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Terapia génica dual específica: Un nuevo enfoque para el síndrome de Dravet

En la Fundación Síndrome de Dravet, siempre estamos atentos a los avances científicos que puedan ofrecer esperanza y soluciones a nuestra comunidad. Hoy queremos compartir con vosotros un estudio reciente liderado por el profesor Franck Kalume, miembro de nuestro Comité Científico, que representa un paso emocionante hacia una nueva estrategia de terapia génica para el síndrome de Dravet. Publicado bajo el título “Interneuron-specific dual-AAV SCN1A gene replacement corrects epileptic phenotypes in mouse models of Dravet syndrome “, este trabajo demuestra cómo una terapia génica innovadora podría corregir la causa subyacente de la enfermedad. A continuación, os explicamos en qué consiste este avance y qué significa para el futuro.

El síndrome de Dravet y el reto del SCN1A

El síndrome de Dravet es una encefalopatía epiléptica y del desarrollo que comienza en el primer año de vida, caracterizada por crisis epilépticas resistentes a los tratamientos, retrasos en el desarrollo, discapacidad intelectual y un riesgo significativo de muerte prematura, a menudo por muerte súbita inesperada en epilepsia (SUDEP). Más del 80% de los pacientes tienen mutaciones en el gen SCN1A, que codifica el canal de sodio NaV1.1, esencial para el funcionamiento de las interneuronas inhibidoras del cerebro. Estas células son clave para mantener el equilibrio entre la excitación y la inhibición en el cerebro, y su disfunción es la raíz de muchos de los síntomas del síndrome.

Hasta ahora, no existe un tratamiento aprobado que corrija directamente esta pérdida de función del SCN1A. Los fármacos disponibles pueden aliviar algunos síntomas, pero no abordan la causa subyacente. Este nuevo estudio propone una solución innovadora: una terapia génica que repone el gen SCN1A específicamente en las interneuronas, utilizando virus adeno-asociados (AAV) como vehículos.

Una estrategia creativa para superar límites

El desafío principal para desarrollar una terapia génica con AAV, el vector viral más utilizado en terapia génica, es que el gen SCN1A es demasiado grande y no entra en un solo virus, ya que el AAV tiene un límite de tamaño de aproximadamente 4.7 kb, mientras que el SCN1A humano mide 6 kb. Los investigadores superaron esta barrera dividiendo el gen en dos partes y utilizando una técnica llamada “split-intein” para unirlas dentro de las células objetivo, reconstruyendo un canal NaV1.1 funcional y completo. Además, emplearon un potenciador específico (DLX2.0) que asegura que el gen se exprese solo en las interneuronas GABAérgicas del telencéfalo, las células más afectadas en el síndrome de Dravet.

Resultados esperanzadores en modelos animales

El equipo probó esta terapia en varios modelos animales con mutaciones en Scn1a, que replican las características del síndrome de Dravet humano. Los resultados son impresionantes:

  1. Protección contra la muerte prematura: En ratones tratados con la terapia génica dual (ambas mitades del gen), el 100% sobrevivió más allá de los 70 días, e incluso hasta un año en algunos casos, mientras que los ratones no tratados o con tratamientos de control mostraron una mortalidad del 50% o más.
  2. Reducción de crisis epilépticas: La terapia protegió a los ratones de crisis epilépticas inducidas por calor (similares a las desencadenadas por fiebre en pacientes) y disminuyó significativamente las crisis epilépticas espontáneas, según registros de electrocorticografía.
  3. Especificidad y seguridad: Cuando el gen se dirigió solo a las interneuronas, no se observaron efectos tóxicos en ratones sanos ni en los tratados. Sin embargo, cuando se usó un promotor no selectivo (hSyn1) que expresó SCN1A en todo tipo de neuronas, hubo toxicidad y menos eficacia, subrayando la importancia de la precisión en el enfoque.

Estos hallazgos se replicaron en dos centros de investigación independientes y con diferentes modelos de ratones, lo que refuerza la solidez de los resultados.

¿Qué significa esto para las familias?

Este estudio es una prueba de concepto: demuestra que dividir en dos y recomponer SCN1A en las interneuronas puede corregir los síntomas principales del síndrome de Dravet en ratones. Aunque aún estamos lejos de un tratamiento humano, este avance abre una puerta hacia el desarrollo de una nueva tecnología de terapia génica para el síndrome de Dravet. Algunos retos pendientes incluyen adaptar esta técnica para el cerebro humano, que es mucho más grande y complejo que el de un ratón, y garantizar una distribución adecuada del virus. También será crucial determinar si esta estrategia podría mejorar otros síntomas, como los déficits cognitivos o los problemas motores, además de las crisis epilépticas.

