scholarly journals Timing and Scope of Genomic Expansion within Annelida: Evidence from Homeoboxes in the Genome of the EarthwormEisenia fetida

2015 ◽  
Vol 8 (1) ◽  
pp. 271-281 ◽  
Author(s):  
Allison S. Zwarycz ◽  
Carlos W. Nossa ◽  
Nicholas H. Putnam ◽  
Joseph F. Ryan
Keyword(s):  
Genomic Expansion

Evolution of the cell cycle

1995 ◽  
Vol 349 (1329) ◽  
pp. 271-281 ◽  
Keyword(s):  
Mitotic Spindle ◽  
Eukaryotic Cell ◽  
Cyclin Dependent Kinase ◽  
Primitive Cell ◽  
Daughter Cells ◽  
Single Origin ◽  
Multiple Origins ◽  
Sister Chromatids ◽  
Functional Components ◽  
Genomic Expansion

Cell proliferation involves duplication of all cell constituents and their more-or-less equal segregation to daughter cells. It seems probable that the performance of primitive cell-like structures would have been dogged by poor duplication and segregation fidelity, and by parasitism. This favoured evolution of the genome and with it the distinction between ‘genomic.’ components like chromosomes whose synthesis is periodic and most other ‘functional’ components whose synthesis is continuous. Eukaryotic cells evolved from bacterial ancestors whose fused genome was replicated from a single origin and whose means of segregating sister chromatids depended on fixing their identity at replication. Evolution of an endo- or cytoskeleton, initially as means of consuming other bacteria, eventually enabled evolution of the mitotic spindle and a new means of segregating sister chromatids whose replication could be initiated from multiple origins. In this primitive eukaryotic cell, S and M phases might have been triggered by activation of a single cyclin-dependent kinase whose destruction along with that of other proteins would have triggered anaphase. Mitotic non-disjunction would have greatly facilitated genomic expansion, now possible due to multiple origins, and thereby accelerated the tempo of evolution when permitted by environmental conditions.

scholarly journals Genomic expansion of Aldh1a1 protects beavers against high metabolic aldehydes from lipid oxidation

Cell Reports ◽  
2021 ◽  
Vol 37 (6) ◽  
pp. 109965
Author(s):  
Quanwei Zhang ◽  
Gregory Tombline ◽  
Julia Ablaeva ◽  
Lei Zhang ◽  
Xuming Zhou ◽  
...  
Keyword(s):  
Lipid Oxidation ◽  
Genomic Expansion

scholarly journals Massive and Widespread Organelle Genomic Expansion in the Green Algal Genus Dunaliella

2015 ◽  
Vol 7 (3) ◽  
pp. 656-663 ◽  
Author(s):  
Michael Del Vasto ◽  
Francisco Figueroa-Martinez ◽  
Jonathan Featherston ◽  
Mariela A. González ◽  
Adrian Reyes-Prieto ◽  
...  
Keyword(s):  
Green Algal ◽  
Algal Genus ◽  
Genomic Expansion

Genomic expansion of the Bov-A2 retroposon relating to phylogeny and breed management

2007 ◽  
Vol 18 (3) ◽  
pp. 187-196 ◽  
Author(s):  
Jun-ichi Onami ◽  
Masato Nikaido ◽  
Hideyuki Mannen ◽  
Norihiro Okada
Keyword(s):  
Genomic Expansion

scholarly journals Genomic expansion and clustering of ZAD‐containing C2H2 zinc‐finger genes in Drosophila

EMBO Reports ◽  
2002 ◽  
Vol 3 (12) ◽  
pp. 1158-1162 ◽  
Author(s):  
Ho‐Ryun Chung ◽  
Ulrich Schäfer ◽  
Herbert Jäckle ◽  
Siegfried Böhm
Keyword(s):  
Zinc Finger ◽  
C2h2 Zinc Finger ◽  
Zinc Finger Genes ◽  
Genomic Expansion

scholarly journals Rapid genomic expansion and purging associated with habitat transitions in a clade of beach crustaceans (Haustoriidae: Amphipoda)

2020 ◽  
Author(s):  
Zachary B. Hancock ◽  
Faith O. Hardin ◽  
Archana Murthy ◽  
Andrew Hillhouse ◽  
J. Spencer Johnston
Keyword(s):  
Body Size ◽  
Genome Size ◽  
Size Variation ◽  
Data Availability ◽  
Genome Size Variation ◽  
The North ◽  
Physiological Constraint ◽  
Line Elements ◽  
The Relationship ◽  
Genomic Expansion

AbstractGenome sizes vary by orders of magnitude across the Tree of Life and lack any correlation with organismal complexity. Some crustacean orders, such as amphipods, have genome sizes that correlate with body size, temperature, and water depth, indicating that natural selection may constrain genome sizes due to physiological pressures. In this study, we examine the relationship between genome size, repetitive content, and environmental variables on a clade of sand-burrowing amphipods (Haustoriidae) that are distributed across the Gulf of Mexico and the North Atlantic. We uncover a 6-fold genome size variation within a clade that is less than 7 million years old. Unlike previous studies, we find no correlation between genome size and latitude, but do uncover a significant relationship between genome size and body length. Further, we find that the proportion of repetitive content predicts genome size, and that the largest genomes appear to be driven by expansions of LINE elements. Finally, we find evidence of genomic purging and body size reduction in two lineages that have independently colonized warm brackish waters, possibly indicating a strong physiological constraint of transitioning from surf-swept beaches to protected bays.Significance StatementThe evolution of genome size has been a long-standing puzzle in biology. In this work, we find that genome sizes may be driven by different selection regimes following shifts to a new habitat. Dramatic genome size changes can occur rapidly, in only a few million years.Data Availability StatementRaw data sheets have been deposited on Dryad: SUBMITTED. Raw sequence reads are available at from NCBI under Bioproject SUBMITTED.

scholarly journals In silico study of wall-associated kinase family reveals large-scale genomic expansion potentially connected with functional diversification in Populus

2014 ◽  
Vol 10 (5) ◽  
pp. 1135-1147 ◽  
Author(s):  
Kévin Tocquard ◽  
Clément Lafon-Placette ◽  
Daniel Auguin ◽  
Beatriz Muries ◽  
Gisèle Bronner ◽  
...  
Keyword(s):  
In Silico ◽  
Large Scale ◽  
Functional Diversification ◽  
Kinase Family ◽  
In Silico Study ◽  
Genomic Expansion
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