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Aliases for CFI Gene

Aliases for CFI Gene

  • Complement Factor I 2 3
  • Konglutinogen-Activating Factor 2 3
  • C3B/C4B Inactivator 3 4
  • C3b-Inactivator 2 3
  • ARMD13 3 6
  • AHUS3 3 6
  • IF 3 4
  • FI 3 6
  • Complement Control Protein Factor I 3
  • Complement Factor I Heavy Chain 3
  • Light Chain Of Factor I 3
  • Complement Component I 3
  • I Factor (Complement) 2
  • EC 4
  • EC 3.4.21 63
  • C3b-INA 3
  • C3BINA 3
  • KAF 3

External Ids for CFI Gene

Previous HGNC Symbols for CFI Gene

  • IF

Previous GeneCards Identifiers for CFI Gene

  • GC04M110881
  • GC04M110661
  • GC04M106394

Summaries for CFI Gene

Entrez Gene Summary for CFI Gene

  • This gene encodes a serine proteinase that is essential for regulating the complement cascade. The encoded preproprotein is cleaved to produce both heavy and light chains, which are linked by disulfide bonds to form a heterodimeric glycoprotein. This heterodimer can cleave and inactivate the complement components C4b and C3b, and it prevents the assembly of the C3 and C5 convertase enzymes. Defects in this gene cause complement factor I deficiency, an autosomal recessive disease associated with a susceptibility to pyogenic infections. Mutations in this gene have been associated with a predisposition to atypical hemolytic uraemic syndrome, a disease characterized by acute renal failure, microangiopathic hemolytic anemia and thrombocytopenia. Primary glomerulonephritis with immmune deposits is another condition associated with mutation of this gene. [provided by RefSeq, Jul 2008]

GeneCards Summary for CFI Gene

CFI (Complement Factor I) is a Protein Coding gene. Diseases associated with CFI include complement factor i deficiency and hemolytic uremic syndrome, atypical 3. Among its related pathways are Complement and coagulation cascades and Staphylococcus aureus infection. GO annotations related to this gene include serine-type endopeptidase activity and scavenger receptor activity. An important paralog of this gene is CORIN.

UniProtKB/Swiss-Prot for CFI Gene

  • Responsible for cleaving the alpha-chains of C4b and C3b in the presence of the cofactors C4-binding protein and factor H respectively

Gene Wiki entry for CFI Gene

No data available for Tocris Summary , PharmGKB "VIP" Summary , fRNAdb sequence ontologies and piRNA Summary for CFI Gene

Genomics for CFI Gene

Regulatory Elements for CFI Gene

Genomic Location for CFI Gene

109,740,692 bp from pter
109,802,225 bp from pter
61,534 bases
Minus strand

Genomic View for CFI Gene

UCSC Golden Path with GeneCards custom track
Cytogenetic band:
Genomic Location for CFI Gene
GeneLoc Logo Genomic Neighborhood Exon StructureGene Density

RefSeq DNA sequence for CFI Gene

Proteins for CFI Gene

  • Protein details for CFI Gene (UniProtKB/Swiss-Prot)

    Protein Symbol:
    Recommended name:
    Complement factor I
    Protein Accession:
    Secondary Accessions:
    • O60442

    Protein attributes for CFI Gene

    583 amino acids
    Molecular mass:
    65750 Da
    Quaternary structure:
    • Heterodimer of a light and heavy chains; disulfide-linked. The fully processed and mature protein circulates as a zymogen, and is allosterically activated by substrate-induced remodeling of the active site.
    • Sequence=CAA68416.1; Type=Erroneous initiation; Note=Translation N-terminally shortened.; Evidence={ECO:0000305};

    Three dimensional structures from OCA and Proteopedia for CFI Gene

neXtProt entry for CFI Gene

Proteomics data for CFI Gene at MOPED

Selected DME Specific Peptides for CFI Gene

Post-translational modifications for CFI Gene

  • Glycosylation at Asn70, Asn103, Asn177, Asn464, Asn494, and Asn536
  • Modification sites at PhosphoSitePlus

Other Protein References for CFI Gene

ENSEMBL proteins:
Reactome Protein details:
REFSEQ proteins:

Antibody Products

  • R&D Systems Antibodies for CFI (Complement Factor I)

Domains for CFI Gene

Gene Families for CFI Gene

Suggested Antigen Peptide Sequences for CFI Gene

GenScript: Design optimal peptide antigens:

