Sex chromosome pairing patterns in male mice of novel Sxr genotypes

Chromosoma ◽  
1989 ◽  
Vol 97 (5) ◽  
pp. 390-395 ◽  
Author(s):  
C. Tease ◽  
B. M. Cattanach
Keyword(s):  
Chromosome Pairing ◽  
Sex Chromosome ◽  
Male Mice

Homologous expressed genes in the human sex chromosome pairing region

Nature ◽  
1985 ◽  
Vol 317 (6039) ◽  
pp. 739-741 ◽  
Author(s):  
V. Buckle ◽  
C. Mondello ◽  
S. Darling ◽  
I. W. Craig ◽  
P. N. Goodfellow
Keyword(s):  
Chromosome Pairing ◽  
Sex Chromosome ◽  
Pairing Region

scholarly journals Sex Differences in Ischemic Stroke Sensitivity Are Influenced by Gonadal Hormones, Not by Sex Chromosome Complement

2014 ◽  
Vol 35 (2) ◽  
pp. 221-229 ◽  
Author(s):  
Bharti Manwani ◽  
Kathryn Bentivegna ◽  
Sharon E Benashski ◽  
Venugopal Reddy Venna ◽  
Yan Xu ◽  
...  
Keyword(s):  
Sex Differences ◽  
Ischemic Stroke ◽  
Sex Hormones ◽  
Sex Chromosome ◽  
Chromosome Complement ◽  
Serum Testosterone ◽  
Gonadal Hormones ◽  
Epidemiologic Studies ◽  
Artery Occlusion ◽  
Male Mice

Epidemiologic studies have shown sex differences in ischemic stroke. The four core genotype (FCG) mouse model, in which the testes determining gene, Sry, has been moved from Y chromosome to an autosome, was used to dissociate the effects of sex hormones from sex chromosome in ischemic stroke outcome. Middle cerebral artery occlusion (MCAO) in gonad intact FCG mice revealed that gonadal males (XXM and XYM) had significantly higher infarct volumes as compared with gonadal females (XXF and XYF). Serum testosterone levels were equivalent in adult XXM and XYM, as was serum estrogen in XXF and XYF mice. To remove the effects of gonadal hormones, gonadectomized FCG mice were subjected to MCAO. Gonadectomy significantly increased infarct volumes in females, while no change was seen in gonadectomized males, indicating that estrogen loss increases ischemic sensitivity. Estradiol supplementation in gonadectomized FCG mice rescued this phenotype. Interestingly, FCG male mice were less sensitive to effects of hormones. This may be due to enhanced expression of the transgene Sry in brains of FCG male mice. Sex differences in ischemic stroke sensitivity appear to be shaped by organizational and activational effects of sex hormones, rather than sex chromosomal complement.

scholarly journals The Program of Sex Chromosome Pairing in Meiosis Is Highly Conserved Across Marsupial Species

Genetics ◽  
2005 ◽  
Vol 170 (2) ◽  
pp. 793-799 ◽  
Author(s):  
Jesús Page ◽  
Soledad Berríos ◽  
María Teresa Parra ◽  
Alberto Viera ◽  
José Ángel Suja ◽  
...  
Keyword(s):  
Chromosome Pairing ◽  
Sex Chromosome ◽  
Marsupial Species

Sex Chromosome Pairing and Extensive NOR Polymorphism inWadicosa fidelis(Araneae: Lycosidae)

2013 ◽  
Vol 141 (1) ◽  
pp. 43-49 ◽  
Author(s):  
M. Forman ◽  
P. Nguyen ◽  
V. Hula ◽  
J. Král
Keyword(s):  
Chromosome Pairing ◽  
Sex Chromosome ◽  
Nor Polymorphism

Ultrastructural analysis of the X1X2X3O sex chromosome system during the spermatogenesis of Tegenaria domestica (Arachnida)

