Sex/gender differences and autism: setting the scene for future research

Area of Science:

• Neuroscience
• Genetics
• Psychiatry

Background:

• Autism prevalence shows a male bias, prompting extensive research into sex/gender differences.
• Existing research on sex/gender and autism is complex, with findings not always aligning.
• Key questions regarding sex/gender differences in autism remain underaddressed.

Purpose of the Study:

• To propose a novel 4-level conceptual framework to clarify themes in sex/gender differences and autism research.
• To better understand the implications of current research and guide future study design.
• To provide a structured approach for summarizing findings and identifying research gaps.

Main Methods:

• A comprehensive literature search of PubMed was conducted using terms related to sex/gender and autism.
• 1,906 articles were screened, with an additional review of identified publications.
• 329 relevant articles were systematically reviewed to inform the conceptual framework.

Main Results:

• Level 1: Addresses nosological and diagnostic challenges in defining autism in males and females.
• Level 2: Examines sex/gender-independent and dependent characteristics, comparing males and females with autism.
• Level 3: Investigates general etiological models, focusing on sex/gender liability and threshold.
• Level 4: Explores specific etiological-developmental mechanisms implicated by sex/gender differentiation.

Conclusions:

• The 4-level framework facilitates clearer summarization of research findings on sex/gender and autism.
• It enhances understanding of inter-level findings and their implications.
• The framework suggests future research directions, methodologies, and specific topics for the field.