# Evidence of neurocognitive and resting state functional connectivity differences in carriers of NRXN1 deletions

## TL;DR

This study finds that people with NRXN1 gene deletions have lower IQ and brain connectivity differences compared to those without the deletion.

## Contribution

The study provides new evidence linking NRXN1 deletions to specific neurocognitive and brain functional connectivity differences.

## Key findings

- NRXN1 del carriers had lower IQ and worse spatial working memory than controls.
- Functional connectivity differences were found in visual and ventral attention networks.
- Poorer segregation between visual and default networks was observed in NRXN1 del carriers.

## Abstract

NRXN1 deletion (NRXN1 del) is a rare copy number variant associated with several neurodevelopmental, neuropsychiatric, and cognitive outcomes. The NRXN1 gene encodes for a pre-synaptic cell adhesion molecule that is important for synapse formation, regulation and neurotransmission. We used a gene-first approach to investigate neurocognitive and brain phenotypes in NRXN1 del carriers.

Forty-two participants (21 NRXN1 del carriers and 21 neurotypical age and sex-matched comparisons) completed IQ assessments, and a neurocognitive battery, including, executive function, attention, and social cognition tasks. Magnetic resonance imaging (MRI) data, including T1-weighted anatomical scans, resting state functional MRI and diffusion tensor imaging, were acquired in 36 participants (17 NRXN1 del carriers and 19 comparisons).

NRXN1 del carriers had lower mean IQ and poorer spatial working memory performance compared to comparisons (p ≤ 0.05). Neuroimaging results revealed group differences in visual and ventral attention resting state networks (p < 0.05). Network-based statistical analysis showed a significant effect of group status for 28/115 connections, with poorer segregation between visual and default networks in NRXN1 del carriers relative to comparisons. No differences in brain structural volume or cortical thickness, or diffusion measures of white matter structural architecture were observed between groups.

This exploratory study provides evidence for neurocognitive impacts and brain functional differences related to underlying synaptic mechanisms. Brain functional differences in NRXN1 del carriers may support altered excitation/inhibition dynamics within the brain. Gene-first approaches may establish brain-based translational markers to identify neurobiologically informed subgroups within neurodevelopmental and neuropsychiatric conditions, and ultimately transdiagnostic therapeutic strategies.

The online version contains supplementary material available at 10.1186/s11689-025-09625-5.