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Somatic SF3B1 hotspot mutation in prolactinomas.

Chuzhong Li1,2,3,4, Weiyan Xie1, Jared S Rosenblum5

  • 1Department of Cell Biology, Beijing Neurosurgical Institute, Capital Medical University, Beijing, 100070, China.

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A common SF3B1 mutation drives prolactinoma growth, leading to higher prolactin levels and shorter progression-free survival. This discovery offers a potential target for new prolactinoma treatments.

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Area of Science:

  • Endocrinology
  • Genetics
  • Oncology

Background:

  • Prolactinomas, pituitary tumors secreting prolactin, have poorly understood genetic underpinnings and clinical relevance.
  • Identifying specific genetic mutations is crucial for understanding tumor pathogenesis and developing targeted therapies.

Purpose of the Study:

  • To identify somatic mutations in prolactinomas using whole genome sequencing.
  • To investigate the clinical relevance and functional consequences of identified mutations.

Main Methods:

  • Whole genome sequencing (WGS) was performed on 21 prolactinoma samples.
  • Somatic mutations were validated using digital polymerase chain reaction (PCR) in 227 prolactinoma tissue samples.
  • Functional impact of mutations on gene splicing and protein interactions was analyzed.

Main Results:

  • A hotspot somatic mutation, SF3B1R625H, was identified in 19.8% of prolactinomas.
  • Patients with SF3B1R625H-mutant prolactinomas showed significantly higher prolactin (PRL) levels and shorter progression-free survival (PFS).
  • The SF3B1R625H mutation induced aberrant splicing of ESRRG, enhancing Pit-1 binding and leading to excessive PRL secretion.

Conclusions:

  • The study validates SF3B1R625H as a key mutation in a subset of prolactinomas.
  • A novel mechanism involving SF3B1, ESRRG splicing, and Pit-1 activation in prolactinoma pathogenesis was elucidated.
  • This finding may pave the way for targeted therapeutic strategies for prolactinomas.