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The slowdown of Y chromosome expansion in dioecious Silene latifolia due to DNA loss and male-specific silencing of retrotransposons

J. Puterova, Z. Kubat, E. Kejnovsky, W. Jesionek, J. Cizkova, B. Vyskot, R. Hobza,

. 2018 ; 19 (1) : 153. [pub] 20180220

Jazyk angličtina Země Anglie, Velká Británie

Typ dokumentu časopisecké články, práce podpořená grantem

Perzistentní odkaz   https://www.medvik.cz/link/bmc18033301

BACKGROUND: The rise and fall of the Y chromosome was demonstrated in animals but plants often possess the large evolutionarily young Y chromosome that is thought has expanded recently. Break-even points dividing expansion and shrinkage phase of plant Y chromosome evolution are still to be determined. To assess the size dynamics of the Y chromosome, we studied intraspecific genome size variation and genome composition of male and female individuals in a dioecious plant Silene latifolia, a well-established model for sex-chromosomes evolution. RESULTS: Our genome size data are the first to demonstrate that regardless of intraspecific genome size variation, Y chromosome has retained its size in S. latifolia. Bioinformatics study of genome composition showed that constancy of Y chromosome size was caused by Y chromosome DNA loss and the female-specific proliferation of recently active dominant retrotransposons. We show that several families of retrotransposons have contributed to genome size variation but not to Y chromosome size change. CONCLUSIONS: Our results suggest that the large Y chromosome of S. latifolia has slowed down or stopped its expansion. Female-specific proliferation of retrotransposons, enlarging the genome with exception of the Y chromosome, was probably caused by silencing of highly active retrotransposons in males and represents an adaptive mechanism to suppress degenerative processes in the haploid stage. Sex specific silencing of transposons might be widespread in plants but hidden in traditional hermaphroditic model plants.

Citace poskytuje Crossref.org

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$a Puterova, Janka $u Department of Plant Developmental Genetics, Institute of Biophysics, Czech Academy of Sciences, Kralovopolska 135, 612 00, Brno, Czech Republic. Department of Information Systems, Faculty of Information Technology, Brno University of Technology, 61200, Brno, Czech Republic.
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$a Kubat, Zdenek $u Department of Plant Developmental Genetics, Institute of Biophysics, Czech Academy of Sciences, Kralovopolska 135, 612 00, Brno, Czech Republic. kubat@ibp.cz.
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$a Kejnovsky, Eduard $u Department of Plant Developmental Genetics, Institute of Biophysics, Czech Academy of Sciences, Kralovopolska 135, 612 00, Brno, Czech Republic.
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$a Jesionek, Wojciech $u Department of Plant Developmental Genetics, Institute of Biophysics, Czech Academy of Sciences, Kralovopolska 135, 612 00, Brno, Czech Republic.
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$a Cizkova, Jana $u Centre of Plant Structural and Functional Genomics, Institute of Experimental Botany, Czech Academy of Sciences, 783 71, Olomouc - Holice, Czech Republic.
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$a Vyskot, Boris $u Department of Plant Developmental Genetics, Institute of Biophysics, Czech Academy of Sciences, Kralovopolska 135, 612 00, Brno, Czech Republic.
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$a Hobza, Roman $u Department of Plant Developmental Genetics, Institute of Biophysics, Czech Academy of Sciences, Kralovopolska 135, 612 00, Brno, Czech Republic. hobza@ibp.cz. Centre of Plant Structural and Functional Genomics, Institute of Experimental Botany, Czech Academy of Sciences, 783 71, Olomouc - Holice, Czech Republic. hobza@ibp.cz.
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