Graphical View of Domain Structure for InterPro Entry



  • Contains 1 Kazal-like domain.
  • Belongs to the peptidase S1 family.
  • Contains 1 Kazal-like domain.
  • Contains 2 LDL-receptor class A domains.
  • Contains 1 peptidase S1 domain.
  • Contains 1 SRCR domain.
  • Belongs to the peptidase S1 family.
genes like me logo Genes that share domains with CFI: view

Function for CFI Gene

Molecular function for CFI Gene

UniProtKB/Swiss-Prot CatalyticActivity:
Inactivates complement subcomponents C3b, iC3b and C4b by proteolytic cleavage
UniProtKB/Swiss-Prot Function:
Responsible for cleaving the alpha-chains of C4b and C3b in the presence of the cofactors C4-binding protein and factor H respectively

Enzyme Numbers (IUBMB) for CFI Gene

Gene Ontology (GO) - Molecular Function for CFI Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0003824 catalytic activity --
GO:0004252 serine-type endopeptidase activity IEA --
GO:0005044 scavenger receptor activity IEA --
GO:0005515 protein binding IPI 16237761
GO:0046872 metal ion binding IEA --
genes like me logo Genes that share ontologies with CFI: view

Phenotypes for CFI Gene

genes like me logo Genes that share phenotypes with CFI: view

Animal Models for CFI Gene

MGI Knock Outs for CFI:

miRNA for CFI Gene

miRNA Products

Inhibitory RNA Products

  • Predesigned siRNA for gene silencing in human,mouse,rat for CFI

In Situ Assay Products

Flow Cytometry Products

No data available for Transcription Factor Targets and HOMER Transcription for CFI Gene

Localization for CFI Gene

Subcellular locations from UniProtKB/Swiss-Prot for CFI Gene

Secreted, extracellular space.

Subcellular locations from

Jensen Localization Image for CFI Gene COMPARTMENTS Subcellular localization image for CFI gene
Compartment Confidence
extracellular 5
cytoskeleton 2
cytosol 2
nucleus 2
plasma membrane 2
endoplasmic reticulum 1
lysosome 1
mitochondrion 1
peroxisome 1

Gene Ontology (GO) - Cellular Components for CFI Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0005576 extracellular region TAS --
GO:0005615 extracellular space IDA 16502470
GO:0005634 nucleus IEA --
GO:0016020 membrane IEA --
GO:0070062 extracellular exosome IDA 19056867
genes like me logo Genes that share ontologies with CFI: view

Pathways for CFI Gene

genes like me logo Genes that share pathways with CFI: view

Gene Ontology (GO) - Biological Process for CFI Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0006508 proteolysis IEA --
GO:0006898 receptor-mediated endocytosis IEA --
GO:0006958 complement activation, classical pathway IEA --
GO:0030449 regulation of complement activation TAS --
GO:0045087 innate immune response TAS --
genes like me logo Genes that share ontologies with CFI: view

Drugs for CFI Gene

(24) Novoseek inferred chemical compound relationships for CFI Gene

Compound -log(P) Hits PubMed IDs
serine 46.2 31
aebsf 35.3 1
heparin 34.8 5
fibrinogen 31.6 12
kininogen 15.1 1
genes like me logo Genes that share compounds with CFI: view

Transcripts for CFI Gene

Unigene Clusters for CFI Gene

Complement factor I:
Representative Sequences:

miRNA Products

Inhibitory RNA Products

  • Predesigned siRNA for gene silencing in human,mouse,rat for CFI

Flow Cytometry Products

Alternative Splicing Database (ASD) splice patterns (SP) for CFI Gene

No ASD Table

Relevant External Links for CFI Gene

GeneLoc Exon Structure for
ECgene alternative splicing isoforms for

Expression for CFI Gene

mRNA expression in normal human tissues for CFI Gene

mRNA expression in embryonic tissues and stem cells from LifeMap Discovery

mRNA differential expression in normal tissues according to GTEx for CFI Gene

This gene is overexpressed in Liver (20.5) and Kidney - Cortex (4.5).

Protein differential expression in normal tissues for CFI Gene

This gene is overexpressed in Serum (23.9), Plasma (12.4), Synovial fluid (10.0), and Vitreous humor (8.4).

Integrated Proteomics: protein expression from ProteomicsDB, PaxDb, MOPED, and MaxQB for CFI Gene

SOURCE GeneReport for Unigene cluster for CFI Gene Hs.312485

mRNA Expression by UniProt/SwissProt for CFI Gene

Tissue specificity: Plasma
genes like me logo Genes that share expressions with CFI: view

Expression partners for CFI Gene

* - Elite partner

Primer Products

In Situ Assay Products

Orthologs for CFI Gene

This gene was present in the common ancestor of animals.

