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Fragile X syndrome, the most common form of inherited intellectual disability, may be unfolding in brain cells even before birth, despite typically going undiagnosed until age 3 or later.
Such high expression levels may account for the condition’s sex bias, a new preprint suggests — but not everyone agrees with that logic.
Siblings of autistic females are more likely to have autism than siblings of autistic males are, and mothers of autistic children carry more common, autism-linked variants than fathers do.