Dear Henri-Jean,

In order to receive the full query result, if you use the BioMart web query 
interface (martview), in the result page you need to choose "All" rows and 
select the "Unique results only" checkbox. Below is the result I got after 
doing so:

Ensembl Gene ID MGI ID MGI symbol EntrezGene ID
ENSMUSG00000020826 MGI:97361 Nos2 18126
ENSMUSG00000026073 MGI:96546 Il1r2 16178
ENSMUSG00000026073 MGI:96546 Il1r2
ENSMUSG00000026180 MGI:105303 Cxcr2 12765
ENSMUSG00000030077 MGI:1098266 Chl1
ENSMUSG00000030077 MGI:1098266 Chl1 12661
ENSMUSG00000035208 MGI:2672859 Slfn8 276950
ENSMUSG00000035208 MGI:2672859 Slfn8 100505399
ENSMUSG00000035208 MGI:2672859 Slfn8
ENSMUSG00000050075 MGI:2442043 Gpr171 229323
ENSMUSG00000053846 MGI:1341803 Lipg 16891
ENSMUSG00000069830 MGI:2684861 Nlrp1a 195046
ENSMUSG00000069830 MGI:2684861 Nlrp1a
ENSMUSG00000070501 MGI:3584522 BC094916 545384
ENSMUSG00000070501 MGI:3584522 BC094916
ENSMUSG00000078853 MGI:107729 Igtp 16145
ENSMUSG00000078853 MGI:107729 Igtp

The result does not miss any of your 10 input mouse genes, and all of them have 
at least one corresponding EntrezGeneID. In terms of rows with missing 
EntrezID, you can safely ignore them. The reason such duplicate happens has 
something to do with how data is organized internally.

If you use biomaRt, there should be a way to remove size limit of result to be 
returned so you do just see the first 10 rows.

Let us know if you still have any questions.

Best regards,

Junjun



On 11-06-24 5:00 AM, "Henri-Jean GARCHON" <[email protected]> wrote:


From: Henri-Jean GARCHON <[email protected]>
Reply-To: <[email protected]>
Date: Fri, 24 Jun 2011 04:48:24 -0400
To: <[email protected]>
Subject: biomaRt and ENTREZ issue

   Hi,

 I am not sure whether there is a mailing list to share my (lack of) experience!
 However, I am contacting you because I found the following issue with queries 
for Entrez Gene IDs.
 Actually, initially, this was using biomaRt Bioconductor package but it is 
clearly not an issue of biomaRt.
 When I interrogate ENTREZ, duplicated items are returned: one with the correct 
Entrez ID, the others empty.

 For example:
 Input:
 ENSMUSG00000026073
 ENSMUSG00000026180
 ENSMUSG00000053846
 ENSMUSG00000035208
 ENSMUSG00000069830
 ENSMUSG00000078853
 ENSMUSG00000020826
 ENSMUSG00000030077
 ENSMUSG00000050075
 ENSMUSG00000070501

 Normal output:

Ensembl Gene ID Associated Gene Name MGI symbol Chromosome Name Gene Start (bp) 
Gene End (bp)
ENSMUSG00000020826 Nos2 Nos2 11 78734289 78773756
ENSMUSG00000026073 Il1r2 Il1r2 1 40141613 40182064
ENSMUSG00000026180 Cxcr2 Cxcr2 1 74200563 74207812
ENSMUSG00000030077 Chl1 Chl1 6 103460870 103699671
ENSMUSG00000035208 Slfn8 Slfn8 11 82815660 82834312
ENSMUSG00000050075 Gpr171 Gpr171 3 58900370 58905743
ENSMUSG00000053846 Lipg Lipg 18 75098976 75120917
ENSMUSG00000069830 Nlrp1a Nlrp1a 11 70904699 70958290
ENSMUSG00000070501 BC094916 BC094916 1 175449848 175466088
ENSMUSG00000078853 Igtp Igtp 11 58013058 58021093
 Output with Entrez Gene ID:

Ensembl Gene ID Associated Gene Name MGI symbol Chromosome Name Gene Start (bp) 
Gene End (bp) EntrezGene ID
ENSMUSG00000020826 Nos2 Nos2 11 78734289 78773756 18126
ENSMUSG00000026073 Il1r2 Il1r2 1 40141613 40182064 16178
ENSMUSG00000026073 Il1r2 Il1r2 1 40141613 40182064
ENSMUSG00000026180 Cxcr2 Cxcr2 1 74200563 74207812 12765
ENSMUSG00000026180 Cxcr2 Cxcr2 1 74200563 74207812 12765
ENSMUSG00000030077 Chl1 Chl1 6 103460870 103699671
ENSMUSG00000030077 Chl1 Chl1 6 103460870 103699671 12661
ENSMUSG00000030077 Chl1 Chl1 6 103460870 103699671
ENSMUSG00000035208 Slfn8 Slfn8 11 82815660 82834312 276950
ENSMUSG00000035208 Slfn8 Slfn8 11 82815660 82834312 100505399
 Ten items, but only 5 distinct,  are returned. So we are missing 5 items.
 Of course the issue might be at the level of ENTREZ.
 In anticipation, I thank you for your help.
 Kind regards

 Dr Henri-Jean Garchon

 Henri-Jean Garchon, MD, PhD
 Director of Research
 Cochin Institute and Inserm U1016
 Department of Immunology
 Laboratory of Chronic Inflammation
 Pavillon Hardy A 1st floor
 27 rue du Faubourg Saint-Jacques
 75014 Paris
 France
 phone +33 1 40 51 66 06
 fax:+33 1 40 51 66 41
 mail: [email protected]


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