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利用基因组信息预测
复杂性状的表型
答辩人:AAA
指导老师:BBB
汇报时间:CC年CC月CC日
目录
研究背景01
研究方法02
研究成果03
讨论与展望04
研究背景01
全基因组关联分析(Genome-wide
association study)
是指在人类全基因组范围内找出存在
的序列变异,即单核苷酸多态性
(SNP),从中筛选出与疾病相关的
SNPs。
遗传力缺失(Missing Heritability)
单个或多个地,大多数常见的变异贡
献相对较小的遗传力(1.1-1.5倍)
创新点
01
02
表型预测
表型
充分统计当特征相关的标记捕捉到全
部加性遗传方差时,仅用预
测表型与实际表型的平方相
关性即可计算遗传力
利用个体数据的均值,方差
和相关性,可避免个人隐私
问题,获得多平台数据
预测 寿命
双胞胎实验:基因解释了人类寿命中20% -30%的变异
选型交配导致对19世纪和20世纪初出生群体的人类寿命
的普遍高估,而真正的遗传力可能远低于
10%
表型预测寿命的优势:
1. 确定遗传力的大致范围
2. 了解寿命风险对提高公众健康意识和提供更好
的疾病预防、诊断和治疗具有重要意义。
01
02
个体数据:
499838 individual-level data including 442678 White and
57160 Non-white British European from UK Biobank
03
研究材料
总结数据:
442678 White British European summary-level data from UK
Biobank round 2 GWAS by Ben Neale’s lab.
分析工具:
R version 3.5.3
Step 1 Step 2 Step 3 Step 4
数据收集与
整理
交叉验证 样本外验证
a
b
c
d
a b c d
使用LASSO
回归筛选与
寿命相关的
表型
02 研究方法
图一 图二
图一:在不同模型下,当父亲死亡年龄的预测因子数量增加时,样本外累积R方的表现
图二:在不同模型下,当母亲死亡年龄的预测因子数量增加时,样本外累积R方的表现
交叉验证结果
平均线
平均线
样本外验证结果
图一 图二
图一:描述了利用14个预测因子通过样本内累积R方(蓝色线)和样本外积累R方(紫色线)预
测父亲死亡年龄的预测效果
图二:描述了利用14个预测因子通过样本内累积R方(蓝色线)和样本外积累R方(紫色线)预
测母亲死亡年龄的预测效果
2.6% 3.9%
网站展示
输入关键词
网址: http://47.115.38.191/#/phenopredict
网站展示
填写相关信息
提交
表型的过简化
缺失值的处理
表型的选择
样本量增加
表型形式增加
采用更精确的机器学习方法选择表型
04 讨论与展望
谢谢观看与聆听
Thank you for your listening!

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Thesis Defenses Presentation

Editor's Notes

  1. 狭义遗传力 是指表型方差(Vp)中加性方差(VA)所占的比率 表型 是指个体观察到的某些特征 我们知道,GWAS 是指在全基因组上筛选出与疾病或其他复杂性状相关的SNP,这在单基因遗传上取得有效成果,但当被应用到复杂性状时,我们会遇到遗传力缺失问题,也就是单个或很多个变异仅贡献较小的遗传力,大多数遗传力没有被解释到。这个问题有很多解释,主流的说法是
  2. 因此,为了更好
  3. 了解表型风险对提高公众健康意识和提供更好的疾病预防、诊断和治疗具有重要意义。