Decoding the androgen receptor splice variants.

Area of Science:

• Molecular Biology
• Oncology
• Genetics

Background:

• Multiple androgen receptor (AR) splice variants with distinct structures and functions have been identified.
• These variants often contain intronic sequences encoding peptides that replace the AR ligand-binding domain (LBD).
• AR splice variants exhibit diverse, cell-context-specific genomic functions, sometimes independent of full-length AR (AR-FL).

Purpose of the Study:

• To review the discovery, characterization, and putative functions of AR splice variants.
• To explore their role in mediating constitutively active AR signaling and therapeutic resistance.
• To highlight key research areas for establishing the clinical relevance of AR splice variants in prostate cancer.

Main Methods:

• Literature review focusing on AR splice variant research.
• Analysis of existing in vitro and clinical data on AR splice variant expression and function.
• Discussion of ongoing and needed investigations in castration-resistant prostate cancer (CRPC).

Main Results:

• AR splice variants are frequently detected in clinical specimens from hormone-therapy-treated men, albeit at lower levels than AR-FL.
• In vitro data suggest a role for AR splice variants in therapeutic resistance, but clinical validation is pending.
• AR-V7 is the most significant variant identified in CRPC, often associated with resistance.

Conclusions:

• The full functional spectrum and mechanistic basis of AR splice variants remain poorly understood.
• Clinical investigation is crucial to determine the extent to which AR splice variants mediate resistance to specific hormone therapies.
• Dissecting the functional importance of AR variants, especially AR-V7, in CRPC is essential for developing effective treatments.