{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T04:00:15Z","timestamp":1790654415743,"version":"4.1.0"},"reference-count":73,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2021,6,14]],"date-time":"2021-06-14T00:00:00Z","timestamp":1623628800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Neurol."],"abstract":"<jats:p>A higher frequency of motor and breathing sleep-related disorders in multiple system atrophy (MSA) populations is reported. REM sleep behaviour disorder (RBD) is one of the most robust markers of an underlying alpha-synucleinopathy. Although a large corpus of literature documented the higher prevalence of RBD in MSA, few studies have systematically investigated the prevalence of RBD as mode of disease onset and its role in disease progression. Moreover, there has been increasing interest in phenoconversion into synucleinopathies of cohorts of patients with isolated RBD (iRBD). Finally, some studies investigated RBD as predictive factor of conversion in isolated autonomic failure, a synucleinopathy presenting with autonomic failure as the sole clinical manifestation that could convert to a manifest central nervous system synucleinopathy. As the field of neurodegenerative disorders moves increasingly towards developing disease-modifying therapies, detecting individuals in the prodromal stage of these synucleinopathies becomes crucial. The aims of this review are to summarise (1) the prevalence of RBD during the course of MSA and as presenting feature of MSA (iRBD), (2) the RBD features in MSA, (3) MSA progression and prognosis in the subgroup of patients with RBD predating disease onset, and (4) the prevalence of MSA conversion in iRBD cohorts. Moreover, we summarise previous results on the role of RBD in the context of isolated autonomic failure as marker of phenoconversion to other synucleinopathies and, in particular, to MSA.<\/jats:p>","DOI":"10.3389\/fneur.2021.677213","type":"journal-article","created":{"date-parts":[[2021,6,14]],"date-time":"2021-06-14T05:02:51Z","timestamp":1623646971000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":32,"title":["REM Sleep Behaviour Disorder in Multiple System Atrophy: From Prodromal to Progression of Disease"],"prefix":"10.3389","volume":"12","author":[{"given":"Giulia","family":"Giannini","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Federica","family":"Provini","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pietro","family":"Cortelli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giovanna","family":"Calandra-Buonaura","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2021,6,14]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"670","DOI":"10.1212\/01.wnl.0000324625.00404.15","article-title":"Second consensus statement on the diagnosis of multiple system atrophy","volume":"71","author":"Gilman","year":"2008","journal-title":"Neurology."},{"key":"B2","doi-asserted-by":"publisher","first-page":"89","DOI":"10.1002\/mdc3.12025","article-title":"Sleep disorders in atypical parkinsonism","volume":"1","author":"Abbott","year":"2014","journal-title":"Mov Disord Clin Pract."},{"key":"B3","doi-asserted-by":"publisher","first-page":"361","DOI":"10.1016\/S1474-4422(12)70022-4","article-title":"Premotor signs and symptoms of multiple system atrophy","volume":"11","author":"Jecmenica-Lukic","year":"2012","journal-title":"Lancet Neurol."},{"key":"B4","doi-asserted-by":"publisher","first-page":"630","DOI":"10.1212\/WNL.0000000000008208","article-title":"Stridor in multiple system atrophy: consensus statement on diagnosis, prognosis, and treatment","volume":"93","author":"Cortelli","year":"2019","journal-title":"Neurology."},{"key":"B5","doi-asserted-by":"publisher","first-page":"223e30","DOI":"10.1001\/archneurol.2010.359","article-title":"Excessive daytime sleepiness in multiple system atrophy (SLEEMSA study)","volume":"68","author":"Moreno-L\u00f3pez","year":"2011","journal-title":"Arch Neurol."},{"key":"B6","doi-asserted-by":"publisher","first-page":"1177","DOI":"10.1002\/mds.1207","article-title":"Irresistible onset of sleep during acute levodopa challenge in a patient with multiple system atrophy (MSA): placebo-controlled, polysomnographic case report","volume":"16","author":"H\u00f6gl","year":"2001","journal-title":"Mov Disord."},{"key":"B7","doi-asserted-by":"publisher","first-page":"798","DOI":"10.1136\/jnnp.72.6.798","article-title":"Sleep disorders and their determinants in multiple system atrophy","volume":"72","author":"Ghorayeb","year":"2002","journal-title":"J Neurol Neurosurg Psychiatry."},{"key":"B8","doi-asserted-by":"publisher","first-page":"1822","DOI":"10.1002\/mds.21668","article-title":"Cerebrospinal fluid hypocretin-1 levels in multiple system atrophy","volume":"22","author":"Martinez-Rodriguez","year":"2007","journal-title":"Mov Disord"},{"key":"B9","doi-asserted-by":"publisher","first-page":"1281","DOI":"10.1002\/mds.20898","article-title":"Levodopa-induced sleepiness in the Parkinson variant of multiple system atrophy","volume":"21","author":"Seppi","year":"2006","journal-title":"Mov Disord."},{"key":"B10","volume-title":"International Classification of Sleep Disorders - 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