AIM: To search candidate tumor suppressor genes (TSGs) on chromosome 4q through detecting high loss of heterozygosity (LOH) regions in sporadic colorectal carcinoma in Chinese patients. METHODS: Thirteen fluorescent l...AIM: To search candidate tumor suppressor genes (TSGs) on chromosome 4q through detecting high loss of heterozygosity (LOH) regions in sporadic colorectal carcinoma in Chinese patients. METHODS: Thirteen fluorescent labeled polymorphic microsatellite markers were analyzed in 83 cases of colorectal carcinoma and matched normal tissue DNA by polymerase chain reaction (PCR). PCR products were eletrophoresed on an ABI 377 DNA sequencer. Genescan 3.7 and Genotype 3.7 software were used for LOH scanning and analysis. Comparison between LOH frequency and clinicopathological factors were performed by χ2 test. RESULTS: Data were collected on all informative loci. The average LOH frequency on 4q was 28.56%. The D4S2915 locus showed highest LOH frequency (36.17%). Two obvious deletion regions were detected: one between D4S3000 and D4S2915 locus (4q12-21.1), another flanked by D4S407 and D4S2939 locus (4q25-31.1). None case showed complete deletion of 4q, most cases displayed interstitial deletion pattern solely. Furthermore, compared with clinicopathological features, a significant relationship was observed between LOH frequencies on D4S3018locus. In tumors larger than 5 cm in diameter, LOH frequency was significantly higher than tumors that were less than 5 cm (56% vs 13.79%, P = 0.01). On D4S1534 locus, LOH was significantly associated with liver metastasis (80% vs 17.25%, P = 0.012). No relationship was detected on other locus compared with clinicopathologial features. CONCLUSION: By high resolution deletion mapping, two high frequency regions of LOH (4q12-21.1 and 4q25-31.1) were detected, which may contribute to locate TSGs on chromosome 4q involved in carcinogenesis and progression of sporadic colorectal carcinoma.展开更多
Primary intestinal lymphangiectasia(PIL)is a rare disorder characterized by dilated intestinal lymphatics and the development of protein-losing enteropathy.Patients with PIL develop hypoalbuminemia,hypocalcemia,lympho...Primary intestinal lymphangiectasia(PIL)is a rare disorder characterized by dilated intestinal lymphatics and the development of protein-losing enteropathy.Patients with PIL develop hypoalbuminemia,hypocalcemia,lymphopenia and hypogammaglobulinemia,and present with bilateral lower limb edema,fatigue,abdominal pain and diarrhea.Endoscopy reveals diffusely elongated,circumferential and polypoid mucosae covered with whitish enlarged villi,all of which indicate intestinal lymphangiectasia.Diagnosis is conf irmed by characteristic tissue pathology,which includes dilated intestinal lymphatics with diffusely swollen mucosa and enlarged villi.The prevalence of PIL has increased since the introduction of capsule endoscopy.The etiology and prevalence of PIL remain unknown.Some studies have reported that several genes and regulatory molecules for lymphangiogenesis are related to PIL.We report the case of a patient with PIL involving the entire small bowel that was confirmed by capsule endoscopy and double-balloon enteroscopy-guided tissue pathology who carried a deletion on chromosome 4q25.The relationship between this deletion on chromosome 4 and PIL remains to be investigated.展开更多
目的确定有家族史鼻咽癌患者4p15．1-4q12区域等位基因杂合性丢失（loss of heterozygosity，LOH）的分布和频率，为进一步缩小该区域内易感基因的范围提供新的线索和依据。方法收集具有家族史的鼻咽癌患者石蜡包埋的活检组织标本，采...目的确定有家族史鼻咽癌患者4p15．1-4q12区域等位基因杂合性丢失（loss of heterozygosity，LOH）的分布和频率，为进一步缩小该区域内易感基因的范围提供新的线索和依据。方法收集具有家族史的鼻咽癌患者石蜡包埋的活检组织标本，采用显微切割的方法在肿瘤组织石蜡切片上分离肿瘤细胞和正常淋巴细胞，选定7个定位于4p15．1-4q12区域内的高密度微卫星位点，多重PCR扩增和丙烯酰胺凝胶电泳后，Genescan软件对各位点LOH进行分析。结果25例具家族史鼻咽癌患者中，23例在4p15．1-4q12区至少存在一个微卫星位点的LOH（92％）。其中D4S2382位点LOH的频率最高，达到56％；D4S350和D4S1547位点LOH频率均约为50％。最小共同缺失区位于位点D4S350和D4S1547之间。结论鼻咽癌4p15．1—4q12区域内的易感基因可能位于微卫星位点D4S350和D4S1547附近。展开更多
