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Pathway Mouse Mus musculus

Read this first

Every mouse pathway in Reactome is electronically inferred from the curated human one; Reactome's own sentence about that stands beside the record below.

Peroxisomal lipid metabolism

R-MMU-390918 in Reactome release 97: under Fatty acid metabolism, with 26 genes placed in it by the mapping files and 3 child pathways in the hierarchy.

The same number in the other species

Reactome writes the mouse and rat events it infers from a human pathway under the human number with the species token. A door opens only where that species' own list in this release holds the id: R-HSA-390918 (human), R-RNO-390918 (rat). Whether the event was inferred from this one is what the record says.

01The record

Reactome's own record of this pathway

What this tells you

The pathway list, the hierarchy and the genes on this page are read from the files Reactome publishes for Reactome release 97, built into this site on 2026-09-09: the pathway list, the hierarchy relationship file and the two gene mapping files. The record card is the one live read, Reactome's own record of this pathway.

Reactome's download page describes the mapping files: Mapping files link the source database identifier to the lowest level pathway diagram or subset of the pathway, all levels of the pathway hierarchy or database identifier to all reactions. [R13] The gene list here is the all-levels mapping of NCBI Gene ids, filled from the all-levels mapping of Ensembl ids where the NCBI file has no row for a gene; each row names which file it came from by the shape of its source id. Each row carries the evidence codes the file writes for it, as written and unranked, and both where the file writes both; no page of Reactome's documentation the survey read defines the codes, so this page does not expand them. A gene id the identity files do not name is kept as the source's own id with no door rather than turned into a symbol.

Every mouse pathway in Reactome is inferred from the curated human one: We use the set of manually curated human reactions to electronically infer reactions in fourteen evolutionarily divergent eukaryotic species for which high-quality whole-genome sequence data are available, and hence a comprehensive and high-quality set of protein predictions exists. [R11] Reactome's own sentence about what that produces is printed beside the record: The electronically inferred reactions presented in Reactome are thus not data, but hypotheses useful to direct the design of confirmatory experiments. [R11]

On citing what a search finds, Reactome says: It should be remembered that while we strive to contain the most current and accurate data, Reactome should not be used in citations where other primary sources of information are available. [R12] The record card prints the literature Reactome attaches to a curated pathway for that reason. The data are public domain: All data in the Reactome database and files derived from that data are licensed under the Creative Commons Public Domain Dedication (CC0). User may copy, modify, and distribute these data, even for commercial purposes, without asking for permission. Attribution is encouraged but not required. [R10] The pathway illustrations are licensed apart, under CC BY 4.0, and none is shown here.

A gene on this list is one Reactome places in this pathway in this release, and that is all the row says: it does not say the gene is expressed in a tissue or associated with a disease, which are the other two explorers' questions, read from other sources. Reactome's papers of record are [R01] [R02].

  1. [R01] Ragueneau E, Gong C, Sinquin P, Sevilla C, Beavers D, Grentner A, et al. (2026). The Reactome Knowledgebase 2026. Nucleic Acids Research 54:D673-D681. PMID 41251150, doi 10.1093/nar/gkaf1223.
  2. [R02] Milacic M, Beavers D, Conley P, Gong C, Gillespie M, Griss J, et al. (2024). The Reactome Pathway Knowledgebase 2024. Nucleic Acids Research 52:D672-D678. PMID 37941124, doi 10.1093/nar/gkad1025.
  3. [R10] Reactome, reactome.org. License Agreement. https://reactome.org/license, read 2026-09-09.
  4. [R11] Reactome, reactome.org. Computationally inferred events. https://reactome.org/documentation/inferred-events, read 2026-09-09.
  5. [R12] Reactome, reactome.org. Citing us. https://reactome.org/cite, read 2026-09-09.
  6. [R13] Reactome, reactome.org. Download. https://reactome.org/download-data, read 2026-09-09.
Reading this pathway's record from Reactome (the pathway record).Still reading. A first read of a pathway can take a while; this page waits up to 35 seconds for it, and its scripts then bring in the panel, or a line saying what did not arrive.

