Research Article

Related GMR Articles

08/04/2009
Azoospermia; Chromosomal abnormality; Male infertility; Severe oligozoospermia; Y chromosome microdeletion

Infertility is defined as the inability to conceive a child after one year of regular unprotected intercourse; it is a major health problem affecting about 10-15% of all couples. Infertility is due to a male factor in approximately 50% of cases. The human Y chromosome contains genes necessary for gonadal differentiation into a testis and genes for complete spermatogenesis. We examined the ... more

G.G. Ceylan; C. Ceylan; H. Elyas
06/12/2015
Azoospermia; Male infertility; Severe oligozoospermia; Varicocele; Y chromosome microdeletion

The prevalence of Y chromosome microdeletions among azoospermic, severe oligozoospermic, moderate oligozoospermic, and mild oligozoospermic patients with varicocele-related and idiopathic infertility shows conflicting data in Asian countries. We aimed to detect this frequency in Northeast China, and investigated spermatogenic defects whether associated with varicocele or Y chromosome ... more

R.L. Dai; Y. Hou; F.B. Li; J.M. Yue; Q. Xi; R.Z. Liu
09/30/2007
C banding; Cichlidae; Crenicichla iguassuensis; Karyotype; Nucleolus organizer region banding; Perciformes

Three populations of the genus Crenicichla, namely Crenicichla iguassuensis, Crenicichla sp 1 and Crenicichla sp 2, from the Iguaçu River, were analyzed cytogenetically, and their nucleolus organizer regions, constitutive heterochromatin distribution and chromomycin A3 markings were studied. Karyotype analyses showed a diploid number of 48 ... more

S.M.H.K. Mizoguchi; A.L.B. Portela-Castro; I.C. Martins-Santos
09/30/2007
Chromosome evolution; Cratylia argentea; Cratylia mollis; Cytogenetics; Karyotype; tropical forage

Cratylia argentea and C. mollis (Fabaceae-Papilionoideae) are legume shrubs native to the Cerrado and Caatinga, respectively. Both species show great resistance to drought and high nutritive value, which makes them a valuable forage resource in tropical regions. Cytogenetic studies were carried out on accessions of C. argentea and C. mollis from ... more

S.M. Vargas; G.A. Torres; F.S. Sobrinho; A.V. Pereira; L.C. Davide
08/30/2007
Karyotype; Nucleolus organizer region band; Serrapinnus notomelas; Serrapinnus sp; Sexual chromosome ZZ/ZW

Four populations of Serrapinnus notomelas and one population of Serrapinnus sp.1, both belonging to the subfamily Cheirodontinae, were analyzed by Giemsa and silver nitrate impregnation techniques. We found 2n = 52 chromosomes for all populations, with interspecific differences in the karyotype formula; S. notomelas showed 16m + 22sm + 10st + 4a, with ... more

A.P. Santi-Rampazzo; P.B. Nishiyama; P.E.B. Ferreira; I.C. Martins-Santos
03/22/2007
Animal cytogenetics; Karyotype; Lady beetle

The goal of the present study was to determine if simple methods, especially hot saline solution (HSS) and MspI and HaeIII restriction endonucleases, which do not require special equipments, may be helpful in studies of genetic variability in the lady beetle, Cycloneda sanguinea. The HSS method extracted the heterochromatin region, suggesting that it is ... more

E.M.D. Maffei; S.G. Pompolo
02/12/2007
Heteroptera; Heteropycnosis; Karyotype; Lygaeidae; Nucleolar corpuscles; Nysius californicus

In Nysius californicus (family Lygaeidae, subfamily Orsillinae), a pest commonly known as the seed bug, the chromosome complement is 2n = 16 (12A + 2m + XY), testes are formed by seven seminiferous tubules covered by an orange-colored membrane, and spermatogenesis is cystic. At prophase, sex chromosomes are heteropycnotic and autosomes usually show a chiasma. At metaphase, ... more

H.V. Souza; H.E.M.C. Bicudo; M.M. Itoyama
11/17/2005
Amazon region; Anopheles albitarsis complex; Karyotype; Malaria

Anopheles (Nyssorhynchus) albitarsis sensu lato is an important malaria vector in Brazil, especially in the Brazilian Amazon region. Chromosome preparations of fourth-instar larvae of A. albitarsis from Iranduba and Coari (AM) and Ilha Comprida (SP) were analyzed for karyotype determination and to improve cytogenetic identification of this species. ... more

M.Silva Rafael; I.Pereira do Santos-Junior; W.Pedro Tadei; M.Anice Mure Sallum; O.Paulo Forattini
12/18/2009
Aplastodiscus; Hypsiboas; Karyotype; Nucleolus organizer region

Four species of Aplastodiscus and two species of Hypsiboas were cytogenetically compared. Aplastodiscus perviridis, A. cochranae, H. albomarginaus, and H. faber had 2n = 24 chromosomes, while A. albosignatus and A. leucopygius had 2n = 20 and 2n = 18 chromosomes, respectively. Aplastodiscus perviridis and A ... more

K.A. Carvalho; P.C.A. Garcia; S.M. Recco-Pimentel
07/19/2011
C-banding; FISH; G-banding; Karyotype; Nucleolar organizer regions; Turtle
C.E.S. Zago

Pages