Theoretical Bases for Karyotype Evolution. 1. The Minimum-Interaction Hypothesis

Imai, Hirotami T.; Maruyama, Takeo; Gojobori, Takashi; Inoue, Yutaka; Crozier, Ross H.

doi:10.1086/284612

Cited by 96 publications

(88 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In fact, a general trend of chromosome number increase by centric fission within some animal lineages led to the proposal of the 'minimum interaction hypothesis' , which posited that such fissions are universally favored because they reduce the probability of potentially costly reciprocal translocations (Imai et al, 1986). More recently, Pardo-Manuel de Villena and Sapienza (2001a) provided an elegant mechanism for mammalian chromosomal evolution by fission and fusion based on direct selection on chromosomal structure.…”

Section: Discussionmentioning

confidence: 99%

Comparative linkage maps suggest that fission, not polyploidy, underlies near-doubling of chromosome number within monkeyflowers (Mimulus; Phrymaceae)

Fishman

et al. 2014

Heredity

View full text Add to dashboard Cite

Changes in chromosome number and structure are important contributors to adaptation, speciation and macroevolution. In flowering plants, polyploidy and subsequent reductions in chromosome number by fusion are major sources of chromosomal evolution, but chromosome number increase by fission has been relatively unexplored. Here, we use comparative linkage mapping with gene-based markers to reconstruct chromosomal synteny within the model flowering plant genus Mimulus (monkeyflowers). Two sections of the genus with haploid numbers X14 have been inferred to be relatively recent polyploids because they are phylogenetically nested within numerous taxa with low base numbers (n ¼ 8-10). We combined multiple data sets to build integrated genetic maps of the M. guttatus species complex (section Simiolus, n ¼ 14) and the M. lewisii group (section Erythranthe; n ¼ 8), and then aligned the two integrated maps using 4100 shared markers. We observed strong segmental synteny between M. lewisii and M. guttatus maps, with essentially 1-to-1 correspondence across each of 16 chromosomal blocks. Assuming that the M. lewisii (and widespread) base number of 8 is ancestral, reconstruction of 14 M. guttatus chromosomes requires at least eight fission events (likely shared by Simiolus and sister section Paradanthus (n ¼ 16)), plus two fusion events. This apparent burst of fission in the yellow monkeyflower lineages raises new questions about mechanisms and consequences of chromosomal fission in plants. Our comparative maps also provide insight into the origins of a chromosome exhibiting centromere-associated female meiotic drive and create a framework for transferring M. guttatus genome resources across the entire genus.

show abstract

Section: Discussionmentioning

confidence: 99%

Comparative linkage maps suggest that fission, not polyploidy, underlies near-doubling of chromosome number within monkeyflowers (Mimulus; Phrymaceae)

Fishman

et al. 2014

Heredity

View full text Add to dashboard Cite

show abstract

“…It suggests that chromosome numbers tend to reduce in evolution, mainly by centric fusion. An alternative model, the "minimum interaction hypothesis" was recently proposed by Imai, Maruyama et al (1986). Here chromosome numbers as a whole are postulated to increase by centric fission (Robertsonian fission), thus minimizing the genetic risk resulting from reciprocal translocation, the occurrence of which is more likely between large chromosomes in low-numbered karyotypes (n < 12 in ants) than among small ones in high numbered karyotypes (n > 12 in ants) …”

Section: Resultsmentioning

confidence: 99%

Notes on the Remarkable Karyology of the Primitive Ant Nothomyrmecia Macrops, and of the Related Genus Myrmecia (Hymenoptera: Formicidae)

Imai

Taylor

Kubota³

et al. 1990

Psyche: A Journal of Entomology

Self Cite

View full text Add to dashboard Cite

“…This is especially true when chromosomal difference is correlated to morphological variation (Tanaka 1969). Karyotype evolutions are one of the most important aspects of the whole evolutionary processes (Imai et al 1986) and considered as an isolating mechanism in speciation and have their own evolutionary trends independent of genetic evolution (Imai et al 2001). Therefore, karyotype evolution generally tends towards an increasing number and terminal centromeric chromosomes (acrocentric).…”

Section: Discussionmentioning

confidence: 99%

Cytogenetical and ecological studies of some wild congeneric species in the Solanaceae distributed in upper Egypt

2010

View full text Add to dashboard Cite

ABSTRACT.Cytogenetical and ecological studies in some species of the Solanaceae were made in the Mediterranean-type ecosystem in Upper Egypt. The chromosome complement of Datura innoxia (2n=24) consisted of 24 median-centromeric chromosomes; that of D. stramonium (2n=24) consisted of 22 median-and two submedian-centromeric chromosomes; that of Hyoscyamus albus (2n=68) consisted of 62 median-and six submedian-centromeric chromosomes, that of H. muticus (2n=28) consisted of 21 median-and seven submedian-centromeric chromosomes; that of Withania somnifera (2n=36; new count) consisted of 27 median-and nine submedian-centromeric chromosomes; and that of Solanum nigrum (2n=72) consists of 68 median and four submedian-centromeric chromosomes. Thirty-three reproducible polymorphic bands were resulted after four RAPD-PCR primers; those bands were used for studying the genetics similarity among the species. Average similarity coeffi cient was ranged from 0.05 to 0.47. RAPD bands resulted after PCR: D. innoxia and D. stramonium showed fi ve bands each; H. albus and H. muticus showed two and one bands respectively; W. somnifera seven bands and S. nigrum showed 13 bands, different patterns were produced among congeneric species. Ionic status of hot water extract of the species revealed that Hyoscyamus species was more accumulated Na + and Ca ++ , while Datura species accumulated more K + and Mg ++ and W. somnifera and S nigrum were intermediate. These strategies of ionic accumulation were in relation to the different chromosome number of species, which might help for surviving the species in desert ecosystem.

show abstract

Theoretical Bases for Karyotype Evolution. 1. The Minimum-Interaction Hypothesis

Cited by 96 publications

References 0 publications

Comparative linkage maps suggest that fission, not polyploidy, underlies near-doubling of chromosome number within monkeyflowers (Mimulus; Phrymaceae)

Comparative linkage maps suggest that fission, not polyploidy, underlies near-doubling of chromosome number within monkeyflowers (Mimulus; Phrymaceae)

Notes on the Remarkable Karyology of the Primitive Ant Nothomyrmecia Macrops, and of the Related Genus Myrmecia (Hymenoptera: Formicidae)

Cytogenetical and ecological studies of some wild congeneric species in the Solanaceae distributed in upper Egypt

Contact Info

Product

Resources

About