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EDITORIAL article

Front. Bioinform., 30 November 2022
Sec. Genomic Analysis
This article is part of the Research Topic Towards genome interpretation: computational methods to model the genotype-phenotype relationship View all 5 articles

Editorial: Towards genome interpretation: Computational methods to model the genotype-phenotype relationship

Daniele Raimondi&#x;Daniele Raimondi1Gabriele Orlando&#x;Gabriele Orlando2Nora VerplaetseNora Verplaetse1Piero FariselliPiero Fariselli3Yves Moreau
Yves Moreau1*
  • 1ESAT-STADIUS, KU Leuven Leuven, Belgium
  • 2Switch Laboratory, KU Leuven Leuven, Belgium
  • 3Department of Medical Sciences, University of Torino, Torino, Italy

Genome Interpretation (GI) is an umbrella term for the scientific efforts oriented towards modelling and understanding the relationship between genotype and phenotype in living organisms (Daneshjou et al., 2017; Andreoletti et al., 2019; Raimondi et al., 2022a). Even temporarily setting epigenetic and environmental effects aside, untangling the complex relation between the complete set of genetic material of an individual organism (be it a human, other animals, plants, or microorganisms) and its observed phenotypes is an extremely ambitious and challenging endeavor, in particular for non-Mendelian traits. Being able to reliably model this genotype-phenotype relationship could revolutionize many aspects of genetics, biology, and medicine (Daneshjou et al., 2017; Fröhlich et al., 2018). For example, it could warn us about late-onset genetic disorders, helping their prevention (Weedon et al., 2006; Morrison et al., 2007). It could also lead to the design of medications and treatments tailored to each patient’s genome, complementing environmental and medical-history data to improve patient prognosis (Fröhlich et al., 2018). Applied to cancer, it could bring a novel understanding of cancer development, helping devise highly specific cocktails of drugs and discover novel molecules to target each unique tumor (Li et al., 2019). Such personalized approaches to medicine, called Precision Medicine, are still largely out of our reach in many clinical settings (Daneshjou et al., 2017; Fröhlich et al., 2018).

In the last decade, the avalanche of scientific results brought by Next Generation Sequencing (NGS) and big data technologies seemed almost unstoppable, and at times it seemed that finally cracking the genotype-phenotype problem was within reach. Ten years later, notwithstanding the vast amounts of data collected and numerous advances in genetics (Moreau and Tranchevent, 2012; Boycott et al., 2013; Erwin et al., 2014; Goodwin et al., 2016), including the discovery of the causative variants for many Mendelian disorders (Bamshad et al., 2011), our genome is still hiding most of its secrets. When it comes to oligogenic and polygenic diseases (i.e., diseases involving respectively few and many genes (Gazzo et al., 2017)), the bottleneck has indeed mostly just shifted from a problem of data availability to one of data interpretation, since the classical approaches used in genetics have shown important shortcomings in uncovering complex disease mechanisms (Manolio et al., 2009; Gibson, 2012; Francisco and Bustamante, 2018; Wald and Robert, 2019).

The advent of NGS technologies was nonetheless invaluable, since they almost brought us at the doorstep of a new era where the scarcity of genomics data will be less and less of a bottleneck. This will make the application of data hungry cutting-edge Machine Learning (ML) and Deep Learning (DL) methods to this endeavor finally possible, eventually reproducing the astounding successes that methods such AlphaFold (Jumper et al., 2021; Chowdhury et al., 2022) obtained in structural biology in the realm of Genome Interpretation.

However, data abundance alone will not do the trick, for such a complex problem. The actual implementation of ML/DL methods for GI requires the development of tailor-made algorithms that can deal with the unique issues presented by genomic and phenomics (Houle et al, 2010) data. For example, Whole Exome or Genome Sequencing samples (WES, WGS) can be extremely large, sparse, and noisy (Ng et al., 2008). Moreover, they also pose privacy and ethical issues in their management, storage, and processing (Rieke et al., 2020). Finally, to apply GI to Precision Medicine, models must ensure accountability of their predictions, for example by providing means for their interpretability and explainability, following the Explainable AI (XAI) paradigm (Bach et al., 2015; Smilkov et al., 2017; Lapuschkin et al., 2019; Raimondi et al., 2020a).

