Hey friend, all good?

You can try org.Mm.eg.db and biomaRt. Let's see which one can map these:

lookup <- c('ENSMUST00000110582','ENSMUST00000110585','ENSMUST00000110586',
  'ENSMUST00000135559','ENSMUST00000166082','ENSMUST00000135552',
  'ENSMUST00000207020','ENSMUST00000192677','ENSMUST00000090457','ENSMUST00000207029')
require('org.Mm.eg.db')
keytypes(org.Mm.eg.db)
select(
  org.Mm.eg.db,
  keytype="ENSEMBLTRANS",
  columns = c('ENSEMBL','ENSEMBLTRANS','ENTREZID','SYMBOL'),
  keys = lookup)

         ENSEMBLTRANS            ENSEMBL ENTREZID        SYMBOL
1  ENSMUST00000110582 ENSMUSG00000079083    77532          Jrkl
2  ENSMUST00000110585               <NA>     <NA>          <NA>
3  ENSMUST00000110586               <NA>     <NA>          <NA>
4  ENSMUST00000135559               <NA>     <NA>          <NA>
5  ENSMUST00000166082               <NA>     <NA>          <NA>
6  ENSMUST00000135552               <NA>     <NA>          <NA>
7  ENSMUST00000207020               <NA>     <NA>          <NA>
8  ENSMUST00000192677               <NA>     <NA>          <NA>
9  ENSMUST00000090457 ENSMUSG00000022543    74684 4930451G09Rik
10 ENSMUST00000207029               <NA>     <NA>          <NA>
library(biomaRt)
mart <- useMart('ensembl', dataset="mmusculus_gene_ensembl")

getBM(
  attributes = c('ensembl_gene_id', 'ensembl_transcript_id', 'entrezgene_id', 'mgi_symbol'),
  filters="ensembl_transcript_id",
  values = lookup,
  mart = mart)

      ensembl_gene_id ensembl_transcript_id entrezgene_id    mgi_symbol
1  ENSMUSG00000022543    ENSMUST00000090457         74684 4930451G09Rik
2  ENSMUSG00000079083    ENSMUST00000110582         77532          Jrkl
3  ENSMUSG00000054115    ENSMUST00000110585         27401          Skp2
4  ENSMUSG00000060227    ENSMUST00000110586        319996         Golm2
5  ENSMUSG00000020744    ENSMUST00000135552         67283      Slc25a19
6  ENSMUSG00000038271    ENSMUST00000135559        320678         Iffo1
7  ENSMUSG00000025512    ENSMUST00000166082         68038         Chid1
8  ENSMUSG00000034755    ENSMUST00000192677        245578       Pcdh11x
9  ENSMUSG00000058966    ENSMUST00000207020         68952        Tlcd3b
10 ENSMUSG00000109498    ENSMUST00000207029            NA       Gm45222

Kevin



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