Generating a new mouse model for nuclear PTEN deficiency by a single K13R mutation

Area of Science:

• Molecular Biology
• Genetics
• Neuroscience

Background:

• Phosphatase and tensin homolog deleted on chromosome ten (PTEN) is crucial in human diseases like cancer and neurological disorders.
• PTEN acts as a dual phosphatase, dephosphorylating lipids and proteins at various cellular locations, including the plasma membrane and nucleus.
• Understanding PTEN's specific roles in different cellular compartments is vital for elucidating PTEN-associated disease pathogenesis.

Purpose of the Study:

• To investigate the in vivo function of nuclear PTEN.
• To generate and characterize a mouse model with impaired nuclear localization of PTEN.

Main Methods:

• Utilized CRISPR-Cas9 gene editing to create a mouse line with a specific mutation (K13R) in the PTEN gene.
• Assessed PTEN localization, stability, and activity in the generated PTEN_K13R mice.
• Evaluated the neurological and developmental phenotypes of PTEN_K13R mice.

Main Results:

• PTEN_K13R mice exhibited significantly reduced PTEN nuclear localization.
• The mutation did not affect PTEN protein stability, phosphatase activity, or C-terminal phosphorylation.
• PTEN_K13R mice displayed smaller neurons and developed microcephaly, indicating neurological abnormalities.

Conclusions:

• The PTEN_K13R mouse model effectively isolates the role of nuclear PTEN.
• This model is valuable for studying the specific functions of PTEN in the nucleus in vivo.
• Findings highlight the critical role of nuclear PTEN in neuronal development and brain size.