Microsatellite Instability and MMR Genes Abnormalities in Canine Mammary Gland Tumors

Overview

Journal Diagnostics (Basel)

Specialty Radiology

Date 2020 Feb 21

PMID 32075116

Citations 5

Authors

Faiz Muhammad Khand

Da-Wei Yao

Pan Hao

Xin-Qi Wu

Asghar Ali Kamboh

De-Ji Yang

Affiliations

Soon will be listed here.

Abstract

Early diagnosis of mammary gland tumors is a challenging task in animals, especially in unspayed dogs. Hence, this study investigated the role of microsatellite instability (MSI), MMR gene mRNA transcript levels and SNPs of MMR genes in canine mammary gland tumors (CMT). A total of 77 microsatellite (MS) markers in 23 primary CMT were selected from four breeds of dogs. The results revealed that 11 out of 77 MS markers were unstable and showed MSI in all the tumors (at least at one locus), while the other markers were stable. Compared to the other markers, the ABC9TETRA, MEPIA, 9A5, SCNA11 and FJL25 markers showed higher frequencies of instability. All CMT demonstrated MSI, with eight tumors presenting MSI-H. The RT-qPCR results revealed significant upregulation of the mRNA levels of , , and , but downregulation of compared to the levels in the control group. Moreover, single nucleotide polymorphisms (SNPs) were observed in the gene in four exons, i.e., 2, 6, 15, and 16. In conclusion, MSI, overexpression of MMR genes and SNPs in the MMR gene are associated with CMT and could be served as diagnostic biomarkers for CMT in the future.

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