New research uncovers early developmental brain pathways affected by various genetic forms of autism, highlighting potential for personalised treatments tailored to developmental stage and sex.
Scientists have identified biological changes shared across several genetic forms of autism, a finding that could help narrow one of the field’s biggest questions: why such a wide range of gene mutations can lead to similar developmental outcomes. Writing in Nature, researchers led by Gaia Novarino at the Institute of Science and Technology Austria said the work points to overlapping brain pathways that appear to be disrupted early in development, even when the underlying genetic causes differ.
The study builds on a long-standing problem in autism research: the condition is highly heterogeneous, with hundreds of genes linked to it and many cases shaped by a mix of inherited and spontaneous changes. Previous research has already suggested that autism’s genetic diversity may converge on common biological pathways, while other studies have shown that distinct genetic subtypes can also produce different clinical and molecular profiles. Together, that leaves researchers looking for both shared mechanisms and mutation-specific effects.
To address that, Lena Schwarz and colleagues used single-nucleus multi-omics, an approach that examines DNA, RNA activity and epigenetic marks in individual cell nuclei. By analysing more than 250 samples from mouse models carrying high-risk autism-associated genes, across two brain regions and multiple developmental stages, the team found that many mutations affected the same cell types and molecular pathways, particularly during early brain development. At the same time, each model retained a distinct molecular signature.
The changes the researchers observed were often temporary, showing up mainly as delays in cell maturation and the formation of neural connections rather than permanent damage. Many of those shifts faded about two weeks after birth. The team also found that the molecular changes tracked with altered brain activity, and that female mice responded differently from males, reinforcing the idea that autism biology may vary by sex as well as by gene. The findings add weight to earlier studies suggesting shared epigenetic patterns in autism and support the view that future treatments may need to be tailored to developmental stage, sex and genetic trajectory rather than built as one-size-fits-all therapies.
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