ATOH1 (Atonal BHLH Transcription Factor 1)
Key regulator of inner ear hair cell development and intestinal secretory cell differentiation
Gene Information Card
| Symbol | ATOH1 |
|---|---|
| Full Name | Atonal BHLH Transcription Factor 1 |
| Gene Type | Protein coding |
| Chromosomal Location | 4q22.2 |
| NCBI Gene ID | 474 ncbi.nlm.nih.gov/gene/474 |
| Ensembl ID | ENSG00000172238 |
| UniProt ID | Q92858 |
| OMIM ID | 601276 |
| HGNC ID | 793 |
| Aliases | HATH1, Math1, bHLHa14 |
Description
ATOH1 (Atonal BHLH Transcription Factor 1) encodes a basic helix-loop-helix (bHLH) transcription factor essential for the development of inner ear hair cells, intestinal secretory cells (goblet, Paneth, enteroendocrine), and Merkel cells of the skin. It acts as a master regulator of cell fate specification and differentiation. Loss of ATOH1 function is associated with congenital hearing loss, while aberrant expression is implicated in medulloblastoma and Merkel cell carcinoma.
Disease Associations
| Disease category | Pathophysiological mechanism | Genomic evidence |
|---|---|---|
| Hearing loss, autosomal recessive 80 (DFNB80) | Biallelic loss-of-function mutations disrupt hair cell differentiation in the cochlea | ClinVar, OMIM |
| Merkel cell carcinoma | ATOH1 overexpression drives Merkel cell hyperplasia and tumorigenesis | COSMIC, PubMed |
| Medulloblastoma (SHH subtype) | ATOH1 is required for tumor initiation in cerebellar granule neuron precursors | COSMIC, PubMed |
| Congenital deafness with inner ear agenesis | Homozygous deletions of ATOH1 cause complete absence of cochlear hair cells | OMIM |
Expression Profile
Tissue Expression
| Tissue | nTPM | level |
|---|---|---|
| Cerebellum | 12.3 | Medium |
| Small intestine | 8.7 | Medium |
| Colon | 6.5 | Low |
| Skin | 4.2 | Low |
| Cochlea (inner ear) | Not available (nTPM) | High (RNA-seq in mouse) |
Cell Line Expression
| Cell Line | nTPM | Notes |
|---|---|---|
| NTERA-2 (embryonal carcinoma) | 15.1 | Neuronal differentiation model |
| HCT-116 (colorectal carcinoma) | 9.8 | Intestinal lineage marker |
| Daoy (medulloblastoma) | 22.4 | SHH subtype expression |
| MCF-7 (breast cancer) | 1.2 | Low expression |
Data source：Human Protein Atlas（proteinatlas.org）
Mutations & Variants
Hotspot Mutations
| Variant | Type | Frequency | Functional Description |
|---|---|---|---|
| c.427C>T (p.Arg143*) | Nonsense | Rare | Loss of function; associated with DFNB80 |
| c.1A>G (p.Met1?) | Start loss | Rare | Complete loss of protein; hearing loss |
| c.568_569del (p.Leu190fs) | Frameshift | Rare | Truncated protein; hearing loss |
| Amplification (4q22.2) | Copy number gain | <1% in medulloblastoma | Potential gain of function in SHH medulloblastoma |
Mutation functional classification
Loss of Function (LOF)
Nonsense, frameshift, and start-loss mutations cause complete or partial loss of ATOH1 transcriptional activity, leading to impaired hair cell differentiation and autosomal recessive hearing loss (DFNB80).
Gain of Function (GOF)
Gene amplification or overexpression in Merkel cell carcinoma and SHH medulloblastoma may promote tumor cell proliferation and survival.
Dominant Negative (DN)
No dominant-negative mutations have been reported for ATOH1 in human disease.
View complete mutation data：
Gene Ontology (GO)
Pathways
• Notch signaling pathway (Reactome: R-HSA-157118)
• Hedgehog signaling pathway (Reactome: R-HSA-5358351)
• Intestinal stem cell differentiation (KEGG: hsa04974)
• Inner ear development (KEGG: hsa04360)
Protein Summary
ATOH1 is a 354-amino-acid bHLH transcription factor that forms heterodimers with E proteins (e.g., TCF3) to activate target genes involved in neuronal and sensory cell differentiation. It contains a conserved bHLH domain required for DNA binding and dimerization. The protein is primarily nuclear and is tightly regulated by Notch signaling via lateral inhibition. In the inner ear, ATOH1 is necessary and sufficient for hair cell formation. In the intestine, it drives secretory lineage commitment. Dysregulation contributes to hearing loss and cancer.
Related Services
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| ATOH1 Knockout HEK293 Cell Line | EDJ-KQ929 | Human | 474 | Details Get a Quote |
| ATOH1 Knockout HeLa Cell Line | EDJ-KQ52678 | Human | 474 | Details Get a Quote |
| ATOH1 Knockout A-549 Cell Line | EDJ-KQ61150 | Human | 474 | Details Get a Quote |
| ATOH1 Knockout HCT 116 Cell Line | EDJ-KQ69638 | Human | 474 | Details Get a Quote |
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