Point mutations which should not be overlooked in Hb H disease
Related Experiment Video
Updated: Mar 30, 2026
Targeted in Situ Mutagenesis of Histone Genes in Budding Yeast
Published on: January 26, 2017
Samaneh Farashi1,2, Nooshin Bayat2, Shadi Vakili2
1a Genetics Research Center , University of Social Welfare & Rehabilitation Sciences , Tehran , Iran.
Insights
Hb H disease, a form of alpha-thalassemia, involves anemia due to gene mutations. Point mutations often cause more severe symptoms than deletions, highlighting the need for genetic counseling and prenatal diagnosis in high-risk families.
Area of Science:
- Hematology
- Genetics
- Molecular Biology
Background:
- Hb H disease is a significant alpha-thalassemia syndrome.
- It is characterized by chronic hemolytic anemia.
- This condition arises from the loss of function in three out of four alpha-globin genes due to deletions or mutations.
Purpose of the Study:
- To describe 66 patients diagnosed with Hb H disease over five years.
- To analyze the correlation between genotype and phenotype severity.
- To emphasize the clinical importance of specific point mutations for health management.
Main Methods:
- Retrospective analysis of 66 diagnosed Hb H disease patients.
- Genotyping to identify deletional and non-deletional alpha-globin mutations.
- Phenotypic assessment of clinical manifestations.
Main Results:
- Patients exhibited diverse clinical phenotypes.
- Genotypes included various deletional, non-deletional mutations, and compound heterozygosity.
- Point mutations were associated with more severe disease phenotypes compared to deletional forms.
Conclusions:
- Certain point mutations are responsible for severe Hb H disease in the Iranian population.
- Prenatal diagnosis is crucial for high-risk couples.
- Effective health management strategies are informed by genotype-phenotype correlations.
Background:
Hb H disease is an alpha-thalassemia (α-thal) syndrome characterized by chronic hemolytic anemia that occurs when three of total four α-globin genes lost their function due to completely deletions or different kind of mutations.
Objective:
We here described 66 patients who have been diagnosed for Hb H disease during the last five years in our center. The genotypes involving point mutations present more severe phenotype than deletional forms that make them of primary important to health management.
Study Design:
Hb H subjects carry different α-globin genotypes including deletional and non-deletional mutations showing heterogenous clinical manifestations.
Results:
The Hb H patients presenting a wide range of phenotype carried different deletional, non-deletional mutations or compound heterozygosity of them.
Conclusion:
We emphasize the importance of some point mutations responsible for more severe form of Hb H disease in Iranian population and the necessity for consideration of prenatal diagnosis (PND) in high-risk couples.
More Related Videos
03:45Investigating the Pathogenesis of MYH7 Mutation Gly823Glu in Familial Hypertrophic Cardiomyopathy using a Mouse Model
Published on: August 8, 2022
12:04Engineering Oncogenic Heterozygous Gain-of-Function Mutations in Human Hematopoietic Stem and Progenitor Cells
Published on: March 10, 2023
Related Concept Videos
01:30Point and Frameshift Mutations
01:39Mutations
01:35Mutations
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
01:39Mutations
02:18Alternative RNA Splicing
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
01:31Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of...