Un paso hacia el futuro

En la Fundación Síndrome de Dravet, celebramos cada avance que nos acerca a un futuro donde esta enfermedad pueda ser controlada o incluso curada. Este estudio nos llena de optimismo y refuerza la importancia de apoyar la investigación científica. Seguiremos informándoos sobre los progresos en este campo y trabajando incansablemente para mejorar la calidad de vida de las personas con síndrome de Dravet y sus familias.

Si queréis profundizar en los detalles técnicos, el artículo está disponible aquí.

Un sueño, una meta.

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TERMS & CONDITIONS

The Dravet Syndrome Conference 2023 is organised by Dravet Syndrome Foundation Spain, whose registered office is located at Calle Doctor Fleming, 30, 28036 Madrid, Spain.

The conference shall take place at the Official College of Nursing of Madrid, at Avenida de Menéndez Pelayo, 93, 28007 Madrid, Spain, on Thursday 23rd of March 2023. Attendance to this conference is free of charge, but mandatory for organisational reasons.

Participants must register online at www.dravetconference.com. Upon registration, each participant will receive an electronic confirmation by email. On-site registration will not be be possible. If a participant has not received the official email registration confirmation within 3 days, they must contact the conference secretariat at [email protected].

The conference registration includes: Attendance to all sessions, oral and visual presentations, all coffee and lunch breaks, and conference documentation with all information about the event. The registration does not include travel and accommodation costs or any other personal expenses.

Admittance to the conference without registration cannot be granted.

Conference Attendance
Upon arrival at the Official College of Nursing of Madrid the day of the event, all participants have to check-in at the onsite Conference Registration Desk. The desk will open on 23rd of March at 8:30 a.m. Upon registration onsite, the conference team will provide participants with information about the event and a badge, which should be worn visibly at all times. The personalised badge authorises participants to attend all conference sessions, and lunch and coffee breaks.

Cancellation Policy
Dravet Syndrome Foundation Spain reserves the right to cancel any registration forthwith and without liability on its part in the event of any damage to, or destruction of the venue by fire, shortage of labour, strikes, industrial unrest, public health measures, or any other cause beyond the control of the Dravet Syndrome Foundation Spain, which shall prevent it from performing its obligations. In these circumstances, every effort will be made to find an alternative format/venue or propose a new date for the conference. Should the conference be cancelled for any reason, airfares, hotels, or other costs incurred by the participants are not reimbursed by the Dravet Syndrome Foundation Spain.

Any participant is allowed to cancel his/her registration but must notify this to the conference organisers by e-mail at [email protected] within a minimum of 10 days prior the event. Failure to attend the event without prior written notification by email may incur a no-show fee, which shall cover individual organizational, material and catering costs.

Name Change
All registrations are only valid for the respective person mentioned in the form. A registered participant unable to attend the conference may nominate (free of charge) a substitute participant by notifying the conference organisers by email at [email protected] before 16th of March 2023. The procedure allows giving the last name, first name, and email address of the new participant.

Personal Data
Upon registration, the participant authorises Dravet Syndrome Foundation Spain to use their personal data stated above to inform the participant of any further conferences, events, or information concerning the conference and Dravet Syndrome Foundation Spain’s activities. The conference booklet online will only contain authors, titles, and affiliations of submitted abstracts, but no full abstract texts. The conference printed booklet will contain full abstract texts from all participants. Conference certificates will be sent to the participants as a PDF document upon request at [email protected]. Only the name & affiliation will be stated in the certificate, not the email addresses of the participants.

Information is collected by an automated computer system that manages registrations. Security and confidentiality are guaranteed by state-of-the-art technical tools. However, Dravet Syndrome Foundation Spain declines any responsibility concerning data security transmitted through the internet.

Photography
The conference is held in public; therefore, we do not ban participants, exhibitors, partners and other companies from taking photographs of conference activities and participants, and share it via social media. By participating in the conference, you approve that general pictures will be taken and used for our Social Media output, our websites and other communication purposes. You hereby waive any right to oppose, and expressly authorise the organiser to make them available on the Internet or as it may seem fit. Author’s presentation slides shall not be photographed by any conference participant. 

