LOSS OF HETEROZYGOSITY ON THE SHORT ARM OF CHROMOSOME-3 IN NASOPHARYNGEAL CARCINOMA

LOSS OF HETEROZYGOSITY ON THE SHORT ARM OF CHROMOSOME-3 IN NASOPHARYNGEAL CARCINOMA
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DOI:
10.1016/0165-4608(91)90035-s
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发表时间:
1991-07-01
影响因子:
--
通讯作者:
LEE, JCK
LEE, JCK
中科院分区:
其他
文献类型:
--
作者:
HUANG, DP;LO, KW;LEE, JCK

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肿瘤类型中特定染色体位点内的组成性杂合性持续丧失提示在该肿瘤的发生中存在重要的肿瘤抑制基因。 我们研究了这种基因改变是否与鼻咽癌(NPC)的发生有关。 使用 3 号染色体特异性多态性探针对 11 名中国香港原发性鼻咽癌 I 至 IV 期患者的肿瘤和匹配的血液白细胞 DNA 进行限制性片段长度多态性 (RFLP) 分析。 此类探针被分配至染色体区域 3p25 (RAF-1)、3p24-22.1 (ERBA-beta)、3p21 (DNF15S2)、3p14 (D3S3) 和 3q12 (D3S1)。 断点因肿瘤而异,范围从 3p21-14 不等。 然而,在所有可评估的 NPC 患者中,在两个染色体基因座上观察到杂合性完全丧失的频率为 100%:RAF-1 基因座(3p25 的 10 例中的​​ 10 例)和 D3S3 基因座(3p14 的 9 例中的 9 例),表明在这些定义的区域内或附近存在假定的肿瘤抑制基因。 在 NPC 病例中观察到 3 号染色体短臂上等位基因的一致缺失,这与我们之前报道和目前的细胞遗传学发现一致,可能代表了 NPC 多步发生中的一个关键事件。 本报告还确定了 NPC 家族连锁研究的明确基因座。
A consistent loss of constitutional heterozygosity within a specific chromosome locus in a tumor type is suggestive of a tumor suppressor gene important in the genesis of that tumor. We studied whether such genetic alterations are involved in the development of nasopharyngeal carcinoma (NPC). Tumor and matched blood leukocytes DNA from eleven Hong Kong Chinese patients with primary NPC stages I to IV were subjected to restriction fragment length polymorphism (RFLP) analysis using chromosome 3-specific polymorphic probes. Such probes are assigned to chromosomal region 3p25 (RAF-1), 3p24-22.1 (ERBA-beta), 3p21 (DNF15S2), 3p14 (D3S3), and 3q12 (D3S1). The breakpoint varied among tumors, ranging in extent from 3p21-14. However, 100% frequency of complete loss of heterozygosity was observed at two chromosomal loci: RAF-1 locus (ten of ten cases at 3p25) and D3S3 locus (nine of nine cases at 3p14), in all evaluable NPC patients, suggesting the presence of putative tumor suppressor gene(s) within or close to these defined regions. The observed consistent deletion of alleles on the short arm of chromosome 3 in the NPC cases, which is in line with our previously reported and present cytogenetic findings, may represent a critical event in the multistep genesis of NPC. The present report also identifies defined loci for linkage studies on NPC families.