ABHD18

ABHD18 is a protein that in Homo sapiens is encoded by the ABHD18 gene.[5]

ABHD18
Identifiers
AliasesABHD18, C4orf29, abhydrolase domain containing 18
External IDsMGI: 1915468 HomoloGene: 105457 GeneCards: ABHD18
Orthologs
SpeciesHumanMouse
Entrez

80167

269423

Ensembl

ENSG00000164074

ENSMUSG00000037818

UniProt

Q0P651

Q8C1A9

RefSeq (mRNA)

NM_026622

RefSeq (protein)

NP_080898
NP_001364039
NP_001364040
NP_001364041

Location (UCSC)Chr 4: 127.97 – 128.04 MbChr 3: 40.85 – 40.94 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse
Chromosome 4 open reading frame 29
Identifiers
SymbolC4orf29
NCBI gene80167
HGNC26111
RefSeqNP_001034806.1
UniProtQ0P651
Other data
LocusChr. 4 q28.2
Search for
StructuresSwiss-model
DomainsInterPro

Gene

ABHD18 is found on the positive strand of the human genome at 4q28.2. It is 74.4 kbp. The gene contains 17 exons.[6] The longest mRNA transcript is composed of 13 exons and is 2200 base pairs.[5]

Location of C4orf29 on human chromosome 4[7]

Homology

Orthologs

Many orthologs to human ABHD18 have been discovered, with the most distant ortholog with high (over 90%) coverage is found in rice Oryza sativa.[8] The protein is not found in fungi. Bacteria of the order Myxobacteria and genus Chitinimonas contain orthologous regions to the C4orf29 protein. The few bacterial homologs indicate a horizontal gene transfer event. The domain of unknown function, DUF2048, is conserved throughout orthologs.

OrganismNCBI Accession NumberDivergence from Humans (Million Years)Protein Length (Amino Acids)Sequence Identity to HumanSequence Similarity to Human
HumanNP_001034806.10414100%100%
DogXP_005631879.194.248487%89%
CanaryXP_009094557.129641475%87%
Painted turtleXP_005282815.129646473%83%
AntXP_011141314.178246846%64%
Flat WormNP_492206.193737833%50%
RiceNP_001046183.1136936631%47%
Cystobacter violaceusWP_043404439.1253532131%52%
Tertiary structure of C4orf29 [9]

Protein

ABHD18 codes a 414 amino acid sequence of 46.9 kDa in humans. The predicted isoelectric point is 9.37.[10] The domain of unknown function, DUF2048, is found from amino acid residues 25 to 414 in the precursor C4orf29 protein.[11] This domain is part of the alpha/beta hydrolase superfamily, which comprises enzymes that catalyze fat metabolism. Predicted post-translational modifications include glycosylation at residues Ser287 and Ser319 [12] and sumoylation[13] at the motifs Phe240 to Gly243, Ala377 to Asp340, and Phe408 to Gly411.

Expression

The protein product of ABHD18 in humans is predicted to be a secreted product. It is ubiquitously expressed at low to moderate levels.[14] In humans, the protein is found at high levels the digestive tract and parathyroid gland.[15] The homologous mouse protein 3110057O12Rik is expressed at high levels in the granule layer of the cerebellum.[16]

Clinical significance

ABHD18 contains highly variable numbers of Alu repeats.[17] A low number of Alu repeats in the human ABHD18 protein is associated with increase prevalence of hepatocellular carcinoma (HCC) in Asian populations. This information is used as a genetic marker to determine genetic risk of HCC.[18] Swine muscle transcriptome analysis indicates high expression of ABHD18 in swine with extreme low levels of fatty acid composition.[19]

References
  1. GRCh38: Ensembl release 89: ENSG00000164074 - Ensembl, May 2017
  2. GRCm38: Ensembl release 89: ENSMUSG00000037818 - Ensembl, May 2017
  3. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. "C4orf29". NCBI Gene. NCBI. Retrieved 5 May 2015.
  6. "C4orf29". NCBI AceView. Retrieved 2015-05-05.
  7. "C4orf29". GeneCards Human Gene Database.
  8. "NP_001034806". NCBI Protein BLAST.
  9. Kelley, LA; Sternberg, MJE. "Protein structure prediction on the web: a case study using the Phyre server". Phyre2. Retrieved 16 Apr 2015.
  10. "C4orf29 (human)". Phosphosite.org. Retrieved 2015-05-05.
  11. "uncharacterized protein C4orf29 precursor [Homo sapiens]". NCBI Protein.
  12. "NetOGlyc4.0 C4orf29". CBS Prediction Servers.
  13. "C4orf29 Sumoylation". ABGENT.
  14. "Large-scale analysis of the human transcriptome GDS596". NCBI GeoProfile. Retrieved 2015-05-05.
  15. "C4orf29". The Human Protein Atlas. Retrieved 2015-05-05.
  16. "3110057O12Rik". Allen Brain Atlas. Retrieved 2015-05-05.
  17. Osenberg S, Paz Yaacov N, Safran M, Moshkovitz S, Shtrichman R, Sherf O, Jacob-Hirsch J, Keshet G, Amariglio N, Itskovitz-Eldor J, Rechavi G (June 2010). "Alu sequences in undifferentiated human embryonic stem cells display high levels of A-to-I RNA editing". PLOS ONE. 5 (6): e11173. Bibcode:2010PLoSO...511173O. doi:10.1371/journal.pone.0011173. PMC 2888580. PMID 20574523.
  18. Clifford RJ, Zhang J, Meerzaman DM, Lyu MS, Hu Y, Cultraro CM, Finney RP, Kelley JM, Efroni S, Greenblum SI, Nguyen CV, Rowe WL, Sharma S, Wu G, Yan C, Zhang H, Chung YH, Kim JA, Park NH, Song IH, Buetow KH (December 2010). "Genetic variations at loci involved in the immune response are risk factors for hepatocellular carcinoma". Hepatology. 52 (6): 2034–43. doi:10.1002/hep.23943. PMC 8259333. PMID 21105107. S2CID 5286278.
  19. Puig-Oliveras A, Ramayo-Caldas Y, Corominas J, Estellé J, Pérez-Montarelo D, Hudson NJ, Casellas J, Folch JM, Ballester M (June 2014). "Differences in muscle transcriptome among pigs phenotypically extreme for fatty acid composition". PLOS ONE. 9 (6): e99720. Bibcode:2014PLoSO...999720P. doi:10.1371/journal.pone.0099720. PMC 4057286. PMID 24926690.


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