Building and promoting Excellence in Life Sciences in Europe
Building and promoting Excellence in Life Sciences in Europe

Courses@CRG: Nextflow: Reproducible in silico Genomics

14 Sep 15 Sep 2017


Reproducibility of in-silico pipelines analysis has become one of biology’s most pressing issues. The exponential growth of biological datasets, increasingly complex data analysis methods and the lack of community standards all present major challenges. These obstacles are exacerbated when considering the installation, deployment and maintenance of bioinformatics pipelines across the diverse range of computational platforms and configurations on which these applications are expected to be applied (workstations, clusters, HPC, clouds, etc.).

Nextflow, a novel pipeline development tool by the CRG (Nature Biotechnology 35, 316–319 (2017) is emerging as an efficient solution to the reproducibility dilemma in omics analyses. By providing a domain specific language (DSL), Nextflow simplifies the writing of complex distributed computational workflows in a portable and replicable manner. It allows the seamless parallelization and deployment of any existing application with minimal development and maintenance overhead, irrespective of the original programming language. Reproduction and reuse and from any former configuration becomes easily apparent, guaranteeing consistent results over time and across different computing platforms.

The aim of this camp is to bring together Nextflow developers, workflow experts and bio-informaticians to discuss the current state of Nextflow technology, the latest developments and the open questions to tackle the problem of reproducible -omics analyses. Best practices will be introduced using practical examples on how to handle production of large-scale genomic applications for precision medicine.

A hands-on course and a hackathon, organized on the second day will give the attendees the ability to participate and practically contribute to the development of reference genomic analysis workflows along with Nextflow expert developers. Participants will learn how to write a workflow application with Nextflow, how to handle dependencies with containers (Docker and Singularity), to manage software versions with GitHub and how to deploy the computation across different platforms (HPC cluster, AWS cloud).


  • Paolo Di Tommaso, CRG, Barcelona, Spain
  • Cedric Notredame, CRG, Barcelona, Spain


  • Phil Ewels (SciLifeLab, Sweden)
  • Evan Floden (CRG, Spain)
  • Matthieu Foll (IARC, France)
  • Hugues Fontenelle (Oslo University Clinical Hospital, Norway)
  • Scott Hazelhurst (University of the Witwatersrand, South Africa)
  • Frederic Lemoine (Institut Pasteur, France)


  • Maria Chatzou (CRG, Spain)
  • Emilio Palumbo (CRG, Spain)
  • Pablo Prieto (CRG, Spain)


2 days: Starting on Thursday 14th of September 2017 at 10 am and finishing on Friday 15th of September 2017 at 4 pm.

Number of participants: 30

Registration fee:

200 Euros (academia)

400 euros (industry)

Registration fee includes participation in workshop, all the necessary tools to follow the course, didactic material, coffee breaks, lunches and welcome dinner. Two spots are reserved for CRG Alumni with 20% discount.


Registration ONLINE

Registration closes on 15th June 2017

Participants will be communicated by the end of June 2017 if they have been selected for the course.


CRG Training Unit

Dr. Aiguader 88

08003 Barcelona, Spain

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Dr. Aiguader 88
08003 Barcelona