MBNL1
protein-codingmuscleblind like splicing regulator 1, the group of Zinc fingers CCCH-type
Gene summary
This gene encodes a member of the muscleblind protein family which was initially described in Drosophila melanogaster. The encoded protein is a C3H-type zinc finger protein that modulates alternative splicing of pre-mRNAs. Muscleblind proteins bind specifically to expanded dsCUG RNA but not to normal size CUG repeats and may thereby play a role in the pathophysiology of myotonic dystrophy. Mice lacking this gene exhibited muscle abnormalities and cataracts. Several alternatively spliced transcript variants have been described but the full-length natures of only some have been determined. The different isoforms are thought to have different binding specificities and/or splicing activities. [provided by RefSeq, Sep 2015]
- MBNL
MANE transcript
Inheritance
ClinVar variants
Top phenotype
gnomAD constraint
Max pathogenic AF
Genomic locus
External References & Databases
Transcript & Mutation Effects
hg38 • Region Span ~222.0 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 MBNL1 variants in ClinVar
ClinVar Variants & Pathogenicity by Type
Statistics based on transcript NM_021038.5. 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 | 4 | 1 | 5 | |||
| missense | 35 | 35 | ||||
| nonsense | 1 | 1 | ||||
| start loss | 0 | |||||
| frameshift | 0 | |||||
| splice donor/acceptor (+/-2bp) | 3 | 3 | ||||
| Total | 0 | 0 | 39 | 4 | 1 | 44 |
Transcript Catalog
Annotated transcript isoforms across RefSeq and Ensembl databases
| Transcript ID | Source | Protein ID | Coding Exons | MANE Status |
|---|---|---|---|---|
| RefSeq | NP_066368.2 | 8 | MANE Select | |
| Ensembl | ENSP00000319429.5 | 8 | MANE Select | |
| RefSeq | NP_001300986.1 | 9 | Standard | |
| RefSeq | NP_001350799.1 | 7 | Standard |
Gene Ontology (GO) Annotations & Pathways
Biological processes, molecular functions, cellular components and pathways
Pathways ConsensusPathDB
- miR-targeted genes in epithelium - TarBase
- miR-targeted genes in lymphocytes - TarBase
- miR-targeted genes in muscle cell - TarBase
- Adipogenesis
Biological Process
- regulation of alternative mRNA splicing, via spliceosome
- in utero embryonic development
- mRNA processing
- nervous system development
- RNA splicing
Molecular Function
- regulatory region RNA binding
- RNA binding
- double-stranded RNA binding
- protein binding
- metal ion binding
Cellular Component
- nucleus
- nucleoplasm
- cytoplasm
- cytosol
- cytoplasmic stress granule
gnomAD Constraint
Source:
- Gene type
- protein_coding
- Transcript type
- protein_coding
- Transcript
- ENST00000282486
- Coding exons
- 8
- Length
- 221953
- Individuals with no LoFs
- 125727
- Homozygous LoFs
- 0
- Heterozygous LoFs
- 4
- Defined
- 125731
- p
- 0.0000159
| Z-Score | Observed | Expected | Observed/Expected | Mutation Rate | Total Possible | |
|---|---|---|---|---|---|---|
| Missense | 2.70 | 114 | 229 | 0.498 | 0.0000126 | 2507 |
| Missense (PolyPhen) | 52 | 108.98 | 0.47715 | 1226 | ||
| Synonymous | 0.424 | 81 | 86.0 | 0.942 | 0.00000522 | 790 |
| Loss of Function | 3.50 | 4 | 21.5 | 0.186 | 0.00000133 | 217 |
Population LoF Frequency
| Population | CAF | p-value | Status |
|---|---|---|---|
| African | 0 | 0.0 | absent |
| Latino/Admixed American | 0 | 0.0 | absent |
| Ashkenazi Jewish | 0.000099 | 0.000099 | rare |
| East Asian | 0 | 0.0 | absent |
| Finnish | 0 | 0.0 | absent |
| European (Non-Finnish) | 0.000027 | 0.000026 | rare |
| South Asian | 0 | 0.0 | absent |
| Other | 0 | 0.0 | absent |
dbNSFP Gene Annotations
Source:
- Function
- FUNCTION: Mediates pre-mRNA alternative splicing regulation. Acts either as activator or repressor of splicing on specific pre-mRNA targets. Inhibits cardiac troponin-T (TNNT2) pre-mRNA exon inclusion but induces insulin receptor (IR) pre-mRNA exon inclusion in muscle. Antagonizes the alternative splicing activity pattern of CELF proteins. Regulates the TNNT2 exon 5 skipping through competition with U2AF2. Inhibits the formation of the spliceosome A complex on intron 4 of TNNT2 pre-mRNA. Binds to the stem-loop structure within the polypyrimidine tract of TNNT2 intron 4 during spliceosome assembly. Binds to the 5'-YGCU(U/G)Y- 3'consensus sequence. Binds to the IR RNA. Binds to expanded CUG repeat RNA, which folds into a hairpin structure containing GC base pairs and bulged, unpaired U residues. {ECO:0000269|PubMed:10970838, ECO:0000269|PubMed:15257297, ECO:0000269|PubMed:16946708, ECO:0000269|PubMed:18335541, ECO:0000269|PubMed:19470458}.;
- Disease
- DISEASE: Corneal dystrophy, Fuchs endothelial, 3 (FECD3) [MIM:613267]: A late-onset form of Fuchs endothelial corneal dystrophy, a disease caused by loss of endothelium of the central cornea. It is characterized by focal wart-like guttata that arise from Descemet membrane and develop in the central cornea, epithelial blisters, reduced vision and pain. Descemet membrane is thickened by abnormal collagenous deposition. {ECO:0000269|PubMed:25593321}. Note=The protein represented in this entry is involved in disease pathogenesis. In corneal endothelial cells from patients, MBNL1 is sequestered by TCF4 RNAs containing pathogenic CUG triplet repeat expansions. This results in missplicing of essential MBNL1-regulated mRNAs. {ECO:0000269|PubMed:25593321}.;
Recessive Scores
- pRec
- 0.250
Intolerance Scores
- LoFtool
- 0.159
- RVIS EVS
- -0.45
- RVIS percentile EVS
- 24
Essentials
- Essential (CRISPR)
- E
- Essential (CRISPR2)
- S
- Essential (gene trap)
- E
- Indispensability pred.
- E
- Indispensability score
- 0.967
Gene Damage Prediction
| All | Recessive | Dominant | |
|---|---|---|---|
| Mendelian | Medium | Medium | Medium |
| Primary Immunodeficiency | Medium | Medium | Medium |
| Cancer | Medium | Medium | Medium |