Cytogenetic Features of Human Head and Body Lice (Phthiraptera: Pediculidae)

The genus Pediculus L. that parasitize humans comprise two subspecies: the head lice Pediculus humanus capitis De Geer and the body lice Pediculus humanus humanus De Geer. Despite the 200 yr of the first description of these two species, there is still a long debate about their taxonomic status. Som...

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Autores principales:	Papeschi, Alba Graciela, Toloza, Ariel Ceferino
Publicado:	2015
Materias:	C-banding holokinetic chromosome karyotype Pediculus humanus capitis Pediculus humanus humanus chromatin insect protein animal Argentina child classification female genetics human male meiosis metabolism parasitology pediculosis Pediculus preschool child Animals Child Child, Preschool Chromatin Female Humans Insect Proteins Karyotype Lice Infestations Male Meiosis
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00222585_v52_n5_p918_Josebressa http://hdl.handle.net/20.500.12110/paper_00222585_v52_n5_p918_Josebressa
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00222585_v52_n5_p918_Josebressa
record_format	dspace
spelling	paper:paper_00222585_v52_n5_p918_Josebressa2023-06-08T14:48:32Z Cytogenetic Features of Human Head and Body Lice (Phthiraptera: Pediculidae) Papeschi, Alba Graciela Toloza, Ariel Ceferino C-banding holokinetic chromosome karyotype Pediculus humanus capitis Pediculus humanus humanus chromatin insect protein animal Argentina child chromatin classification female genetics human karyotype male meiosis metabolism parasitology pediculosis Pediculus preschool child Animals Argentina Child Child, Preschool Chromatin Female Humans Insect Proteins Karyotype Lice Infestations Male Meiosis Pediculus The genus Pediculus L. that parasitize humans comprise two subspecies: the head lice Pediculus humanus capitis De Geer and the body lice Pediculus humanus humanus De Geer. Despite the 200 yr of the first description of these two species, there is still a long debate about their taxonomic status. Some authors proposed that these organisms are separate species, conspecifics, or grouped in clades. The sequencing of both forms indicated that the difference between them is one gene absent in the head louse. However, their chromosomal number remains to be determined. In this study, we described the male and female karyotypes, and male meiosis of head and body lice, and examined the chromatin structure by means of C-banding. In P. h. humanus and P. h. capitis, the diploid chromosome complement was 2n = 12 in both sexes. In oogonial prometaphase and metaphase and spermatogonial metaphase, it is evident that chromosomes lack of a primary constriction. No identifiable sex chromosomes or B chromosomes were observed in head and body lice. Neither chiasmata nor chromatin connections between homologous chromosomes were detected in male meiosis. The meiotic behaviour of the chromosomes showed that they are holokinetic. C-banding revealed the absence of constitutive heterochromatin. Our results provide relevant information to be used in mapping studies of genes associated with sex determination and environmental sensing and response. © The Authors 2015. Fil:Papeschi, A.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Toloza, A.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00222585_v52_n5_p918_Josebressa http://hdl.handle.net/20.500.12110/paper_00222585_v52_n5_p918_Josebressa
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-banding holokinetic chromosome karyotype Pediculus humanus capitis Pediculus humanus humanus chromatin insect protein animal Argentina child chromatin classification female genetics human karyotype male meiosis metabolism parasitology pediculosis Pediculus preschool child Animals Argentina Child Child, Preschool Chromatin Female Humans Insect Proteins Karyotype Lice Infestations Male Meiosis Pediculus
spellingShingle	C-banding holokinetic chromosome karyotype Pediculus humanus capitis Pediculus humanus humanus chromatin insect protein animal Argentina child chromatin classification female genetics human karyotype male meiosis metabolism parasitology pediculosis Pediculus preschool child Animals Argentina Child Child, Preschool Chromatin Female Humans Insect Proteins Karyotype Lice Infestations Male Meiosis Pediculus Papeschi, Alba Graciela Toloza, Ariel Ceferino Cytogenetic Features of Human Head and Body Lice (Phthiraptera: Pediculidae)
topic_facet	C-banding holokinetic chromosome karyotype Pediculus humanus capitis Pediculus humanus humanus chromatin insect protein animal Argentina child chromatin classification female genetics human karyotype male meiosis metabolism parasitology pediculosis Pediculus preschool child Animals Argentina Child Child, Preschool Chromatin Female Humans Insect Proteins Karyotype Lice Infestations Male Meiosis Pediculus
description	The genus Pediculus L. that parasitize humans comprise two subspecies: the head lice Pediculus humanus capitis De Geer and the body lice Pediculus humanus humanus De Geer. Despite the 200 yr of the first description of these two species, there is still a long debate about their taxonomic status. Some authors proposed that these organisms are separate species, conspecifics, or grouped in clades. The sequencing of both forms indicated that the difference between them is one gene absent in the head louse. However, their chromosomal number remains to be determined. In this study, we described the male and female karyotypes, and male meiosis of head and body lice, and examined the chromatin structure by means of C-banding. In P. h. humanus and P. h. capitis, the diploid chromosome complement was 2n = 12 in both sexes. In oogonial prometaphase and metaphase and spermatogonial metaphase, it is evident that chromosomes lack of a primary constriction. No identifiable sex chromosomes or B chromosomes were observed in head and body lice. Neither chiasmata nor chromatin connections between homologous chromosomes were detected in male meiosis. The meiotic behaviour of the chromosomes showed that they are holokinetic. C-banding revealed the absence of constitutive heterochromatin. Our results provide relevant information to be used in mapping studies of genes associated with sex determination and environmental sensing and response. © The Authors 2015.
author	Papeschi, Alba Graciela Toloza, Ariel Ceferino
author_facet	Papeschi, Alba Graciela Toloza, Ariel Ceferino
author_sort	Papeschi, Alba Graciela
title	Cytogenetic Features of Human Head and Body Lice (Phthiraptera: Pediculidae)
title_short	Cytogenetic Features of Human Head and Body Lice (Phthiraptera: Pediculidae)
title_full	Cytogenetic Features of Human Head and Body Lice (Phthiraptera: Pediculidae)
title_fullStr	Cytogenetic Features of Human Head and Body Lice (Phthiraptera: Pediculidae)
title_full_unstemmed	Cytogenetic Features of Human Head and Body Lice (Phthiraptera: Pediculidae)
title_sort	cytogenetic features of human head and body lice (phthiraptera: pediculidae)
publishDate	2015
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00222585_v52_n5_p918_Josebressa http://hdl.handle.net/20.500.12110/paper_00222585_v52_n5_p918_Josebressa
work_keys_str_mv	AT papeschialbagraciela cytogeneticfeaturesofhumanheadandbodylicephthirapterapediculidae AT tolozaarielceferino cytogeneticfeaturesofhumanheadandbodylicephthirapterapediculidae
_version_	1768543597019267072

Cytogenetic Features of Human Head and Body Lice (Phthiraptera: Pediculidae)

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