<abstract xmlns="http://www.w3.org/1999/xhtml">

<sec>
<h3>Background</h3>
<p>Thalassemia, as the most common single-gene genetic disorder, is related to a defect in the synthesis of one or more hemoglobin chains. More than 200 mutations have been identified in the β-globin gene. Globally, every susceptible racial group has its own specific spectrum of the common mutations that are well-known to a particular geographic region. On the other hand, varying numbers of diverse rare mutations may occur.</p>
</sec>
<sec>
<h3>Materials and Methods</h3>
<p>The subjects of the study included 2113 heterozygote or homozygote β-thalassemia cases selected among couples who participated in the Iranian national thalassemia screening program from January 2011 to November 2019. Molecular characterization of the β-thalassemia mutation was initially carried out by the amplification-refractory mutation system-polymerase chain reaction (ARMS–PCR) technique for common mutations, followed by sequencing, Gap PCR, and Multiple ligation-dependent probe amplification (MLPA) methods - in cases not detected by the ARMS-PCR.</p>
</sec>
<sec>
<h3>Results</h3>
<p>The existence of 39 rare and new point mutations and 4 large deletions were described in our cohort. Sicilian (-13,337bp) deletion, CD36/37 (-T), and CD15 TGG>TGA were encountered more often than the others in a decreasing order, in terms of frequency. The least frequent mutations/deletions were deletion from HBD exon 1 to HBB promoter, 619 bp deletion, Deletion from up HBBP1-Exon3 HBBP1 and up HBB-0.5Kb down HBB, CAP+8 C>A, CD37 (G>A), CD6 (-A), IVSI-2 (T>C), IVSII-705 T>G, and IVSII-772 (G>A). Each occurred once. Five mutations/variants were also determined which have not been reported previously in Iran.</p>
</sec>
<sec>
<h3>Conclusion</h3>
<p>According to the findings of the study, the Northwestern Iranian population displayed a wide variety of thalassemia allelic distributions. Identification of rare and new mutations in the β-thalassemia in the national population is beneficial for screening programs, genetic counseling, and prenatal diagnosis</p>
</sec>
</abstract>

Background
Thalassemia, as the most common single-gene genetic disorder, is related to a defect in the synthesis of one or more hemoglobin chains. More than 200 mutations have been identified in the β-globin gene. Globally, every susceptible racial group has its own specific spectrum of the common mutations that are well-known to a particular geographic region. On the other hand, varying numbers of diverse rare mutations may occur.


Materials and Methods
The subjects of the study included 2113 heterozygote or homozygote β-thalassemia cases selected among couples who participated in the Iranian national thalassemia screening program from January 2011 to November 2019. Molecular characterization of the β-thalassemia mutation was initially carried out by the amplification-refractory mutation system-polymerase chain reaction (ARMS–PCR) technique for common mutations, followed by sequencing, Gap PCR, and Multiple ligation-dependent probe amplification (MLPA) methods - in cases not detected by the ARMS-PCR.


Results
The existence of 39 rare and new point mutations and 4 large deletions were described in our cohort. Sicilian (-13,337bp) deletion, CD36/37 (-T), and CD15 TGG>TGA were encountered more often than the others in a decreasing order, in terms of frequency. The least frequent mutations/deletions were deletion from HBD exon 1 to HBB promoter, 619 bp deletion, Deletion from up HBBP1-Exon3 HBBP1 and up HBB-0.5Kb down HBB, CAP+8 C>A, CD37 (G>A), CD6 (-A), IVSI-2 (T>C), IVSII-705 T>G, and IVSII-772 (G>A). Each occurred once. Five mutations/variants were also determined which have not been reported previously in Iran.


Conclusion
According to the findings of the study, the Northwestern Iranian population displayed a wide variety of thalassemia allelic distributions. Identification of rare and new mutations in the β-thalassemia in the national population is beneficial for screening programs, genetic counseling, and prenatal diagnosis

Rare and New Mutations of B-Globin in Azari Population of Iran, a Considerable Diversity

Balkan Journal of Medical Genetics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Background
Thalassemia, as the most common single-gene genetic disorder, is related to a defect in the synthesis of one or more hemoglobin chains. More than...

Rare and New Mutations of B-Globin in Azari Population of Iran, a Considerable Diversity

Article Category: ORIGINAL ARTICLE

Publié en ligne: 02 mai 2023

Pages: 51 - 62

DOI: https://doi.org/10.2478/bjmg-2022-0016

Mots clés
Azeri Turkish Population, β-globin, Rare Mutations, Iran

© 2022 Abbasali F.H. et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Rare and New Mutations of B-Globin in Azari Population of Iran, a Considerable Diversity

Article Category: ORIGINAL ARTICLE

Publié en ligne: 02 mai 2023

Pages: 51 - 62

DOI: https://doi.org/10.2478/bjmg-2022-0016

Mots clésAzeri Turkish Population, β-globin, Rare Mutations, Iran

© 2022 Abbasali F.H. et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
Azeri Turkish Population, β-globin, Rare Mutations, Iran