ELLA is a tool for clinical interpretation of genetic variants.

The users will either interpret a single variant or several variants belonging together in an analysis.

The result of the interpretation work are assessments that include the classification of the variant (1-5, T). The assessments are the product of ELLA. When the same variant(s) is seen in other samples the previous interpretation work can be reused, saving valuable time.

The interpretation work must be approved by another person in multi-step workflow.

In general ELLA has an append-only data model, where no data is deleted or overwritten. Instead an updated copy is made and the versions are linked.

High-level system diagram of ELLA:

ELLA is built as a web application, divided between a frontend and a backend. The frontend runs fully in the user's browser, while the backend runs on a server. The frontend communicates with the backend via a JSON based REST API.


The frontend is written in javascript, using:


The backend written in Python, built using Flask.


ELLA uses a relational database PostgreSQL with the data model defined using SQLAlchemy

Command line interface

ELLA has command line tool (using Click) to import gene panels, users and variants.

Last Updated: 9/3/2019, 9:35:19 AM