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江苏省农科院兽医所/南京农大谢青云,冯志新等:猪肺炎支原体基因组学研究进展

  • 2026-07-15 20:33:29
江苏省农科院兽医所/南京农大谢青云,冯志新等:猪肺炎支原体基因组学研究进展

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《畜牧兽医学报》2026年第57卷第6期刊登了江苏省农业科学院兽医研究所等单位彭康尧,韦艳娜,于岩飞,谢青云,冯志新的文章——“猪肺炎支原体基因组学研究进展”,该文由国家自然科学基金(32202812)资助。该综述的亮点:首次系统整合20株猪肺炎支原体全基因组完成图信息,通过共线性分析揭示其核心基因组保守与局部结构可塑性并存的进化特征,并分类解析毒力、复制、分泌、免疫逃避及能量代谢等关键功能基因,为挖掘新型药物靶点、疫苗候选抗原及制定精准流行病学防控策略提供了全基因组水平的理论依据。

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猪肺炎支原体基因组学研究进展

导读

前言

猪支原体肺炎是由猪肺炎支原体引起的慢性接触性呼吸道传染病,发病率高、感染面广,给养猪产业造成严重经济损失。现有疫苗虽可减轻临床症状,但无法有效阻断病原的持续定植与传播。基因组学研究为揭示其致病机制、筛选关键靶标、开发新型疫苗和诊断技术提供了重要工具。

1 猪肺炎支原体基因组结构特征

基因组大小800~1 000 kb,G+C含量28%~30%,编码约700个基因,约为大肠杆菌的1/5~1/4。缺乏细胞壁,生物合成和代谢能力有限。约26.3%基因集中于黏附、毒力和免疫逃避相关基因家族;约40%编码序列为功能未知蛋白(PUFs),其中酶类占比最高。简单序列重复序列(SSR)广泛存在,增强种群多样性,有助于免疫逃避。

2 猪肺炎支原体比较基因组学分析

2.1 全基因组序列基本信息

已公布20株全基因组完成图,包括经典参考株J株、疫苗株168-L和ES-2L、近年新分离株等。J株:首个分离株,897 kb,国际最经典参考株,商业灭活疫苗核心种子毒株;168-L株:国内活疫苗"支必宁"株,较亲本株168少4 483 bp,103个Indels和227个SNVs;ES-2L株:新型活疫苗候选株,较亲本ES-2存在18个基因缺失,11个位于PUFs。

2.2 基因组共线性分析

核心基因组相对保守,但局部区域存在广泛的染色体倒位和易位。国内分离株与参考株存在不同程度的结构变异。约2 2 kb基因片段在168株和LH株中稳定存在,提示较长时期的遗传保守性。KM014株存在大规模倒位和易位,为目前未见报道的独特特征。基因组可塑性是专性寄生菌适应宿主环境的遗传基础。

3 猪肺炎支原体关键功能基因分析

3.1 毒力相关基因

黏附蛋白:P97(含R1/R2纤毛结合域)、P159(水解为P27/P110/P52)、P216(缺乏R1的纤毛黏附蛋白)、P146(富含丝氨酸,可用于基因分型)。入侵机制:P102结合激活纤溶酶、Mhp390捕获纤溶酶原。免疫靶标:P46(高免疫原性,诊断理想靶标)、P65(酯酶活性,亚单位疫苗潜在靶点)。

3.2 复制相关基因

复制起始点oriC围绕dnaA基因组织,A/T富集区。最小oriC区域包含dnaA上下游DnaA盒,dnaA基因本身编码序列非必需。

3.3 蛋白质分泌相关基因

缺乏经典III型、IV型分泌系统。主要依赖Sec途径(SecA、SecYEG、SPR、SecD/F)。Tat途径核心蛋白缺失TatB,活性证据不足。19%蛋白经经典Sec途径分泌,44%为非经典分泌,存在细胞外囊泡介导途径。

3.4 免疫逃避相关基因

突破物理屏障:黏附蛋白竞争性结合肝素削弱黏膜清除;MnuA和Mhp597核酸酶降解NETs;干扰体液免疫:MIB-MIP系统切割宿主抗体;EF-Tu结合H因子干扰补体活化;Mhp271抑制PBD-2表达;诱导细胞凋亡:NFOR和NOX引发氧化应激;Mhp390/P68诱导PBMCs和PAMs凋亡,促进IL-1β和TNF-α释放。

3.5 能量代谢相关基因

缺乏完整三羧酸循环,主要依赖糖酵解。兼职蛋白策略:GAPDH参与毒力调控;Eno作为纤溶酶原受体促进组织侵袭;核苷酸获取通路:Mhp597/MnuA/Mhp379降解NETs,ABC转运系统攫取核苷酸前体;肌醇代谢通路非必需,为潜在减毒活苗靶点;甘油代谢:额外拥有glpK基因,更有效利用甘油产生过氧化氢加剧组织损伤。

4 猪肺炎支原体基因组分型揭示流行病学特征

MLVA分型:全球高度遗传变异,无共同VNTR类型跨国分布;MLST分型:中国菌株均为新序列型,属独特本土基因型;ST128型同时存在于江苏和广西,揭示生猪调运为跨区域传播风险因素;WGS分析:西藏株TB1在能量代谢和毒力基因方面存在显著差异,体现高原适应性进化。封闭猪群中菌株持续传播至少两年,同一猪群遗传同质性更高。遗传多样性与肺部病变程度相关;近半数加拿大田间株与疫苗株遗传同源性低于55%。

5 小结

猪肺炎支原体基因组呈现显著的精简性、缺乏细胞壁合成基因、富含黏附毒力基因及多个高变区。核心基因组保守但存在基因家族多态性和毒力因子多样性。目前约40%假定蛋白功能未明,随着基因组数据积累和人工智能技术应用,功能注释有望逐步完善。系统解析基因组多样性特征对深入理解流行病学规律、致病机制及优化防控策略具有重要意义。

关键词:猪肺炎支原体;基因组;功能

引用本文

彭康尧, 韦艳娜, 于岩飞, 谢青云, 冯志新. 猪肺炎支原体基因组学研究进展[J]. 畜牧兽医学报, 2026, 57(6): 3103-3113 doi:10.11843/j.issn.0366-6964.2026.06.011

PENG Kangyao, WEI Yanna, YU Yanfei, XIE Qingyun, FENG Zhixin. Advances in Mycoplasma hyopneumoniae Genomics[J]. Acta Veterinaria et Zootechnica Sinica, 2026, 57(6): 3103-3113 doi:10.11843/j.issn.0366-6964.2026.06.011

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  1. CONNECT:[ UseTime:0.000538s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000687s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.014554s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003485s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000599s ]
  6. SELECT * FROM `set` [ RunTime:0.009436s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000961s ]
  8. SELECT * FROM `article` WHERE `id` = 598660 LIMIT 1 [ RunTime:0.002567s ]
  9. UPDATE `article` SET `lasttime` = 1784154173 WHERE `id` = 598660 [ RunTime:0.012634s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.002929s ]
  11. SELECT * FROM `article` WHERE `id` < 598660 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.011650s ]
  12. SELECT * FROM `article` WHERE `id` > 598660 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007748s ]
  13. SELECT * FROM `article` WHERE `id` < 598660 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003929s ]
  14. SELECT * FROM `article` WHERE `id` < 598660 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008894s ]
  15. SELECT * FROM `article` WHERE `id` < 598660 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009778s ]
0.165299s