Modeling Tay-Sachs Disease in Astrocyte-like Cells Reveals Significant Changes in the Transcriptomic Profile

Area of Science:

• Cell Biology
• Neuroscience
• Genetics

Background:

• Tay-Sachs disease is a rare genetic disorder caused by deficient beta-hexosaminidase A (HexA) activity, leading to GM2 ganglioside accumulation and severe neurodegeneration.
• Previous research has primarily focused on neuronal mechanisms, neglecting the potential role of other central nervous system components like astroglia.

Purpose of the Study:

• To investigate the role of astrocytes in Tay-Sachs disease pathophysiology.
• To develop a novel cell model for studying disease mechanisms and potential therapeutics.

Main Methods:

• Generated an astrocyte-like model by knocking down the HEXA gene in U87MG astrocytoma cells.
• Characterized the model for key pathological features and performed transcriptomic analysis.

Main Results:

• The HexA-deficient astrocyte model exhibited lysosomal accumulation, increased neutral lipids, reduced mitochondrial mass, and elevated reactive oxygen species.
• Transcriptomic analysis identified significant alterations in pathways related to neuronal degeneration, synaptic organization, mitochondrial dysfunction, and ganglioside metabolism.

Conclusions:

• This astrocyte model recapitulates key Tay-Sachs disease cellular alterations, suggesting a significant role for non-neuronal cells in disease pathophysiology.
• The model provides a valuable platform for exploring novel mechanisms and screening therapeutic approaches for Tay-Sachs disease.