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2026-06-29
  • Research Findings
  • Institute of Biological Chemistry
How do cancer-related mutations disrupt the function of tumor suppressor proteins?

A research team led by Professor Shang-Te Danny Hsu at the Institute of Biological Chemistry, Academia Sinica, combined advanced methyl NMR, protein dynamics analysis, and molecular simulations to map, for the first time, the long-range allosteric regulatory network inside the important tumor suppressor protein BAP1 and to systematically examine the molecular effects of nearly 50 cancer-related mutations. BAP1 is closely linked to several cancers, including mesothelioma, uveal melanoma, and renal cell carcinoma, and its core structure has a rare deeply knotted fold. The team found that an amino acid in the protein core, L49, acts as a key hub for coordinating internal communication. Even a mutation that shortens its side chain by just one carbon atom can disrupt the dynamic coupling between different parts of the protein, causing its deubiquitinase activity to be lost. Further analysis showed that many cancer mutations found in patients are far from the active site, yet they can still affect protein stability and function by disturbing this regulatory network. This study provides one of the most comprehensive structure-function maps of BAP1 cancer mutations to date, offering an important molecular basis for understanding how BAP1-related cancers develop and highlighting the unique power of advanced NMR techniques for revealing protein dynamics and disease mechanisms.

2026-04-27
  • Research Findings
  • Institute of Cellular and Organismic Biology
Genome of Asymmetron lucayanum illuminates cephalochordate evolution and vertebrate origins

Cephalochordates, commonly known as amphioxus or lancelets, are widely utilized by the scientific community as model organisms to investigate the ancestral traits of vertebrates. An international research team—including Research Fellow Jr-Kai Yu and Postdoctoral Fellow Che-Yi Lin from the Institute of Cellular and Organismic Biology at Academia Sinica, together with researchers from the USA, South Korea, and China— has sequenced the chromosome-scale genome of Asymmetron lucayanum, a tiny marine animal representing the earliest branch of the cephalochordate lineage. This new genome assembly provides a crucial link in understanding the evolutionary transition from simple invertebrates to complex vertebrates, including humans. Comparative genomic analysis reveals that the Asymmetron genome is significantly larger than those of species within the genus Branchiostoma, which have been the primary focus of previous amphioxus research. The team discovered that this genome expansion was driven by the massive accumulation of "jumping genes" (transposable elements). Remarkably, despite the presence of this extra DNA, the researchers found that the overall gene order—or macro-synteny—has remained incredibly intact over hundreds of millions of years. This stability is likely maintained by selective constraints, potentially due to the necessity for these genes to be co-expressed during development.

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