Martin Johnsson

PhD in genetics

Docent (associate professor) in Animal Science with specialisation Quantitative Genetics and Genomics at The Department of Animal Biosciences, Swedish University of Agricultural Sciences.

Email address: first name full stop last name at slu full stop se

Mastodon account: @martinj@mastodon.social

ORCID ID: 0000-0003-1262-4585

Curriculum vitae

Publications

Full publication list

Most of the papers are open access, but if there is something you can't find, send me an email.

For citation counts and (probably erroneous) metadata, see the Google Scholar and Web of Science profiles.

Blog

I keep a blog called On unicorns and genes about genetics and related things.

Interests

Here are some of the topics in genetics that interest me, with some related papers that I've been involved in:

Population genomics. With plentiful whole-genome sequence, one can describe the genetic variation of populations in ever finer detail. I am interested in genetic variation, signatures of selection and recombination rate variation in domestic and feral animals.

Related papers:

• Ros-Freixedes et al. 2022 Rare and population-specific functional variation across pig lines
• Johnsson, Whalen et al. 2021 Genetic variation in recombination rate in the pig
• Johnsson et al. 2016 Feralisation targets different genomic loci to domestication in the chicken

Genetic mapping of complex traits. I am interested in the genetic basis of complex traits that matter to farm animals, such as body size and bone quality. Mapping the genetic basis of molecular traits such as transcript levels ("eQTL mapping") can help with identifying causative genes for quantitative traits, and also give us large sets of genetic associations to analyse.

Related papers:

• Sallam et al. 2023 Genetic markers associated with bone composition in Rhode Island Red laying hens
• Johnsson et al. 2023 Genetics of tibia bone properties of crossbred commercial laying hens in different housing systems
• Johnsson et al. 2018 Genetical genomics of growth in a chicken model

Deleterious variation. Deleterious variants are the most tractable functional variants, and can be detected either by genotype-first or sequence-first methods. They raise all kinds of interesting management questions for breeding programs.

Related papers:

• Ablondi, Johnsson et al. 2022 Performance of Swedish Warmblood fragile foal syndrome carriers and breeding prospects
• Johnsson et al. 2019 Removal of alleles by genome editing (RAGE) against deleterious load
• Jenko et al. 2019 Analysis of a large dataset reveals haplotypes carrying putatively recessive lethal and semi-lethal alleles with pleiotropic effects on economically important traits in beef cattle

Domestication. Domestic animals differ from their wild relatives in many ways, including behavioural differences towards humans and other complex traits. I have been involved in genetic mapping of complex traits in chicken domestication.

Related papers:

• Johnsson et al. 2021 The neural crest cell hypothesis: no unified explanation for domestication
• Fallahsharoudi et al. 2017 QTL mapping of stress related gene expression in a cross between domesticated chickens and ancestral red junglefowl
• Henriksen et al. 2016 The domesticated brain: genetics of brain mass and brain structure in an avian species

Dissertation

I defended my PhD, Genomics of chicken domestication and feralisation, from Linköping University, on the 18th of December 2015. The cover art was made by Alexander Hultberg.