HOME >> BIOLOGY >> NEWS
Sunflower speciation highlights roles for transposable elements in evolution

In a finding that furthers our understanding of how hybridization may contribute to genome changes and the evolution of new species, researchers have found that the genomes of three sunflower species that arose in evolution as hybrids of the same two parental types have undergone a massive proliferation of genetic entities known as transposable elements. The findings are reported by Mark Ungerer and colleagues at Kansas State University and appear in the October 24th issue of the journal Current Biology, published by Cell Press.

Theory predicts that for diploid species--that is, those possessing two sets of chromosomes, like most animals and plants--the origin of new species through inter-species hybridization may be facilitated by rapid reorganization of genomes. Previous work on three independently derived hybrid sunflower species has validated this mode of speciation by documenting novel structural rearrangements in their chromosomes, as well as large-scale increases in nuclear DNA content. The nuclear-genome size differences between the hybrids and their parental taxa occur in spite of the fact that all species possess the same number of chromosomes and are diploids.

In the new work, the researchers have determined that the genome size differences between the hybrid and parental sunflower species are associated with a massive proliferation of transposable genetic elements that has occurred independently in the genome of each hybrid species. Transposable elements, made famous by Barbara McClintock in her study of their behavior in maize, are related to infectious retroviruses and are capable of multiplying and inserting themselves at different points throughout a host genome. They are found in virtually all eukaryotic genomes.

The new findings not only add an interesting twist to the origin of new sunflower species through hybridization, but also suggest that the sunflower system may emerge as an excellent model group for study
'"/>

Contact: Heidi Hardman
hhardman@cell.com
617-397-2879
Cell Press
23-Oct-2006


Page: 1 2

Related biology news :

1. Can a taste for poison drive speciation?
2. Nevada scientist part of team that discovers hybrid speciation in butterflies in Sierra
3. Butterfly speciation event recreated
4. Experimental evolution of yeast in the lab may illuminate early events in speciation
5. Other highlights in the Aug. 7 JNCI
6. Other highlights in the July 24 JNCI
7. Other highlights from the July 10 JNCI
8. Other highlights in JNCI, June 26
9. Other highlights in JNCI, June 12
10. Other highlights from the June 6 JNCI
11. Other highlights in the May 16 JNCI

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:8/26/2020)... ... ... Modality Solutions, a biopharmaceutical cold chain validation engineering firm, is ... is the most prestigious ranking of the nation’s fastest-growing private companies. Modality Solutions made ... three-year revenue growth of 71 percent. , The Inc. 5000 list represents a ...
(Date:8/21/2020)... ... 18, 2020 , ... Sentien Biotechnologies, Inc., a clinical-stage biotechnology ... and Drug Administration (FDA) has approved the company’s Investigational New Drug (IND) application ... COVID-19. Approval of this IND allows Sentien to initiate a Phase 1/2 study ...
(Date:8/21/2020)... ... August 19, 2020 , ... ... expo uniting life science, data science, informatics and IT leaders goes VIRTUAL and ... period of uncertainty and change, Bio-IT takes the leadership role of keeping our ...
Breaking Biology News(10 mins):
(Date:7/31/2020)... ... 29, 2020 , ... Anomet Products has introduced new custom ... use with CRM, neurostimulation, vascular, and related devices. , Anomet Medical Clad ... performance, and cost criteria; especially where solid wire is limited. Typical configurations for ...
(Date:7/31/2020)... ... July 29, 2020 , ... eSource has long been ... webinar will cover the history of eSource, the reasons it did not take off ... wearables, to site source, the industry is moving towards capturing data electronically for clinical ...
(Date:7/31/2020)... SAN FRANCISCO (PRWEB) , ... ... ... fast-growing provider of cloud-based software for the life sciences industry, today announced ... and presentation platform designed specifically for Medical Science Liaisons (MSLs) and other ...
(Date:7/18/2020)... ... , ... After research model surgery and catheter implantation, the long journey of ... beginning of a successful study, while protecting and accessing the catheter or device post-surgery ... Surgery from Envigo in a live webinar on Wednesday, August ...
Breaking Biology Technology:
Cached News: