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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.


Documento: Artículo
Título:Cytogenetic Features of Human Head and Body Lice (Phthiraptera: Pediculidae)
Autor:Josébressa, M.; Papeschi, A.G.; Toloza, A.C.
Filiación:Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA), Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Centro de Investigaciones de Plagas e Insecticidas (UNIDEF/ CONICET), Juan Bautista de La Salle 4397, Villa Martelli, Buenos Aires, Argentina
Palabras clave: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
Página de inicio:918
Página de fin:924
Título revista:Journal of Medical Entomology
Título revista abreviado:J. Med. Entomol.
CAS:Chromatin; Insect Proteins


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---------- APA ----------
Josébressa, M., Papeschi, A.G. & Toloza, A.C. (2015) . Cytogenetic Features of Human Head and Body Lice (Phthiraptera: Pediculidae). Journal of Medical Entomology, 52(5), 918-924.
---------- CHICAGO ----------
Josébressa, M., Papeschi, A.G., Toloza, A.C. "Cytogenetic Features of Human Head and Body Lice (Phthiraptera: Pediculidae)" . Journal of Medical Entomology 52, no. 5 (2015) : 918-924.
---------- MLA ----------
Josébressa, M., Papeschi, A.G., Toloza, A.C. "Cytogenetic Features of Human Head and Body Lice (Phthiraptera: Pediculidae)" . Journal of Medical Entomology, vol. 52, no. 5, 2015, pp. 918-924.
---------- VANCOUVER ----------
Josébressa, M., Papeschi, A.G., Toloza, A.C. Cytogenetic Features of Human Head and Body Lice (Phthiraptera: Pediculidae). J. Med. Entomol. 2015;52(5):918-924.