02The genes

Genes Reactome places in this mouse pathway

The mapping files place 26 genes in this mouse pathway; showing 1 to 26, in pages of 100, sorted by symbol for reading. The order carries no ranking.

Genes Reactome places in this mouse pathway, page 1 of 1
GeneAbcd1Authority11666Mapping file id11666 NCBI fileEvidenceIEA
GeneAcaa1bAuthority235674Mapping file id235674 NCBI fileEvidenceIEA
GeneAcbd5Authority74159Mapping file id74159 NCBI fileEvidenceIEA
GeneAcot4Authority171282Mapping file id171282 NCBI fileEvidenceIEA
GeneAcot8Authority170789Mapping file id170789 NCBI fileEvidenceIEA
GeneAcox1Authority11430Mapping file id11430 NCBI fileEvidenceIEA
GeneAcox2Authority93732Mapping file id93732 NCBI fileEvidenceIEA
GeneAcox3Authority80911Mapping file id80911 NCBI fileEvidenceIEA
GeneAcoxlAuthority74121Mapping file id74121 NCBI fileEvidenceIEA
GeneAldh3a2Authority11671Mapping file id11671 NCBI fileEvidenceIEA
GeneAmacrAuthority17117Mapping file id17117 NCBI fileEvidenceIEA
GeneCratAuthority12908Mapping file id12908 NCBI fileEvidenceIEA
GeneCrotAuthority74114Mapping file id74114 NCBI fileEvidenceIEA
GeneDecr2Authority26378Mapping file id26378 NCBI fileEvidenceIEA
GeneEci2Authority23986Mapping file id23986 NCBI fileEvidenceIEA
GeneEhhadhAuthority74147Mapping file id74147 NCBI fileEvidenceIEA
GeneHacl1Authority56794Mapping file id56794 NCBI fileEvidenceIEA
GeneHao2Authority56185Mapping file id56185 NCBI fileEvidenceIEA
GeneHsd17b4Authority15488Mapping file id15488 NCBI fileEvidenceIEA
GeneMlycdAuthority56690Mapping file id56690 NCBI fileEvidenceIEA
GeneNudt19Authority110959Mapping file id110959 NCBI fileEvidenceIEA
GenePecrAuthority111175Mapping file id111175 NCBI fileEvidenceIEA
GenePhyhAuthority16922Mapping file id16922 NCBI fileEvidenceIEA
GeneScp2Authority20280Mapping file id20280 NCBI fileEvidenceIEA
GeneSlc25a17Authority20524Mapping file id20524 NCBI fileEvidenceIEA
GeneSlc27a2Authority26458Mapping file id26458 NCBI fileEvidenceIEA

Evidence codes on this page: IEA, as the mapping file writes them; a row carrying two was written twice by the file, once under each. The mapping file id says which file placed the gene: an NCBI Gene id from NCBI2Reactome_All_Levels.txt, an Ensembl gene id from Ensembl2Reactome_All_Levels.txt. The two files can disagree about a code, so a row's codes are the one file's view. Measured by this site's build over this release on 2026-09-09: the two files disagree on none of the 87,729 mouse pairs both place.

  • Reactome mapping files, the mouse rows for this pathway · Reactome release 97 · read · Reactome downloads"NCBI2Reactome_All_Levels.txt" and "Ensembl2Reactome_All_Levels.txt", Reactome, release 97, https://reactome.org/download-data/ (date of access 2026-09-09). Data CC0; attribution encouraged.

03The hierarchy

Parents and children in this release's hierarchy

Reactome's hierarchy is a graph rather than a tree: a pathway can sit under more than one parent, and the gene counts are each pathway's own placements at every level under it, so a parent's count is not the sum of its children's.

  • Reactome, the mouse pathway list and hierarchy relationship file · Reactome release 97 · read · Reactome downloads"ReactomePathways.txt" and "ReactomePathwaysRelation.txt", Reactome, release 97, https://reactome.org/download-data/ (date of access 2026-09-09). Data CC0; attribution encouraged.