FOXG1
Forkhead Box G1: A Master Regulator of Forebrain Development and Telencephalon Patterning
Gene Information Card
| Symbol | FOXG1 |
|---|---|
| Full Name | Forkhead Box G1 |
| Gene Type | Protein coding |
| Chromosomal Location | 14q12 |
| NCBI Gene ID | 2290 ncbi.nlm.nih.gov/gene/2290 |
| Ensembl ID | ENSG00000176165 |
| UniProt ID | P55316 |
| OMIM ID | 164874 |
| HGNC ID | 3811 |
| Aliases | BF1, BF-1, FKHL1, FOXG1B, QIN |
Description
FOXG1 (Forkhead Box G1) is a transcription factor belonging to the forkhead family, characterized by a conserved DNA-binding forkhead domain. It is a master regulator of forebrain development, particularly the telencephalon, where it controls progenitor cell proliferation, neuronal differentiation, and regional patterning. FOXG1 represses the expression of genes that promote the formation of the midbrain and hindbrain, thereby establishing the telencephalic fate. It also plays roles in postnatal neurogenesis and synaptic plasticity. Loss-of-function mutations in FOXG1 cause FOXG1 syndrome, a severe neurodevelopmental disorder overlapping with Rett syndrome, characterized by microcephaly, intellectual disability, epilepsy, and movement disorders.
Disease Associations
| Disease category | Pathophysiological mechanism | Genomic evidence |
|---|---|---|
| FOXG1 syndrome (Congenital Rett syndrome variant) | Loss-of-function mutations (haploinsufficiency) disrupt forebrain development, leading to microcephaly, agenesis of the corpus callosum, and severe intellectual disability. | ClinVar, OMIM #613454 |
| Rett syndrome (atypical) | Missense or frameshift mutations in FOXG1 can cause a Rett-like phenotype with preserved speech variant or early-onset seizures. | ClinVar, OMIM #312750 |
| Epileptic encephalopathy, early infantile | De novo FOXG1 mutations are associated with infantile spasms and hypsarrhythmia, often with severe developmental delay. | ClinVar, PMID: 21364701 |
| Microcephaly, primary autosomal recessive | Homozygous or compound heterozygous FOXG1 mutations can cause primary microcephaly with simplified gyral pattern. | ClinVar, PMID: 21937992 |
Expression Profile
Tissue Expression
| Tissue | nTPM | level |
|---|---|---|
| Brain | 12.8 | High |
| Cerebral cortex | 15.2 | High |
| Fetal brain | 18.5 | High |
| Cerebellum | 3.1 | Low |
| Testis | 0.5 | Not detected |
| Heart | 0.2 | Not detected |
Cell Line Expression
| Cell Line | nTPM | Notes |
|---|---|---|
| SH-SY5Y (neuroblastoma) | 8.4 | Moderate expression |
| SK-N-SH (neuroblastoma) | 6.1 | Moderate expression |
| U-87 MG (glioblastoma) | 2.3 | Low expression |
| HEK293 (embryonic kidney) | 0.1 | Not detected |
Data source：Human Protein Atlas（proteinatlas.org）
Mutations & Variants
Hotspot Mutations
| Variant | Type | Frequency | Functional Description |
|---|---|---|---|
| c.460dupG (p.Ala154Glyfs*100) | Frameshift | ~5% of FOXG1 syndrome cases | Loss of function; truncated protein lacking forkhead domain |
| c.256C>T (p.Arg86Trp) | Missense | ~3% | Reduced DNA-binding affinity; dominant-negative effect |
| c.460delG (p.Ala154Profs*99) | Frameshift | ~4% | Loss of function; nonsense-mediated decay |
| c.256C>G (p.Arg86Gly) | Missense | ~2% | Impaired transcriptional repression; gain-of-function? (controversial) |
| c.256C>A (p.Arg86Ser) | Missense | ~1% | Altered target gene regulation; likely loss of function |
Mutation functional classification
Loss of Function (LOF)
Most FOXG1 mutations are loss-of-function (haploinsufficiency or dominant-negative), leading to reduced transcriptional repression of target genes (e.g., BMP, WNT) and aberrant forebrain patterning.
Gain of Function (GOF)
Rare missense mutations (e.g., p.Arg86Gly) may exhibit gain-of-function effects by altering target specificity, but evidence is limited and controversial.
Dominant Negative (DN)
Missense mutations in the forkhead domain (e.g., p.Arg86Trp) can act as dominant-negative by forming nonfunctional dimers or competing for DNA binding, reducing wild-type FOXG1 activity.
View complete mutation data：
Gene Ontology (GO)
Pathways
• FOXG1 regulates the BMP and WNT signaling pathways to maintain telencephalic identity (PMID: 21364701).
• FOXG1 interacts with the Notch pathway to control neural progenitor cell maintenance (PMID: 21937992).
• FOXG1 represses the expression of midbrain/hindbrain markers (e.g.
• En2
• Pax2) via direct binding to their regulatory regions (PMID: 21364701).
Protein Summary
FOXG1 is a 489-amino acid transcription factor with a conserved forkhead DNA-binding domain (residues 180–275). It functions as a transcriptional repressor by recruiting corepressors such as Groucho/TLE. The protein is predominantly nuclear and expressed in the developing telencephalon. Post-translational modifications include phosphorylation and sumoylation, which modulate its stability and activity. FOXG1 is essential for maintaining the balance between proliferation and differentiation of neural progenitors; its dysregulation leads to severe neurodevelopmental disorders.
Related Services
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| FOXG1 Knockout HEK293 Cell Line | EDJ-KQ50278 | Human | 2290 | Details Get a Quote |
| FOXG1 Knockout HeLa Cell Line | EDJ-KQ53240 | Human | 2290 | Details Get a Quote |
| FOXG1 Knockout A-549 Cell Line | EDJ-KQ61720 | Human | 2290 | Details Get a Quote |
| FOXG1 Knockout HCT 116 Cell Line | EDJ-KQ70205 | Human | 2290 | Details Get a Quote |
