Elevated fetal steroidogenic activity in autism

Area of Science:

• Neuroendocrinology
• Developmental Biology
• Psychiatry

Background:

• Autism spectrum disorder (ASD) affects males more frequently than females.
• Steroid hormones are implicated in early fetal brain development, potentially influencing ASD risk.
• Previous research suggests a link between prenatal hormone exposure and neurodevelopmental outcomes.

Purpose of the Study:

• To investigate the association between prenatal exposure to specific steroid hormones and the later development of autism.
• To determine if elevated fetal steroidogenic activity is a biological risk factor for autism in males.

Main Methods:

• Utilized amniotic fluid samples from the Danish Historic Birth Cohort (1993-1999).
• Measured concentrations of Δ4 sex steroids (progesterone, 17α-hydroxy-progesterone, androstenedione, testosterone) and cortisol using liquid chromatography tandem mass spectrometry.
• Compared hormone levels in males diagnosed with autism, Asperger syndrome, or Pervasive Developmental Disorder-Not Otherwise Specified (PDD-NOS) against matched controls.

Main Results:

• A positive association was observed among all measured hormones, indicating a generalized steroidogenic factor.
• Males later diagnosed with autism exhibited significantly elevated levels of hormones related to this generalized steroidogenic factor (Cohen's d=0.37, P=0.0009).
• This elevation was consistent across different autism spectrum disorder diagnostic labels.

Conclusions:

• Provides the first direct evidence of increased fetal steroidogenic activity in individuals with autism.
• Prenatal elevations in steroid hormones may act as an epigenetic programming mechanism in fetal development.
• These hormonal changes could interact with other factors contributing to autism pathophysiology.