ENPP1 — ectonucleotide pyrophosphatase/phosphodiesterase 1

32 sources retrieved · Most recent: April 2026 · Index updated 3 months ago

279PubMed Papers

#1,296 · top 7% of 19K genes

25Diseases

#84 · top 0.4%

0Drugs

98Pathogenic Variants

top 14%

OMIM Disease GeneHub GeneTrendingVariant-RichExperimental GO EvidenceSwiss-Prot Reviewed

negative regulation of insulin receptor signaling pathwayphosphate-containing compound metabolic processnucleoside triphosphate catabolic processgene expressionarterial calcification, generalized, of infancy, 1hypopigmentation-punctate palmoplantar keratoderma syndromeGeneralized arterial calcification of infancyhypophosphatemic rickets, autosomal recessive, 2

AI Summary

ENPP1 is an ectonucleotide pyrophosphatase/phosphodiesterase that generates pyrophosphate (PPi) by hydrolyzing extracellular ATP and other nucleotides, with critical roles in mineralization and immune regulation 1. In bone homeostasis, ENPP1-generated PPi inhibits mineralization by preventing hydroxyapatite crystal growth, while also regulating osteoblast differentiation through histone lactylation pathways 2. ENPP1 uniquely hydrolyzes the immunotransmitter 2'3'-cGAMP, suppressing cGAS-STING antitumor immunity—a mechanism exploited by tumor cells through both membrane-bound and exosomal ENPP1 to evade immune surveillance 3 4. ENPP1 also impairs insulin signaling and blood-brain barrier integrity, promoting brain metastasis in HER2+ breast cancer 5. Loss-of-function mutations cause paradoxical mineralization disorders: osteoporosis with concurrent vascular calcification (arterial calcification of infancy, hypophosphatemic rickets) 6 1. Conversely, the K121Q polymorphism increases insulin resistance risk and type 2 diabetes susceptibility 7. ENPP1 represents both a disease target (cGAMP hydrolysis inhibition for cancer immunotherapy) and therapeutic ligand (ENPP1 replacement for calcification disorders), making it clinically significant across metabolic, skeletal, vascular, and oncologic domains.

Sources cited

ENPP1 hydrolyzes ATP to generate pyrophosphate and is involved in mineralization disorders

PMID: 37871131

ENPP1 is regulated by histone lactylation and contributes to osteoblast differentiation

PMID: 37752768

Tumor exosomal ENPP1 hydrolyzes cGAMP to inhibit cGAS-STING pathway

PMID: 38498770

ENPP1 in cancer and normal tissues dampens cGAMP-STING antitumoral immunity

PMID: 38117852

Tumor-secreted ENPP1 impairs blood-brain barrier integrity and promotes brain metastasis through insulin signaling disruption

PMID: 39210244

ENPP1 mutations cause arterial calcification of infancy, hypophosphatemic rickets, and Cole disease

PMID: 35475527

ENPP1 K121Q polymorphism associates with insulin resistance and type 2 diabetes

PMID: 17563456

Disease Associations25

arterial calcification, generalized, of infancy, 1Open Targets

0.84Strong

hypopigmentation-punctate palmoplantar keratoderma syndromeOpen Targets

0.81Strong

Generalized arterial calcification of infancyOpen Targets

0.81Strong

hypophosphatemic rickets, autosomal recessive, 2Open Targets

0.77Strong

type 2 diabetes mellitusOpen Targets

0.65Moderate

ossification of the posterior longitudinal ligament of the spineOpen Targets

0.56Moderate

inherited obesityOpen Targets

0.53Moderate

obesityOpen Targets

0.45Moderate

arterial calcification of infancyOpen Targets

0.43Moderate

autosomal recessive hypophosphatemic ricketsOpen Targets

0.42Moderate

crystal arthropathyOpen Targets

0.42Moderate

osteoarthritis, handOpen Targets

0.41Moderate

chondrocalcinosisOpen Targets

0.40Weak

Pseudoxanthoma elasticumOpen Targets

0.38Weak

pseudoxanthoma elasticum (inherited or acquired)Open Targets

0.38Weak

calcific tendinitisOpen Targets

0.36Weak

hypophosphatemic ricketsOpen Targets

0.35Weak

placenta praeviaOpen Targets

0.31Weak

pericarditisOpen Targets

0.28Weak

dystonia 28, childhood-onsetOpen Targets

0.27Weak

Arterial calcification of infancy, generalized, 1UniProt

Cole diseaseUniProt

Hypophosphatemic rickets, autosomal recessive, 2UniProt

Ossification of the posterior longitudinal ligament of the spineUniProt

Type 2 diabetes mellitusUniProt

Pathogenic Variants98

NM_006208.3(ENPP1):c.1412A>G (p.Tyr471Cys)Pathogenic

not provided|ENPP1-related disorder

★★☆☆2026→ Residue 471

NM_006208.3(ENPP1):c.1756G>A (p.Gly586Arg)Pathogenic

Arterial calcification, generalized, of infancy, 1|not provided|Type 2 diabetes mellitus;Arterial calcification, generalized, of infancy, 1;Hypopigmentation-punctate palmoplantar keratoderma syndrome;Inherited obesity;Hypophosphatemic rickets, autosomal recessive, 2|Autosomal recessive ENPP1-related disorders

★★☆☆2025→ Residue 586

NM_006208.3(ENPP1):c.1441C>T (p.Arg481Trp)Pathogenic

Hypophosphatemic rickets, autosomal recessive, 2;Arterial calcification, generalized, of infancy, 1|Arterial calcification, generalized, of infancy, 1|Hypophosphatemic rickets, autosomal recessive, 2|not provided|Type 2 diabetes mellitus;Hypophosphatemic rickets, autosomal recessive, 2;Arterial calcification, generalized, of infancy, 1;Hypopigmentation-punctate palmoplantar keratoderma syndrome;Inherited obesity

