MRPL12: Mitochondrial Ribosomal Protein L12
A key component of the mitochondrial large ribosomal subunit involved in mitochondrial translation and oxidative phosphorylation.
Gene Information Card
| Symbol | MRPL12 |
|---|---|
| Full Name | Mitochondrial Ribosomal Protein L12 |
| Gene Type | Protein coding |
| Chromosomal Location | 17q25.3 |
| NCBI Gene ID | 6182 ncbi.nlm.nih.gov/gene/6182 |
| Ensembl ID | ENSG00000108848 |
| UniProt ID | P52815 |
| OMIM ID | 602375 |
| HGNC ID | 7585 |
| Aliases | L12mt, MRP-L12, RPML12, 5c5-2 |
Description
MRPL12 encodes a mitochondrial ribosomal protein (L12) that is a component of the large 39S subunit of the mitochondrial ribosome. This protein is essential for mitochondrial translation, which produces 13 subunits of the oxidative phosphorylation (OXPHOS) system. MRPL12 also has a role in mitochondrial transcription regulation by interacting with mitochondrial RNA polymerase (POLRMT). Mutations in MRPL12 are associated with combined oxidative phosphorylation deficiency and mitochondrial disease.
Disease Associations
| Disease category | Pathophysiological mechanism | Genomic evidence |
|---|---|---|
| Combined oxidative phosphorylation deficiency 36 (COXPD36) | Loss-of-function mutations impair mitochondrial translation, reducing OXPHOS complex assembly and activity. | ClinVar, OMIM #619025 |
| Mitochondrial complex I deficiency, nuclear type | Defective mitochondrial translation leads to reduced complex I subunit synthesis. | ClinVar, OMIM #252010 |
| Leigh syndrome | Severe mitochondrial dysfunction due to impaired translation can present as Leigh-like phenotype. | ClinVar, PubMed |
Expression Profile
Tissue Expression
| Tissue | nTPM | level |
|---|---|---|
| Heart | 12.5 | High |
| Skeletal muscle | 10.8 | High |
| Liver | 8.2 | Medium |
| Brain | 7.1 | Medium |
| Kidney | 6.9 | Medium |
| Lung | 5.4 | Low |
Cell Line Expression
| Cell Line | nTPM | Notes |
|---|---|---|
| HeLa | 14.2 | High expression |
| HEK293 | 12.8 | High expression |
| K562 | 9.5 | Medium expression |
| HepG2 | 8.1 | Medium expression |
| SH-SY5Y | 6.7 | Low expression |
Data source：Human Protein Atlas（proteinatlas.org）
Mutations & Variants
Hotspot Mutations
| Variant | Type | Frequency | Functional Description |
|---|---|---|---|
| c.542G>A (p.Arg181Gln) | Missense | Rare | Impaired mitochondrial translation, reduced OXPHOS activity |
| c.1A>G (p.Met1?) | Start loss | Very rare | Complete loss of protein, severe COXPD36 |
| c.287_288del (p.Glu96Glyfs*12) | Frameshift | Rare | Loss of function, mitochondrial disease |
Mutation functional classification
Loss of Function (LOF)
Missense, nonsense, frameshift, and start-loss mutations that reduce or abolish MRPL12 protein function, leading to impaired mitochondrial translation and OXPHOS deficiency.
Gain of Function (GOF)
No gain-of-function mutations reported.
Dominant Negative (DN)
No dominant-negative mutations reported; all known pathogenic variants are recessive.
View complete mutation data：
Gene Ontology (GO)
Pathways
• Mitochondrial translation (REACT:1000)
• Oxidative phosphorylation (KEGG:00190)
• Organelle biogenesis and maintenance (Reactome: R-HSA-1852241)
Protein Summary
MRPL12 is a 198-amino-acid protein (22 kDa) localized to the mitochondrial matrix. It forms part of the 39S large ribosomal subunit, interacting with rRNA and other ribosomal proteins to facilitate mRNA translation. MRPL12 also binds to POLRMT and stimulates mitochondrial transcription, linking translation and transcription. The protein contains a conserved ribosomal L12 domain and is ubiquitously expressed, with highest levels in heart and skeletal muscle.
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