摘要目的 分析血红蛋白Constant Spring(hemoglobin Constant Spring,HbCS)携带者基因型和表现型的关系,探讨HbCS对血液学指标的影响规律.方法 检测HbCS携带者的血常规和血红蛋白电泳.采用跨越断裂点-PCR、反向点杂交方法确认α-、β-地中海贫血(以下简称地贫)突变.结果 HbCS合并--SEA/αα或HbQS表现为HbH病的特征,与αCSα/-α或HbCS杂合子比较,差异有显著的统计学意义.αCSα/-α与HbCS杂合子对表型的影响较小.HbCS合并β地中海贫血,其血液学表型表现为β地贫的特征.上述各型变异阳性病例中,仅有57.6%的样品血红蛋白电泳检测为阳性结果.结论 HbCS杂合子与其它类型地贫突变合并存在时,不同基因型组合可出现较大差异的表型变化.另外,对此类复合地贫仅用血红蛋白电泳较易漏诊和误诊,对其确诊需要依赖基因型分析.

abstractsObjective To analyze the genotype-phenotype correlations in the Hb Constant Spring (HbCS) carriers, and to investigate the effect of HbCS on hematologic parameters. Methods Complete blood cell count and hemoglobin electrophoresis analyses were performed in 125 HbCS cases. The α-and β-thalassemia mutations were determined by reverse dot-blotting and Gap-PCR. Results The presence of the SEA deletion or Hb Quong Sze (HbQS) with HbCS leads to HbH-CS disease. There was significant difference between HbH-CS and αCSα/-α, HbH-CS and αCS α/αα in the hematological parameters. The genotype of αCSα/-α or αα/αCSα had slight effect on hematological parameters. When the Hb Constant Spring mutation co-existed with heterozygous β-thalassemia, the hematological characteristics of β-thalassemia was presented. Only 57.6% of carriers with HbCS were detected by hemoglobin electrophoresis. Conclusion The cases with co-existence of HbCS trait and other α-thalassemia trait, or β-thalassemia trait, showed variation in their red blood cell parameters. For such compound heterozygotes for HbCS and other α- or β-thalassaemia mutations, which were usually misdiagnosed in clinical screening by hemoglobin electrophoresis, accurate diagnose can be made by molecular diagnosis.