Establishment and characterization of adap1-deficient zebrafish

Area of Science:

• Neuroscience
• Developmental Biology
• Genetics

Background:

• The ADP-ribosylation factor GTPase-activating protein with dual pleckstrin homology domains 1 (adap1) gene is vital for neural differentiation and development, primarily in the mouse brain.
• The specific roles of adap1 in vertebrate morphogenesis, locomotor activity, and complex behaviors remain largely uncharacterized.

Purpose of the Study:

• To investigate the physiological functions of the adap1 gene in zebrafish, focusing on its role in behavior and development.
• To characterize the effects of adap1 gene mutations on zebrafish embryogenesis, neural gene expression, and adult behaviors.

Main Methods:

• Whole-mount in situ hybridization (WISH) was used to analyze adap1 expression patterns in zebrafish embryos.
• Zebrafish adap1 mutants were generated via frameshift mutations, and their morphology, neural gene expression, and behavioral responses were assessed.
• Behavioral analyses included spontaneous coiling, touch response, open field tests, and social behavior tests.

Main Results:

• adap1 exhibits widespread expression in the zebrafish brain during early embryogenesis.
• Zebrafish adap1 mutants displayed no significant morphological abnormalities or deficits in basic neural gene expression at 1 day postfertilization.
• Adult adap1 mutants showed altered behavior in the open field test and increased approach behavior towards visual cues of novel conspecifics.

Conclusions:

• The adap1 gene is not essential for basic zebrafish embryogenesis or locomotor activity.
• Zebrafish adap1 plays a role in regulating social approach behavior, particularly in response to visual cues from unfamiliar individuals.
• These findings highlight a novel function of adap1 in modulating social interaction and approach behaviors in vertebrates.