PAICS deficiency, a new defect of de novo purine synthesis resulting in multiple congenital anomalies and fatal outcome

0522814 - ÚMG 2020 RIV GB eng J - Článek v odborném periodiku
Pelet, A. - Škopová, V. - Steuerwald, U. - Barešová, V. - Zarhrate, M. - Plaza, J. - M. - Hnízda, A. - Krijt, M. - Součková, O. - Wibrand, F. - Andorsdottir, G. - Joensen, F. - Sedlák, David - Bleyer, A. J. - Kmoch, S. - Lyonnet, S. - Zikanov, M.
PAICS deficiency, a new defect of de novo purine synthesis resulting in multiple congenital anomalies and fatal outcome.
Human Molecular Genetics. Roč. 28, č. 22 (2019), s. 3805-3814. ISSN 0964-6906. E-ISSN 1460-2083
Grant CEP: GA MŠMT(CZ) LQ1604; GA MŠMT LM2015063
Institucionální podpora: RVO:68378050
Klíčová slova: aica-ribosiduria * adenylosuccinate * mutations * ribotide * adsl
Obor OECD: Genetics and heredity (medical genetics to be 3)
Impakt faktor: 5.101, rok: 2019
Způsob publikování: Omezený přístup
https://academic.oup.com/hmg/article/28/22/3805/5584440

We report for the first time an autosomal recessive inborn error of de novo purine synthesis (DNPS)-PAICS deficiency. We investigated two siblings from the Faroe Islands born with multiple malformations resulting in early neonatal death. Genetic analysis of affected individuals revealed a homozygous missense mutation in PAICS (c.158A>G, p.Lys53Arg) that affects the structure of the catalytic site of the bifunctional enzyme phosphoribosylaminoimidazole carboxylase (AIRC, EC 4.1.1.21)/phosphoribosylaminoimidazole succinocarboxamide synthetase (SAICARS, EC 6.3.2.6) (PAICS). The mutation reduced the catalytic activity of PAICS in heterozygous carrier and patient skin fibroblasts to approximately 50 and 10% of control levels, respectively. The catalytic activity of the corresponding recombinant enzyme protein carrying the mutation p.Lys53Arg expressed and purified from E. coli was reduced to approximately 25% of the wild-type enzyme. Similar to other two known DNPS defects-adenylosuccinate lyase deficiency and AICA-ribosiduria-the PAICS mutation prevented purinosome formation in the patient's skin fibroblasts, and this phenotype was corrected by transfection with the wild-type but not the mutated PAICS. Although aminoimidazole ribotide (AIR) and aminoimidazole riboside (AIr), the enzyme substrates that are predicted to accumulate in PAICS deficiency, were not detected in patient's fibroblasts, the cytotoxic effect of AIr on various cell lines was demonstrated. PAICS deficiency is a newly described disease that enhances our understanding of the DNPS pathway and should be considered in the diagnosis of families with recurrent spontaneous abortion or early neonatal death.
Trvalý link: http://hdl.handle.net/11104/0307242