基金The National Natural Science Foundation of China, No. 30080016 and No. 30470977
文摘AIM: To search candidate tumor suppressor genes (TSGs) on chromosome 4q through detecting high loss of heterozygosity (LOH) regions in sporadic colorectal carcinoma in Chinese patients. METHODS: Thirteen fluorescent labeled polymorphic microsatellite markers were analyzed in 83 cases of colorectal carcinoma and matched normal tissue DNA by polymerase chain reaction (PCR). PCR products were eletrophoresed on an ABI 377 DNA sequencer. Genescan 3.7 and Genotype 3.7 software were used for LOH scanning and analysis. Comparison between LOH frequency and clinicopathological factors were performed by χ2 test. RESULTS: Data were collected on all informative loci. The average LOH frequency on 4q was 28.56%. The D4S2915 locus showed highest LOH frequency (36.17%). Two obvious deletion regions were detected: one between D4S3000 and D4S2915 locus (4q12-21.1), another flanked by D4S407 and D4S2939 locus (4q25-31.1). None case showed complete deletion of 4q, most cases displayed interstitial deletion pattern solely. Furthermore, compared with clinicopathological features, a significant relationship was observed between LOH frequencies on D4S3018locus. In tumors larger than 5 cm in diameter, LOH frequency was significantly higher than tumors that were less than 5 cm (56% vs 13.79%, P = 0.01). On D4S1534 locus, LOH was significantly associated with liver metastasis (80% vs 17.25%, P = 0.012). No relationship was detected on other locus compared with clinicopathologial features. CONCLUSION: By high resolution deletion mapping, two high frequency regions of LOH (4q12-21.1 and 4q25-31.1) were detected, which may contribute to locate TSGs on chromosome 4q involved in carcinogenesis and progression of sporadic colorectal carcinoma.
文摘Primary intestinal lymphangiectasia(PIL)is a rare disorder characterized by dilated intestinal lymphatics and the development of protein-losing enteropathy.Patients with PIL develop hypoalbuminemia,hypocalcemia,lymphopenia and hypogammaglobulinemia,and present with bilateral lower limb edema,fatigue,abdominal pain and diarrhea.Endoscopy reveals diffusely elongated,circumferential and polypoid mucosae covered with whitish enlarged villi,all of which indicate intestinal lymphangiectasia.Diagnosis is conf irmed by characteristic tissue pathology,which includes dilated intestinal lymphatics with diffusely swollen mucosa and enlarged villi.The prevalence of PIL has increased since the introduction of capsule endoscopy.The etiology and prevalence of PIL remain unknown.Some studies have reported that several genes and regulatory molecules for lymphangiogenesis are related to PIL.We report the case of a patient with PIL involving the entire small bowel that was confirmed by capsule endoscopy and double-balloon enteroscopy-guided tissue pathology who carried a deletion on chromosome 4q25.The relationship between this deletion on chromosome 4 and PIL remains to be investigated.
文摘目的确定有家族史鼻咽癌患者4p15．1-4q12区域等位基因杂合性丢失（loss of heterozygosity，LOH）的分布和频率，为进一步缩小该区域内易感基因的范围提供新的线索和依据。方法收集具有家族史的鼻咽癌患者石蜡包埋的活检组织标本，采用显微切割的方法在肿瘤组织石蜡切片上分离肿瘤细胞和正常淋巴细胞，选定7个定位于4p15．1-4q12区域内的高密度微卫星位点，多重PCR扩增和丙烯酰胺凝胶电泳后，Genescan软件对各位点LOH进行分析。结果25例具家族史鼻咽癌患者中，23例在4p15．1-4q12区至少存在一个微卫星位点的LOH（92％）。其中D4S2382位点LOH的频率最高，达到56％；D4S350和D4S1547位点LOH频率均约为50％。最小共同缺失区位于位点D4S350和D4S1547之间。结论鼻咽癌4p15．1—4q12区域内的易感基因可能位于微卫星位点D4S350和D4S1547附近。
