ERP44

Chr 9ADAR

endoplasmic reticulum protein 44

Also known as: PDIA10, TXNDC4

NCBI Gene: 23071ENSG00000023318UniProt: Q9BS26

This gene encodes a member of the protein disulfide isomerase (PDI) family of endoplasmic reticulum (ER) proteins. It has an inferred N-terminal signal peptide, a catalytically active thioredoxin (TRX) domain, two TRX-like domains and a C-terminal ER-retention sequence. This protein functions as a pH-regulated chaperone of the secretory pathway and likely plays a role in protein quality control at the endoplasmic reticulum - Golgi interface. [provided by RefSeq, Dec 2016]

Primary Disease Associations & Inheritance

Gillespie syndromeMIM #206700
ADAR
Spinocerebellar ataxia 15MIM #606658
AD
Spinocerebellar ataxia 29, congenital nonprogressiveMIM #117360
AD
0
Active trials
35
Pathogenic / LP
80
ClinVar variants
1
Pubs (1 yr)
2.3
Missense Z
0.27
LOEUF· LoF intolerant
Clinical Summary— ERP44
⚡
Population Constraint (gnomAD)
Highly constrained gene — heterozygous loss-of-function variants are very rare in the population (pLI 0.99). One damaged copy is likely sufficient to cause disease.
📋
ClinVar Variants
35 Pathogenic / Likely Pathogenic· 44 VUS of 80 total submissions
📖
GeneReview available — ERP44
Authoritative clinical overview · Recommended first read
Open GeneReview ↗

Population Genetics & Constraint

gnomAD v4 — loss-of-function & missense intolerance

gnomAD
LoF intolerant — likely haploinsufficient
LoF Constraint?LOEUF (Loss-of-function Observed/Expected Upper bound Fraction) is the upper bound of the 90% CI for LoF OE — the preferred gnomAD v4 metric. Lower = more intolerant to LoF. LOEUF < 0.35 = highly constrained.
0.27LOEUF
pLI 0.991
Z-score 4.05
OE 0.09 (0.04–0.27)
Highly constrained

Highly LoF-intolerant (top ~10% of genes)

Missense Constraint?Missense Z-score: standard deviations fewer missense variants observed vs. expected. Z > 3.09 (p < 0.001) = gene does not tolerate missense variation. OE missense < 0.6 is also considered constrained.
2.29Z-score
OE missense 0.56 (0.48–0.65)
120 obs / 214.1 exp
Mild constraint

Moderately missense-constrained (top ~2.5%)

Observed / Expected Ratios?Shaded band = 90% confidence interval. Vertical tick = point estimate. Grey threshold line = gnomAD constraint cutoff for that variant class.
LoF OE?Ratio of observed to expected LoF variants. Upper CI bound (LOEUF) ≤ 0.35 = strong LoF constraint signal.0.09 (0.04–0.27)
0≤0.351.4
Missense OE?Ratio of observed to expected missense variants. OE ≤ 0.6 = fewer missense variants than expected by chance.0.56 (0.48–0.65)
0≤0.61.4
Synonymous OE?Control metric — synonymous variants are largely neutral and expected near OE = 1.0. Significant deviation may indicate annotation issues.1.02
0≤1.21.6
LoF obs/exp: 2 / 23.0Missense obs/exp: 120 / 214.1Syn Z: -0.11

ClinVar Variant Classifications

80 submitted variants in ClinVar

ClinVar

Classification Summary

Pathogenic31
Likely Pathogenic4
VUS44
Likely Benign1
31
Pathogenic
4
Likely Pathogenic
44
VUS
1
Likely Benign

Curated Variants Distribution

Classified variants from ClinVar · 5 ACMG categories

ClassificationLoFMissense + InframeNon-codingSynonymousTotal
Pathogenic
0
0
31
0
31
Likely Pathogenic
0
0
4
0
4
VUS
0
38
6
0
44
Likely Benign
0
1
0
0
1
Benign
0
0
0
0
0
Total03941080

LoF = frameshift, stop gained/lost, canonical splice · Counts from ClinVar esearch · Updated hourly

View in ClinVar →

Protein Context — Lollipop Plot

ERP44 · protein map & ClinVar variants

Showing all ClinVar variants across the protein. Search a specific variant to highlight its position.

Clinical Trials

Active and recruiting trials from ClinicalTrials.gov

ClinicalTrials.gov

No active trials found for this gene.

Search ClinicalTrials.gov →
Clinical Literature
Landmark / reviewRecent case evidence
Full-Text Mentions
NLP-detected gene mentions in article bodies · via PubTator3
PubTator3
Top 5 full-text resultsSearch PubTator3 ↗
Key Publications
Landmark & review papers · by relevance
PubMed
Top 4 results · since 2015Search PubMed ↗
Recent Gene-Specific Literature
Gene in title · MEDLINE · newest first
Europe PMC
Top 5 resultsSearch Europe PMC ↗

External Resources

Links to major genomics databases and tools

Franklin by Genoox
AI-powered variant curation and clinical analysis
DECIPHER
Genomic variants and phenotypes in rare disease patients