Loss of heterozygosity on chromosome 12p12-13 region in Chinese patients with colon carcinoma / 中华医学遗传学杂志
Chinese Journal of Medical Genetics
;
(6): 694-697, 2005.
Article
in Chinese
| WPRIM
| ID: wpr-279965
ABSTRACT
<p><b>OBJECTIVE</b>It is demonstrated that KRAS2, functioning as an oncogene, plays a critical role in carcinogenesis. However, some studies suggest that the wild type KRAS2, located in the region of 12p12.1, takes its effect as a tumor suppressor gene. This study, therefore, is aimed to investigate the loss of heterozygosity (LOH) on chromosome 12p12-13 region in 10 human colon carcinomas.</p><p><b>METHODS</b>LOH analysis of the 12p12-13 region was performed by PCR, using 11 microsatellite markers in 12p12-13 region. The relationships between LOH for each marker and clinical pathologic factors were evaluated.</p><p><b>RESULTS</b>LOH in at least one of the loci in 12p12-13 region was detected in 30% (3/10) of adjacent tissues; the highest frequency of LOH was identified at the locus of D12S1034 in 28.57% (2/7) of adjacent tissues. 60% (6/10) carcinoma tissues were found to have LOH in at least one locus in the same region; the most frequent LOH was found at the loci of D12S1034 and D12S1591, both about 42.86% (3/7). Among all samples, 3 cases were noted to have LOH in both adjacent and tumor tissues, and 3 cases were shown to have LOH only in tumor tissues. Occurrence of LOH was not correlated with sex, age, tumor size and lymph node metastasis.</p><p><b>CONCLUSION</b>Allelic loss on 12p12-13 region would influence the KRAS2 expression by reducing the gene-dosage in colon carcinogenesis.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Chromosomes, Human, Pair 12
/
China
/
Polymerase Chain Reaction
/
Proto-Oncogene Proteins p21(ras)
/
Proto-Oncogene Proteins
/
Colonic Neoplasms
/
Ras Proteins
/
Loss of Heterozygosity
/
Asian People
/
Ethnology
Type of study:
Prognostic study
Limits:
Humans
Country/Region as subject:
Asia
Language:
Chinese
Journal:
Chinese Journal of Medical Genetics
Year:
2005
Type:
Article
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