Chromosome
Occurrence of multiple nucleolus organizer regions and intraspecific karyotype variation in Scaptotrigona xanthotricha Moure (Hymenoptera, Meliponini)
Authors: O.M.P. Duarte1, C.C.C. Martins1, A.M. Waldschmidt2 and M.A. Costa1
Scaptotrigona xanthotricha has a wide geographic distribution in the Brazilian Atlantic rainforest. One population from southeast and two from northeast Brazil were analyzed and were found to have chromosome polymorphisms. Although the chromosome number 2n = 34 is conserved in this species, karyotypic analysis revealed clear differences between .. Read More»
- Genet. Mol. Res. 8(3):
- vol8-3gmr598
- DOI:
- 10.4238/vol8-3gmr598
Occurrence of mutations in loci linked to Y chromosome in the offspring born to individuals exposed to ionizing radiation
Authors: J.T. Arruda
In September 1987, in Goiânia, GO, Brazil, one of the most serious radiological accidents occurred at a radiotherapy unit involving a source of cesium-137. An area of 2000 m2 was contaminated and 249 people were exposed, both externally and internally, to substantial doses of ionizing radiation, resulting in four fatalities due to acute radiation sy.. Read More»
- Genet. Mol. Res. 8(3):
- vol8-3ta021
- DOI:
- 10.4238/vol8-3ta021
Expressed sequence tag-PCR markers for identification of alien barley chromosome 2H in wheat
Authors: M.J. Wang H.D. Zou Z.S. Lin Y. Wu X. Chen Y.P. Yuan
We developed EST-PCR markers specific to barley chromosome 2H, for the purpose of effectively tracing alien chromosomes or chromosome parts in the wheat genetic background. The target alien chromosome 2H confers high resistance to pre-harvest sprouting, which is a worldwide natural disaster in wheat. A total of 120 primer pairs were selected by combining .. Read More»
- Genet. Mol. Res. 11(3):
- 2012.September.25.13
- DOI:
- 10.4238/2012.September.25.13
Association study between Y-chromosome haplogroups and susceptibility to spermatogenic impairment in Han People from southwest China
Authors: J. Ran T.T. Han X.P. Ding X. Wei L.Y. Zhang Y.P. Zhang T.J. Li S.S. Nie L. Chen
The non-recombining portion of the Y-chromosome contains numerous polymorphisms; therefore, it is now the most informative haplotyping system with wide-ranging applications. Idiopathic azoospermia and oligospermia are among the most important causes of male infertility. Different haplogroups may have different genetic backgrounds, which may be either suscept.. Read More»
- Genet. Mol. Res. 12(1):
- 2012.January.22.4
- DOI:
- 10.4238/2012.January.22.4
Karyotype studies on Lycoris radiata populations from China
Authors: Y.X. Liu1, Y.H. Zheng1,2, T. Xia1 and J. Zhou1
Lycoris radiata is an important medicinal and ornamental plant of China. In the present study, somatic chromosome counts and karyotype analyses, which are important aspects of plant phylogeny and evolution, were performed in 466 individuals from 25 L. radiata populations by root tip squash method. Chromosome counts revealed that 10 populations were diploi.. Read More»
- Genet. Mol. Res. 15(1):
- gmr.15017357
- DOI:
- 10.4238/gmr.15017357
Gene silencing during development ofin vitro-produced female bovine embryos
Authors: G.K.F. Merighe, F.H. Biase, W.K.F. Santos-Biase, M.S. Miranda,T.H.C. de Bem, Y.F. Watanabe and F.V. Meirelles
In early development, female embryos (XX) produce twice the transcripts of X-linked genes compared with male embryos (XY). During the course of development, inactivation of the X chromosome equilibrates gene dosage, making the development of female embryos viable. Moreover, the biotechnologies used for producing embr.. Read More»
- Genet. Mol. Res. 8(3):
- vol8-3gmr638
- DOI:
- 10.4238/vol8-3gmr638
FISH analysis and cytogenetic characterization of male meiotic prophase I in Acricotopus lucidus (Diptera, Chironomidae)
Authors: W. Staiber
In the chironomid Acricotopus lucidus, two cells with quite different chromosome complements arise from the last unequal spermatogonial mitosis, as a consequence of monopolar migration of the so-called germ line limited chromosomes (Ks). The cell receiving all the Ks, in addition to two sets of the regularly segregating somati.. Read More»
- Genet. Mol. Res. 8(4):
- vol8-4gmr664
- DOI:
- 10.4238/vol8-4gmr664
Chromosomal diversity in Hypostomus (Siluriformes, Loricariidae) with emphasis on physical mapping of 18S and 5S rDNA sites
Authors: J.B. Traldi D.R. Blanco M.R. Vicari J.F. Martinez R.L. Lui A.V. Barros R.F. Artoni O. Moreira-Filho
We examined chromosomes of three species of the genus Hypostomus, in order to contribute to the understanding of the karyotype evolution of this group. Specimens of H. ancistroides and H. nigromaculatus displayed differences in karyotype formulas, distribution and location of heterochromatin and nucleolus organizer regions when compared to other populations .. Read More»
- Genet. Mol. Res. 12(1):
- 2013.February.8.11
- DOI:
- 10.4238/2013.February.8.11
Identification of polymorphisms and transcriptional activity of the proto-oncogene KIT located on both autosomal and B chromosomes of the Chinese raccoon dog
Authors: Y.M. Li1, Y. Zhang1, W.J. Zhu1, S.Q. Yan1 and J.H. Sun2
B chromosomes are dispensable and co-exist with autosomal and sex chromosomes. The karyotype of the Chinese raccoon dog (Nyctereutes procyonoides procyonoides) comprises 0-4 B chromosomes. The proto-oncogene KIT is found on all B chromosomes of the Chinese raccoon dog. In the present study, partial DNA and mRNA sequences of KIT were amplified and sequence.. Read More»
- Genet. Mol. Res. 15(1):
- gmr.15017398
- DOI:
- 10.4238/gmr.15017398
Genotoxic potential of leaf extracts of Jatropha gossypiifolia L.
Authors: P.M. Almeida1,2, S.S. Ara�?ºjo1, I.R.M.R. Santos1, M.A. Marin-Morales3,A.M. Benko-Iseppon1, A.V. Santos4, K.P. Randau4 and A.C. Brasileiro-Vidal1
Jatropha gossypiifolia L. (Euphorbiaceae) is widely used in popular medicine. However, further toxicological studies are necessary for its reliable use. The present study aimed to evaluate the cytotoxic, genotoxic, and mutagenic effects of ethanolic and aqueous leaf extracts of J. gossypiifolia, using the test system Allium cepa. In addition, the phytoche.. Read More»
- Genet. Mol. Res. 15(1):
- 0.4238/gmr.15017415
- DOI:
- 0.4238/gmr.15017415