Abstract:
:B-cell precursor acute lymphoblastic leukaemia (B-ALL) is a malignancy of lymphoid progenitor cells with altered genes including the Janus kinase (JAK) gene family. Among them, tyrosine kinase 2 (TYK2) is involved in signal transduction of cytokines such as interferon (IFN) α/β through IFN-α/β receptor alpha chain (IFNAR1). To search for disease-associated TYK2 variants, bone marrow samples from 62 B-ALL patients at diagnosis were analysed by next-generation sequencing. TYK2 variants were found in 16 patients (25.8%): one patient had a novel mutation at the four-point-one, ezrin, radixin, moesin (FERM) domain (S431G) and two patients had the rare variants rs150601734 or rs55882956 (R425H or R832W). To functionally characterise them, they were generated by direct mutagenesis, cloned in expression vectors, and transfected in TYK2-deficient cells. Under high-IFNα doses, the three variants were competent to phosphorylate STAT1/2. While R425H and R832W induced STAT1/2-target genes measured by qPCR, S431G behaved as the kinase-dead form of the protein. None of these variants phosphorylated STAT3 in in vitro kinase assays. Molecular dynamics simulation showed that TYK2/IFNAR1 interaction is not affected by these variants. Finally, qPCR analysis revealed diminished expression of TYK2 in B-ALL patients at diagnosis compared to that in healthy donors, further stressing the tumour immune surveillance role of TYK2.
journal_name
Genes (Basel)journal_title
Genesauthors
Turrubiartes-Martínez E,Bodega-Mayor I,Delgado-Wicke P,Molina-Jiménez F,Casique-Aguirre D,González-Andrade M,Rapado I,Camós M,Díaz-de-Heredia C,Barragán E,Ramírez-Orellana M,Aguado B,Figuera Á,Martínez-López J,Fernández-Ruizdoi
10.3390/genes11121434subject
Has Abstractpub_date
2020-11-28 00:00:00issue
12issn
2073-4425pii
genes11121434journal_volume
11pub_type
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