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Frontiers of Medicine

ISSN 2095-0217

ISSN 2095-0225(Online)

CN 11-5983/R

邮发代号 80-967

2019 Impact Factor: 3.421

Frontiers of Medicine  2020, Vol. 14 Issue (1): 101-111   https://doi.org/10.1007/s11684-019-0698-4
  本期目录
Detecting genetic hypermutability of gastrointestinal tumor by using a forensic STR kit
Anqi Chen1,2, Suhua Zhang2, Jixi Li1, Chaoneng Ji1, Jinzhong Chen1(), Chengtao Li2()
1. State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai 200433, China
2. Shanghai Key Laboratory of Forensic Medicine, Shanghai Forensic Service Platform, Institute of Forensic Sciences, Ministry of Justice, Shanghai 200063, China
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Abstract

Growing evidence suggests that somatic hypermutational status and programmed cell death-1 overexpression are potential predictive biomarkers indicating treatment benefits from immunotherapy using immune checkpoint inhibitors. However, biomarker-matched trials are still limited, and many of the genomic alterations remain difficult to target. To isolate the potential somatic hypermutational tumor from microsatellite instability low/microsatellite stability (MSI-L/MSS) cases, we employed two commercial kits to determine MSI and forensic short tandem repeat (STR) alternations in 250 gastrointestinal (GI) tumors. Three types of forensic STR alternations, namely, allelic loss, Aadd, and Anew, were identified. 62.4% (156/250) of the patients with GI exhibited STR alternation, including 100% (15/15) and 60% (141/235) of the microsatellite high instability and MSI-L/MSS cases, respectively. 30% (75/250) of the patients exhibited STR instability with more than 26.32% (26.32%–84.21%) STR alternation. The cutoff with 26.32% of the STR alternations covered all 15 MSI cases and suggested that it might be a potential threshold. Given the similar mechanism of the mutations of MSI and forensic STR, the widely used forensic identifier STR kit might provide potential usage for identifying hypermutational status in GI cancers.

