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On this page
  • Import Illumina methylation array data
  • Assign sample metadata
  • Generate beta value
  • Generate PCA
  • Detect differential methylation
  • Visualize filtered results with Hierarchical clustering / heatmap
  • Perform biological interpretation
  • Filter the Gene set enrichment result
  • Analyses pipeline for Infinium methylation array data analysis
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  1. Partek Flow
  2. Tutorials

Analyzing Illumina Infinium Methylation array data

PreviousAnalyzing Single Cell ATAC-Seq dataNextNanoString CosMx Tutorial

Last updated 3 months ago

This guide provides instructions for analyzing Illumina Infinium Methylation array data.

The tutorial uses this if following along exactly with the analyses pipeline.

If you are new to Partek Flow, please see the for information about the Partek Flow user interface.

Import Illumina methylation array data

We recommend uploading the microarray data to a folder on your Partek Flow server before importing into a project. Data files can be transferred to your server from the Home page by clicking the Transfer file button. Users have the option to change the Upload directory by clicking the Browse button and either select another existing directory or create a new directory. .

To create a new project on the Home page click the +Add data button, enter a project name, and click Create project.

Select Microarray, Methylation and Illumina methylation idat as the file format for import then click Next.

Navigate to the idat files that have been uploaded to the server. For this tutorial, there are two paired idat files per sample.

If you have not already transferred the files to the server you can choose to do this within the import task by clicking the Transfer files to the server button.

This will bring you to the Transfer files page. Click the Transfer files button, add the files for transfer then click Upload. Do not terminate the browser or let your computer go to sleep during transfer. A time estimate for upload is provided but may change.

When the transfer completes the upload window will close. In the Transfer files page, the transferred files Status is Complete.

Now, the selected files are on the server in the folder specified during transfer.

In the project import task, navigate to the files on your server. In the example below, only these files were saved to this folder so I will check the top box to select all then click Finish.

This starts the Importing of selected data to the project. The transparent task bar will complete as import progresses.

When the import completes, the Microarray methylation data node appears in the Analyses tab. Hovering of this node, we see 60 samples (572.28 MB data) are contained in this data node.

Assign sample metadata

Add sample metadata to the project by navigating to the Metadata tab. Select the Assign values from file button as an efficient way to assign sample attributes using a tab delimited text file.

If the samples metadata file is not already on the server, click Transfer files to the server.

Select the file then click Next.

The tab delimited file should contain a table with the following:

  • The first column of the table lists the sample names (the sample names in the file must be identical to the ones listed in the project Sample name column in the Metadata tab)

  • The first row lists the attribute names (e.g. Treatment, Exposure)

  • List any corresponding attributes for each sample in succeeding columns

Make any wanted modifications and click Import.

This adds the defined attribute information to the Metadata tab. Manage and Assign values buttons can be used to further modify sample attributes.

Click the left Analyses tab to navigate back to the analyses pipeline.

Single-click the Microarray methylation data node to run the first task using the context sensitive menu on the right. No tasks have been performed on this data so there is still an option to Add data to the project; once analysis tasks are performed from this data node, data can no longer be added to the project.

Generate beta value

Using the task menu on the right under Methylation analysis select the Generate beta value task.

Choose the Chip name as Infinium Methylation Screening Array, If the Chip name is not listed use the dropdown to select New Chip then add the Illumina manifest file.

Keep the default settings and click Finish.

This task output is the Methylation beta data node. Methylation Beta-values are continuous variables between 0 and 1.

Single-click the Methylation beta data node node and choose the next PCA task under Exploratory analysis from the task menu.

Generate PCA

In the Analyses tab, select the Methylation beta data node then use the task menu Exploratory analyses options to run the PCA task . Keep the default settings the same and click Finish.

In the Analyses tab, double click the PCA data node (circle) or single click the data node and select Task report under Task results in the task menu to view the PCA results in the Data Viewer.

Detect differential methylation

Single-click the Methylation beta data node node and perform the Detect differential methylation task under Methylation analysis in the task menu.

Follow along with the task to make one-way or two-way ANOVA comparisons. The configured ANOVA model is performed on both Beta-value and M-value matrices. Click Finish.

This outputs the Detect differential methylation task report list. Open the Task report from the task menu or double-click the data node.

The outputs of this task include significance as P-value and FDR step up which is from the M-values. The LSMeans of the groups and the Difference are of the Beta-values.

Use the left filter panel to filter the results then click Generate filtered node.

The filtered node is now available in the Analyses pipeline.

Visualize filtered results with Hierarchical clustering / heatmap

Select the generated Filtered feature list data node and use the Exploratory analysis task menu dropdown to perform the Hierarchical clustering / heatmap task.