1982 ◽  
Vol 58 (1) ◽  
pp. 411-422
Author(s):  
R. Benavente ◽  
R. Wettstein ◽  
M. Papa
Keyword(s):  
Synaptonemal Complex ◽  
Chromosome Pairing ◽  
Sex Chromosomes ◽  
Ultrastructural Study ◽  
Chromosome Structure ◽  
Sex Chromosome ◽  
X Chromosomes ◽  
Sex Chromosome System ◽  
Available Information ◽  
Dense Chromatin

An ultrastructural study was performed on the sex chromosomes (male X1X2X3O) during the spermatogenesis of Tegenaria domestica (Arachnida, Agelenidae). This study was carried out using random and serially cut sections. During pachytene and diplotene the three X chromosomes are longitudinally paired. Each of these consists of a central core of condensed chromatin, surrounded by a field of dense chromatin projections through which the chromosomes are in contact with one another. These projections may be responsible for the recognition and pairing of the sex chromosomes and in some way participate in their non-disjunction during anaphase I. A study of the structure and behaviour of the sex chromosomes during spermatogenesis is also presented. The available information on non-synaptonemal complex-mediated chromosome pairing and a systematization of sex chromosome structure in spiders are discussed.

Sibling species of the blackfly Prosimulium onychodactylum (Simuliidae, Diptera): a salivary gland chromosome study

1983 ◽  
Vol 61 (12) ◽  
pp. 2816-2835 ◽  
Author(s):  
Lester J. Newman
Keyword(s):  
Salivary Gland ◽  
Reproductive Isolation ◽  
Sibling Species ◽  
Chromosome Pairing ◽  
Sex Chromosomes ◽  
Sex Chromosome ◽  
Homologous Pairing ◽  
Chromosome Markers ◽  
Chromosome Arm ◽  
Backcross Hybrids

Larvae of the morphospecies Prosimulium onychodactylum collected from two streams in northern Oregon are divided into 11 sibling species based on fixed and polymorphic inversions. The sibling species have differentiated sex chromosomes; each sibling species falls into one of two groups based on the chromosome arm which carries the sex chromosome markers. Males exhibit lack of homologous pairing or inversion heterzygosity and females have complete chromosome pairing or inversion homozygosity. There is a succession of sibling species which mature in the streams from January through September. Mature larvae of each sibling species are present for about 6 weeks; some are synchronic while others are allochronic. Some of the sibling species occur in the same stream and others are in different streams. Sibling species which are both synchronic and sympatric appear to be reproductively isolated. Reproductive isolation may not be complete for sibling species which are normally allopatric or allochronic; small numbers of F1 and backcross hybrids were found between some of these sibling species. The division of the morphospecies into sibling species was also observed in collections from Washington through northern California.

Pattern of X–Y chromosome pairing in the Japanese field vole, Microtus montebelli

Genome ◽  
1997 ◽  
Vol 40 (6) ◽  
pp. 829-833 ◽  
Author(s):  
P. M. Borodin ◽  
M. B. Rogatcheva ◽  
K. Koyasu ◽  
K. Fukuta ◽  
K. Mekada ◽  
...  
Keyword(s):  
Synaptonemal Complex ◽  
Chromosome Pairing ◽  
Sex Chromosomes ◽  
Sex Chromosome ◽  
Chromosomal Evolution ◽  
The Other ◽  
Field Vole ◽  
Y Chromosomes ◽  
The One ◽  
Ancestral Type

Pairing of X and Y chromosomes at meiotic prophase in males of Microtus montebelli was analyzed. The sex chromosomes form a synaptonemal complex at pachytene and end-to-end association at diakinesis – metaphase I in two species of the genus Microtus (M. montebelli and M. oeconomus) only, while they do not pair at all in the other species of this genus that have been studied so far. These data confirm that M. montebelli and M. oeconomus are very closely related in their origin. It is suggested that the sex chromosomes of M. montebelli and M. oeconomus display the ancestral type of X–Y pairing. The lack of X–Y pairing in most species of Microtus appeared after the split in lineage that led to M. oeconomus and M. montebelli on the one hand and the remaining species on the other.Key words: Microtus montebelli, arvicoline phylogeny, synaptic sex chromosome, synaptonemal complex, chromosomal evolution.

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