★★☆☆2025→ Residue 481

NM_006208.3(ENPP1):c.913C>A (p.Pro305Thr)Pathogenic

Arterial calcification, generalized, of infancy, 1|not provided|ENPP1-related disorder|Type 2 diabetes mellitus;Hypopigmentation-punctate palmoplantar keratoderma syndrome;Hypophosphatemic rickets, autosomal recessive, 2;Inherited obesity;Arterial calcification, generalized, of infancy, 1

★★☆☆2025→ Residue 305

NM_006208.3(ENPP1):c.749C>T (p.Pro250Leu)Pathogenic

not provided|ENPP1-related disorder

★★☆☆2025→ Residue 250

NM_006208.3(ENPP1):c.2192del (p.Asn731fs)Pathogenic

Hypophosphatemic rickets, autosomal recessive, 2;Arterial calcification, generalized, of infancy, 1|not provided

★★☆☆2025→ Residue 731

NM_006208.3(ENPP1):c.2677G>T (p.Glu893Ter)Pathogenic

Arterial calcification, generalized, of infancy, 1|not provided|Arterial calcification, generalized, of infancy, 1;Hypophosphatemic rickets, autosomal recessive, 2

★★☆☆2025→ Residue 893

NM_006208.3(ENPP1):c.715+1G>CPathogenic

not provided

★★☆☆2025

NM_006208.3(ENPP1):c.313+1G>APathogenic

Hypopigmentation-punctate palmoplantar keratoderma syndrome;Inherited obesity;Type 2 diabetes mellitus;Arterial calcification, generalized, of infancy, 1;Hypophosphatemic rickets, autosomal recessive, 2|ENPP1-related disorder

★★☆☆2025

NM_006208.3(ENPP1):c.574del (p.Glu192fs)Pathogenic

Hypophosphatemic rickets, autosomal recessive, 2;Arterial calcification, generalized, of infancy, 1|not provided

★★☆☆2025→ Residue 192

NM_006208.3(ENPP1):c.26dup (p.Gly10fs)Pathogenic

Hypophosphatemic rickets, autosomal recessive, 2;Arterial calcification, generalized, of infancy, 1|ENPP1-related disorder

★★☆☆2024→ Residue 10

NM_006208.3(ENPP1):c.2344C>T (p.Arg782Ter)Pathogenic

Type 2 diabetes mellitus;Arterial calcification, generalized, of infancy, 1;Obesity;Hypophosphatemic rickets, autosomal recessive, 2;Hypopigmentation-punctate palmoplantar keratoderma syndrome|ENPP1-related disorder|not provided

★★☆☆2024→ Residue 782

NM_006208.3(ENPP1):c.2596G>A (p.Glu866Lys)Likely pathogenic

★★☆☆2024→ Residue 866

NM_006208.3(ENPP1):c.1426C>T (p.Arg476Ter)Pathogenic

★★☆☆2024→ Residue 476

NM_006208.3(ENPP1):c.2375A>G (p.Asn792Ser)Pathogenic

★★☆☆2024→ Residue 792

NM_006208.3(ENPP1):c.2631G>A (p.Trp877Ter)Pathogenic

not provided|Arterial calcification, generalized, of infancy, 1;Type 2 diabetes mellitus;Hypopigmentation-punctate palmoplantar keratoderma syndrome;Inherited obesity;Hypophosphatemic rickets, autosomal recessive, 2

★★☆☆2024→ Residue 877

NM_006208.3(ENPP1):c.1366C>T (p.Arg456Ter)Pathogenic

Type 2 diabetes mellitus|Arterial calcification, generalized, of infancy, 1;Type 2 diabetes mellitus;Hypophosphatemic rickets, autosomal recessive, 2;Inherited obesity;Hypopigmentation-punctate palmoplantar keratoderma syndrome

★★☆☆2024→ Residue 456

NM_006208.3(ENPP1):c.2608-1G>ALikely pathogenic

not provided|Arterial calcification, generalized, of infancy, 1;Hypopigmentation-punctate palmoplantar keratoderma syndrome;Inherited obesity;Hypophosphatemic rickets, autosomal recessive, 2;Type 2 diabetes mellitus

★★☆☆2024

NM_006208.3(ENPP1):c.1025G>T (p.Gly342Val)Pathogenic

Arterial calcification, generalized, of infancy, 1|Coronary sclerosis, medial, of infancy|not provided

★★☆☆2021→ Residue 342

NM_006208.3(ENPP1):c.936T>G (p.Tyr312Ter)Pathogenic

ENPP1-related disorder

★☆☆☆2026→ Residue 312

Tissue Expression6 tissues

Liver

100%

Ovary

30%

Heart

Lung

Brain

Bone Marrow

Gene Interaction Network6 neighbors

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Structure7 PDB hits

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PDB6WFJ · 2.50 Å · X-ray

View on RCSB

ConstraintgnomAD v4.1

LOEUFⓘ

0.73LoF Tolerant

pLIⓘ

0.00Tolerant

Observed/Expected LoF0.54 [0.41–0.73]

Rankings3 dim

Where ENPP1 stands among ~20K protein-coding genes

#1,295of 20,598
Most Researched279 · top 10%
#794of 5,509
Most Pathogenic Variants98 · top quartile
#5,670of 17,882
Most Constrained (LOEUF)0.73