Genetic Investigation and Transcriptome Profiling in a Nuclear Family With Peutz-Jeghers Syndrome.

Area of Science:

• Genetics
• Molecular Biology
• Oncology

Background:

• Peutz-Jeghers syndrome (PJS) is a rare genetic disorder characterized by specific physical markers and an increased risk of various cancers.
• It is primarily caused by pathogenic variants in the tumor suppressor gene STK11.
• The precise correlation between PJS genotype and its diverse clinical manifestations remains incompletely understood.

Purpose of the Study:

• To investigate the genetic underpinnings of Peutz-Jeghers syndrome in a specific family.
• To explore the molecular consequences of a novel genetic combination involving STK11 deletion and TP53AIP1 variant.
• To elucidate the impact on key cellular signaling pathways.

Main Methods:

• Genetic analysis of a PJS family, including whole gene deletion detection and variant segregation analysis.
• RNA sequencing (RNA-seq) to assess global gene expression changes.
• Quantitative real-time PCR (qRT-PCR) to validate specific gene expression levels.

Main Results:

• Identification of a heterozygous STK11 whole gene deletion coupled with a heterozygous TP53AIP1 variant in affected family members.
• Significant downregulation of STK11, TP53, and TP53AIP1 gene expression and p53 pathway components.
• Upregulation of Wnt signaling pathway effectors observed in cells from an affected individual.

Conclusions:

• The study highlights a unique genetic profile in PJS involving STK11 deletion and a TP53AIP1 variant.
• Transcriptome dysregulation, particularly affecting p53 and Wnt signaling, is implicated in this PJS presentation.
• Further research into mutational burden may aid in predicting PJS disease prognosis.