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Pyruvate kinase deficiency of red cells
Red cell pyruvate kinase deficiency, or congenital nonspherocytic hemolyic anemia-2 (CNSHA2), is the most common cause of hereditary nonspherocytic hemolytic anemia. PK deficiency is also the most frequent enzyme abnormality of the glycolytic pathway (Zanella et al., 2005). [from OMIM]
Majeed syndrome
Majeed syndrome (MJDS) is an autosomal recessive pediatric multisystem autoinflammatory disorder characterized by chronic recurrent multifocal osteomyelitis (CRMO) and congenital dyserythropoietic anemia; some patients may also develop neutrophilic dermatosis. Additional features may include fever, failure to thrive, and neutropenia. Laboratory studies show elevated inflammatory markers consistent with activation of the proinflammatory IL1 (147760) pathway (summary by Ferguson and El-Shanti, 2021). Genetic Heterogeneity of Chronic Recurrent Multifocal Osteomyelitis See also CRMO2 (612852), caused by mutation in the IL1RN gene (147679) on chromosome 2q14; and CRMO3 (259680), caused by mutation in the IL1R1 gene (147810) on chromosome 2q12. [from OMIM]
Glycogen storage disease due to phosphoglycerate kinase 1 deficiency
Phosphoglycerate kinase-1 deficiency is an X-linked recessive condition with a highly variable clinical phenotype that includes hemolytic anemia, myopathy, and neurologic involvement. Patients can express 1, 2, or all 3 of these manifestations (Shirakawa et al., 2006). [from OMIM]
Myopathy, lactic acidosis, and sideroblastic anemia 1
Myopathy, lactic acidosis, and sideroblastic anemia (MLASA) is a rare autosomal recessive oxidative phosphorylation disorder specific to skeletal muscle and bone marrow (Bykhovskaya et al., 2004). Genetic Heterogeneity of Myopathy, Lactic Acidosis, and Sideroblastic Anemia MLASA2 (613561) is caused by mutation in the YARS2 gene (610957) on chromosome 12p11. MLASA3 (500011) is caused by heteroplasmic mutation in the mitochondrially-encoded MTATP6 gene (516060). [from OMIM]
X-linked sideroblastic anemia with ataxia
X-linked spinocerebellar ataxia-6 with or without sideroblastic anemia (SCAX6) is an X-linked recessive disorder characterized by delayed motor development apparent in infancy with delayed walking (often by several years) due to ataxia and poor coordination. Additional features may include dysmetria, dysarthria, spasticity of the lower limbs, hyperreflexia, dysdiadochokinesis, strabismus, and nystagmus. The disorder is slowly progressive, and patients often lose ambulation. Brain imaging usually shows cerebellar atrophy. Most affected individuals have mild hypochromic, microcytic sideroblastic anemia, which may be asymptomatic. Laboratory studies show increased free erythrocyte protoporphyrin (FEP) and ringed sideroblasts on bone marrow biopsy. Female carriers do not have neurologic abnormalities, but may have subtle findings on peripheral blood smear (Pagon et al., 1985; D'Hooghe et al., 2012). For a discussion of genetic heterogeneity of X-linked spinocerebellar ataxia (SCAX), see SCAX1 (302500). [from OMIM]
Congenital dyserythropoietic anemia type type 1B
Congenital dyserythropoietic anemia type I (CDA I) is characterized by moderate-to-severe macrocytic anemia presenting occasionally in utero as severe anemia associated with hydrops fetalis but more commonly in neonates as hepatomegaly, early jaundice, and intrauterine growth restriction. Some individuals present in childhood or adulthood. After the neonatal period, most affected individuals have lifelong moderate anemia, usually accompanied by jaundice and splenomegaly. Secondary hemochromatosis develops with age as a result of increased iron absorption even in those who are not transfused. Distal limb anomalies occur in 4%-14% of affected individuals. [from GeneReviews]
Congenital dyserythropoietic anemia type 4
Congenital dyserythropoietic anemia type IVa (CDAN4A) is an autosomal dominant red blood cell disorder characterized by ineffective erythropoiesis and hemolysis resulting in anemia. Circulating erythroblasts and erythroblasts in the bone marrow show various morphologic abnormalities. Affected individuals with CDAN4A also have increased levels of fetal hemoglobin (summary by Arnaud et al., 2010). For a discussion of genetic heterogeneity of congenital dyserythropoietic anemia, see CDAN1 (224120). [from OMIM]
