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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Detalles Bibliográficos
Autores principales: Poggio, Maria Georgina, Provecho, Yael M., Papeschi, Alba Graciela, Bressa, Maria Jose
Publicado: 2013
Materias:
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
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244066_v110_n4_p757_Poggio
http://hdl.handle.net/20.500.12110/paper_00244066_v110_n4_p757_Poggio
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00244066_v110_n4_p757_Poggio
record_format dspace
spelling paper:paper_00244066_v110_n4_p757_Poggio2023-06-08T14:52:12Z Possible origin of polymorphism for chromosome number in the assassin bug Zelurus femoralis longispinis (Reduviidae: Reduviinae) Poggio, Maria Georgina Provecho, Yael M. Papeschi, Alba Graciela Bressa, Maria Jose 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 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. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244066_v110_n4_p757_Poggio http://hdl.handle.net/20.500.12110/paper_00244066_v110_n4_p757_Poggio
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (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, Maria Georgina
Provecho, Yael M.
Papeschi, Alba Graciela
Bressa, Maria Jose
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.
author Poggio, Maria Georgina
Provecho, Yael M.
Papeschi, Alba Graciela
Bressa, Maria Jose
author_facet Poggio, Maria Georgina
Provecho, Yael M.
Papeschi, Alba Graciela
Bressa, Maria Jose
author_sort Poggio, Maria Georgina
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 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244066_v110_n4_p757_Poggio
http://hdl.handle.net/20.500.12110/paper_00244066_v110_n4_p757_Poggio
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