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Synucleinopathies are a group of disorders characterized by the accumulation of inclusions rich in the a‐synuclein (aSyn) protein. This group of disorders includes Parkinson's disease, dementia with Lewy bodies (DLB), multiple systems atrophy, and pure autonomic failure (PAF). In addition, genetic alterations (point mutations and multiplications) in the gene encoding for aSyn (SNCA) are associated with familial forms of Parkinson's disease, the most common synucleinopathy. The Synuclein Meetings are a series that has been taking place every 2 years for about 12 years. The Synuclein Meetings bring together leading experts in the field of Synuclein and related human conditions with the goal of discussing and advancing the research. In 2019, the Synuclein meeting took place in Ofir, a city in the outskirts of Porto, Portugal. The meeting, entitled "Synuclein Meeting 2019: Where we are and where we need to go", brought together >300 scientists studying both clinical and molecular aspects of synucleinopathies. The meeting covered a many of the open questions in the field, in a format that prompted open discussions between the participants, and underscored the need for additional research that, hopefully, will lead to future therapies for a group of as of yet incurable disorders. Here, we provide a summary of the topics discussed in each session and highlight what we know, what we do not know, and what progress needs to be made in order to enable the field to continue to advance. We are confident this systematic assessment of where we stand will be useful to steer the field and contribute to filling knowledge gaps that may form the foundations for future therapeutic strategies, which is where we need to go. [ABSTRACT FROM AUTHOR]

The Synuclein Meetings are a series that has been taking place every 2 years for about 12 years. The Synuclein Meetings bring together leading experts in the field of synuclein and related human conditions with the goal of discussing and advancing the research. In 2019, the Synuclein Meeting is taking place in Ofir, a city in the outskirts of Porto, Portugal. The meeting is entitled 'Synuclein Meeting 2019: Where we are and where we need to go'. It has now been 22 years since the initial report of the genetic and pathological association between alpha‐synuclein and Parkinson's disease (PD). The field has grown and matured, and major advances have been made. We are witnessing exciting times, with the first clinical trials being conducted that target synuclein, and bring the hope of novel therapies for patients with PD and their families. However, we still face many challenges and need to address fundamental questions for the field to progress to where we need to go: having biomarkers and effective therapies for PD and other synucleinopathies. In this context, we have designed the Synuclein Meeting 2019 with a different format. The program will include sessions in the format of a round‐table discussion, to break away from the more rigid format of regular scientific meetings based on oral presentations. Our goal was to create opportunities for discussing the major questions in the field of synuclein and related human disorders, and challenge dogmatic ideas that require a critical revision in light of the most recent knowledge. In this issue, we assembled a series of comprehensive overviews of major topics, questions, and challenges in the field, that will be discussed in the meeting. We are confident that this special issue will be an instrumental reference for inspiring novel paths for future discoveries in the synuclein field and generate other discussions in the scientific community. This is the Preface for the Special Issue "Synuclein". Cover Image for this issue: doi: 10.1111/jnc.14520. [ABSTRACT FROM AUTHOR]