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Old 09-07-2015, 08:02 PM   #1
Location: Hong Kong

Join Date: Oct 2011
Posts: 46
Default Duplication rate for whole genome bisulfite sequencing

Hi folks,

For WGBS, we've experienced with human gDNA using Illumina EpiGnome/TruSeq DNA Methylation kit and HiSeq sequencing.

The sequencing duplication rate is dynamic, from <5% to >20%; the more sequencing output we request, the higher duplication rate we get. Is it normal to get 5%-20% of duplication rate?

Can you share your experience on WGBS, which kit you've tried, how much sequencing depth you've requested and how much duplication rate you've got?

Besides, have you seen such "dynamic" duplication rate with different sequencing output?


Last edited by weigrc; 09-07-2015 at 08:04 PM.
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Old 09-07-2015, 09:18 PM   #2
Jafar Jabbari
Location: Melbourne

Join Date: Jan 2013
Posts: 1,238

In any PCR amplified library increasing sequencing depth will increase duplication rate as the diversity (# of unique fragments) is limited and sequencing more fragments will result in reads originating from the same initial fragment.
What you see is normal and I have seen around 10% dup rate using the same kit when around 40M reads/library was obtained. The rate was similar between bisulphite converted and non-converted libraries indicating the limits of kit and chemistry employed.
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Old 09-09-2015, 10:54 AM   #3
Location: uk

Join Date: Mar 2009
Posts: 34

As an additional note to the previous answer, the duplicate rate will increase the deeper you sequence a given sample.

The curve of total reads and total distinct reads will depend on the diversity, as depicted here:

There are ways to improve the duplicate rate of WGBS by using more recent commercial conversion kits from other vendors, generally categorized as post-BS kits.

Last edited by avilella; 09-13-2015 at 03:19 AM.
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Old 09-16-2015, 05:52 PM   #4
Location: Hong Kong

Join Date: Oct 2011
Posts: 46

Dear Nucacidhunter and Avilella,

Thanks for your information. They help!!

BTW, rather than EpiGenome and TruSeq DNA Methylation kits, I read there is a new kit for methylation study as Accel-NGSŪ Methyl-Seq DNA Library Kit, which claims a better performance than former two kits. Has anyone tried out yet?

Accel-NGSŪ Methyl-Seq DNA Library Kit:

Thanks in advance for the sharing.


Last edited by weigrc; 09-17-2015 at 08:58 PM.
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Old 04-18-2017, 01:47 PM   #5
Junior Member
Location: NYC

Join Date: Sep 2011
Posts: 1

Weigrc, what has been your experience with the swift accel NGS kit?
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