both by stripping BRD4 from these targets. We identify JNK as the candidate upstream kinase linking RF-induced calcium influx to BRD4 redistribution, a testable claim with a specific discriminating experiment. We outline the biophysical plausibility of RF-induced calcium influx as the upstream trigger, identify the temporal structure of frequency-hopping signals as a candidate bioactive feature warranting direct experimental testing, and propose a strongly discriminating three-arm experiment (frequency-hopping versus continuous-wave versus sham, at matched specific absorption rate) with JNK/BRD4 phosphorylation and HERV transcript levels as primary endpoints. This framework provides a testable mechanistic model for how anthropogenic radiofrequency fields may interface with human cortical development through established stress-kinase and epigenetic pathways.