ZRSR2 gene related symptoms and diseases

Alternate names

JUVENILE MYELOMONOCYTIC LEUKEMIA Is also known as juvenile chronic myelomonocytic leukemia, jmml, leukemia, juvenile myelomonocytic

Description

Juvenile myelomonocytic leukemia is an aggressive pediatric myelodysplastic syndrome (MDS)/myeloproliferative disorder (MPD) characterized by malignant transformation in the hematopoietic stem cell compartment with proliferation of differentiated progeny (Loh et al., 2009). JMML constitutes approximately 30% of childhood cases of myelodysplastic syndrome and 2% of leukemia (Hasle et al., 1999). Although JMML is a progressive and often rapidly fatal disease without hematopoietic stem cell transplantation (HSCT), some patients have been shown to have a prolonged and stable clinical course without HSCT (Niemeyer et al., 1997). Chronic myelomonocytic leukemia (CMML) is a similar disorder with later onset. Both JMML and CMML have a high frequency of mutations affecting the RAS signaling pathway and show hypersensitivity to stimulation with GM-CSF, which causes STAT5 (OMIM ) hyperphosphorylation (Loh et al., 2009). Genetic Heterogeneity of Juvenile Myelomonocytic LeukemiaIn up to 60% of cases of JMML, the RAS/MAPK pathway is deregulated due to somatic mutations in the PTPN11 (OMIM ), KRAS (OMIM ), and NRAS (OMIM ) genes. Additionally, both germline and somatic mutations in the CBL gene have been found in patients with JMML, indicating a frequency of 10 to 15% of JMML patients overall (Loh et al., 2009). Somatic disruptions of the GRAF gene (ARHGAP26 ) have also been found in patients with JMML.About 10 to 15% of JMML cases arise in children with neurofibromatosis type I (NF1 ) due to germline mutations in the NF1 gene (OMIM ). In addition, patients with Noonan syndrome (NS1, {163950}; NS3, {609942}) or Noonan syndrome-like disorder (NSLL ) due to germline mutations in the PTPN11, KRAS2, and CBL genes, respectively, also have an increased risk of developing JMML. Genetic Heterogeneity of Chronic Myelomonocytic LeukemiaSomatic mutations in the CBL, ASXL1 (OMIM ), TET2 (OMIM ), and SF3B1 (OMIM ) genes have been found in patients with CMML.

Most common symptoms of JUVENILE MYELOMONOCYTIC LEUKEMIA

• Generalized hypotonia
• Abnormal facial shape
• Anemia
• Anteverted nares
• Splenomegaly

SOURCES: ORPHANET MESH OMIM