Related Experiment Video
Updated: May 14, 2026
08:44
Dynamic Clamp Methods to Investigate Impaired Neuronal Excitability Associated with Autism
Published on: October 17, 2025
Placenta-derived hypo-serotonin situations in the developing forebrain cause autism
1Department of Anatomy & Neuroscience, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashiku, Hamamatsu, Shizuoka 431-3192, Japan. ksato@hama-med.ac.jp
Medical Hypotheses
|February 5, 2013
Summary
Low serotonin from the placenta during early development may cause autism. This hypothesis suggests placental dysfunction leads to fetal forebrain serotonin deficiency, impacting brain wiring and leading to autistic traits.
Area of Science:
- Neuroscience
- Developmental Biology
- Genetics
Background:
- Autism Spectrum Disorder (ASD) is a neurodevelopmental condition characterized by social-communication deficits and repetitive behaviors.
- Disruptions in the serotonergic system are consistently implicated in ASD pathogenesis.
- Placental serotonin is the primary source for the embryonic mouse forebrain from embryonic day 10-15, a critical period for brain development.
Purpose of the Study:
- To propose a novel hypothesis linking decreased placenta-derived serotonin to the pathogenesis of autism.
- To elucidate the potential role of placental function and fetal brain development in ASD etiology.
Main Methods:
- The study is primarily theoretical, postulating a hypothesis based on existing research.
- It integrates findings on early brain development, serotonin signaling, and placental function.
Main Results:
- A hypothesis is presented: decreased placental serotonin leads to fetal forebrain hypo-serotonergic states.
- This serotonin deficiency during critical developmental periods (E10-15) may cause mis-wiring in brain regions crucial for social cognition.
- It may also lead to aberrant growth of serotonergic fibers, resulting in network dysfunction and autistic phenotypes.
Conclusions:
- Reduced placental serotonin during early gestation is a potential contributing factor to autism.
- This hypothesis highlights the importance of placental health and serotonin signaling in neurodevelopmental disorders.
- Further research is warranted to investigate the causal link between placental serotonin levels and ASD development.
Related Concept Videos
01:19Autism Spectrum Disorder
Autism spectrum disorder (ASD) is a neurodevelopmental condition marked by persistent deficits in social communication and interaction alongside restrictive and repetitive behaviors or interests. ASD is sometimes accompanied by intellectual impairment.
These core symptoms manifest differently among individuals, ranging from mild to severe. The disorder's complexity extends beyond its clinical presentation, encompassing a diverse range of biological, cognitive, and sociocultural influences.
These core symptoms manifest differently among individuals, ranging from mild to severe. The disorder's complexity extends beyond its clinical presentation, encompassing a diverse range of biological, cognitive, and sociocultural influences.
01:27Psychosis: Pathophysiology of Schizophrenia and Other Psychotic Disorders
Schizophrenia is a neurodevelopmental disorder whose origins are rooted in complex genetic components. Despite our burgeoning understanding, the pathophysiology of this disorder remains incompletely deciphered.
Researchers have identified genetic factors that increase susceptibility to schizophrenia, underscoring the intricate interplay between genetics and environment in disease development. At the core of schizophrenia's pathophysiology is excessive dopaminergic neurotransmission within the...
Researchers have identified genetic factors that increase susceptibility to schizophrenia, underscoring the intricate interplay between genetics and environment in disease development. At the core of schizophrenia's pathophysiology is excessive dopaminergic neurotransmission within the...
01:07Teratogenicity
The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
01:29Biological Causes of Schizophrenia
Schizophrenia, a severe psychiatric disorder, arises from a complex interplay of biological factors, including genetic predisposition, structural brain abnormalities, neurotransmitter dysregulation, and developmental irregularities. These factors collectively contribute to the onset and progression of the disorder, which typically manifests in late adolescence or early adulthood.
Genetic Factors in Schizophrenia
The genetic basis of schizophrenia is strongly supported by family and twin studies.
Genetic Factors in Schizophrenia
The genetic basis of schizophrenia is strongly supported by family and twin studies.
01:31Neurotransmitters
Neurotransmitters are essential chemical messengers within the nervous system, facilitating the communication between neurons. These chemical messengers, varying in function and effect, are critical for sustaining various aspects of neurological health and emotional well-being.
01:22Gut-Brain Axis
The gut–brain axis is a bidirectional communication system that connects the gastrointestinal tract and the brain. This interaction is mediated through multiple pathways, including the vagus nerve, hormonal signals, immune responses, and chemical messengers produced by gut microbes.Microbial Contributions to Brain FunctionGut microbiota contributes significantly to brain function by producing neuroactive compounds. These include neuroactive compounds that influence neurotransmitters such as...