C-KIT Mutation

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.
Sample type and Volume required: 
Bone marrow is the preferred sample for C-KIT analysis. In the absence of BM peripheral blood can be analysed but is prone to false negative results. Presence of heparin anticoagulant will inhibit PCR applications. Clotted samples are unsuitable for DNA analysis. Samples must be clearly labelled with the patient's first name, surname, D.O.B, hospital number and the date the sample was taken.
Turnaround time: 
1 month
Storage and transport: 
To be sent within 2 days and stored at room temperature. First class postage is adequate but samples must be shipped with packaging appropriate for UN 3373 samples following packing instruction 650. See link for further details: http://www.dft.gov.uk Samples should be addressed to: Central Specimen Reception, Ground Floor, Bessemer Wing, King's College Hospital, Denmark Hill, London SE5 9RS, United Kingdom. See laboratory page for printable request form.
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Time limit for extra tests: 
Test specific - please enquire.
HMDC Laboratory for Molecular Haemato-Oncology at King's College Hospital
020 7848 5809
King's College Hospital
Denmark Hill
London SE5 9RS
HMDC Department at King's College Hospital
020 3299 9000 ext 32414
c/o Central Specimen Reception
Blood Sciences Laboratory
Ground Floor Bessemer Wing
King’s College Hospital
Denmark Hill
London SE5 9RS
Mon-Fri, 9.00am-5.30pm
For clinical advice or interpretation of results, please contact the laboratory in the first instance.

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Last updated: 19/01/2017