Characterization of the novel heterozygous SCN5A genetic variant Y739D associated with Brugada syndrome
Genetic variants in SCN5A gene were identified in patients with various arrhythmogenic conditions including Brugada syndrome. Despite significant progress of last decades in studying the molecular mechanism of arrhythmia-associated SCN5A mutations, the understanding of relationship between genetics,...
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Elsevier
2022-07-01
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| Series: | Biochemistry and Biophysics Reports |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405580822000498 |
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| author | Anastasia K. Zaytseva Artem M. Kiselev Alexander S. Boitsov Yulia V. Fomicheva Georgii S. Pavlov Boris S. Zhorov Anna A. Kostareva |
| author_facet | Anastasia K. Zaytseva Artem M. Kiselev Alexander S. Boitsov Yulia V. Fomicheva Georgii S. Pavlov Boris S. Zhorov Anna A. Kostareva |
| author_sort | Anastasia K. Zaytseva |
| collection | DOAJ |
| description | Genetic variants in SCN5A gene were identified in patients with various arrhythmogenic conditions including Brugada syndrome. Despite significant progress of last decades in studying the molecular mechanism of arrhythmia-associated SCN5A mutations, the understanding of relationship between genetics, electrophysiological consequences and clinical phenotype is lacking. We have found a novel genetic variant Y739D in the SCN5A-encoded sodium channel Nav1.5 of a male patient with Brugada syndrome (BrS). The objective of the study was to characterize the biophysical properties of Nav1.5-Y739D and provide possible explanation of the phenotype observed in the patient. The WT and Y739D channels were heterologously expressed in the HEK-293T cells and the whole-cell sodium currents were recorded. Substitution Y739D reduced the sodium current density by 47 ± 2% at −20 mV, positively shifted voltage-dependent activation, accelerated both fast and slow inactivation, and decelerated recovery from the slow inactivation. The Y739D loss-of-function phenotype likely causes the BrS manifestation. In the hNav1.5 homology models, which are based on the cryo-EM structure of rat Nav1.5 channel, Y739 in the extracellular loop IIS1-S2 forms H-bonds with K1381 and E1435 and pi-cation contacts with K1397 (all in loop IIIS5-P1). In contrast, Y739D accepts H-bonds from K1397 and Y1434. Substantially different contacts of Y739 and Y739D with loop IIIS5-P1 would differently transmit allosteric signals from VSD-II to the fast-inactivation gate at the N-end of helix IIIS5 and slow-inactivation gate at the C-end of helix IIIP1. This may underlie the atomic mechanism of the Y739D channel dysfunction. |
| first_indexed | 2024-12-12T09:39:10Z |
| format | Article |
| id | doaj.art-0767e6e17b27496b991e0a16f9540f31 |
| institution | Directory Open Access Journal |
| issn | 2405-5808 |
| language | English |
| last_indexed | 2024-12-12T09:39:10Z |
| publishDate | 2022-07-01 |
| publisher | Elsevier |
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| series | Biochemistry and Biophysics Reports |
| spelling | doaj.art-0767e6e17b27496b991e0a16f9540f312022-12-22T00:28:37ZengElsevierBiochemistry and Biophysics Reports2405-58082022-07-0130101249Characterization of the novel heterozygous SCN5A genetic variant Y739D associated with Brugada syndromeAnastasia K. Zaytseva0Artem M. Kiselev1Alexander S. Boitsov2Yulia V. Fomicheva3Georgii S. Pavlov4Boris S. Zhorov5Anna A. Kostareva6Almazov National Medical Research Centre, St. Petersburg, 197341, Russia; Sechenov Institute of Evolutionary Physiology & Biochemistry, Russian Academy of Sciences, St. Petersburg, 194223, Russia; Corresponding author. Almazov National Medical Research Centre, St. Petersburg, 197341, Russia.Almazov National Medical Research Centre, St. Petersburg, 197341, Russia; Institute of Cytology, Russian Academy of Sciences, Saint Petersburg, RussiaAlmazov National Medical Research Centre, St. Petersburg, 197341, RussiaAlmazov National Medical Research Centre, St. Petersburg, 197341, RussiaAlmazov National Medical Research Centre, St. Petersburg, 197341, RussiaAlmazov National Medical Research Centre, St. Petersburg, 197341, Russia; Sechenov Institute of Evolutionary Physiology & Biochemistry, Russian Academy of Sciences, St. Petersburg, 194223, Russia; Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, L8S 4K1, CanadaAlmazov National Medical Research Centre, St. Petersburg, 197341, Russia; Department of Woman and Child Health, Karolinska Institute, Stockholm, 17176, SwedenGenetic variants in SCN5A gene were identified in patients with various arrhythmogenic conditions including Brugada syndrome. Despite significant progress of last decades in studying the molecular mechanism of arrhythmia-associated SCN5A mutations, the understanding of relationship between genetics, electrophysiological consequences and clinical phenotype is lacking. We have found a novel genetic variant Y739D in the SCN5A-encoded sodium channel Nav1.5 of a male patient with Brugada syndrome (BrS). The objective of the study was to characterize the biophysical properties of Nav1.5-Y739D and provide possible explanation of the phenotype observed in the patient. The WT and Y739D channels were heterologously expressed in the HEK-293T cells and the whole-cell sodium currents were recorded. Substitution Y739D reduced the sodium current density by 47 ± 2% at −20 mV, positively shifted voltage-dependent activation, accelerated both fast and slow inactivation, and decelerated recovery from the slow inactivation. The Y739D loss-of-function phenotype likely causes the BrS manifestation. In the hNav1.5 homology models, which are based on the cryo-EM structure of rat Nav1.5 channel, Y739 in the extracellular loop IIS1-S2 forms H-bonds with K1381 and E1435 and pi-cation contacts with K1397 (all in loop IIIS5-P1). In contrast, Y739D accepts H-bonds from K1397 and Y1434. Substantially different contacts of Y739 and Y739D with loop IIIS5-P1 would differently transmit allosteric signals from VSD-II to the fast-inactivation gate at the N-end of helix IIIS5 and slow-inactivation gate at the C-end of helix IIIP1. This may underlie the atomic mechanism of the Y739D channel dysfunction.http://www.sciencedirect.com/science/article/pii/S2405580822000498Brugada syndromeSodium channelSCN5ASodium channelopathiesHomology modeling |
| spellingShingle | Anastasia K. Zaytseva Artem M. Kiselev Alexander S. Boitsov Yulia V. Fomicheva Georgii S. Pavlov Boris S. Zhorov Anna A. Kostareva Characterization of the novel heterozygous SCN5A genetic variant Y739D associated with Brugada syndrome Biochemistry and Biophysics Reports Brugada syndrome Sodium channel SCN5A Sodium channelopathies Homology modeling |
| title | Characterization of the novel heterozygous SCN5A genetic variant Y739D associated with Brugada syndrome |
| title_full | Characterization of the novel heterozygous SCN5A genetic variant Y739D associated with Brugada syndrome |
| title_fullStr | Characterization of the novel heterozygous SCN5A genetic variant Y739D associated with Brugada syndrome |
| title_full_unstemmed | Characterization of the novel heterozygous SCN5A genetic variant Y739D associated with Brugada syndrome |
| title_short | Characterization of the novel heterozygous SCN5A genetic variant Y739D associated with Brugada syndrome |
| title_sort | characterization of the novel heterozygous scn5a genetic variant y739d associated with brugada syndrome |
| topic | Brugada syndrome Sodium channel SCN5A Sodium channelopathies Homology modeling |
| url | http://www.sciencedirect.com/science/article/pii/S2405580822000498 |
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