Gene Copy Number Variation Does Not Reflect Structure or Environmental Selection in Two Recently Diverged California Populations of Suillus brevipes. Issue 12 (1st December 2020)

• Record Type: Journal Article
• Authors: Bazzicalupo, Anna L; Thomas, Mallory; Mason, Robert; Munro-Ehrlich, ; Branco, Sara
• Is Part Of: G3. Volume 10:Issue 12(2020)
• Page Start: 4591
• Page End: 4597
• Publication Date: 2020-12-01
• Subjects: fungi -- copy-number variants -- Suillus -- salt tolerance -- mycorrhiza; Genetics -- Research -- Periodicals; Genomics -- Periodicals; Genetics; Genomics; Genes; Genetics -- Research; Genomics; Electronic journals; Periodical; Periodicals; Fulltext; Internet Resources; Periodicals; 572.8
• DOI: 10.1534/g3.120.401735
• Languages: English
• ISSNs: 2160-1836

Abstract

Abstract: Gene copy number variation across individuals has been shown to track population structure and be a source of adaptive genetic variation with significant fitness impacts. In this study, we report opposite results for both predictions based on the analysis of gene copy number variants (CNVs) of Suillus brevipes, a mycorrhizal fungus adapted to coastal and montane habitats in California. In order to assess whether gene copy number variation mirrored population structure and selection in this species, we investigated two previously studied locally adapted populations showing a highly differentiated genomic region encompassing a gene predicted to confer salt tolerance. In addition, we examined whether copy number in the genes related to salt homeostasis was differentiated between the two populations. Although we found many instances of CNV regions across the genomes of S. brevipes individuals, we also found CNVs did not recover population structure and known salt-tolerance-related genes were not under selection across the coastal population. Our results contrast with predictions of CNVs matching single-nucleotide polymorphism divergence and showed CNVs of genes for salt homeostasis are not under selection in S. brevipes .