What is the clinical evidence from this study?

Study design: Observational. Population: Sudden unexplained nocturnal death syndrome (SUNDS) (n=10). Intervention: SCN5A mutations. Primary outcome: Presence of SCN5A mutations.

What question did this study set out to answer?

This research aims to explore the genetic and functional similarities between SUNDS and Brugada syndrome.

February 1, 2002Human Molecular GeneticsOpen Access

Genetic and biophysical basis of sudden unexplained nocturnal death syndrome (SUNDS), a disease allelic to Brugada syndrome

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Key result

Genetic screening identified SCN5A mutations in 3 of 10 families with SUNDS, demonstrating that SUNDS and Brugada syndrome are phenotypically, genetically, and functionally the same disorder.

Population

10 families with sudden unexplained nocturnal death syndrome from southeast Asia, and Xenopus oocytes for…

Design

Preclinical

Authors

MVMatteo VattaHeart Failure / Cardiomyopathy

Discussion

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Implication

May guide SUNDS family screening; leaves open therapeutic implications and needs validation.

Key Points

This research aims to explore the genetic and functional similarities between SUNDS and Brugada syndrome.
Screened ten families with SUNDS for SCN5A mutations and associated ion channel genes
Utilized single-strand DNA conformation polymorphism analysis, denaturing high-performance liquid chromatography, and DNA sequencing
Expressed identified mutations in Xenopus oocytes to study their effects on sodium channel current.
Identified three SCN5A mutations in families: R367H (no current), A735V (shifted activation), and R1192Q (accelerated inactivation)
R367H mutation likely results in loss of function affecting sodium currents
Both A735V and R1192Q mutations reduced sodium channel current at key action potential phase.

Study Design

Type

Observational (n=10)

Structured PICO

Population

10 families with sudden unexplained nocturnal death syndrome (SUNDS) screened for mutations in SCN5A and long-QT syndrome-associated genes.

Exposure

Genetic screening for mutations in SCN5A and long-QT syndrome genes, and functional analysis of identified mutations

Outcome

Identification of SCN5A mutations and their functional effects on sodium channel currentssurrogate

SUNDS and Brugada syndrome share the same genetic basis (SCN5A mutations) and functional consequences, suggesting they are the same disorder.

Cite This Study

Matteo Vatta (2002) conducted an observational in Sudden unexplained nocturnal death syndrome (SUNDS) (n=10). SCN5A mutations was evaluated on Presence of SCN5A mutations. Genetic screening identified SCN5A mutations in 3 of 10 families with SUNDS, demonstrating that SUNDS and Brugada syndrome are phenotypically, genetically, and functionally the same disorder.

synapsesocial.com/papers/6a5ef596a182e0e07daf146c https://doi.org/10.1093/hmg/11.3.337

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Genetic and biophysical basis of sudden unexplained nocturnal death syndrome (SUNDS), a disease allelic to Brugada syndrome

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Cite This Study

Genetic and biophysical basis of sudden unexplained nocturnal death syndrome (SUNDS), a disease allelic to Brugada syndrome

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Cite This Study

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