Key wordsmismatch repair protein deficiency (MMR-D)    microsatellite instability (MSI)    short tandem repeats (STR)    gastrointestinal tumor    hypermutability
收稿日期: 2018-10-17      出版日期: 2020-03-02
Corresponding Author(s): Jinzhong Chen,Chengtao Li   
 引用本文:   
. [J]. Frontiers of Medicine, 2020, 14(1): 101-111.
Anqi Chen, Suhua Zhang, Jixi Li, Chaoneng Ji, Jinzhong Chen, Chengtao Li. Detecting genetic hypermutability of gastrointestinal tumor by using a forensic STR kit. Front. Med., 2020, 14(1): 101-111.
 链接本文:  
https://academic.hep.com.cn/fmd/CN/10.1007/s11684-019-0698-4
https://academic.hep.com.cn/fmd/CN/Y2020/V14/I1/101
Fig.1  
Fig.2  
Fig.3  
MSI status Caner type Total
GC (n = 121) CRC (n = 129)
MSS 109 122 231
MSI-L 3 1 4
MSI-H 9 6 15 (6%)
Total MSI 12 7 19
Tab.1  
Sample No. MSI STR
Mutation No. Status Mutation No. Alteration rate
021 6 MSI-H 15 78.95%
038 2 MSI-H 5 26.32%
043 1 MSI-L 9 47.37%
048 6 MSI-H 7 36.84%
056 6 MSI-H 16 84.21%
106 6 MSI-H 14 73.68%
108 5 MSI-H 10 55.56%
130 6 MSI-H 13 68.42%
135 6 MSI-H 10 52.63%
165 6 MSI-H 13 68.42%
168 1 MSI-L 10 52.63%
173 6 MSI-H 7 36.84%
178 1 MSI-L 14 73.68%
191 1 MSI-L 6 31.58%
207 5 MSI-H 10 52.63%
213 6 MSI-H 15 78.95%
223 4 MSI-H 8 42.11%
227 5 MSI-H 6 31.58%
236 6 MSI-H 13 68.42%
Tab.2  
STR alternation type Alternation ratea P valuec
CRC GC
L 74.94% (308/411) 69.50% (237/341) 0.0968
Aadd 18.25% (75/411) 28.45% (97/341) 0.0009
Anew 6.81% (28/411) 2.05% (7/341) 0.002
STR alternation type Alternation rateb P valuec
MSI-H MSI-L/MSS
L 11.11% (18/162) 89.32% (527/590) < 0.0001
Aadd 82.72% (134/162) 6.44% (38/590) < 0.0001
Anew 6.17% (10/162) 4.24% (25/590) 0.3009
Tab.3  
MSI loci Alternation rate P value
CRC (n = 129) GC (n = 121)
NR-21 3.88% (5/129) 6.61% (8/121) 0.3322
BAT-26 4.65% (6/129) 6.61% (8/121) 0.5024
NR-27 4.65% (6/129) 6.61% (8/121) 0.5024
BAT-25 5.43% (7/129) 9.09% (11/121) 0.2644
NR-24 3.88% (5/129) 5.79% (7/121) 0.4824
MONO-27 3.10% (4/129) 7.44% (9/121) 0.1237
Tab.4  
Locus STR altered (%)
Totala L Aadd Anew
vWA 21.14% (52/246) 10.57% (26/246) 3.66% (9/246) 6.91% (17/246)
Penta E 22.45% (55/245) 17.14% (42/245) 4.08% (10/245) 1.22% (3/245)
D18S51 32.79% (81/247) 26.32% (65/247) 5.67% (14/247) 0.81% (2/247)
FGA 21.46% (53/247) 15.79% (39/247) 4.86% (12/247) 0.81% (2/247)
Penta D 16.8% (42/250) 13.2% (33/250) 2.8% (7/250) 0.8% (2/250)
D13S317 11.29% (28/248) 8.87% (22/248) 2.02% (5/248) 0.4% (1/248)
D6S1043 15.26% (38/249) 10.84% (27/249) 4.02% (10/249) 0.4% (1/249)
CSF1PO 22.09% (55/249) 18.47% (46/249) 3.61% (9/249) 0% (0/249)
D5S818 18.47% (46/249) 14.06% (35/249) 4.42% (11/249) 0% (0/249)
D8S1179 15.32% (38/248) 11.29% (28/248) 4.03% (10/248) 0% (0/248)
D12S391 14.17% (35/247) 11.34% (28/247) 2.83% (7/247) 0% (0/247)
D2S1338 14.06% (35/249) 10.84% (27/249) 3.21% (8/249) 0% (0/249)
D19S433 13.01% (32/246) 7.32% (18/246) 5.69% (14/246) 0% (0/246)
D21S11 12.45% (31/249) 7.63% (19/249) 4.82% (12/249) 0% (0/249)
D16S539 12% (30/250) 9.6% (24/250) 2.4% (6/250) 0% (0/250)
D7S820 11.65% (29/249) 7.23% (18/249) 4.42% (11/249) 0% (0/249)
D3S1358 10.8% (27/250) 6.8% (17/250) 4% (10/250) 0% (0/250)
TH01 8.87% (22/248) 7.66% (19/248) 1.21% (3/248) 0% (0/248)
TPOX 6.43% (16/249) 4.82% (12/249) 1.61% (4/249) 0% (0/249)
Tab.5  
Locus Chromosomal location Repeat Germline mutation frequency [25,26] Mutation frequency
D19S433 19q12 (AAGG)(AAAG)(AAGG)(TAGG)[AAGG]n 0.11% 13.01% (32/246)
D7S820 7q21.11 [GATA] 0.10% 11.65% (29/249)
D6S1043 6q15 [AGAT]9–25 0.14% 15.26% (38/249)
CSF1PO 5q33.1 [AGAT] 0.16% 22.09% (55/249)
D5S818 5q23.2 [AGAT] 0.11% 18.47% (46/249)
FGA 4q28 [TTTC]3TTTTTTCT[CTTT]nCTCC[TTCC]2 0.28% 21.46% (53/247)
D3S1358 3p21.31 [AGAT], [TCTA] 0.12% 10.80% (27/250)
D2S1338 2q35 [TGCC]n[TTCC]n 0.12% 14.06% (35/249)
TPOX 2p25.3 [AATG] 0.01% 6.43% (16/249)
D21S11 21q21.1 [TCTA], [TCTG] 0.19% 12.45% (31/249)
Penta D 21q22.3 [AAAGA] 0.14% 16.80% (42/250)
D18S51 18q21.33 [GAAA] 0.22% 32.79% (81/247)
D16S539 16q24.1 [GATA] 0.11% 12.00% (30/250)
Penta E 15q26.2 [AAAGA] 0.16% 22.45% (55/245)
D13S317 13q31.1 [TATC] 0.14% 11.29% (28/248)
D12S391 12p13.2 [AGAT]8–17[AGAC]6–10[AGAT]0–1 0.24% 14.17% (35/247)
Vwa 12p13.31 [TCTA] with [TCTG] and [TCCA] inserts 0.17% 21.14% (52/246)
TH01 11p15.5 [TCAT] 0.01% 8.87% (22/248)
D8S1179 8q24.13 [TATC] 0.14% 15.32% (38/248)
Tab.6  
Fig.4  
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