Three novel HBB mutations, c.‐140C>G (‐90 C>G), c.237_256del GGACAACCTCAAGGGCACCT ( FS Cd 78/85 ‐20 bp), and c.315+2T>G ( IVS 2:2 T>G). Update of the mutational spectrum of β‐Thalassemia in Mexican mestizo patients
Abstract Introduction Beta‐thalassemia (β‐thal) is frequent in Mexican patients with microcytosis and hypochromia. We report three novel mutations and analyze the actual mutational spectrum in Mexican population. Methods One hundred and forty‐nine β‐thal Mexican mestizo patients were studied (154 al...
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Published in | International journal of laboratory hematology Vol. 39; no. 5; pp. 539 - 545 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
01.10.2017
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Online Access | Get full text |
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Summary: | Abstract
Introduction
Beta‐thalassemia (β‐thal) is frequent in Mexican patients with microcytosis and hypochromia. We report three novel mutations and analyze the actual mutational spectrum in Mexican population.
Methods
One hundred and forty‐nine β‐thal Mexican mestizo patients were studied (154 alleles).
ARMS
‐
PCR
was performed to identify Cd39C>T,
IVS
1:1G>A,
IVS
1:110G>A, ‐28A>C, initiation codonA>G and
IVS
1:5G>A mutations, and gap‐
PCR
for δβ‐thal Spanish type.
DNA
sequencing of
HBB
gene was carried out in negative samples for the initial screening.
Results
Fifteen different
HBB
gene mutations were observed in 148 alleles; three of them are novel: ‐90C>G, 20 bp deletion (at codons 78/85), and
IVS
2:2T>G; the mutation
IVS
1:6T>C that was observed for first time in our population; and eleven previously described mutations. Six alleles showed normal
HBB
sequence. To date, a total of 21 different mutations have been observed in Mexican patients; the four most frequent mutations are of Mediterranean origin: Cd39C>T (37.2%),
IVS
1:1G>A (17.3%),
IVS
1:110G>A (13.9%), and δβ‐thal Spanish type (9.0%), which represent 77.4% of the total studied alleles.
Conclusion
Considering the novel mutations ‐90C>G, ‐20 bp Cd78/85,
IVS
2:2T>G and the first observation of
IVS
1:6T>C, the molecular spectrum of β‐thal in Mexicans comprises 21 different mutations, confirming the high allelic heterogeneity in Mexicans. |
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ISSN: | 1751-5521 1751-553X |
DOI: | 10.1111/ijlh.12692 |