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Pathway Human Homo sapiens

Fatty acyl-CoA biosynthesis

R-HSA-75105 in Reactome release 97: under Fatty acid metabolism, with 37 genes placed in it by the mapping files and 1 child pathway 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-MMU-75105 (mouse), R-RNO-75105 (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.

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. [R12] Reactome, reactome.org. Citing us. https://reactome.org/cite, read 2026-09-09.
  5. [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 human pathway

The mapping files place 37 genes in this human pathway; showing 1 to 37, in pages of 100, sorted by symbol for reading. The order carries no ranking.

Genes Reactome places in this human pathway, page 1 of 1
GeneACACAAuthorityHGNC:84Mapping file id31 NCBI fileEvidenceTAS
GeneACLYAuthorityHGNC:115Mapping file id47 NCBI fileEvidenceTAS
GeneACSBG1AuthorityHGNC:29567Mapping file id23205 NCBI fileEvidenceTAS
GeneACSBG2AuthorityHGNC:24174Mapping file id81616 NCBI fileEvidenceTAS
GeneACSF3AuthorityHGNC:27288Mapping file id197322 NCBI fileEvidenceTAS
GeneACSL1AuthorityHGNC:3569Mapping file id2180 NCBI fileEvidenceTAS
GeneACSL3AuthorityHGNC:3570Mapping file id2181 NCBI fileEvidenceTAS
GeneACSL4AuthorityHGNC:3571Mapping file id2182 NCBI fileEvidenceTAS
GeneACSL5AuthorityHGNC:16526Mapping file id51703 NCBI fileEvidenceTAS
GeneACSL6AuthorityHGNC:16496Mapping file id23305 NCBI fileEvidenceTAS
GeneCBR4AuthorityHGNC:25891Mapping file id84869 NCBI fileEvidenceTAS
GeneELOVL1AuthorityHGNC:14418Mapping file id64834 NCBI fileEvidenceIEA, TAS
GeneELOVL2AuthorityHGNC:14416Mapping file id54898 NCBI fileEvidenceTAS
GeneELOVL3AuthorityHGNC:18047Mapping file id83401 NCBI fileEvidenceTAS
GeneELOVL4AuthorityHGNC:14415Mapping file id6785 NCBI fileEvidenceIEA
GeneELOVL5AuthorityHGNC:21308Mapping file id60481 NCBI fileEvidenceTAS
GeneELOVL6AuthorityHGNC:15829Mapping file id79071 NCBI fileEvidenceTAS
GeneELOVL7AuthorityHGNC:26292Mapping file id79993 NCBI fileEvidenceTAS
GeneFASNAuthorityHGNC:3594Mapping file id2194 NCBI fileEvidenceIEA, TAS
GeneHACD1AuthorityHGNC:9639Mapping file id9200 NCBI fileEvidenceTAS
GeneHACD2AuthorityHGNC:9640Mapping file id201562 NCBI fileEvidenceTAS
GeneHACD3AuthorityHGNC:24175Mapping file id51495 NCBI fileEvidenceTAS
GeneHACD4AuthorityHGNC:20920Mapping file id401494 NCBI fileEvidenceTAS
GeneHSD17B12AuthorityHGNC:18646Mapping file id51144 NCBI fileEvidenceTAS
GeneHSD17B3AuthorityHGNC:5212Mapping file id3293 NCBI fileEvidenceTAS
GeneHSD17B8AuthorityHGNC:3554Mapping file id7923 NCBI fileEvidenceTAS
GeneHTD2AuthorityHGNC:53111Mapping file id109703458 NCBI fileEvidenceTAS
GeneMORC2AuthorityHGNC:23573Mapping file id22880 NCBI fileEvidenceTAS
GeneOLAHAuthorityHGNC:25625Mapping file id55301 NCBI fileEvidenceIEA
GenePPT1AuthorityHGNC:9325Mapping file id5538 NCBI fileEvidenceTAS
GenePPT2AuthorityHGNC:9326Mapping file id9374 NCBI fileEvidenceTAS
GeneSCDAuthorityHGNC:10571Mapping file id6319 NCBI fileEvidenceTAS
GeneSCD5AuthorityHGNC:21088Mapping file id79966 NCBI fileEvidenceTAS
GeneSLC27A2AuthorityHGNC:10996Mapping file id11001 NCBI fileEvidenceTAS
GeneSLC27A3AuthorityHGNC:10997Mapping file id11000 NCBI fileEvidenceIEA
GeneTECRAuthorityHGNC:4551Mapping file id9524 NCBI fileEvidenceTAS
GeneTECRLAuthorityHGNC:27365Mapping file id253017 NCBI fileEvidenceTAS

Evidence codes on this page: IEA, TAS, 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: of the 138,908 human pathway-gene pairs both files place, 207 (0.149 per cent, over 47 genes) carry TAS in the Ensembl file where the NCBI rows carry IEA alone.

  • Reactome mapping files, the human 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 human 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.