Orthologs for CFI Gene

Organism Taxonomy Gene Similarity Type Details
(Bos Taurus)
Mammalia CFI 35
  • 80.5 (n)
  • 71.7 (a)
CFI 36
  • 64 (a)
(Canis familiaris)
Mammalia CFI 35
  • 81.35 (n)
  • 72.2 (a)
CFI 36
  • 68 (a)
(Mus musculus)
Mammalia Cfi 35
  • 76.86 (n)
  • 70.79 (a)
Cfi 16
Cfi 36
  • 65 (a)
(Pan troglodytes)
Mammalia CFI 35
  • 98.91 (n)
  • 98.11 (a)
CFI 36
  • 95 (a)
(Rattus norvegicus)
Mammalia Cfi 35
  • 77.21 (n)
  • 71.65 (a)
(Monodelphis domestica)
Mammalia CFI 36
  • 53 (a)
(Ornithorhynchus anatinus)
Mammalia CFI 36
  • 49 (a)
(Gallus gallus)
Aves CFI 35
  • 62.63 (n)
  • 53.02 (a)
CFI 36
  • 47 (a)
(Anolis carolinensis)
Reptilia -- 36
  • 49 (a)
-- 36
  • 47 (a)
tropical clawed frog
(Silurana tropicalis)
Amphibia cfi 35
  • 60.05 (n)
  • 55.01 (a)
African clawed frog
(Xenopus laevis)
Amphibia Xl.1143 35
(Danio rerio)
Actinopterygii cfi 35
  • 52.73 (n)
  • 45.17 (a)
CFI 36
  • 34 (a)
fruit fly
(Drosophila melanogaster)
Insecta CG1632 36
  • 8 (a)
Corin 36
  • 9 (a)
ndl 36
  • 4 (a)
Species with no ortholog for CFI:
  • A. gosspyii yeast (Ashbya gossypii)
  • Actinobacteria (Mycobacterium tuberculosis)
  • African malaria mosquito (Anopheles gambiae)
  • Alicante grape (Vitis vinifera)
  • alpha proteobacteria (Wolbachia pipientis)
  • amoeba (Dictyostelium discoideum)
  • Archea (Pyrococcus horikoshii)
  • baker's yeast (Saccharomyces cerevisiae)
  • barley (Hordeum vulgare)
  • beta proteobacteria (Neisseria meningitidis)
  • bread mold (Neurospora crassa)
  • Chromalveolata (Phytophthora infestans)
  • common water flea (Daphnia pulex)
  • corn (Zea mays)
  • E. coli (Escherichia coli)
  • filamentous fungi (Aspergillus nidulans)
  • Firmicute bacteria (Streptococcus pneumoniae)
  • fission yeast (Schizosaccharomyces pombe)
  • green algae (Chlamydomonas reinhardtii)
  • honey bee (Apis mellifera)
  • K. lactis yeast (Kluyveromyces lactis)
  • loblloly pine (Pinus taeda)
  • malaria parasite (Plasmodium falciparum)
  • medicago trunc (Medicago Truncatula)
  • moss (Physcomitrella patens)
  • orangutan (Pongo pygmaeus)
  • pig (Sus scrofa)
  • rainbow trout (Oncorhynchus mykiss)
  • rice (Oryza sativa)
  • rice blast fungus (Magnaporthe grisea)
  • schistosome parasite (Schistosoma mansoni)
  • sea anemone (Nematostella vectensis)
  • sea squirt (Ciona intestinalis)
  • sea squirt (Ciona savignyi)
  • sea urchin (Strongylocentrotus purpuratus)
  • sorghum (Sorghum bicolor)
  • soybean (Glycine max)
  • stem rust fungus (Puccinia graminis)
  • sugarcane (Saccharum officinarum)
  • thale cress (Arabidopsis thaliana)
  • tomato (Lycopersicon esculentum)
  • toxoplasmosis (Toxoplasma gondii)
  • Trichoplax (Trichoplax adhaerens)
  • wheat (Triticum aestivum)
  • worm (Caenorhabditis elegans)

Evolution for CFI Gene

Gene Tree for CFI (if available)
Gene Tree for CFI (if available)

