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A willow sex chromosome reveals convergent evolution of complex palindromic repeats

Journal Article · · Genome Biology (Online)
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [7];  [7];  [7];  [8];  [9];  [10];  [11];  [3];  [2]
  1. West Virginia Univ., Morgantown, WV (United States); DOE/OSTI
  2. West Virginia Univ., Morgantown, WV (United States)
  3. Cornell Univ., Geneva, NY (United States). New York State Agricultural Experiment Station
  4. HudsonAlpha Inst. of Biotechnology, Huntsville, AL (United States); USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  5. HudsonAlpha Inst. of Biotechnology, Huntsville, AL (United States)
  6. Univ. of Arizona, Tucson, AZ (United States)
  7. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  9. Sichuan Univ., Chengdu (China)
  10. Sichuan Univ., Chengdu (China); Lanzhou Univ. (China)
  11. Texas Tech Univ., Lubbock, TX (United States)
Background: Sex chromosomes have arisen independently in a wide variety of species, yet they share common characteristics, including the presence of suppressed recombination surrounding sex determination loci. Mammalian sex chromosomes contain multiple palindromic repeats across the non-recombining region that show sequence conservation through gene conversion and contain genes that are crucial for sexual reproduction. In plants, it is not clear if palindromic repeats play a role in maintaining sequence conservation in the absence of homologous recombination. Results: Here we present the first evidence of large palindromic structures in a plant sex chromosome, based on a highly contiguous assembly of the W chromosome of the dioecious shrub Salix purpurea. The W chromosome has an expanded number of genes due to transpositions from autosomes. It also contains two consecutive palindromes that span a region of 200 kb, with conspicuous 20-kb stretches of highly conserved sequences among the four arms that show evidence of gene conversion. Four genes in the palindrome are homologous to genes in the sex determination regions of the closely related genus Populus, which is located on a different chromosome. These genes show distinct, floral-biased expression patterns compared to paralogous copies on autosomes. Conclusion: The presence of palindromes in sex chromosomes of mammals and plants highlights the intrinsic importance of these features in adaptive evolution in the absence of recombination. Convergent evolution is driving both the independent establishment of sex chromosomes as well as their fine-scale sequence structure.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC); National Key Research and Development Program of China; National Key Project for Basic Research
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1626951
Alternate ID(s):
OSTI ID: 1648998
Journal Information:
Genome Biology (Online), Journal Name: Genome Biology (Online) Journal Issue: 1 Vol. 21; ISSN 1474-760X
Publisher:
BioMed CentralCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Longest Palindromic Substring in Sublinear Time text January 2022
Additional file 2 of Repeated turnovers keep sex chromosomes young in willows dataset January 2022
Additional file 3 of Repeated turnovers keep sex chromosomes young in willows dataset January 2022
Genome assembly of the basket willow, Salix viminalis, reveals earliest stages of sex chromosome expansion journal June 2020
Genome assembly of the basket willow, Salix viminalis, reveals earliest stages of sex chromosome expansion text January 2020


Figures / Tables (11)


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