DKC1 Gene: Dyskerin, Telomerase Maintenance, and X-Linked Disease
Comprehensive guide to DKC1 (dyskerin pseudouridine synthase 1): genomic context, expression, mutations, and clinical significance in dyskeratosis congenita and related telomeropathies.
Gene Information Card
| Symbol | DKC1 |
|---|---|
| Full Name | Dyskerin pseudouridine synthase 1 |
| Gene Type | Protein coding |
| Chromosomal Location | Xq28 |
| NCBI Gene ID | 1736 ncbi.nlm.nih.gov/gene/1736 |
| Ensembl ID | ENSG00000130826 |
| UniProt ID | O60832 |
| OMIM ID | 300126 |
| HGNC ID | 2890 |
| Aliases | DKCA1, DKC, NAP57, NOLA4, XAP101 |
Description
The DKC1 gene encodes dyskerin, a nucleolar protein essential for telomerase activity and ribosome biogenesis. Dyskerin is a core component of the H/ACA ribonucleoprotein (RNP) complex, which catalyzes pseudouridylation of ribosomal RNA and stabilizes the telomerase RNA component (TERC). Mutations in DKC1 cause X-linked dyskeratosis congenita (DC), a rare bone marrow failure syndrome characterized by mucocutaneous abnormalities, pulmonary fibrosis, and increased cancer risk. DKC1 is also implicated in Hoyeraal-Hreidarsson syndrome and other telomeropathies.
Disease Associations
| Disease category | Pathophysiological mechanism | Genomic evidence |
|---|---|---|
| Dyskeratosis congenita, X-linked | Loss-of-function mutations reduce dyskerin levels, impairing telomerase activity and leading to progressive telomere shortening, which causes stem cell failure and tissue dysfunction. | ClinVar; OMIM #305000 |
| Hoyeraal-Hreidarsson syndrome | Severe mutations (e.g., missense in conserved domains) cause profound telomerase deficiency, resulting in intrauterine growth retardation, microcephaly, and cerebellar hypoplasia. | OMIM #300240; ClinVar |
| Pulmonary fibrosis | DKC1 mutations predispose to idiopathic pulmonary fibrosis due to telomere dysfunction in alveolar epithelial cells. | ClinVar; literature (Armanios et al., 2007) |
| Aplastic anemia | Telomere erosion leads to hematopoietic stem cell exhaustion, manifesting as bone marrow failure. | ClinVar; OMIM |
| Cancer predisposition | Telomere dysfunction and genomic instability increase risk of squamous cell carcinoma and other malignancies. | COSMIC; literature |
Expression Profile
Tissue Expression
| Tissue | nTPM | level |
|---|---|---|
| Bone Marrow | High | High expression in hematopoietic tissues |
| Testis | High | High expression in germ cells |
| Thyroid | Medium | Moderate expression |
| Lung | Medium | Moderate expression |
| Liver | Low | Low expression |
| Brain | Low | Low expression |
Cell Line Expression
| Cell Line | nTPM | Notes |
|---|---|---|
| HeLa | High | Cervical carcinoma cell line; high proliferative activity |
| K562 | High | Chronic myeloid leukemia cell line |
| A549 | Medium | Lung carcinoma cell line |
| HepG2 | Low | Hepatocellular carcinoma cell line |
| MCF7 | Medium | Breast adenocarcinoma cell line |
Data source：Human Protein Atlas（proteinatlas.org）
Mutations & Variants
Hotspot Mutations
| Variant | Type | Frequency | Functional Description |
|---|---|---|---|
| c.1058C>T (p.Ala353Val) | Missense | ~10% of X-linked DC cases | Impairs dyskerin binding to TERC, reducing telomerase activity |
| c.1466A>G (p.His489Arg) | Missense | Rare | Disrupts pseudouridylation activity and telomerase function |
| c.361C>T (p.Arg121Trp) | Missense | Reported in Hoyeraal-Hreidarsson syndrome | Severe loss of function, leading to early-onset severe phenotype |
| c.1471C>T (p.Arg491Cys) | Missense | Rare | Affects protein stability and telomerase assembly |
| c.1150A>G (p.Thr384Ala) | Missense | Reported in pulmonary fibrosis | Partial loss of function, causing telomere shortening |
Mutation functional classification
Loss of Function (LOF)
Most DKC1 mutations are loss-of-function, reducing dyskerin protein levels or its ability to bind TERC, thereby impairing telomerase activity and leading to telomere shortening.
Gain of Function (GOF)
No gain-of-function mutations have been reported for DKC1.
Dominant Negative (DN)
Since DKC1 is X-linked, males are hemizygous; in females, skewed X-inactivation can lead to dominant-negative effects if the mutant allele is expressed in a subset of cells, but classic dominant-negative mechanisms are not established.
View complete mutation data：
Gene Ontology (GO)
| • pseudouridine synthase activity | • RNA binding |
| • telomerase activity | • ribosome biogenesis |
| • nucleolus | • H/ACA snoRNP complex |
| • telomere maintenance | • mRNA processing |
Pathways
• Telomere maintenance via telomerase
• rRNA pseudouridylation
• H/ACA RNP complex assembly
• Wnt signaling (via regulation of TERC)
• DNA damage response
Protein Summary
Dyskerin is a 514-amino acid nucleolar protein that contains a pseudouridine synthase domain and a PUA (pseudouridine synthase and archaeosine transglycosylase) domain. It is a core component of H/ACA snoRNPs, where it catalyzes the isomerization of uridine to pseudouridine in ribosomal RNA. Additionally, dyskerin binds to the telomerase RNA component (TERC) and is essential for telomerase stability and function. Through its dual roles, dyskerin links ribosome biogenesis and telomere maintenance, and its deficiency leads to cellular senescence and stem cell failure.
Related Services
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| DKC1 Knockout HEK293T Cell Line | EDJ-KQ78150 | Human | 1736 | Details Get a Quote |
| DKC1 Knockout HCT 116 Cell Line | EDJ-KQ78151 | Human | 1736 | Details Get a Quote |
Displaying Records 1 To 2 Of 2 Records
