Possible origin of polymorphism for chromosome number in the assassin bug Zelurus femoralis longispinis (Reduviidae: Reduviinae)
In this study, we analysed a population of Zelurus femoralis longispinis polymorphic for chromosomal number. The fundamental karyotype of this subspecies is 2n=22=20A+XY (male), but individuals with 2n=23=20A+XY+extra chromosome have been found at high frequency and collected at different time perio...
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I28-R145-paper_00244066_v110_n4_p757_Poggio_oai2020-10-19 Poggio, M.G. Provecho, Y.M. Papeschi, A.G. Bressa, M.J. 2013 In this study, we analysed a population of Zelurus femoralis longispinis polymorphic for chromosomal number. The fundamental karyotype of this subspecies is 2n=22=20A+XY (male), but individuals with 2n=23=20A+XY+extra chromosome have been found at high frequency and collected at different time periods. We examined male meiotic behaviour, average length as percentage of the sex chromosomes, the content, distribution and composition of heterochromatin, and the number and location of ribosomal DNA in the two cytotypes found. The meiotic behaviour of the extra chromosome was highly regular and similar to that of sex chromosomes. The average length of the sex chromosomes in individuals not carrying the extra chromosome was significantly greater than in those carrying it. The results support a hypothesis that the extra chromosome might have originated by fragmentation of the original X chromosome into two unequal-sized chromosomes (X1 and X2), leading to an X1X2Y multiple system. Maintenance of the polymorphism with time appears to indicate that the new chromosomal variant is neutral or at least not detrimental, or that it could be selectively advantageous. This polymorphic population represents direct evidence of a multiple sex chromosome system originating through fragmentation of a single X in Reduviidae as well as in Heteroptera. © 2013 The Linnean Society of London. Fil:Poggio, M.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Provecho, Y.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Papeschi, A.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bressa, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_00244066_v110_n4_p757_Poggio info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Biol. J. Linn. Soc. 2013;110(4):757-764 C- and fluorescent bands Chromosomal fragmentation Evolution FISH Holokinetic chromosomes Multiple sex-chromosome system chromosome cytology evolutionary biology genetic structure insect karyotype polymorphism Heteroptera Reduviidae Reduviinae Zelurus Possible origin of polymorphism for chromosome number in the assassin bug Zelurus femoralis longispinis (Reduviidae: Reduviinae) info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00244066_v110_n4_p757_Poggio_oai |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-145 |
collection |
Repositorio Digital de la Universidad de Buenos Aires (UBA) |
topic |
C- and fluorescent bands Chromosomal fragmentation Evolution FISH Holokinetic chromosomes Multiple sex-chromosome system chromosome cytology evolutionary biology genetic structure insect karyotype polymorphism Heteroptera Reduviidae Reduviinae Zelurus |
spellingShingle |
C- and fluorescent bands Chromosomal fragmentation Evolution FISH Holokinetic chromosomes Multiple sex-chromosome system chromosome cytology evolutionary biology genetic structure insect karyotype polymorphism Heteroptera Reduviidae Reduviinae Zelurus Poggio, M.G. Provecho, Y.M. Papeschi, A.G. Bressa, M.J. Possible origin of polymorphism for chromosome number in the assassin bug Zelurus femoralis longispinis (Reduviidae: Reduviinae) |
topic_facet |
C- and fluorescent bands Chromosomal fragmentation Evolution FISH Holokinetic chromosomes Multiple sex-chromosome system chromosome cytology evolutionary biology genetic structure insect karyotype polymorphism Heteroptera Reduviidae Reduviinae Zelurus |
description |
In this study, we analysed a population of Zelurus femoralis longispinis polymorphic for chromosomal number. The fundamental karyotype of this subspecies is 2n=22=20A+XY (male), but individuals with 2n=23=20A+XY+extra chromosome have been found at high frequency and collected at different time periods. We examined male meiotic behaviour, average length as percentage of the sex chromosomes, the content, distribution and composition of heterochromatin, and the number and location of ribosomal DNA in the two cytotypes found. The meiotic behaviour of the extra chromosome was highly regular and similar to that of sex chromosomes. The average length of the sex chromosomes in individuals not carrying the extra chromosome was significantly greater than in those carrying it. The results support a hypothesis that the extra chromosome might have originated by fragmentation of the original X chromosome into two unequal-sized chromosomes (X1 and X2), leading to an X1X2Y multiple system. Maintenance of the polymorphism with time appears to indicate that the new chromosomal variant is neutral or at least not detrimental, or that it could be selectively advantageous. This polymorphic population represents direct evidence of a multiple sex chromosome system originating through fragmentation of a single X in Reduviidae as well as in Heteroptera. © 2013 The Linnean Society of London. |
format |
Artículo Artículo publishedVersion |
author |
Poggio, M.G. Provecho, Y.M. Papeschi, A.G. Bressa, M.J. |
author_facet |
Poggio, M.G. Provecho, Y.M. Papeschi, A.G. Bressa, M.J. |
author_sort |
Poggio, M.G. |
title |
Possible origin of polymorphism for chromosome number in the assassin bug Zelurus femoralis longispinis (Reduviidae: Reduviinae) |
title_short |
Possible origin of polymorphism for chromosome number in the assassin bug Zelurus femoralis longispinis (Reduviidae: Reduviinae) |
title_full |
Possible origin of polymorphism for chromosome number in the assassin bug Zelurus femoralis longispinis (Reduviidae: Reduviinae) |
title_fullStr |
Possible origin of polymorphism for chromosome number in the assassin bug Zelurus femoralis longispinis (Reduviidae: Reduviinae) |
title_full_unstemmed |
Possible origin of polymorphism for chromosome number in the assassin bug Zelurus femoralis longispinis (Reduviidae: Reduviinae) |
title_sort |
possible origin of polymorphism for chromosome number in the assassin bug zelurus femoralis longispinis (reduviidae: reduviinae) |
publishDate |
2013 |
url |
http://hdl.handle.net/20.500.12110/paper_00244066_v110_n4_p757_Poggio http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00244066_v110_n4_p757_Poggio_oai |
work_keys_str_mv |
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_version_ |
1766026610285215744 |