In the Hierarchical clustering / heatmap task settings, change Sample order to Assign order, select the attribute, then click Finish. This will order the heatmap rows based on the attribute order assigned.

Completion of this task will output the Hierarchical clustering / heatmap task results. Double-click this node or select Task report under Task results from the task menu to open the results in the Data viewer.

The heatmap visualization can be altered within the Data viewer using both the left menu and the in-plot controls.

Click Save as in the left menu to save the data viewer session to return and make changes.

Perform biological interpretation

Select the Filtered feature list data node within the Analyses tab and choose the Gene set enrichment task under Biological interpretation in the task menu.

Use the Gene set enrichment task settings to change default parameters.

Choose the KEGG database. Click the dropdown to change the selection; select New library to add the most recent library available.

Check Select feature identifier as Gene Symbol or Gene IDs to ensure genes are used instead of probe IDs for this task.

After optimizing the task settings, click Finish.

The output of the Gene set enrichment task node is the Pathway enrichment data node.

Filter the Gene set enrichment result

Filter the KEGG pathway gene sets by selecting the Pathway enrichment data node then clicking the Filter gene sets task from the task menu.

Modify the Filter by parameters to include P-value < 0.050 then click Finish.

Completion of this task will output a Filter gene sets task node and a Filtered list data node in the Analyses tab. Open the filtered gene sets by selecting the Filtered list data node and clicking the task menu Task report from the right task menu.

Because we filtered the gene sets to fewer than 100 rows, click the button to View plots in the Data Viewer. The filtering step can also be performed within the Pathway enrichment report.

This opens the filtered list report in the Data viewer for further modification.

Save this data viewer session, with a meaningful name to revisit for future analysis, using the Save as button in the left menu.

This saved session is accessible by selecting the project Data viewer tab or by clicking Data Viewer within the breadcrumb (shown above the Data viewer canvas).

Analyses pipeline for Infinium methylation array data analysis

This completes the example analyses pipeline.

Upon project creation you will land in the Analyses tab, prompting the addition of sample data to the project. Click the blue Add data button

When available, hover over Tooltips or click the video help for decision making.

This task converts the Beta-values to M-values and uses these to perform ANOVA differential expression analysis.

Click the Optional columns button to add more column data including annotation from the Illumina manifest file. For more information on these optional columns

To save the full individual image within the Data viewer to your machine, click the in-plot Export image icon in the top right corner of the image, choose All data then select the format, size, and resolution and click Save.

task like the interactive KEGG pathway maps.

Please click here for more information on the ANOVA model.
please see the "Infinium Methylation Screening Array Manifest Column Headings pdf here.
Click here for more information on Hierarchical clustering task settings to visualize a Heatmap or Bubble map
Please click here for more information on using the Data viewer to modify visualizations.
Please click here for more information on using the Data viewer to modify visualizations.
Please click here for more information on the Gene set enrichment
Infinium Methylation Screening Array Demo Data Set
Quick start guide
Please click here for more information on transferring files to the server
Give the project a name then click Create project
Add data to the project by clicking Add data (blue circle)
Choose Microarray, Methylation, and Illumina methylation idat then click Next
Transfer idat files to the server by clicking Transfer files to the server
Transfer the files to the server where you can find them
The Transfer files page shows the idat file transfer is complete
Select the paired idat sample files for import into the project
Importing the data to the project
The Microarray methylation data node contains the imported data, hover over the node to see details
Add sample metadata in the Metadata tab
Transfer the file to the server
Add sample attributes from a file
Manage and Assign values in the Metadata tab to further modify sample attributes
Run the first task on the Microarray methylation data node using the context sensitive menu on the right
Choose the appropriate manifest file (Chip name), keep the default settings then click Finish
Perform PCA task
Que the PCA task with default settings and click Finish
PCA task results in the Data Viewer
Select the Methylation beta data node then que the Detect differential methylation task
Open the Detect differential methylation report
Use the filter panel to filter the results then click Generate filtered node
Modify the heatmap task settings and click Finish
Open the Hierarchical clustering / heatmap task results
Modify the task results using the Data viewer controls
Save the heatmap to your machine by selecting All data
Run the Gene set enrichment task on the filtered feature list data node
Optimize the settings for the Gene set enrichment task
Select the Pathway enrichment and click the Filter gene sets task
Modify the Filter by parameters to include P-value < 0.050 and click Finish
Open the filtered gene sets by double clicking on the Filtered list data node
Filtering to fewer than 100 rows allows the View plots in the Data Viewer button
Filtered list of KEGG pathway results in the Data viewer
Analyses pipeline for Infinium methylation array