Disclaimer
The conference organiser cannot be held responsible for any loss, injury or damage to any property, whatever the cause may be. Should, for any reason outside the organiser’s control (e.g., political or economic circumstances or a case of ‘force majeure’), the venue or speakers change, or the event be cancelled, the organiser will endeavour to reschedule, but shall not be held responsible for any costs, damages or expenses incurred by the participants. If for any reason the organiser decides to make material changes to this conference, the organiser is not responsible for airfares, hotels or other costs incurred by the participants. The participant takes part in the conference, all tours, and trips at his own risk.

Copyright
The participant is allowed to use the conference documentation exclusively for his/her personal needs.

TERMS & CONDITIONS

The European Dravet Syndrome Advanced Therapies (EDSAT) Meeting 2023 is organised by Dravet Syndrome Foundation Spain, whose registered office is located at Calle Doctor Fleming, 30, 28036 Madrid, Spain.

The conference shall take place at the Official College of Nursing of Madrid, at Avenida de Menéndez Pelayo, 93, 28007 Madrid, Spain, on Friday 24th of March 2023. Attendance to this conference is free of charge, but mandatory for organisational reasons.

Participants must register online at www.dravetconference.com. Upon registration, each participant will receive an electronic confirmation by email. On-site registration will not be be possible. If a participant has not received the official email registration confirmation within 3 days, they must contact the conference secretariat at [email protected].

The conference registration includes: Attendance to all sessions, oral and visual presentations, all coffee and lunch breaks, and conference documentation with all information about the event. The registration does not include travel and accommodation costs or any other personal expenses.

Admittance to the conference without registration cannot be granted.

Conference Attendance
Upon arrival at the Official College of Nursing of Madrid the day of the event, all participants have to check-in at the onsite Conference Registration Desk. The desk will open on 24th of March at 8:30 a.m. Upon registration onsite, the conference team will provide participants with information about the event and a badge, which should be worn visibly at all times. The personalised badge authorises participants to attend all conference sessions, and lunch and coffee breaks.

Cancellation Policy
Dravet Syndrome Foundation Spain reserves the right to cancel any registration forthwith and without liability on its part in the event of any damage to, or destruction of the venue by fire, shortage of labour, strikes, industrial unrest, public health measures, or any other cause beyond the control of the Dravet Syndrome Foundation Spain, which shall prevent it from performing its obligations. In these circumstances, every effort will be made to find an alternative format/venue or propose a new date for the conference. Should the conference be cancelled for any reason, airfares, hotels, or other costs incurred by the participants are not reimbursed by the Dravet Syndrome Foundation Spain.

Any participant is allowed to cancel his/her registration but must notify this to the conference organisers by e-mail at [email protected] within a minimum of 10 days prior the event. Failure to attend the event without prior written notification
by email may incur a no-show fee, which shall cover individual organizational, material and catering costs.

Name Change
All registrations are only valid for the respective person mentioned in the form. A registered participant unable to attend the conference may nominate (free of charge) a substitute participant by notifying the conference organisers by email at [email protected] before 17th of March 2023. The procedure allows giving the last name, first name, and email address of the new participant.

Personal Data
Upon registration, the participant authorises Dravet Syndrome Foundation Spain to use their personal data stated above to inform the participant of any further conferences, events, or information concerning the conference and Dravet Syndrome Foundation Spain’s activities. The conference booklet online will only contain authors, titles, and affiliations of submitted abstracts, but no full abstract texts. The conference printed booklet will contain full abstract texts from all participants. Conference certificates will be sent to the participants as a PDF document upon request at [email protected]. Only the name & affiliation will be stated in the certificate, not the email addresses of the participants.

Information is collected by an automated computer system that manages registrations. Security and confidentiality are guaranteed by state-of-the-art technical tools. However, Dravet Syndrome Foundation Spain declines any responsibility concerning data security transmitted through the internet.

Photography
The conference is held in public; therefore, we do not ban participants, exhibitors, partners and other companies from taking photographs of conference activities and participants, and share it via social media. By participating in the conference, you approve that general pictures will be taken and used for our Social Media output, our websites and other communication purposes. You hereby waive any right to oppose, and expressly authorise the organiser to make them available on the Internet or as it may seem fit. Author’s presentation slides shall not be photographed by any conference participant.

