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Detection of hemoglobin H disease by long molecule sequencing
Youqiong Li1, Liang Liang1, Ting Qin1
1Center for Medical Genetics and Prenatal Diagnosis, People Hospital of Guangxi Zhuang Autonomous Region, Nanning, China.
Journal of Clinical Laboratory Analysis
|September 5, 2022
Summary
Long molecule sequencing (LMS) offers a highly accurate method for detecting Hemoglobin H (Hb H) disease, a severe form of alpha-thalassemia. This advanced technique reliably identifies both common and rare genetic mutations, improving upon traditional diagnostic approaches.
Area of Science:
- Genetics
- Molecular Biology
- Hematology
Background:
- Hemoglobin H (Hb H) disease is a significant form of alpha-thalassemia (α-thal) requiring management, sometimes including transfusions.
- Routine diagnostic methods may fail to detect rare Hb H disease genotypes.
- Long molecule sequencing (LMS) presents a novel approach for Hb H disease detection.
Purpose of the Study:
- To evaluate the efficacy of long molecule sequencing (LMS) for detecting Hemoglobin H (Hb H) disease.
- To compare the accuracy of LMS against established methods like Gap-PCR and PCR-Reverse dot blot hybridization (PCR-RDB).
Main Methods:
- 206 known genotype samples were analyzed using LMS on the PacBio Sequel platform.
- Circular consensus sequencing reads were aligned to the hg19 reference genome.
- LMS performance was benchmarked against Gap-PCR and PCR-RDB.
Main Results:
- LMS demonstrated 100% accuracy in detecting both deletion and point mutations compared to routine methods.
- LMS identified six mutations missed by routine methods and corrected three diagnoses.
- Two cases of Hb H disease were misdiagnosed by routine methods but correctly identified by LMS.
Conclusions:
- Long molecule sequencing is a rapid and reliable assay for identifying hemoglobinopathy carriers.
- LMS accurately detects common and rare genotypes of Hemoglobin H disease, enhancing diagnostic capabilities.
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