MRPS18B
protein-codingmitochondrial ribosomal protein S18B, the group of Small subunit mitochondrial ribosomal proteins|Mitochondrial ribosomal proteins
Gene summary
Mammalian mitochondrial ribosomal proteins are encoded by nuclear genes and help in protein synthesis within the mitochondrion. Mitochondrial ribosomes (mitoribosomes) consist of a small 28S subunit and a large 39S subunit. They have an estimated 75% protein to rRNA composition compared to prokaryotic ribosomes, where this ratio is reversed. Another difference between mammalian mitoribosomes and prokaryotic ribosomes is that the latter contain a 5S rRNA. Among different species, the proteins comprising the mitoribosome differ greatly in sequence, and sometimes in biochemical properties, which prevents easy recognition by sequence homology. This gene encodes a 28S subunit protein that belongs to the ribosomal protein S18P family. The encoded protein is one of three that has significant sequence similarity to bacterial S18 proteins. The primary sequences of the three human mitochondrial S18 proteins are no more closely related to each other than they are to the prokaryotic S18 proteins. Pseudogenes corresponding to this gene are found on chromosomes 1q and 2q. [provided by RefSeq, Jul 2008]
MANE transcript
Inheritance
ClinVar variants
Top phenotype
gnomAD constraint
Max pathogenic AF
Genomic locus
External References & Databases
Transcript & Mutation Effects
hg38 • Region Span ~8.6 kbGenCC Phenotypes & Disease Associations
Curated gene-disease validity assertions and inheritance patterns
No GenCC data available for this gene.
ClinVar Associated Diseases & Phenotypes
Reported disease conditions connected to MRPS18B variants in ClinVar
ClinVar Variants & Pathogenicity by Type
Statistics based on transcript NM_014046.4. Only rare variants are included.
We include only reliable ClinVar variants with their consequences to MANE Select, MANE Plus Clinical transcripts, or transcripts with TSL equal to 1. Click a count to filter the variants table below.
Slight differences between displayed counts and ClinVar may occur due to a different transcript/consequence chosen by our variant effect predictor, or because we classify Benign/Likely benign as Likely benign and Pathogenic/Likely pathogenic as Likely pathogenic.
| Effect | PathogenicP | Likely pathogenicLP | VUS | Likely benignLB | BenignB | Sum |
|---|---|---|---|---|---|---|
| synonymous | 1 | 1 | 2 | |||
| missense | 41 | 6 | 47 | |||
| nonsense | 0 | |||||
| start loss | 0 | |||||
| frameshift | 0 | |||||
| splice donor/acceptor (+/-2bp) | 3 | 3 | ||||
| Total | 0 | 0 | 45 | 7 | 0 | 52 |
Transcript Catalog
Annotated transcript isoforms across RefSeq and Ensembl databases
| Transcript ID | Source | Protein ID | Coding Exons | MANE Status |
|---|---|---|---|---|
| RefSeq | NP_054765.1 | 7 | MANE Select | |
| Ensembl | ENSP00000259873.4 | 7 | MANE Select | |
| Ensembl | ENSP00000525010.1 | 6 | Standard | |
| Ensembl | ENSP00000525010.1 | 6 | Standard |
Model Organisms & Knockout Phenotypes
Observed phenotypic effects in mouse and zebrafish models
| Gene / Model | Organism | Observed Phenotype |
|---|---|---|
| mrps18b | Danio rerio | Structure: whole organism Quality: decreased size abnormal |
Gene Ontology (GO) Annotations & Pathways
Biological processes, molecular functions, cellular components and pathways
Pathways ConsensusPathDB
- Viral carcinogenesis - Homo sapiens (human)
- Mitochondrial translation initiation
- Translation
- Metabolism of proteins
- Mitochondrial translation elongation
Biological Process
- translation
- mitochondrial translation
- mitochondrial translational elongation
- mitochondrial translational termination
Molecular Function
- structural constituent of ribosome
- protein binding
Cellular Component
- nucleoplasm
- mitochondrion
- mitochondrial inner membrane
- mitochondrial small ribosomal subunit
- cell junction
gnomAD Constraint
Source:
- Gene type
- protein_coding
- Transcript type
- protein_coding
- Transcript
- ENST00000259873
- Coding exons
- 7
- Length
- 8687
- Individuals with no LoFs
- 125722
- Homozygous LoFs
- 0
- Heterozygous LoFs
- 26
- Defined
- 125748
- p
- 0.000103
| Z-Score | Observed | Expected | Observed/Expected | Mutation Rate | Total Possible | |
|---|---|---|---|---|---|---|
| Missense | -0.161 | 167 | 161 | 1.04 | 0.00000966 | 1647 |
| Missense (PolyPhen) | 50 | 49.051 | 1.0194 | 468 | ||
| Synonymous | -0.810 | 66 | 58.1 | 1.14 | 0.00000304 | 533 |
| Loss of Function | 1.50 | 9 | 15.4 | 0.586 | 8.07e-7 | 158 |
Population LoF Frequency
| Population | CAF | p-value | Status |
|---|---|---|---|
| African | 0.00044 | 0.00043 | rare |
| Latino/Admixed American | 0.00012 | 0.00012 | rare |
| Ashkenazi Jewish | 0.00010 | 0.000099 | rare |
| East Asian | 0.00011 | 0.00011 | rare |
| Finnish | 0 | 0.0 | absent |
| European (Non-Finnish) | 0.000054 | 0.000053 | rare |
| South Asian | 0.00020 | 0.00020 | rare |
| Other | 0 | 0.0 | absent |
dbNSFP Gene Annotations
Source:
Intolerance Scores
- LoFtool
- 0.886
- RVIS EVS
- -0.05
- RVIS percentile EVS
- 50.01
Essentials
- Essential (CRISPR)
- E
- Essential (CRISPR2)
- E
- Essential (gene trap)
- E
- Indispensability pred.
- E
- Indispensability score
- 0.989
Gene Damage Prediction
| All | Recessive | Dominant | |
|---|---|---|---|
| Mendelian | Medium | Medium | Medium |
| Primary Immunodeficiency | Medium | Medium | Medium |
| Cancer | Medium | Medium | Medium |