Identification of Vulnerable Interneuron Subtypes in 15q13.3 Microdeletion Syndrome Using Single-Cell Transcriptomics

Area of Science:

• Neuroscience
• Genetics
• Developmental Biology

Background:

• Rare copy number variants (CNVs) are associated with neurodevelopmental disorders.
• Identifying specific genes and mechanisms disrupted by CNVs is challenging due to their large size.

Purpose of the Study:

• To develop and validate a novel strategy for predicting the impact of CNV genes on brain development.
• To investigate the role of the 15q13.3 microdeletion in cortical interneuron development and associated behaviors.

Main Methods:

• Analysis of single-cell transcriptomics datasets of cortical interneurons.
• Validation in mouse models of 15q13.3 microdeletion and Klf13 deficiency.
• Assessment of gene expression patterns, precursor proliferation, interneuron density, and behavioral changes.

Main Results:

• Klf13 expression in neural precursors and neuroblasts, peaking during specific embryonic developmental stages.
• Impaired precursor proliferation in medial and caudal ganglionic eminences linked to Klf13 expression patterns.
• Klf13 deficiency in mice led to reduced cortical interneurons and altered locomotor and anxiety-related behaviors.

Conclusions:

• The impact of 15q13.3 microdeletion on precursor proliferation is mediated by reduced Klf13 expression.
• Klf13 deficiency is a likely cause of perturbed cortical interneuron density and associated behavioral defects.
• This study highlights the vulnerability of cortical interneurons during critical developmental periods in 15q13.3 microdeletion.