C-KIT Mutation
Description:
Activating mutations in C-KIT can be detected in the bone marrow and peripheral blood, in patients with systemic mastocytosis. These mutations most commonly involve codon 816 of the intracellular tyrosine kinase domain (D816V, D816Y, D816F or D816H) and cause ligand-independent autophosphorylation of the receptor. An additional mutation in codon 560 within the juxtamembrane domain of KIT, yielding a V560G substitution has also been detected in the human mast cell leukemia line HMC-1 and in some patient with mastocytosis. It has been found that almost all sporadic adult mastocytosis patients carry codon 816 somatic mutation regardless of the classification or the prognosis of their disease. However these mutations have been found only rarely in children with progressive mastocytosis and not in familial mastocytosis. C-KIT D816V mutations are detected using DNA allele competitive blocker and real time PCR assays with a sensitivity of 0.1%.
Clinical details:
Factors affecting results or interpretation: This analysis is referred to the Leukaemia Research Group, Wessex Regional Genetics Laboratory, Salisbury District General Hospital. Please note that mastocytosis is often focal in the marrow and absent from the peripheral blood. The analysis of peripheral blood is not ideal since it is more likely to give rise to false negative results.
Department:
Location:
Last updated: 19/01/2017