Disclaimer
The conference organiser cannot be held responsible for any loss, injury or damage to any property, whatever the cause may be. Should, for any reason outside the organiser’s control (e.g., political or economic circumstances or a case of ‘force majeure’), the venue or speakers change, or the event be cancelled, the organiser will endeavour to reschedule, but shall not be held responsible for any costs, damages or expenses incurred by the participants. If for any reason the organiser decides to make material changes to this conference, the organiser is not responsible for airfares, hotels or other costs incurred by the participants. The participant takes part in the conference, all tours, and trips at his own risk.

Copyright
The participant is allowed to use the conference documentation exclusively for his/her personal needs.

TERMS & CONDITIONS

The European Dravet Syndrome Advanced Therapies (EDSAT) Meeting 2022 is organised by Dravet Syndrome Foundation Spain, whose registered office is located at Calle Doctor Fleming, 30, 28036 Madrid, Spain.

The conference shall take place at the Illustrious Official College of Physicians of Madrid, at Calle de Santa Isabel, 51, 28012 Madrid, Spain, on Friday 1st of April 2022. Attendance to this conference is free of charge, but mandatory for organisational reasons. Participants must register online at www.dravetconference.com. Upon registration, each participant will receive an electronic confirmation by email. On-site registration will not be be possible. If a participant has not received the official email registration confirmation within 3 days, they must contact the conference secretariat at [email protected].

The conference registration includes: Attendance to all sessions, oral and visual presentations, all coffee and lunch breaks, and conference documentation with all information about the event. The registration does not comprise travelling and accommodation costs or any other personal expenses.

Admittance to the workshop without registration cannot be granted.

Conference Attendance
Upon arrival at the Illustrious Official College of Physicians of Madrid the day of the event, all participants have to register at the onsite Conference Registration Desk. The desk will open on 1st of April at 8:30 a.m. Upon registration onsite, the conference team will provide participants with information about the event and a badge, which should be worn visibly at all times. The personalised badge authorises participants to attend all conference sessions, and lunch and coffee breaks.

Cancellation Policy
Dravet Syndrome Foundation Spain reserves the right to cancel any registration forthwith and without liability on its part in the event of any damage to, or destruction of the venue by fire, shortage of labour, strikes, industrial unrest, public health measures, or any other cause beyond the control of the Dravet Syndrome Foundation Spain, which shall prevent it from performing its obligations. In these circumstances, every effort will be made to find an alternative format/venue or propose a new date for the conference. Should the conference be cancelled for any reason, airfares, hotels, or other costs incurred by the participants are not reimbursed by the Dravet Syndrome Foundation Spain.

Any participant is allowed to cancel his/her registration but must notify this to the conference organisers by e-mail at [email protected] within a minimum of 10 days
prior the event. Failure to attend the event without prior written notification
by email may incur a no-show fee, which shall cover individual organizational,
material and catering costs.

Name Change
All registrations are only valid for the respective person mentioned in the form. A registered participant unable to attend the conference may nominate (free of charge) a substitute participant by notifying the conference organisers by email at [email protected] before 24th of March 2022. The procedure allows giving the last name, first name, and email address of the new participant.

Personal Data
Upon registration, the participant authorises Dravet Syndrome Foundation Spain to use their personal data stated above to inform the participant of any further conferences, events, or information concerning the conference and Dravet Syndrome Foundation Spain’s activities. The conference booklet online will only contain authors, titles, and affiliations of submitted abstracts, but no full abstract texts. The conference printed booklet will contain full abstract texts from all participants. Conference certificates will be sent to the participants as a PDF document upon request at [email protected]. Only the name & affiliation will be stated in the certificate, not the email addresses of the participants.

Information is collected by an automated computer system that manages registrations. Security and confidentiality are guaranteed by state-of-the-art technical tools. However, Dravet Syndrome Foundation Spain declines any responsibility concerning data security transmitted through the internet.

Photography
The conference is held in public; therefore, we do not ban participants, exhibitors, partners and other companies from taking photographs of conference activities and participants, and share it via social media. By participating in the conference, you approve that general pictures will be taken and used for our Social Media output, our websites and other communication purposes. You hereby waive any right to oppose, and expressly authorise the organiser to make them available on the Internet or as it may seem fit. Author’s presentation slides shall not be photographed by any conference participant.

Disclaimer
The conference organiser cannot be held responsible for any loss, injury or damage to any property, whatever the cause may be. Should, for any reason outside the organiser’s control (e.g., political or economic circumstances or a case of ‘force majeure’), the venue or speakers change, or the event be cancelled, the organiser will endeavour to reschedule, but shall not be held responsible for any costs, damages or expenses incurred by the participants. If for any reason the organiser decides to make material changes to this conference, the organiser is not responsible for airfares, hotels or other costs incurred by the participants. The participant takes part in the conference, all tours, and trips at his own risk.

