TMEM256

protein-coding

transmembrane protein 256

Gene summary

Located in extracellular exosome and mitochondrion. [provided by Alliance of Genome Resources, Jul 2025]

Previous symbols:
  • C17orf61

MANE transcript

NM_152766.5

Inheritance

—

ClinVar variants

P:1U:19B:2

Top phenotype

Asphyxiating thoracic dystrophy 3

gnomAD constraint

pLI —, LoF o/e 0.88

Max pathogenic AF

—

Genomic locus

chr17:7,402,975-7,404,097

External References & Databases

Transcript & Mutation Effects

hg38 • Region Span ~1.1 kb
Loading mutation effect viewer...

GenCC 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 TMEM256 variants in ClinVar

3 Conditions Cataloged
not specifiedTotal: 19
not providedTotal: 2
Asphyxiating thoracic dystrophy 3Total: 1

ClinVar Variants & Pathogenicity by Type

Statistics based on transcript NM_152766.5. 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.

EffectPLPVUSLBBSum
synonymous
0
missense
18
clinvar
2
clinvar
20
nonsense
0
start loss
0
frameshift
1
clinvar
1
splice donor/acceptor (+/-2bp)
1
clinvar
1
Total01192022
Loading ClinVar variants...

Transcript Catalog

Annotated transcript isoforms across RefSeq and Ensembl databases

Showing 4 of 14 transcripts
Transcript IDSourceProtein IDCoding ExonsMANE Status
NM_152766.5RefSeqNP_689979.14MANE Select
ENST00000302422.4EnsemblENSP00000301939.34MANE Select
ENST00000576017.1EnsemblENSP00000468314.12Standard
ENST00000959765.1EnsemblENSP00000629824.14Standard

Gene Ontology (GO) Annotations & Pathways

Biological processes, molecular functions, cellular components and pathways

Biological Process

  • biological_process

Molecular Function

  • molecular_function

Cellular Component

  • integral component of membrane
  • extracellular exosome

gnomAD Constraint

Source: gnomAD

Gene type
protein_coding
Transcript type
protein_coding
Transcript
ENST00000302422
Coding exons
4
Length
1163
Individuals with no LoFs
125730
Homozygous LoFs
0
Heterozygous LoFs
18
Defined
125748
p
0.0000716
Z-ScoreObservedExpectedObserved/ExpectedMutation RateTotal Possible
Missense0.1835457.90.9320.00000263695
Missense (PolyPhen)1214.4740.82908185
Synonymous0.4882427.20.8810.00000140238
Loss of Function0.25855.660.8832.39e-771

Population LoF Frequency

PopulationCAFp-valueStatus
African0.000550.00031rare
Latino/Admixed American00.0absent
Ashkenazi Jewish00.0absent
East Asian0.000170.00016rare
Finnish00.0absent
European (Non-Finnish)0.0000790.000079rare
South Asian0.0000330.000033rare
Other00.0absent

dbNSFP Gene Annotations

Source: dbNSFP

Recessive Scores

pRec
0.104

Intolerance Scores

RVIS EVS
0.48
RVIS percentile EVS
78.95

Essentials

Essential (CRISPR)
N
Essential (CRISPR2)
N
Essential (gene trap)
N

Gene Damage Prediction

AllRecessiveDominant
MendelianMediumMediumMedium
Primary ImmunodeficiencyMediumMediumMedium
CancerMediumMediumMedium
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