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Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"<p>Purine nucleoside phosphorylase deficiency is caused by mutations in the PNP gene. The PNP gene provides instructions for making an enzyme called purine nucleoside phosphorylase. This enzyme is found throughout the body but is most active in specialized white blood cells called lymphocytes, which include T cells and B cells. Lymphocytes are produced in specialized lymphoid tissues, including the thymus and lymph nodes, and then released into the blood. The thymus is a gland located behind the breastbone; lymph nodes are found throughout the body. Lymphocytes in the blood and in lymphoid tissues are a major component of the immune system.</p><p>Purine nucleoside phosphorylase is known as a housekeeping enzyme because it clears away waste molecules that are generated when DNA is broken down. Mutations in the PNP gene reduce or eliminate the activity of purine nucleoside phosphorylase. The resulting excess of waste molecules and further reactions involving them lead to the buildup of a substance called deoxyguanosine triphosphate (dGTP) to levels that can be toxic to cells. Immature T cells in the thymus are particularly vulnerable to a toxic buildup of dGTP, which damages them and triggers their self-destruction (apoptosis). B cells and T cells in other lymphoid tissues can also be damaged. The shortage of T cells and sometimes B cells results in the immune problems characteristic of purine nucleoside phosphorylase deficiency. Damage to brain cells caused by buildup of dGTP is thought to underlie the neurological problems that occur in some people with purine nucleoside phosphorylase deficiency.</p><p class=\"section-source\"><a href=\"https://medlineplus.gov/genetics/condition/purine-nucleoside-phosphorylase-deficiency/#causes\">MedlinePlus Genetics: Causes</a></p>","key":"forms","title":"What causes Purine nucleoside phosphorylase deficiency?"},{"bodyHtml":"<p>People with purine nucleoside phosphorylase deficiency have low numbers of immune system cells called T cells, which normally recognize and attack foreign invaders to prevent infection. Some affected individuals also have low numbers of other immune system cells called B cells, which normally help fight infections by producing immune proteins called antibodies (or immunoglobulins). These proteins target foreign invaders and mark them for destruction. The most severely affected individuals, who lack T cells and B cells, have a serious condition called severe combined immunodeficiency (SCID).</p><p>The shortage of immune system cells in people with purine nucleoside phosphorylase deficiency results in repeated and persistent infections typically beginning in infancy or early childhood. Infections most commonly affect the sinuses and lungs. These infections are often caused by &quot;opportunistic&quot; organisms that ordinarily do not cause illness in people with a normal immune system. The infections can be very serious or life-threatening, and without successful treatment to restore immune function, children with purine nucleoside phosphorylase deficiency usually do not survive past childhood.</p><p>Infants with purine nucleoside phosphorylase deficiency typically grow more slowly than healthy babies. About two-thirds of individuals with this condition also have neurological problems, which may include developmental delay, intellectual disability, difficulty with balance and coordination (ataxia), and muscle stiffness (spasticity). People with purine nucleoside phosphorylase deficiency are also at increased risk of developing autoimmune disorders, which occur when the immune system malfunctions and attacks the body&#x27;s tissues and organs.</p><p class=\"section-source\">Source: <a href=\"https://medlineplus.gov/genetics/condition/purine-nucleoside-phosphorylase-deficiency\">MedlinePlus Genetics</a></p>","key":"overview","title":"Condition overview"}],"sharedSources":[],"slug":"purine-nucleoside-phosphorylase-deficiency","sourceDocuments":[{"name":"Purine nucleoside phosphorylase deficiency","reviewed":"2019-04","sections":{"causes":{"fetchedAt":"2026-10-20T20:24:35.408388+00:00","label":"Causes","pageSha256":"28d3f59aa433a99dc37e84aa00ce959a537816c47f6f2f6f42b00a9b91679734","sourceUrl":"https://medlineplus.gov/genetics/condition/purine-nucleoside-phosphorylase-deficiency/#causes","status":"available"}},"source_release":"2026-10-01","url":"https://medlineplus.gov/genetics/condition/purine-nucleoside-phosphorylase-deficiency"}],"sourceNote":"MedlinePlus descriptions and Causes; original HPO annotations.","takeawayHtml":"Cause explanations are from MedlinePlus Genetics. Feature values below retain their original sources and patient groups.","title":"Purine nucleoside phosphorylase deficiency"},"schemaVersion":1}