Paralogs for CFI Gene

Paralogs for CFI Gene

genes like me logo Genes that share paralogs with CFI: view

Variants for CFI Gene

Sequence variations from dbSNP and Humsavar for CFI Gene

SNP ID Clin Chr 04 pos Sequence Context AA Info Type MAF
rs551 -- 109,740,781(-) TCTCA(C/T)TGGAT utr-variant-3-prime, downstream-variant-500B
rs885448 -- 109,769,503(-) GCTGC(A/T)GTCCC intron-variant
rs998538 -- 109,787,474(+) AGATG(C/T)CCCAC intron-variant
rs998539 -- 109,787,480(+) CCCAC(A/G)AACTC intron-variant
rs1000954 -- 109,788,878(-) TTTAT(A/G)ACTTC intron-variant

Structural Variations from Database of Genomic Variants (DGV) for CFI Gene

Variant ID Type Subtype PubMed ID
nsv4463 CNV Loss 18451855
esv1651639 CNV Deletion 17803354
esv26742 CNV Gain 19812545

Relevant External Links for CFI Gene

HapMap Linkage Disequilibrium report
Human Gene Mutation Database (HGMD)
Locus Specific Mutation Databases (LSDB)

No data available for Polymorphic Variants from UniProtKB/Swiss-Prot for CFI Gene

Disorders for CFI Gene

(3) OMIM Diseases for CFI Gene (217030)


  • Hemolytic uremic syndrome atypical 3 (AHUS3) [MIM:612923]: An atypical form of hemolytic uremic syndrome. It is a complex genetic disease characterized by microangiopathic hemolytic anemia, thrombocytopenia, renal failure and absence of episodes of enterocolitis and diarrhea. In contrast to typical hemolytic uremic syndrome, atypical forms have a poorer prognosis, with higher death rates and frequent progression to end-stage renal disease. {ECO:0000269 PubMed:15173250, ECO:0000269 PubMed:16621965, ECO:0000269 PubMed:17106690, ECO:0000269 PubMed:20513133}. Note=Disease susceptibility is associated with variations affecting the gene represented in this entry. Other genes may play a role in modifying the phenotype.
  • Complement factor I deficiency (CFI deficiency) [MIM:610984]: Autosomal recessive condition associated with a propensity to pyogenic infections. {ECO:0000269 PubMed:12562389, ECO:0000269 PubMed:17018561, ECO:0000269 PubMed:8613545}. Note=The disease is caused by mutations affecting the gene represented in this entry.
  • Macular degeneration, age-related, 13 (ARMD13) [MIM:615439]: A form of age-related macular degeneration, a multifactorial eye disease and the most common cause of irreversible vision loss in the developed world. In most patients, the disease is manifest as ophthalmoscopically visible yellowish accumulations of protein and lipid that lie beneath the retinal pigment epithelium and within an elastin-containing structure known as Bruch membrane. {ECO:0000269 PubMed:23685748}. Note=Disease susceptibility is associated with variations affecting the gene represented in this entry.

(44) Novoseek inferred disease relationships for CFI Gene

Disease -log(P) Hits PubMed IDs
afibrinogenemia 90.1 44
uremic syndrome 82.5 19
hemolysis 25.3 2
glomerulonephritis 24.1 3
septicemia 19.8 2

Relevant External Links for CFI

Genetic Association Database (GAD)
Human Genome Epidemiology (HuGE) Navigator
genes like me logo Genes that share disorders with CFI: view

No data available for Genatlas for CFI Gene

Publications for CFI Gene

  1. Beta-sheet secondary structure of an LDL receptor domain from complement factor I by consensus structure predictions and spectroscopy. (PMID: 7672128) Ullman C.G. … Perkins S.J. (FEBS Lett. 1995) 3 4 23
  2. Cloning and characterization of the promoter for the human complement factor I (C3b/C4b inactivator) gene. (PMID: 9479036) Minta J.O. … Goldberger G. (Gene 1998) 3 4 23
  3. Molecular basis of complement factor I (CFI) polymorphism: one of two polymorphic suballeles responsible for CFI A is Japanese-specific. (PMID: 18825487) Yuasa I. … Henke J. (J. Hum. Genet. 2008) 3 23 48
  4. Human complement factor I: analysis of cDNA-derived primary structure and assignment of its gene to chromosome 4. (PMID: 2956252) Goldberger G. … Kwiatkowski D.J. (J. Biol. Chem. 1987) 2 3 4
  5. Genetics of HUS: the impact of MCP, CFH, and IF mutations on clinical presentation, response to treatment, and outcome. (PMID: 16621965) Caprioli J. … Remuzzi G. (Blood 2006) 3 4 48

Products for CFI Gene

Sources for CFI Gene

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