A novel gain-of-function PIP4K2A mutation elevates the expression of ß-globin and aggravates the severity of α-thalassemia.
Br J Haematol
; 202(5): 1018-1023, 2023 09.
Article
en En
| MEDLINE
| ID: mdl-37423903
ABSTRACT
Haemoglobin H (Hb H) disease (intermediate status of α-thalassemia) shows marked phenotypic variability from asymptomatic to severe anaemia. Apart from the combined ß-thalassemia allele ameliorating clinical severity, reports of genetic modifier genes affecting the phenotype of Hb H disease are scarce which bring inconvenience to precise diagnosis and genetic counselling of the patients. Here, we present a novel mutation (c.948C>A, p.S316R) in the PIP4K2A gene in a female Hb H disease patient who displayed moderate anaemia and a relatively high Hb H level. Haematological analysis in her family members revealed that individuals carrying this mutation have upregulated ß-globin expression, leading to a more imbalanced ß/α-globin ratio and more Hb H inclusion bodies in peripheral red blood cells. According to functional experiments, the mutant PIP4K2A protein exhibits enhanced protein stability, increased kinase activity and a stronger regulatory effect on downstream proteins, suggesting a gain-of-function mutation. Moreover, introduction of the S316R mutation into HUDEP-2 cells increased expression of ß-globin, further inhibiting erythroid differentiation and terminal enucleation. Thus, the S316R mutation is a novel genetic factor associated with ß-globin expression, and the PIP4K2A gene is a new potential modifier gene affecting the α-thalassemia phenotype.
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Base de datos:
MEDLINE
Asunto principal:
Talasemia beta
/
Talasemia alfa
Límite:
Female
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Humans
Idioma:
En
Revista:
Br J Haematol
Año:
2023
Tipo del documento:
Article
País de afiliación:
China