title: Micro-evolution in grasshoppers mediated by polymorphic Robertsonian translocations.
abstract: This review focuses on grasshoppers that are polymorphic for Robertsonian translocations because in these organisms the clarity of meiotic figures allows the study of both chiasma distribution and the orientation of trivalents and multivalents in metaphase I. Only five species of such grasshoppers were found in the literature, and all of them were from the New World: Oedaleonotus enigma (Scudder) (Orthoptera: Acrididae), Leptysma argentina Bruner, Dichroplus pratensis Bruner, Sinipta dalmani Stål, and Cornops aquaticum Bruner. A general feature of these species (except O. enigma) is that fusion carriers suffer a marked reduction of proximal and interstitial (with respect to the centromere) chiasma frequency; this fact, along with the reduction in the number of linkage groups with the consequent loss of independent segregation, produces a marked decrease of recombination in fusion carriers. This reduction in recombination has led to the conclusion that Robertsonian polymorphic grasshopper species share some properties with inversion polymorphic species of Drosophila, such as the central-marginal pattern (marginal populations are monomorphic, central populations are highly polymorphic). This pattern might be present in D. pratensis, which is certainly the most complex Robertsonian polymorphism system in the present study. However, L. argentina and C. aquaticum do not display this pattern. This issue is open to further research. Since C. aquaticum is soon to be released in South Africa as a biological control, the latitudinal pattern found in South America may repeat there. This experiment's outcome is open and deserves to be followed.
authors.affiliation: Laboratorio de Genética, Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Ciudad Universitaria, Buenos Aires, Argentina. colombop@ege.fcen.uba.ar
authors.forename: Pablo C
authors.initials: PC
authors.lastname: Colombo
mesh_terms: D000818:Animals; D005075:Biological Evolution; D059006:Chromosomes, Insect; D006110:Grasshoppers / Q000235:genetics*; D006824:Hybridization, Genetic; D008540:Meiosis; D011110:Polymorphism, Genetic; D014178:Translocation, Genetic
references.citation: Heredity (Edinb). 1975 Dec;35(3):375-87
references.pmid: 1061710
references.citation: Proc Natl Acad Sci U S A. 1986 Nov;83(21):8245-8
references.pmid: 16593777
references.citation: Genetics. 1993 Mar;133(3):649-67
references.pmid: 8454207
references.citation: Chromosome Res. 1997 Feb;5(1):69-71
references.pmid: 9088646
references.citation: Proc Natl Acad Sci U S A. 1988 Aug;85(15):5597-600
references.pmid: 16593967
references.citation: Proc Natl Acad Sci U S A. 2001 Jan 2;98(1):171-5
references.pmid: 11136254
references.citation: Cytogenet Genome Res. 2002;96(1-4):66-74
references.pmid: 12438782
references.citation: Chromosoma. 1967;21(1):163-80
references.pmid: 5603285
references.citation: Heredity (Edinb). 2001 Sep;87(Pt 3):305-13
references.pmid: 11737277
references.citation: Heredity (Edinb). 1997 Aug;79 ( Pt 2):214-27
references.pmid: 9279014
references.citation: Genetics. 2002 Nov;162(3):1355-66
references.pmid: 12454079
references.citation: Genetica. 2002;114(1):35-40
references.pmid: 11990757
references.citation: Evolution. 1979 Mar;33(1Part1):234-251
references.pmid: 28568063
references.citation: Cytogenet Genome Res. 2002;96(1-4):276-86
references.pmid: 12438809
references.citation: Prog Clin Biol Res. 1982;96:155-77
references.pmid: 7178156
references.citation: Chromosoma. 1967;22(3):241-57
references.pmid: 6077845
references.citation: Chromosoma. 2009 Jun;118(3):377-89
references.pmid: 19238420
references.citation: Cold Spring Harb Symp Quant Biol. 1959;24:87-105
references.pmid: 13807991
references.citation: Cold Spring Harb Symp Quant Biol. 1955;20:276-87
references.pmid: 13433570
references.citation: Cell. 2004 Apr 2;117(1):29-45
references.pmid: 15066280
references.citation: Chromosoma. 1968;25(1):40-74
references.pmid: 5719038
references.citation: Chromosoma. 1972;36(4):343-74
references.pmid: 4115271
references.citation: Chromosoma. 1970;31(3):291-308
references.pmid: 5489362
references.citation: Chromosoma. 1968;25(2):121-40
references.pmid: 5709391
references.citation: Am J Hum Genet. 2000 Jun;66(6):1911-26
references.pmid: 10801387
references.citation: J Evol Biol. 2004 Jan;17(1):76-82
references.pmid: 15000650
references.citation: Hereditas. 2000;133(3):189-93
references.pmid: 11433962
references.citation: Cytogenet Cell Genet. 1992;61(3):211-20
references.pmid: 1424812
references.citation: Genome. 1988 Dec;30(6):947-55
references.pmid: 3234757
references.citation: Heredity (Edinb). 2001 Oct;87(Pt 4):480-4
references.pmid: 11737297
references.citation: J Hered. 2011 Mar-Apr;102(2):184-95
references.pmid: 21172824
references.citation: Hereditas. 2001;134(3):245-54
references.pmid: 11833288
references.citation: Cell. 1994 Oct 21;79(2):283-92
references.pmid: 7954796
references.citation: Genetica. 2004 May;121(1):25-31
references.pmid: 15098734
references.citation: Genet Mol Biol. 2009 Jan;32(1):91-5
references.pmid: 21637651