Open AccessAnalysis of genotype–phenotype correlation in patients with α‐thalassemia from Fujian province, Southeastern China
Author(s) -
Pan Yali,
Chen Meihuan,
Zhang YanHong,
Zhang Min,
Chen Lingji,
Lin Na,
Xu Liangpu,
Huang Hailong
Publication year - 2022
Publication title -
journal of clinical laboratory analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.536
H-Index - 50
eISSN - 1098-2825
pISSN - 0887-8013
DOI - 10.1002/jcla.24696
Subject(s) - genotype , thalassemia , mutation , genetics , medicine , hemoglobin , biology , phenotype , gene
Background There is a high carrying rate of α‐thalassemia in Fujian province. However, there are few large‐scale studies on the correlation between genotype and phenotype in Fujian province. The purpose of this study was to analyze the phenotype and genotype in a cohort of 2923 patients with α‐thalassemia in Fujian province, so as to provide reference data for screening and diagnosis of α‐thalassemia in Fujian province. Methods The genotype of α‐thalassemia was detected by PCR reverse dot blot assay, gap‐PCR, single PCR, nested PCR, and sequencing. Clinical and hematological indices of 2923 patients were collected, and the correlation between genotype and phenotype was analyzed. Results Among 10,350 patients, 2923 cases were found with α‐thalassemia, with a detection rate of 28.24%. Among them, ‐‐ SEA /αα was the most common genotype, accounting for 64.80%. In addition, rare α‐thalassemia genotypes were detected in Fujian province, including ‐‐ THAI /αα (0.41%), HKαα/‐‐ SEA (0.03%), and the novel α‐thalassemia gene mutation CD5 (GCC>ACC) (HGVS named HBA1: c.16G>A) (0.03%). Patients with deletional genotypes of α‐thalassemia were found to have higher RBC and lower Hb, MCV, MCH, and HbA2 than patients with non‐deletional genotypes of α‐thalassemia ( p < 0.05). Conclusion The clinical phenotype of α‐thalassemia is influenced by molecular mechanisms. HBA1: c.16G>A mutation is a novel mutation that was first reported in Fujian province, which enriches the human hemoglobin mutation spectrum.