TAp73 regulates ATP7A: possible implications for ageing-related diseases

Area of Science:

• Molecular Biology
• Genetics
• Cellular Biology

Background:

• The p53 family member p73 regulates diverse cellular functions, with its deletion linked to tumorigenesis, infertility, neurological defects, and immune system alterations.
• Understanding the precise transcriptional targets and functional overlap of p73 with other p53 family members remains incomplete.

Purpose of the Study:

• To identify novel transcriptional targets of TAp73.
• To investigate the functional relationship between TAp73 and its newly identified target, ATP7A.
• To explore the potential role of the TAp73/ATP7A axis in human diseases.

Main Methods:

• Utilized various cellular models to study the effect of TAp73 modulation on ATP7A expression.
• Performed chromatin immunoprecipitation (ChIP) to confirm direct binding of TAp73 to ATP7A genomic regions.
• Analyzed human lung cancer patient expression profile datasets using bioinformatic approaches.

Main Results:

• Identified ATP7A, a P-type ATPase implicated in neurodegeneration and chemoresistance, as a novel direct transcriptional target of TAp73.
• Demonstrated that TAp73 directly binds to ATP7A genomic regions.
• Showed that TAp73 expression levels influence basal ATP7A expression in cellular models.
• Bioinformatic analysis suggested a potential role for the TAp73/ATP7A axis in human lung cancer.

Conclusions:

• This study reveals ATP7A as a novel TAp73-dependent target.
• The TAp73/ATP7A axis may play a significant role in the pathogenesis of cancer and age-related neurodegenerative diseases.