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arXiv 2202.01672cs.LGq-bio.QM
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SubOmiEmbed:用于癌症类型分类的多组学数据的自监督表示学习

SubOmiEmbed: Self-supervised Representation Learning of Multi-omics Data for Cancer Type Classification

Mohamed Bin Zayed University of Artificial Intelligence(穆罕默德·本·扎耶德人工智能大学)

Sayed Hashim, Muhammad Ali, Karthik Nandakumar, Mohammad Yaqub

摘要:

对于个性化药物,非常关键的内在信息存在于高维组学数据中,由于大量的分子特征和少量的可用样本,这些数据很难捕获。不同类型的组学数据显示样本的各个方面。多组学数据的整合和分析为我们提供了肿瘤的广阔视野,这可以改善临床决策。组学数据,主要是DNA甲基化和基因表达谱,通常是具有大量分子特征的高维数据。近年来,变分自编码器(VAE)已被广泛用于将图像和文本数据嵌入到低维潜空间中。在我们的项目中,我们扩展了使用VAE模型的低维潜在空间提取的自监督学习技术的特征子集的想法。VAE的关键思想是让模型从不同类型的组学数据中学习有意义的表示,然后可以用于癌症类型分类等下游任务。其主要目标是克服维数灾难,整合甲基化和表达数据,以结合相同组织样本不同方面的信息,并有望提取生物相关特征。我们的扩展包括训练编码器和解码器从数据的一个子集重建数据。通过这样做,我们迫使模型在潜在表示中编码最重要的信息。我们还为子集添加了一个标识,以便模型在训练和测试期间知道哪个子集正在被输入。我们对我们的方法进行了实验,发现SubOmiEmbed产生的结果与基线OmiEmbed相当,网络要小得多,而且只使用数据的一个子集。这项工作也可以改进以整合基于突变的基因组数据。

英文摘要:

For personalized medicines, very crucial intrinsic information is present in high dimensional omics data which is difficult to capture due to the large number of molecular features and small number of available samples. Different types of omics data show various aspects of samples. Integration and analysis of multi-omics data give us a broad view of tumours, which can improve clinical decision making. Omics data, mainly DNA methylation and gene expression profiles are usually high dimensional data with a lot of molecular features. In recent years, variational autoencoders (VAE) have been extensively used in embedding image and text data into lower dimensional latent spaces. In our project, we extend the idea of using a VAE model for low dimensional latent space extraction with the self-supervised learning technique of feature subsetting. With VAEs, the key idea is to make the model learn meaningful representations from different types of omics data, which could then be used for downstream tasks such as cancer type classification. The main goals are to overcome the curse of dimensionality and integrate methylation and expression data to combine information about different aspects of same tissue samples, and hopefully extract biologically relevant features. Our extension involves training encoder and decoder to reconstruct the data from just a subset of it. By doing this, we force the model to encode most important information in the latent representation. We also added an identity to the subsets so that the model knows which subset is being fed into it during training and testing. We experimented with our approach and found that SubOmiEmbed produces comparable results to the baseline OmiEmbed with a much smaller network and by using just a subset of the data. This work can be improved to integrate mutation-based genomic data as well.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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