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MSI/LOH and extron expression of the FHIT gene in gastric carcinoma

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Abstract

We detected loss of heterozygosity (LOH) and microsatellite instabilities (MSI), as well as extron expression of the fragile histidine triad (FHIT) gene in gastric carcinoma (GC), in order to evaluate their association with clinicopathological processes in gastric carcinogenesis. LOH and MSI of the FHIT were detected by using PCR at 4 microsatellite loci: D3S 1300, D3S 4103, D3S 1481, D3S 1234 in cancer tissues from 50 patients with primary GC, with normal mucosa acting as matched controls. FHIT transcripts were detected by nested RT-PCR in 30 cases of GC and their products were sequenced. Results show that the average frequencies of LOH and MSI of the FHIT gene in GC were 32.4% and 26.4%, respectively. There was no correlation between LOH and MSI of the FHIT gene in GC and the histological characteristics of gastric carcinoma (Bormann’s or Lauren’s classification). LOH of the FHIT gene in GC was related to depth invasiveness, and its frequency in GC where serosa was penetrated was significantly higher than that in GC without serosa penetration (73.5% vs 37.5%, P < 0.05). The frequency of MSI in GC without lymph node metastasis was significantly higher than that in GC with lymph node metastasis (66.7% vs 34.3%, P < 0.05). Aberrant transcripts were found in 11/30 GC tissues. Sequencing analysis of the aberrant fragments found a RT-PCR product missing exons 5–7 in one case of GC, and another product missing exons 4–7. Four of 10 (40.0%) cases of primary GC showed absent or decreased expression of the FHIT protein as compared to their matched normal tissues. The findings in this study suggest that LOH and MSI of FHIT gene may induce aberrant extron expression, which might play a role in gastric carcinogenesis.

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Authors and Affiliations

  1. Cancer Institute, the First Affiliated Hospital, China Medical University, Shenyang, 110001, China

    Xiao Yuping MD, Mao Lili BM, Han Chengbo MD, Li Jinyi MD, Xu Lei MD & Xin Yan MD

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  1. Xiao Yuping MD
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  2. Mao Lili BM
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  3. Han Chengbo MD
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  4. Li Jinyi MD
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  5. Xu Lei MD
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  6. Xin Yan MD
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Correspondence to Xin Yan MD.

Additional information

Translated from Journal of China Medical University, 2006, 35(2): 122–123, 127 [译自: 中国医科大学学报]

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Xiao, Y., Mao, L., Han, C. et al. MSI/LOH and extron expression of the FHIT gene in gastric carcinoma. Front. Med. China 1, 99–103 (2007). https://doi.org/10.1007/s11684-007-0019-1

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