Reference Detail

Ref Type

Journal Article

PMID

(16143141)

Authors

Hartmann K, Wardelmann E, Ma Y, Merkelbach-Bruse S, Preussner LM, Woolery C, Baldus SE, Heinicke T, Thiele J, Buettner R, Longley BJ

Title

Novel germline mutation of KIT associated with familial gastrointestinal stromal tumors and mastocytosis.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Gastroenterology	129	3	2005 Sep	1042-6	Gastroenterology

URL

Abstract Text

Gastrointestinal stromal tumors (GISTs) are often associated with activating KIT mutations, affecting regulatory domains of the KIT tyrosine kinase. Sporadic mastocytosis in adults is usually also caused by KIT mutations that, however, activate KIT by affecting the intracellular enzymatic site of the molecule. Most GISTs respond to KIT inhibitors that bind to the enzymatic site; in most cases of mastocytosis, however, the modified enzymatic site is not affected by these drugs. We present a kindred with both familial GISTs and mastocytosis that express a novel germline KIT mutation in exon 8, resulting in deletion of codon 419 and affecting the extracellular domain of KIT. This mutation activates KIT, and the mutant KIT is inhibited by the tyrosine kinase inhibitor imatinib mesylate. Our studies identify a new regulatory region in the KIT molecule and strongly suggest that patients with extracellular KIT mutations respond to tyrosine kinase inhibitors.

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	D419del	deletion	unknown	KIT D419del results in the deletion of an amino acid in Ig-like C2-type domain 5 of the Kit protein at amino acid 419 (UniProt.org). The functional effect of D419del is conflicting, as D419del has been reported to result in ligand-independent phosphorylation of Kit (PMID: 16143141, PMID: 15618474), and to result in lack of Kit phosphorylation and lack of cytokine-independent growth in cell culture (PMID: 31182436), and leads to Kit inactivation in response to Ptpre similar to wild-type Kit in cultured cells (PMID: 33732906).

Molecular Profile	Indication/Tumor Type	Response Type	Therapy Name	Approval Status	Evidence Type	Efficacy Evidence	References
KIT D419del	Advanced Solid Tumor	predicted - sensitive	Imatinib	Preclinical - Biochemical	Actionable	In a preclinical study, Gleevec (imatinib) treatment inhibited Kit autophosphorylation in transformed cells expressing KIT D419del in culture (PMID: 16143141).	16143141