What is the clinical evidence from this study?

Study design: Observational. Population: Autosomal recessive limb girdle muscular dystrophies. Intervention: Sarcospan gene mutations. Primary outcome: Primary mutations in the sarcospan gene.

What question did this study set out to answer?

To investigate the molecular assembly and localization requirements of sarcospan within the sarcoglycan complex and evaluate whether primary mutations in sarcospan cause muscular dystrophy.

August 12, 2000Human Molecular GeneticsOpen Access

Molecular and genetic characterization of sarcospan: insights into sarcoglycan-sarcospan interactions

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Key result

Screening of >50 autosomal recessive muscular dystrophy cases identified no primary mutations in the sarcospan gene, indicating its loss is secondary to sarcoglycan mutations.

Population

>50 cases of autosomal recessive muscular dystrophy, including a patient with limb girdle muscular dystrophy…

Design

Case_series

Authors

RCRachelle H. CrosbieUniversity of California, Los Angeles

Discussion

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Implication

Absence of primary sarcospan mutations cautions against routine screening; leaves open the functional necessity of intact gamma-sarcoglycan C-terminus for complex stability.

Key Points

To investigate the molecular assembly and localization requirements of sarcospan within the sarcoglycan complex and evaluate whether primary mutations in sarcospan cause muscular dystrophy.
Evaluated sarcospan protein expression in muscle tissue samples from patients with primary sarcoglycan mutations and sarcoglycanopathies.
Screened genomic DNA from >50 patients with autosomal recessive muscular dystrophy for mutations within the sarcospan gene.
Sarcospan was absent in patients with complete or partial sarcoglycan loss, including a patient lacking only gamma-sarcoglycan, demonstrating that tetrameric sarcoglycan assembly is required for sarcospan localization.
Screening of >50 autosomal recessive muscular dystrophy cases identified three intragenic polymorphisms but no primary disease-causing sarcospan mutations.
Identified a patient with limb girdle muscular dystrophy and cardiomyopathy exhibiting a C-terminal gamma-sarcoglycan truncation that preserved complex assembly with sarcospan, demonstrating that membrane localization alone does not prevent disease.

Study Design

Type

Observational

Structured PICO

Population

Screening of >50 patients with autosomal recessive muscular dystrophy to identify primary mutations in the sarcospan gene.

Exposure

Genetic screening for mutations in the sarcospan gene and protein expression analysis

Outcome

Presence of primary mutations in the sarcospan gene and expression of sarcospan/sarcoglycan complexsurrogate

Membrane expression of a mutant sarcoglycan-sarcospan complex is insufficient to prevent muscular dystrophy and cardiomyopathy, highlighting the critical role of the gamma-sarcoglycan C-terminus.

Cite This Study

Rachelle H. Crosbie (2000) conducted an observational in Autosomal recessive limb girdle muscular dystrophies. Sarcospan gene mutations was evaluated on Primary mutations in the sarcospan gene. Screening of >50 autosomal recessive muscular dystrophy cases identified no primary mutations in the sarcospan gene, indicating its loss is secondary to sarcoglycan mutations.

synapsesocial.com/papers/6a8317df95f6f1aefa9c8ef8 https://doi.org/10.1093/hmg/9.13.2019

Topics

Cardiomyopathy

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Implication

Absence of primary sarcospan mutations cautions against routine screening; leaves open the functional necessity of intact gamma-sarcoglycan C-terminus for complex stability.

Molecular and genetic characterization of sarcospan: insights into sarcoglycan-sarcospan interactions

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Cite This Study

Topics

Molecular and genetic characterization of sarcospan: insights into sarcoglycan-sarcospan interactions

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Cite This Study

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