Microsatellite Instability Use in Mismatch Repair Gene Sequence Variant Classification

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Author
Thompson, BA; Spurdle, ABDate
2015-06-01Source Title
GenesPublisher
MDPIUniversity of Melbourne Author/s
Thompson, BryonyAffiliation
Clinical PathologyMetadata
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Journal ArticleCitations
Thompson, B. A. & Spurdle, A. B. (2015). Microsatellite Instability Use in Mismatch Repair Gene Sequence Variant Classification. GENES, 6 (2), pp.150-162. https://doi.org/10.3390/genes6020150.Access Status
Open AccessAbstract
Inherited mutations in the DNA mismatch repair genes (MMR) can cause MMR deficiency and increased susceptibility to colorectal and endometrial cancer. Microsatellite instability (MSI) is the defining molecular signature of MMR deficiency. The clinical classification of identified MMR gene sequence variants has a direct impact on the management of patients and their families. For a significant proportion of cases sequence variants of uncertain clinical significance (also known as unclassified variants) are identified, constituting a challenge for genetic counselling and clinical management of families. The effect on protein function of these variants is difficult to interpret. The presence or absence of MSI in tumours can aid in determining the pathogenicity of associated unclassified MMR gene variants. However, there are some considerations that need to be taken into account when using MSI for variant interpretation. The use of MSI and other tumour characteristics in MMR gene sequence variant classification will be explored in this review.
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