Microsatellite Instability in Chronic Myeloid Leukemia using D17S261 and D3S643 markers: A Pilot Study in Gujarat Population

STR profiling in a cohort of Saudi patients with acute leukemia

Objective

This study was aimed at characterizing whether the autosomal short tandem repeats (STRs) used in forensic identification might differ between leukemic blood samples and saliva samples.

Methods

Blood and saliva samples were collected from 27 patients diagnosed with acute leukemia in Riyadh City, KSA. DNA was extracted, and 15 STR loci were amplified.

Results

Approximately 59.3% of patients with leukemia exhibited mutations at the STR loci. Loss of heterozygosity (LOH) occurred in 40.7% of the patients at D19S433, D16S539, vWA, D13S317, TH01, FGA, and D2S1338. Microsatellite instability (MSI) was detected in 22.2% of patients at TPOX, vWA, D19S433, D16S539, and D18S51. D19S433 and D16S539 were the most affected loci, exhibiting an alteration percentage of 18.52%, followed by vWA (11.11%); in contrast, D2S1338, D18S51, and TPOX were the least affected loci, showing a mutation percentage of 3.7%. D13S317, TH01, and FGA showed moderate genetic mutation (7.41%). CSF1PO, D21S11, D3S1358, D5S818, D7S820, D8S1179, and amelogenin did not show genetic changes in all samples. The overall genetic variability between saliva and blood samples significantly differed (P < 0.001).

Conclusion

Our results demonstrate the potential application of forensically used STR loci in diagnosis and monitoring of patients with leukemia. Further study applying next generation sequencing technology is necessary to validate these findings and explore the clinical applications of forensically used STRs as diagnostic tools for leukemia.

Microsatellite instability: a review of what the oncologist should know

The patients with high microsatellite instability (MSI-H)/mismatch repair deficient (dMMR) tumors recently have been reported that can benefit from immunotherapy, and MSI can be used as a genetic instability of a tumor detection index. However, many studies have shown that there are many heterogeneous phenomena in patients with MSI tumors in terms of immunotherapy, prognosis and chemotherapy sensitivity. Here we mainly review the research results of MSI detection methods, the mechanisms of MSI occurrence and its relationship with related tumors, aiming to make a brief analysis of the current research status of MSI and provide comparable reference and guidance value for further research in this field.