Why the study?
Despite a genetic etiology, little is known about spinal muscular atrophy subtype concordance among siblings.
Population
303 sibships with SMA identified between 1996 and 2016
Design
Database cohort study
Authors
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High sibling concordance may inform SMA family counseling; leaves open mechanisms of discordance.
Most siblings with SMA share the same subtype (most commonly Type I), which is valuable for understanding familial occurrence and planning individual treatment.
Jones et al. (2019) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: