Methodology Research on Loss of Heterozygosity of APC Gene Detection Exon 11 of Gastric Cancer by Capillary Electrophoresis

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1 FENXI CESHI XUEBAO Journal of Instrumental Analysis Vol. 30 No ~ 502 APC PCR APC 96 RsaⅠ CE - SS- CP CE - RFLP PAGE - SSCP PAGE 15% CE 3. 0% PEO 1 TBE ph kv 15 λ ex = 488 nm λ em = 520 nm CE - SSCP 30% > PAGE - SSCP 25% > CE - RFLP 20% APC 10% CE - SSCP PAGE - SSCP CE - RFLP CE - SSCP O Q754 doi /j. issn A Methodology Research on Loss of Heterozygosity of APC Gene Detection Exon 11 of Gastric Cancer by Capillary Electrophoresis XIE Xi-hui 1 2 WANG Rong 1 2 XIE Hua 2 JIA Zheng-ping 1 2 ZHANG Ai-mei 3 MENG Xian-dong 2 MA Jun 2 1. Pharmacy College Lanzhou University Lanzhou China 2. State Base for Drug Clinical Trails Lanzhou General Hospital of PLA Lanzhou China 3. Life Science College Northwest Normal University Lanzhou China Abstract In this paper the part base sequences of APC gene on exon 11 were extracted from normal tissue and gastric cancer tissue and amplified by polymerase chain reaction PCR which contains some bases easily resulting in loss of heterozygosis LOH. Then the amplified samples were denatured at 96 and digested by restriction enzyme of RsaⅠand detected by capillary electrophoresis CE - single strand conformation polymorphism SSCP capillary electrophoresis - restriction fragment length polymorphism RFLP and polyacrylamide gel electrophoresis PAGE - SSCP. The concentration of polyacrylamide gel was selected to be 15%. The analysis of APC gene on exon 11 was performed by CE combined with laser-induced fluorescence detector λ ex = 488 nm λ em = 520 nm by using 3. 0% polyethylene oxide PEO as sieving medium 1 TBE ph 8. 2 as electrophoresis buffer with a separation voltage of 15 kv at 15. The sequence of detection ratios for APC gene detected by different methods was as follows CE - SSCP 30% > PAGE - SSCP 25% > CE - RFLP 20%. The results revealed that the LOH of APC gene in gastric cancer tissue was higher than 10% and the detection ratio for CE - SSCP was higher than that for PAGE - SSCP and CE - RFLP. Therefore with the advantages of rapidness and high sensitivity the CE - SSCP method could lay a good foundation for the convenient reliable and early diagnosis on gastric cancer ZS031 - A E Tel E - mail wangrong - 69@ 163. com Tel E - mail zhengpingjia@ 163. com

2 5 APC 499 Key words gastric cancer loss of heterozygosity capillary electrophoresis polyacrylamide gel e- lectrophoresis single strand conformation polymorphism restriction fragment length polymorphism Adenomatous polyposis coli APC 5q21 15 APC 1 - APC 7 APC APC 8 5' 9-10 APC SSCP RFLP TGGE DGGE DNA DNA SSCP RFLP CE 11 DNA Mitchelson 12 CE Zhang 13 K- ras CE PCR SSCP RFLP PAGE CE APC P /ACE System 5000 P /ACE System 5000 station P /ACE System laser module 488 nm Beckman PCR PEO M r = RsaⅠ Ferment TEMED APS γ- - MAPS A Johnson Matthey Company Tris EDTA TaqDNA PCR SYBR GreenⅠ μl / puc19 DNA / MspⅠ HpaⅡ DNA Marker DNA PCR DNA K - DNA PP5. 0 APC 5'-GCACTACAGGCCATTGCAGAA-3' 5'-GGCTACATCTCCAAAAGTCAA-3' 133 bp PCR 25 μl dntp 200 μmol /L TaqDNA 0. 5 U /μl μmol /L DNA 20 mg /L PCR s s s PCR RsaⅠ PCR 30 μl RsaⅠ10 U 9 μl 18 μl 2 μl 37 4 h min PAGE - SSCP 1 / min 5 min 3 μl 15% 125 V 8 h 1 Tris - TBE AgNO CE - SSCP CE - RFLP 16 λ ex = 488 nm λ em =

3 nm P /ACE System station 22 μl 5 μl TBE 3 μl SYBR GreenⅠ PEO puc19 DNA /Msp Ⅰ HpaⅡ DNA Marker APC puc19 DNA /Msp Ⅰ Hpa Ⅱ DNA Marker CE puc19 DNA /Msp Ⅰ Hpa Ⅱ DNA Marker % PEO ph kv 15 1 puc19 DNA /Msp Ⅰ Hpa Ⅱ 1 puc19 DNA /MspⅠ Hpa Ⅱ DNA Marker 12 DNA 11 DNA Marker 26 bp 34 bp DNA Fig. 1 Electropherogram of puc19 DNA / MspⅠ Hpa Ⅱ DNA Marker separation by CE bp 111 bp DNA DNA bp 2. 2 PCR 15% PCR AgNO bp Maker puc19 DNA /MspⅠ Hpa Ⅱ DNA Marker 2. 3 PAGE - SSCP PCR PAGE DNA ss 1 ss 1 DNA ds ds ss PAGE - SS- CP % APC 2. 4 CE - RFLP APC RsaⅠ bp bp bp 1 CE 10 min 4 3 PAGE - SSCP DNA bp 3 Fig. 3 Electropherograms of degenerated DNA samples by PAGE - SSCP bp 2 APC M. puc19 DNA /MspⅠ Hpa Ⅱ DNA Marker 1-4. normal 40 8 tissue - denaturation 5-8. gastric cancer tissue - denaturation ss. single strand ds. double strand 20% CE RFLP

4 5 APC 501 PAGE 2. 5 CE - SSCP 5 5A 10 min 1 ds 10 ~ 11 min 2 ss 5B ds ss ss % CE - SSCP PAGE - SSCP 2 PAGE PCR CE - SSCP PAGE - SS- Fig. 2 Electropherogram of PCR amplification by PAGE CP 5% CE - RFLP M. puc19 DNA /MspⅠ Hpa Ⅱ DNA Marker 1. normal tissue 10% CE - SSCP 2. gastric cancer tissue 4 CE - RFLP DNA A B Fig. 4 Electropherograms of enzymes cut DNA samples of normal tissue A and gastric cancer tissue B by CE - RFLP 5 CE - SSCP DNA A B Fig. 5 Electropherogram of degenerated DNA samples of normal tissue A and gastric cancer tissue B by CE - SSCP 1. double strand 2-3. denaturated single strand of normal tissue ss 4. denaturated mutant type single strand of gastric cancer tissue ss

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