BiologyNovember 6, 2026

The ZFX gene and the sex difference in autism diagnosis

A Nature study points to ZFX, an X-chromosome gene, as a possible factor in the “female protective effect”; diagnostic bias remains crucial.

Autism is diagnosed more often in boys than in girls. Part of that gap is biological; part is cultural. New work names one gene without erasing the second.

Story illustration: The ZFX gene and the sex difference in autism diagnosis

Researchers at Boston Children’s Hospital published on November 4, 2026 in Nature an analysis of gene networks in human neural progenitor cells. When they dialed down 18 autism-associated genes, they saw “transcriptomic convergence”: many other related genes also quieted. At the center of that network sits ZFX, an X-linked transcription factor.

In cells with two X chromosomes, most genes on one copy are silenced; ZFX is an exception and is expressed from both. That raises its baseline level in XX brains. The team proposes that this extra dose helps keep autism-related genes active when others are disrupted, contributing to the so-called female protective effect: autistic XX people often carry more risk variants for the same diagnosis. The Y chromosome has a relative, ZFY, with a weaker activating effect.

The authors themselves note limits: they used a single XY-derived cell line, so XX–XY comparisons and a direct test of whether raising ZFX protects are still needed. Diagnostic bias and camouflaging of traits in girls can also leave many people unrecognized. Funding included, among others, an Autism Speaks postdoctoral fellowship (13008)—an organization controversial among neurodiversity advocates; the paper does not claim autism should be “cured.”

Key facts

Published in Nature (DOI 10.1038/s41586-026-11236-6); Andersen, Talukdar, Walsh and colleagues.
Perturbing 18 ASD genes → convergence; ZFX activates many relevant genes.
ZFX escapes X inactivation and is more highly expressed in XX brains.
Funding includes Autism Speaks Postdoctoral Fellowship 13008, NIH, Simons Foundation and HHMI.

Mapping networks like ZFX helps explain biological patterns without reducing anyone to a deficit or ignoring that diagnosis also depends on how we look.

Original source: Nature