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SRPK3 Is Essential for Cognitive and Ocular Development in Humans and Zebrafish, Explaining X-Linked Intellectual

Arkaprava Roychaudhury¹, Yu-Ri Lee¹, Tae-Ik Choi¹

¹Department of Biology, Chungnam National University, Daejeon, South Korea.

Annals of Neurology

|July 29, 2024

Summary

This summary is machine-generated.

Genetic variants in the SRPK3 gene are linked to syndromic X-linked intellectual disability (XLID). Zebrafish models confirm SRPK3

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Area of Science:

Neurogenetics
Developmental Biology
Human Genetics

Background:

Intellectual disability (ID) encompasses neurodevelopmental disorders impacting intellectual and adaptive functions.
X-linked intellectual disability (XLID) arises from genetic defects on the X chromosome, affecting approximately 2 in 1,000 males.
Syndromic XLID presents with a spectrum of cognitive, behavioral, ocular, and physical impairments.

Purpose of the Study:

To identify novel genetic causes of syndromic X-linked intellectual disability (XLID).
To investigate the role of the SRPK3 gene in neurodevelopment and associated disorders.
To validate SRPK3 as a causative gene for XLID using a zebrafish model.

Main Methods:

Exome or genome sequencing to identify variants in affected individuals.
Identification of five variants (four missense, one truncating) in the SRPK3 gene across nine XLID patients from five families.
Generation and analysis of a zebrafish knockout (KO) model for the SRPK3 orthologue.

Main Results:

Patients exhibited intellectual disability, agenesis of the corpus callosum, abnormal eye movements, and ataxia.
SRPK3 variants were identified in 9 XLID patients, suggesting a pathological role in neurodevelopmental disorders.
Zebrafish KO models displayed motor and ocular deficits, cerebellar agenesis, and behavioral abnormalities mirroring human phenotypes.

Conclusions:

SRPK3 plays a critical role in the pathogenesis of syndromic X-linked intellectual disability.
These findings offer new insights into brain development, cognitive, and ocular functions.
The study highlights the utility of zebrafish models for understanding human neurodevelopmental disorders.