Reference Detail

Ref Type

Journal Article

PMID

(18795925)

Authors

Foster R, Byrnes E, Meldrum C, Griffith R, Ross G, Upjohn E, Braue A, Scott R, Varigos G, Ferrao P, Ashman LK

Title

Association of paediatric mastocytosis with a polymorphism resulting in an amino acid substitution (M541L) in the transmembrane domain of c-KIT.

Journal	Vol	Issue	Date	Pages	Journal Short Title
The British journal of dermatology	159	5	2008 Nov	1160-9	Br J Dermatol

URL

Abstract Text

The receptor tyrosine kinase c-KIT plays a key role in normal mast cell development. Point mutations in c-KIT have been associated with sporadic or familial mastocytosis.Two unrelated pairs of apparently identical twins affected by cutaneous mastocytosis attending the Mastocytosis Clinic at the Royal Children's Hospital, Melbourne, provided an opportunity to assess the possible contribution of c-KIT germline mutations or polymorphisms in this disease.Tissue biopsy, blood and/or buccal swab specimens were collected from 10 children with mastocytosis. To detect germline mutations/polymorphisms in c-KIT, we studied all coding exons by denaturing high pressure liquid chromatography. Exons showing mismatches were examined by direct sequencing. The influence of the substitution identified was further examined by expressing the variant form of c-KIT in factor-dependent FDC-P1 cells.In both pairs of twins, a heterozygous ATG to CTG transition in codon 541 was observed, resulting in the substitution of a methionine residue in the transmembrane domain by leucine (M541L). In each case, one parent was also heterozygous for this allele. Expression of M541L KIT in FDC-P1 cells enabled them to grow in human KIT ligand (stem cell factor, SCF) but did not confer factor independence. Compared with cells expressing wild-type KIT at a similar level, M541L KIT-expressing cells displayed enhanced growth at low levels of SCF, and heightened sensitivity to the KIT inhibitor, imatinib mesylate.The data suggest that the single nucleotide polymorphism resulting in the substitution M541L may predispose to paediatric mastocytosis.

Filtering

Case insensitive filtering will display rows if any text in any cell matches the filter term
Use simple literal full or partial string matches
Separate multiple filter terms with a space. Any order may be used (i. e. a b c and c b a are equivalent )
Filtering will only apply to rows that are already loaded on the page. Filtering has no impact on query parameters.
Use quotes to match on a longer phrase with spaces (i.e. "mtor c1483f")

Sorting

Generally, the default sort order for tables is set to be first column ascending; however, specific tables may set a different default sort order.
Click on any column header arrows to sort by that column
Hold down the Shift key and click multiple columns to sort by more than one column. Be sure to set ascending or descending order for a given column before moving on to the next column.

Molecular Profile	Treatment Approach

Gene Name	Source	Synonyms	Protein Domains	Gene Description	Gene Role

Therapy Name	Drugs	Efficacy Evidence	Clinical Trials

Drug Name	Trade Name	Synonyms	Drug Classes	Drug Description

Gene	Variant	Impact	Protein Effect	Variant Description	Associated with drug Resistance
KIT	M537L	missense	unknown	KIT M537L (corresponds to M541L in the canonical isoform) lies within the transmembrane domain of the Kit protein (PMID: 16226710). M537L (M541L) is a common polymorphism that has been demonstrated to increase proliferation in the presence of ligand compared to wild-type Kit in culture (PMID: 18795925), but is not associated with tumorigenesis in the population (PMID: 16307017, PMID: 21757432), and therefore, its effect on Kit protein function is unknown.
KIT	M541L	missense	unknown	KIT M541L lies within the transmembrane domain of the Kit protein (PMID: 16226710). M541L is a common polymorphism that has been demonstrated to increase proliferation in the presence of ligand compared to wild-type Kit in culture (PMID: 18795925), but is not associated with tumorigenesis in the population (PMID: 16307017, PMID: 21757432), and therefore, its effect on Kit protein function is unknown.

Molecular Profile	Indication/Tumor Type	Response Type	Therapy Name	Approval Status	Evidence Type	Efficacy Evidence	References
KIT M541L	chronic leukemia	sensitive	Imatinib	Phase I	Actionable	In Phase I trials, KIT M541L has been associated with response to Gleevec (imatinib) in chronic eosinophilic leukemia, NOS (PMID: 25015329) and mastocytosis (PMID: 18795925).	25015329 18795925