application-mid-pancreatectomy-with-end-to-end-anastomosis-pancreatic

Application of Mid-Pancreatectomy with End-to-End Anastomosis in Pancreatic Benign Tumors

Mid-pancreatectomy combined with end-to-end anastomosis is a surgical procedure used to treat benign pancreatic tumors. It involves removing the tumor ...

application-robot-assisted-pancreaticobiliary-junction-resection

Application of Robot-assisted Pancreaticobiliary Junction Resection in Benign Duodenal Tumors

Robot-assisted pancreaticobiliary junction resection is a surgical technique employed to treat benign duodenal tumors. The procedure involves several key ...

Sun Yat-sen University

Gastric cancer with liver metastasis (GCLM) is highly aggressive and has a poor prognosis. This study aims to evaluate the survival benefit of primary tumor resection (PTR) for gastric cancer with liver metastasis.

Survival benefit of primary tumor resection for gastric cancer with liver metastasis: A propensity score-matched, population-based study.

Functional depletion of the U1 small nuclear ribonucleoprotein (snRNP) with a 25 nt U1 AMO (antisense morpholino oligonucleotide) may lead to intronic premature cleavage and polyadenylation of thousands of genes, a phenomenon known as U1 snRNP telescripting; however, the underlying mechanism remains elusive. In this study, we demonstrated that U1 AMO could disrupt U1 snRNP structure both in vitro and in vivo, thereby affecting the U1 snRNP-RNAP polymerase II interaction. By performing chromatin immunoprecipitation sequencing for phosphorylation of Ser2 and Ser5 of the C-terminal domain of RPB1, the largest subunit of RNAP polymerase II, we showed that transcription elongation was disturbed upon U1 AMO treatment, with a particular high phosphorylation of Ser2 signal at intronic cryptic polyadenylation sites (PASs). In addition, we showed that core 3'processing factors CPSF/CstF are involved in the processing of intronic cryptic PAS. Their recruitment accumulated toward cryptic PASs upon U1 AMO treatment, as indicated by chromatin immunoprecipitation sequencing and individual-nucleotide resolution CrossLinking and ImmunoPrecipitation sequencing analysis. Conclusively, our data suggest that disruption of U1 snRNP structure mediated by U1 AMO provides a key for understanding the U1 telescripting mechanism.

The U1 antisense morpholino oligonucleotide (AMO) disrupts U1 snRNP structure to promote intronic PCPA modification of pre-mRNAs.

The essential role of U4 snRNP in pre-messenger RNA (mRNA) splicing has been well established. In this study, we utilized an antisense morpholino oligonucleotide (AMO) specifically targeting U4 snRNA to achieve functional knockdown of U4 snRNP in HeLa cells. Our results showed that this knockdown resulted in global intronic premature cleavage and polyadenylation (PCPA) events, comparable to the effects observed with U1 AMO treatment, as demonstrated by mRNA 3'-seq analysis. Furthermore, our study suggested that this may be a common phenomenon in both human and mouse cell lines. Additionally, we showed that U4 AMO treatment disrupted transcription elongation, as evidenced by chromatin immunoprecipitation sequencing (ChIP-seq) analysis for RNAPII. Collectively, our results identified a unique role for U4 snRNP in the inhibition of PCPA and indicated a model wherein splicing intrinsically inhibits intronic cleavage and polyadenylation in the context of cotranscriptional mRNA processing.

Zejin Lin

Sun Yat-sen University

Application of Mid-Pancreatectomy with End-to-End Anastomosis in Pancreatic Benign Tumors

Application of Robot-assisted Pancreaticobiliary Junction Resection in Benign Duodenal Tumors