通过遗传学推断预测潜在的PRRSV-2变体的出现.
Nakarin Pamornchainavakul1, Mariana Kikuti1, Igor A D Paploski1
1College of Veterinary Medicine, University of Minnesota, St. Paul, MN, USA.
Transboundary and emerging diseases
|April 30, 2025
概括
预测新的猪生殖和呼吸系统综合征病毒2型 (PRRSV-2) 变种对于疾病控制至关重要. 这项研究确定了PRRSV-2出现的遗传学指标,有助于未来的预防策略.
科学领域:
- 兽医病毒学 兽医病毒学
- 分子流行病学分子流行病学
- 疾病预测建模模型
背景情况:
- 猪生殖和呼吸系统综合征 (PRRS) 在美国猪肉行业造成重大经济损失,每年超过5亿美元.
- 猪生殖和呼吸系统综合征病毒2型 (PRRSV-2) 的基因多样性菌株的出现使疾病控制和疫苗开发复杂化.
- 尽管有可用的数据,但对其他疾病成功的新兴病毒变异的预测工具对于PRRSV-2缺乏.
研究的目的:
- 确定基于遗传学的早期指标,用于预测短期 (12个月) 和长期 (24个月) 的PRRSV-2变种的出现.
- 为了分析PRRSV-2血统1,主要的美国血统,使用十年的ORF5序列数据.
- 评估人口扩张,空间分布和遗传多样性作为变种出现的关键指标.
主要方法:
- 分析了20700个PRRSV-2ORF5序列和过去十年的相关元数据.
- 遗传学分析以确定变种出现的指标.
- 条件后勤回归用于评估人口扩张,空间分布和遗传多样性指标的预测能力.
主要成果:
- 成功的PRRSV-2变种呈现出人口扩张和广泛的地理分布,遗传多样化有限.
- 当地分支指数预测了人口扩张 (BA=0.75),而祖先分支长度预测了遗传多样性 (BA=0.79).
- 分枝长度和假设的抗原差异预测了空间分散 (BA=0.67);模型捕获了58-81%的变体,但具有较低的PPV (9-16%).
结论:
- 遗传学指标可以为PRRSV-2变种的出现提供早期警告.
- 预测模型在识别潜在的未来变异方面表现有希望,有助于积极的疾病管理.
- 这项研究是制定精确的PRRSV-2预防策略的关键第一步.
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