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Old 08-31-2018, 07:50 AM   #1
mstagliamonte
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Location: Florida

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Posts: 33
Default Need help with Plink map file

Hi,

I plan to phase my non-human organism genomic data using Shapeit2. I have recombination data available from literature, but I am struggling to understand how to set up the map file. I have read around but still not sure how to build the file. This is the description of the map file:

This file can be SPACE or TAB delimited. Each line corresponds to a SNP. The 4 columns are:
1) Chromosome number [integer]
2) SNP ID [string]
3) SNP genetic position (cM) [float]
4) SNP physical position (bp) [integer]

I am not sure on the interpretation of column 3. Let's say I have a known recombination rate of 13mbp/cM and 4 SNPs in position 500, 10,000, 20,000, 33,000 on chromosome 2 : how should the map file look like?

Thank you for your kind attention,
Max
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Old 09-03-2018, 12:27 AM   #2
vivek_
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Default

You could set it to 0 and not have any issues as long as 1 & 4 are accurate.
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Old 09-04-2018, 05:33 AM   #3
mstagliamonte
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Hi, Vivek,

Thank you for your answer. Can you elaborate on that a bit, please?

Thank you,
Max
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map file, phaseit, phasing, plink, recombination rate

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