Sideroblastic anemia 3
Sideroblastic anemia-3 is an autosomal recessive hematologic disorder characterized by onset of anemia in adulthood. Affected individuals show signs of systemic iron overload, and iron chelation therapy may be of clinical benefit (summary by Liu et al., 2014). For a discussion of genetic heterogeneity of sideroblastic anemia, see SIDBA1 (300751). [from OMIM]
Erythroleukemia, familial, susceptibility to
Familial erythroleukemia (FERLK) is a leukemic or preleukemic state in which red cell proliferation is the predominant feature. Hematologic characteristics include particularly ineffective and hyperplastic erythropoiesis with megaloblastic components accompanied by myeloblastic proliferation of varying degree (Park et al., 2002). Park et al. (2002) discussed the evolution of the definition of 'erythroleukemia,' which is considered by most to be a subtype of acute myelogenous leukemia (AML; 601626). Controversy about the precise definition of erythroleukemia revolves around the number or percentage of erythroblasts and myeloblasts found in the bone marrow and peripheral circulation. In the French-American-British (FAB) classification system (Bennett et al., 1985), it is known as AML-M6, whereas in the revised World Health Organization (WHO) classification system (Harris et al., 1999), it is known as 'AML, not otherwise categorized' (Zini and D'Onofrio, 2004). [from OMIM]
Microcytic anemia with liver iron overload
Hypochromic microcytic anemia with iron overload is a condition that impairs the normal transport of iron in cells. Iron is an essential component of hemoglobin, which is the substance that red blood cells use to carry oxygen to cells and tissues throughout the body. In this condition, red blood cells cannot access iron in the blood, so there is a decrease of red blood cell production (anemia) that is apparent at birth. The red blood cells that are produced are abnormally small (microcytic) and pale (hypochromic). Hypochromic microcytic anemia with iron overload can lead to pale skin (pallor), tiredness (fatigue), and slow growth.In hypochromic microcytic anemia with iron overload, the iron that is not used by red blood cells accumulates in the liver, which can impair its function over time. The liver problems typically become apparent in adolescence or early adulthood. [from MedlinePlus Genetics]
Hydrops-lactic acidosis-sideroblastic anemia-multisystemic failure syndrome
Hydrops, lactic acidosis, and sideroblastic anemia (HLASA) is an autosomal recessive multisystem disorder characterized by the onset of hydrops in utero. The severity of the hydrops and the disorder in general is highly variable. At birth, affected infants usually show poor growth, lactic acidosis, pulmonary hypertension with hypoxic respiratory insufficiency, and sideroblastic anemia. More variable features may include hepatosplenomegaly or cholestasis, hypoglycemia, pancreatic insufficiency, and micropenis or hypospadias. Death in infancy may occur. Those who survive tend to have resolution of lactic acidosis and anemia, but may show developmental delay and sensorineural deafness (summary by Riley et al., 2020). [from OMIM]
Hemolytic anemia due to erythrocyte adenosine deaminase overproduction
Congenital nonspherocytic hemolytic anemia-9 (CNSHA9) is an X-linked hematologic disorder characterized by onset of mild to moderate red cell anemia soon after birth or in childhood. The anemia is associated with significantly increased activity of ADA (608958) specifically in erythrocyte precursors. ATP levels may be secondarily decreased. Additional features may include low birth weight, thrombocytopenia, hypospadias, and splenomegaly. Males are preferentially affected, although carrier females may show elevated erythrocyte ADA or mild features (Ludwig et al., 2022). [from OMIM]
Erythroid hyperplasia
Increased count of erythroid precursor cells, that is, erythroid lineage cells in the bone marrow. [from HPO]
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