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Transcriptome regulation in iPSC and astrocyte derived from CLN3 deficient patient

ABSTRACT: CLN3 Batten disease is a severe pediatric neurodegenerative disorder caused by mutations in the CLN3 gene, most commonly a 1 kb deletion affecting exons 7 and 8. While research has focused on neuronal dysfunction, glial cells are increasingly recognized as key contributors to disease pathology. Here, we establish the iPSC and astrocyte model derived from a CLN3 patient fibrpblast cells with the 1 kb deletion and analyse the transcriptome regulation in both iPSC and astrocyte stages.

ORGANISM(S): Homo sapiens

PROVIDER: GSE299622 | GEO | 2026/09/09

REPOSITORIES: GEO

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Modeling CLN3 Batten disease in astrocytes reveals dysfunctions in mitochondria, fatty acid metabolism and chromatin dynamics

Project description:CLN3 Batten disease is a severe pediatric neurodegenerative disorder caused by mutations in the CLN3 gene, most commonly a 1 kb deletion affecting exons 7 and 8. While research has focused on neuronal dysfunction, glial cells are increasingly recognized as key contributors to disease pathology. Among them, astrocytes, the most abundant glial cell type in the brain, are essential for neuron health and may play critical roles in disease progression. Here, we present the first iPSC-derived astrocyte model from a patient with the 1 kb deletion. Transcriptomic and proteomic analyses during astrocyte differentiation revealed significant disruptions in mitochondrial function, fatty acid metabolism, and oxidative stress, with minimal impact on lysosomal homeostasis. These findings prompt the hypothesis that mitochondrial dysfunction may precede lysosomal defects in CLN3-deficient astrocytes. Restoring mitochondrial health could improve brain metabolism, inflammation control, neurotransmitter regulation, and neuronal survival, highlighting mitochondria as promising therapeutic targets in CLN3 Batten disease.

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Lysosomal alterations and altered electrophysiological activity in atypical juvenile neuronal ceroid lipofuscinoses (CLN3 1 kb deletion, E295K) patient-derived cortical neurons

Project description:Juvenile neuronal ceroid lipofuscinoses (JNCL) is a lysosomal storage disorder associated with fatal neurodegeneration that is caused by mutations in CLN3. Most individuals with JNCL carry at least one allele with 1 kb deletion in CLN3 which results in the deletion of exons 7 and 8. There is a need for more physiologically relevant human cell-based JNCL models to better understand the cellular changes during the disease process. Using CRISPR/Cas9, we have corrected a 1 kb deletion mutation in human induced pluripotent stem cells (iPSC) of a compound heterozygous patient (CLN3 Δ1 kb and E295K), to generate an isogenic control to be used for disease modeling along with the unedited CLN3 patient iPSCs. iPSC-derived neurons carrying this particular CLN3 mutation, CLN3 neurons, had lower levels of spike, burst and network burst activity for most of the culture period. Proteomics analysis showed downregulation of proteins related to axon guidance and endocytosis on day in vitro (DIV) 14 and 42 in CLN3 neurons. This was accompanied by an increase in lysosomal-related proteins in CLN3 neurons. Western blot analysis of LAMP1 expression revealed a new finding where LAMP1 was hyperglycosylated in CLN3 neurons on DIV 14, 28 and 42, which was not apparent in control neurons. Ultrastructural analysis of CLN3 neurons showed numerous membrane-bound vacuoles containing diverse types of storage material, ranging from curvilinear deposits, multilamellar structures to osmiophilic deposits. Our findings suggest alterations in lysosomal function and neurodevelopment involving axon guidance and synaptic transmission in CLN3-deficient neuronal derivatives, which could be potential targets for therapy.

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CLN3 patients with differing progression of the disease

2011-06-08 | GSE22225 | GEO

CLN3 patients with differing progression of the disease

Project description:Mutations in the CLN3 gene lead to juvenile neuronal ceroid lipofuscinosis, a pediatric neurodegenerative disorder characterized by visual loss, epilepsy and psychomotor deterioration. Although most CLN3 patients carry the same 1 kb deletion in the CLN3 gene, their disease phenotype can be variable. The aims of this study were (1) to identify genes that are dysregulated in CLN3 disease regardless of the clinical course that could be useful as biomarkers, and (2) to find modifier genes that affect the progression rate of the disease. Genome-wide expression profiling was performed in 8 CLN3 patients, homozygous for the 1 kb deletion, with different disease progression and compared to seven age and gender matched controls. Lymphocytes from eight patients diagnosed with CLN3 disease,all homozygous for the 1 kb deletion in the CLN3 gene and classified as having rapid (n = 2), average (n=4), and slow disease progression (n = 2), were used. These eight patients did not receive anticonvulsive medication. In addition, lymphocytes of seven age and gender matched controls were included in the study. Lymphocytes were prepared from fresh patient blood samples by Ficoll-gradient centrifugation (BiocollM-BM-., Biochrom AG, Berlin, Germany) according to the manufacturerM-bM-^@M-^Ys protocol and used for RNA isolation (RNeasyM-BM-. Micro Kit, Qiagen, Hilden, Germany).

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Transcriptome regulation in iPSC and astrocyte derived from CLN3 deficient patient

Project description:Transcriptome regulation in iPSC and astrocyte derived from CLN3 deficient patient

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