* 投稿摘要: |
Previously we examined 80 diabetic patients with abnormal Hb chromatogram, followed by capillary electrophoresis and DNA sequencing analysis, and found one case with novel hemoglobin variant. In reviewing the SNP database, we confirmed this is a new identified InDel. We named this novel Hb variant “Hemoglobin-Kaohsiung Veterans General Hospital (Hb-KSVGH)”. The Hb-KSVGH chromatogram demonstrated two additional peaks with longer retention times. The peaks were located after HbA, and the percentages of each Hb component, namely, HbA0, HbA1c, HbX1, and HbX2, were 92.1%, 5.2%, 12.3%, and 0.5%, respectively. Furthermore, the electrophoresis results demonstrated an additional peak located between HbA and HbA_2. The obtained percentages for each Hb component, namely, HbA, HbA2, HbF, and HbX(E), were 87.9%, 2.0%, 0.3%, and 9.3%, respectively. The genomic DNA sequencing analysis showed that there was no genetic alteration on the α2- and β-gene. However, a noise signal was identified at 172 bp of the HBA1 gene , which indicated the possible occurrence of an insertion/deletion (InDel) event. Consequently, T-A cloning was performed on the PCR product and the results showed that the patient was heterozygous for Hb variants. Within an allele, a sequence that was 24 bp long was inserted at 171 bp, which resulted in an insertion of an additional 8 amino acid sequence between the 56th and 57th amino acid of α-1 hemoglobin. (This work was supported by Kaohsiung Veterans General Hospital Research grant VGHKS100-039) |