Related Experiment Video
Updated: Nov 15, 2025
07:38
Strategies for Assessing Autistic-Like Behaviors in Mice
Published on: September 20, 2024
1.7K
Sex-dependent role for EPHB2 in brain development and autism-associated behavior
Ahlem Assali1, Jennifer Y Cho1,2, Evgeny Tsvetkov1
1Department of Neuroscience, Medical University of South Carolina, Charleston, SC, USA.
Summary
Reduced EPHB2 gene function in mice caused autism spectrum disorder (ASD)-like behaviors, particularly in females. This EPHB2 hypofunction impacts motor cortex neuron activity, suggesting a role in ASD pathophysiology.
Area of Science:
- Neuroscience
- Genetics
- Developmental Biology
Background:
- Autism spectrum disorder (ASD) involves social communication deficits and repetitive behaviors, often with comorbidities.
- EPHB2, a gene encoding a receptor tyrosine kinase, is implicated in neural development and identified as a potential ASD risk gene.
- A specific mutation (Q857X) in EPHB2 was found in an ASD patient, suggesting EPHB2's role in the disorder.
Purpose of the Study:
- To investigate the functional consequences of EPHB2 disruption in the context of ASD.
- To determine if EPHB2 hypofunction can recapitulate ASD-associated phenotypes in a mouse model.
- To explore potential sex-specific effects of EPHB2 disruption on behavior and neural function.
Main Methods:
- Generated a mouse model with global disruption of one EphB2 allele (EphB2+/-).
- Assessed behavioral phenotypes in EphB2+/- mice, including repetitive behaviors, hyperactivity, and learning/memory.
- Performed electrophysiological recordings in motor cortex layer V pyramidal neurons to examine neuronal excitability and synaptic function.
Main Results:
- The Q857X mutation resulted in a truncated EPHB2 protein lacking forward signaling.
- EphB2+/- mice exhibited behavioral phenotypes resembling ASD and associated symptoms.
- Sex-specific effects were observed: female EphB2+/- mice showed increased repetitive behavior, hyperactivity, and learning deficits, unlike males.
- Motor cortex neurons in female EphB2+/- mice displayed increased intrinsic excitability, without altering the excitatory/inhibitory balance.
Conclusions:
- EPHB2 hypofunction is sufficient to induce ASD-associated behaviors and altered cortical function in mice.
- The findings highlight a significant role for EPHB2 in ASD pathophysiology, with pronounced sex-specific effects.
- Altered neuronal excitability in the motor cortex may underlie the observed sex-specific behavioral phenotypes in EPHB2 hypomorphic mice.
Related Concept Videos
01:22Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal
2.4K
Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
2.4K
01:19Autism Spectrum Disorder
586
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.
586
01:28Causes of Social Behavior III: Biological and Environmental Influences
127
Social behavior is a complex phenomenon that arises from the interaction between biological predispositions and environmental influences. This intricate interplay shapes how individuals think, feel, and act in various social contexts. Understanding these mechanisms requires insights from psychology, neuroscience, genetics, and evolutionary theory.Environmental Influences on Social BehaviorEnvironmental factors, including temperature, odors, and visual stimuli, play a crucial role in shaping...
127
01:31Neurotransmitters
2.1K
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.
2.1K
02:45The Ratio of X Chromosome to Autosomes
9.1K
In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
9.1K
01:43Sex-linked Disorders
105.5K
Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
105.5K