Copyright
The participant is allowed to use the conference documentation exclusively for his/her personal needs.

TERMS & CONDITIONS

The Dravet Syndrome Conference 2022 is organised by Dravet Syndrome Foundation Spain, whose registered office is located at Calle Doctor Fleming, 30, 28036 Madrid, Spain.

The conference shall take place at the Illustrious Official College of Physicians of Madrid, at Calle de Santa Isabel, 51, 28012 Madrid, Spain, on Thursday 31st of March 2022. Attendance to this conference is free of charge, but mandatory for organisational reasons. Participants must register online at www.dravetconference.com. Upon registration, each participant will receive an electronic confirmation by email. On-site registration will not be be possible. If a participant has not received the official email registration confirmation within 3 days, they must contact the conference secretariat at [email protected].

The conference registration includes: Attendance to all sessions, oral and visual presentations, all coffee and lunch breaks, and conference documentation with all information about the event. The registration does not include travel and accommodation costs or any other personal expenses.

Admittance to the conference without registration cannot be granted.

Conference Attendance
Upon arrival at the Illustrious Official College of Physicians of Madrid the day of the event, all participants have to register at the onsite Conference Registration Desk. The desk will open on 31st of March at 8:30 a.m. Upon registration onsite, the conference team will provide participants with information about the event and a badge, which should be worn visibly at all times. The personalised badge authorises participants to attend all conference sessions, and lunch and coffee breaks. 

Cancellation Policy
Dravet Syndrome Foundation Spain reserves the right to cancel any registration forthwith and without liability on its part in the event of any damage to, or destruction of the venue by fire, shortage of labour, strikes, industrial unrest, public health measures, or any other cause beyond the control of the Dravet Syndrome Foundation Spain, which shall prevent it from performing its obligations. In these circumstances, every effort will be made to find an alternative format/venue or propose a new date for the conference. Should the conference be cancelled for any reason, airfares, hotels, or other costs incurred by the participants are not reimbursed by the Dravet Syndrome Foundation Spain.

Any participant is allowed to cancel his/her registration but must notify this to the conference organisers by e-mail at [email protected] within a minimum of 10 days prior the event. Failure to attend the event without prior written notification by email may incur a no-show fee, which shall cover individual organizational, material and catering costs.

Name Change
All registrations are only valid for the respective person mentioned in the form. A registered participant unable to attend the conference may nominate (free of charge) a substitute participant by notifying the conference organisers by email at [email protected] before 24th of March 2022. The procedure allows giving the last name, first name, and email address of the new participant.

Personal Data
Upon registration, the participant authorises Dravet Syndrome Foundation Spain to use their personal data stated above to inform the participant of any further conferences, events, or information concerning the conference and Dravet Syndrome Foundation Spain’s activities. The conference booklet online will only contain authors, titles, and affiliations of submitted abstracts, but no full abstract texts. The conference printed booklet will contain full abstract texts from all participants. Conference certificates will be sent to the participants as a PDF document upon request at [email protected]. Only the name & affiliation will be stated in the certificate, not the email addresses of the participants.

Information is collected by an automated computer system that manages registrations. Security and confidentiality are guaranteed by state-of-the-art technical tools. However, Dravet Syndrome Foundation Spain declines any responsibility concerning data security transmitted through the internet.

Photography
The conference is held in public; therefore, we do not ban participants, exhibitors, partners and other companies from taking photographs of conference activities and participants, and share it via social media. By participating in the conference, you approve that general pictures will be taken and used for our Social Media output, our websites and other communication purposes. You hereby waive any right to oppose, and expressly authorise the organiser to make them available on the Internet or as it may seem fit. Author’s presentation slides shall not be photographed by any conference participant. 

Disclaimer
The conference organiser cannot be held responsible for any loss, injury or damage to any property, whatever the cause may be. Should, for any reason outside the organiser’s control (e.g., political or economic circumstances or a case of ‘force majeure’), the venue or speakers change, or the event be cancelled, the organiser will endeavour to reschedule, but shall not be held responsible for any costs, damages or expenses incurred by the participants. If for any reason the organiser decides to make material changes to this conference, the organiser is not responsible for airfares, hotels or other costs incurred by the participants. The participant takes part in the conference, all tours, and trips at his own risk.

Copyright
The participant is allowed to use the conference documentation exclusively for his/her personal needs.