Home > Gene Browser > PNP

PNP

Synonyms
NP, PRO1837, PUNP
External resources
Summary
This gene encodes an enzyme which reversibly catalyzes the phosphorolysis of purine nucleosides. The enzyme is trimeric, containing three identical subunits. Mutations which result in nucleoside phosphorylase deficiency result in defective T-cell (cell-mediated) immunity but can also affect B-cell immunity and antibody responses. Neurologic disorders may also be apparent in patients with immune defects. A known polymorphism at aa position 51 that does not affect enzyme activity has been described. A pseudogene has been identified on chromosome 2.

Variant counts

The variants found in rare patients tested by 3billion are classified and counted according to ACMG guidelines. The variants with over 5% variant frequency in population genome databases ( gnomAD, dbSNP, etc) are excluded.

Pathogenic
10
Likely pathogenic
1
VUS
835
Likely benign
1,046
Benign
42

Patient phenotypes

Proportions of phenotypes among 3 patients carrying pathogenic or likely pathogenic variants on PNP gene are displayed below.

Phenotype class
Patients in 3billion (%)
Abnormality of head or neck
33.3%
Abnormality of the cardiovascular system
33.3%
Abnormality of the digestive system
33.3%
Abnormality of the nervous system
33.3%
Abnormality of the respiratory system
33.3%
Abnormal cellular phenotype
0%
Abnormality of blood and blood-forming tissues
0%
Abnormality of limbs
0%
Abnormality of metabolism homeostasis
0%
Abnormality of prenatal development or birth
0%
Abnormality of the breast
0%
Abnormality of the ear
0%
Abnormality of the endocrine system
0%
Abnormality of the eye
0%
Abnormality of the genitourinary system
0%
Abnormality of the immune system
0%
Abnormality of the integument
0%
Abnormality of the musculoskeletal system
0%
Abnormality of the thoracic cavity
0%
Abnormality of the voice
0%
Constitutional symptom
0%
Growth abnormality
0%
Neoplasm
0%

Have a question or need assistance? Ask here.

Send us your questions or comments related to the variant counts and/or patient phenotypes