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Chunk #84 — Methods — Genetic control of ancestry effects on expression — Calculating predicted expression using genetic variants in a linear model

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Analysis of gene expression in the postmortem brain of neurotypical Black Americans reveals contributions of genetic ancestry.
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For our linear model, we extracted the posterior effect size of the top genetic variant from the mash model for each feature (gene, transcript, exon and junction). We imputed residualized expression using an individual’s genotype dosage (j) and feature (i) posterior effect size (equation (9)) using PyTorch (v.1.11.0+cu113)98:9\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathrm{Predicted}}\,{\mathrm{expression}}_{i}={{\mathrm{effect}}\,{\mathrm{size}}\,{({\mathrm{eQTL}})}_{j} \times{\mathrm{genotype}}}_{j}$$\end{document}Predictedexpressioni=effectsize(eQTL)j×genotypej