redeconv 1.0.5

One wildly used method for scRNA-seq data normalization is to make the total count, called the transcriptome size, of all genes in each cell to be the same, such as counts per million (CPM) or count per 10 thousand (CP10K)

ReDeconv

ReDeconv presents an innovative approach for deconvolving cell types in bulk RNA-seq data, utilizing single-cell RNA-seq or bulk sort RNA-seq data as a reference. The ReDeconv methodology comprises two primary elements. The first part involves the normalization of scRNA-seq data. The second part encompasses calculating the signature gene matrix and determining the proportions of varying cell types within mixed samples, using bulk RNA-seq data.

ReDeconv Workflow

Major contributions of ReDeconv

In ReDeconv, we mainly have following contributions to address some critical issues in cell type deconvolution:

• Address the issues of sequencing-depth normalization (Type-I issues).
• Address the issues of gene-length normalization (Type-II issues).
• A new way to find signature genes (Type-III issues).
• A new model for cell type deconvolution (Type-III issues).

When conducting deconvolution, certain issues may go unnoticed for a while since the authentic bulk RNA-seq data typically lacks a ground truth, and the synthetic bulk RNA-seq data does not necessarily exhibit these issues. For instance, if the synthetic bulk RNA-seq data is derived from CPM/CP10K scRNA-seq data, which is also used as a reference, we might not encounter Type-I and Type-II issues. However, in such situations, the transcriptome size - the total count of all genes in a cell - remains constant for each cell in the synthetic bulk. This scenario is generally not applicable to real-world bulk RNA-seq data.

When using different deconvolution methods, including certain high-ranking ones, issues can arise due to improper normalization of scRNA-seq and/or bulk RNA-seq data. For instance, applying Counts Per Million (CPM) to reference scRNA-seq data can lead to a deconvolution issue where the transcriptome sizes of cells in the references are uniform, but vary in the actual bulk RNA-seq data (termed as Type-I issues). Moreover, if we use raw-count scRNA-seq data, which doesn't account for gene length, along with raw-count total RNA-seq data, which does, it results in a discrepancy in gene length normalization (defined as Type-II issues). These Type-II issues can occur when applying such data to various deconvolution methods, including the top ones. Additionally, using CPM scRNA-seq and bulk RNA-seq data as inputs for deconvolution can result in both Type-I and Type-II issues. We've adjusted our new cell type deconvolution model, ReDeconv, to include versions with Type-I issues (ReDeconv (I)), Type-II issues (ReDeconv (II)), or both (ReDeconv (I, II)). The outcomes show that predictions from ReDeconv (free from Type-I and Type-II issues) have a very low relative error, while those from the modified ReDeconv with these issues have a significantly higher relative error. In addition to tackling Type-I and Type-II issues, ReDeconv also includes other enhancements that significantly boost deconvolution performance. More about our contributions can be found in the Documentation.

How to install/start ReDeconv

[1] Windows Desktop Application

Download *.exe files to a local fold in a Windows system. Run “ReDeconv_Normalization.exe” for the scRNA-seq data normalization and “ReDeconv_Percentage.exe” for cell type deconvolution.

• ReDeconv_Normalization_GUI.exe
• ReDeconv_Percentage_GUI.exe

Note: You may need about one minute to load and start the program.

[2] by PyPI with conda (conda is optional, but recommended)

conda create -n redeconv python=3.8
conda activate redeconv
pip install redeconv

then in your Python script or interactive environment, import the package

from redeconv.__ReDeconv_N import *
from redeconv.__ReDeconv_P import *

[3] by source codes with conda (conda is optional, but recommended)

conda create -n redeconv python=3.8
conda activate redeconv
git clone https://github.com/jyyulab/redeconv.git
cd redeconv
python setup.py install

then in your Python script or interactive environment, import the package

from redeconv.__ReDeconv_N import *
from redeconv.__ReDeconv_P import *

[4] Web Portal

The web portal is a specially designed web application that often serves as the single point of access for ReDeconv.

Sign in at redeconv.stjude.org

Demo data

These data sets include demo data for normalization and deconvolution. The sizes of files in the demo data are not very large. So, the time to test our model should be finished within 20 minutes.

Data for ReDeconv evaluation

We provide all scRNA-seq, synthetic bulk RNA-seq, and real bulk RNA-seq data that were used to evaluate ReDeconv, which is suppressed into a .zip file. The excel file in the .zip file includes information about the data source and ground truth of the synthetic bulk RNA-seq data.

Funding Information

This work was supported in part by National Institutes of Health grants R01GM134382, U01CA264610, and U01CA281868 and by the American Lebanese Syrian Associated Charities.

Contact

Please contact Songjian Lu (Songjian.Lu stjude.org) for any problems related to model, algorithm, GUI version and the python package for ReDeconv. Please contact Lei Yan (Lei.Yan stjude.org) for any problems related to the web portal of ReDeconv.