科學家發現非洲睡眠病寄生蟲如何躲避免疫系統
Scientists discover how African sleeping sickness parasite hides from the immune system
研究人員針對非洲昏睡病（sleeping sickness）的病原體——布氏錐蟲（Trypanosoma brucei），取得了重大突破。
Researchers have made a major breakthrough regarding the Trypanosoma brucei, the pathogen behind African sleeping sickness.
數十年來，科學家一直困惑於這種寄生蟲（parasite）是如何在保持必要的輔助蛋白處於低水平的同時，製造出大量保護性的變異表面糖蛋白（VSG）外殼。
For decades, scientists wondered how the parasite produces a massive protective coat of Variant Surface Glycoprotein (VSG)[noun|protein] while keeping essential helper proteins at low levels.
發表於《自然-微生物學》（Nature Microbiology）的一項研究確認了一種稱為ESB2的蛋白質，其作用如同分子碎紙機。
A study published in Nature Microbiology identifies a protein called ESB2 that acts as a molecular shredder.
ESB2位於寄生蟲體內，透過破壞輔助基因轉錄本（transcripts），同時保持VSG指令完好無損來執行即時基因編輯。
Located inside the parasite, ESB2 performs real-time genetic editing by destroying helper gene transcripts while keeping the VSG instructions intact.
由采采蠅（tsetse fly）傳播的非洲昏睡病是一種危險的熱帶疾病，會侵襲中樞神經系統。
African sleeping sickness, transmitted by the tsetse fly, is a dangerous tropical disease that can invade the central nervous system.
透過掌握抗原變異（antigenic variation），寄生蟲會不斷切換其表面外殼，以規避宿主的免疫系統。
By mastering antigenic variation, the parasite constantly switches its surface coat to evade the host's immune system.
揭開這種生物弱點，為治療這種嚴重疾病提供了充滿前景的新方向，該病至今仍是撒哈拉以南非洲地區健康的重大威脅。
Uncovering this biological vulnerability offers a promising new direction for developing treatments against this severe illness, which remains a significant threat to health in sub-Saharan Africa.