In the last decade, the bioinformatics community has addressed various specific aspects related to the Genome Interpretation (GI) problem, developing variant-effect predictors (Kircher et al., 2014; Dong et al., 2015; Ioannidis et al., 2016; Jagadeesh et al., 2016; Niroula and Vihinen, 2016; Raimondi et al., 2016; Raimondi et al., 2017), variant-prioritization (Sifrim et al., 2013; Wu et al., 2014; Cipriani et al., 2020) and gene-prioritization tools (Aerts et al., 2006; Guala and Sonnhammer, 2017), also trying to model digenic disease (Gazzo et al., 2017; Papadimitriou et al., 2019) or the protein-level molecular phenotype caused by a variant (Dehouck et al., 2011; Pucci et al., 2020; Raimondi et al., 2022b). Other widespread approaches in this sense include Genome Wide Association Studies (GWAS) (Uffelmann et al., 2021) and Polygenic Risk Scores (PRS) (Wei et al., 2013; Ali et al., 2018; Ala-Korpela and Holmes, 2020; Badré et al., 2021). In the context of plant and animal sciences, genetic marker-based methods for the Genomic Prediction for plants and animal breeding (e.g., BLUP) have been widely used (Daetwyler et al., 2013; Hickey et al., 2017; Wray et al., 2019; Maldonado et al., 2020).

These methods are the most relevant examples of how GI has been tackled so far. Few of them aim at directly modeling the genotype-phenotype relationship, while most focus instead on simpler subproblems, such as predicting the neutral/deleterious effect of variants or just finding associations between phenotypes and genomic regions.

The growing availability of genomics data will soon enable the application of the latest ML/DL algorithms to GI, attempting to directly model the phenotypes produced by a given genome or exome, following a “genomes in/phenotypes out” paradigm (Raimondi et al., 2020b; Raimondi et al., 2022a). Early examples of such an approach, although on limited data, are methods for the case-controls discrimination of Crohn’s Disease (Wang et al., 2019; Raimondi et al., 2020b), Bipolar Disorder (Laksshman et al., 2017), the multi-phenotypic prediction of A. thaliana (Raimondi et al., 2022a) and yeast quantitative traits (Grinberg et al., 2020). We can imagine these methods as framed within a spectrum of complexity: at the narrow end of the spectrum we have methods aiming at the binary prediction or regression of the presence/absence of a certain phenotype (e.g., in cases/control studies) (Pal et al., 2017; Raimondi et al., 2020b), while at the broad end of the spectrum we have methods that perform a multiphenotypic prediction given a certain type of genotype measurement (e.g., WES, WGS or SNP array data) (Grinberg et al., 2020; Raimondi et al., 2022a).

In this Research Topic we collect papers that develop computational and ML methods addressing the challenges posed by this new paradigm of ML-based GI. These studies range from the application of GI to prokaryotes, with methods for the identification of putative cellulolytic anaerobes and for the identification of microsatellites that could act as biomarkers to differentiate C. pseudotuberculosis genomes, to yeast, with a Sparse Bayesian method for the prediction of S. cerevisiae growth in 46 different environmental conditions. Finally, regarding the development of strategies to apply DL methods to GI in the future, we propose a study investigating the possibility of encoding human genotype data as images, thus making it suitable for the application of DL techniques such as Convolutional Neural Networks for case/control classification.

While this Research Topic is by no means conclusive for a complex and long-term problem such as GI, we hope it can help focus more debate and research efforts on this flavor of ML/DL based GI, paving the way for full-fledged applications of this paradigm once large-scale genomic and phenomic data become widely available.

Author contributions

All authors listed have made a substantial, direct, and intellectual contribution to the work and approved it for publication.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Citation: Raimondi D, Orlando G, Verplaetse N, Fariselli P and Moreau Y (2022) Editorial: Towards genome interpretation: Computational methods to model the genotype-phenotype relationship. Front. Bioinform. 2:1098941. doi: 10.3389/fbinf.2022.1098941

Received: 15 November 2022; Accepted: 17 November 2022;
Published: 30 November 2022.

Edited and reviewed by:

Joao Carlos Setubal, University of São Paulo, Brazil

Copyright © 2022 Raimondi, Orlando, Verplaetse, Fariselli and Moreau. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Yves Moreau, yves.moreau@kuleuven.be

These authors have contributed equally to this work

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.