Multiple sex-linked reciprocal translocations in a termite from Jamaica

@article{Luykx2005MultipleSR,
  title={Multiple sex-linked reciprocal translocations in a termite from Jamaica},
  author={P. Luykx and R. M. Syren},
  journal={Experientia},
  year={2005},
  volume={37},
  pages={819-820}
}
Males of the termiteIncisitermes schwarzi from Jamaica have a diploid chromosome number of 32. In male meiosis there are 7 bivalents, and a ring of 18 chromosomes equivalent to sex chromosomes, 9 X's and 9 Y's. This is the largest reciprocal translocation complex so far described for any plant or animal species. 

Figures from this paper

Holozygosity for sex-linked genes in males of the termiteIncisitermes schwarzi
The termiteIncisitermes schwarzi has multiple sex chromosomes that have arisen by repeated translocations between autosomes and previously existing sex chromosomes. Two sex-linked allozyme loci—Acp-1Expand
Holozygosity for sex-linked genes in males of the termiteIncisitermes schwarzi
TLDR
The findings of holozygosity and strong linkage disequilibrium suggest that differential selection in the two sexes at or near these loci may be responsible for the establishment of the translocations in this species. Expand
A reciprocal translocation radically reshapes sex-linked inheritance in the common frog.
TLDR
The first genomic view of a reciprocal translocation that causes two physically unconnected pairs of chromosomes to be coinherited as sex chromosomes is presented, suggesting that this species has unprecedented structural polymorphism in its sex chromosomes. Expand
First description of multivalent ring structures in eutherian mammalian meiosis: new chromosomal characterization of Cormura brevirostris (Emballonuridae, Chiroptera)
TLDR
Meiotic analysis demonstrated that at diplotene–diakinesis the cells had a ring conformation involving four chromosome pairs, which suggests the occurrence of multiple reciprocal translocations among these chromosomes, which is a very rare phenomenon in vertebrates, and has never been described in Eutheria. Expand
Chromosomal Evolution of Delena cancerides
The huntsman spider Delena cancerides (Sparassidae, Walckenaer) encompasses a number of chromosomally distinct populations (karyomorphs), including forms with entirely telocentric chromosomes, andExpand
Fixed fusion heterozygosity inDelena cancerides Walck. (Araneae: Sparassidae): an alternative to speciation by monobrachial fusion
TLDR
Data are presented to support the hypothesis that these races arose as the result of hybridisation between parental forms homozygous for different fusion combinations, and that selection for routine alternate segregation will produce stable sex-linked translocation heterozygosity. Expand
Unprecedented chromosomal diversity and behaviour modify linkage patterns and speciation potential: structural heterozygosity in an Australian spider
TLDR
The Huntsman spider Delena cancerides shows an extraordinary level of chromosomal diversity and meiotic complexity, but 14 populations form chains of chromosomes, and six of these populations show segregation behaviour which is beyond current understanding of meiotic processes. Expand
Insights into the karyotype evolution and speciation of the beetle Euchroma gigantea (Coleoptera: Buprestidae)
TLDR
Data indicate that chromosomal polymorphism in E. gigantea is greater than previously reported, and that the species can be a valuable model for cytogenetic studies. Expand
Resolution and evolution of the duck-billed platypus karyotype with an X1Y1X2Y2X3Y3X4Y4X5Y5 male sex chromosome constitution.
TLDR
The preparation of chromosome-specific probes from flow-sorted chromosomes and their application in the identification and classification of all platypus chromosomes are reported on, revealing that the male karyotype has 21 pairs of chromosomes and 10 unpaired chromosomes (E1-E10), which are linked by short regions of homology to form a multivalent chain in meiosis. Expand
The monotreme genome: a patchwork of reptile, mammal and unique features?
TLDR
The mysteries of the monotreme genome are recounted and how recently developed technology is used to identify chromosomes in mitosis, meiosis and sperm, to map genes to chromosomes, to unravel the sex chromosome system and the translocation chain and investigate X inactivation and genomic imprinting in monotremes is described. Expand
...
1
2
...

References

SHOWING 1-10 OF 13 REFERENCES
Permanent segmental interchange complex in the termite Incisitermes schwarzi
TLDR
This report is concerned with the chromosomes of I. schwarzi, which has the most extensive complex of reciprocal translocations so far described in any animal species. Expand
Chromosome Studies in the Myriapoda
TLDR
Otocryptops sexspinosus, a species of Chilopoda, possesses a 4X-5Y mechanism of the sex-chromosomes in the male and shows the chain-like association at the first metaphase. Expand
Achiasmatic meiosis and complex heterozygosity in female cyclopoid copepods (Copepoda, Crustacea)
TLDR
In Mesocyclops edax S.A. Forbes, 2n=14, a North American copepod, the females are heterozygous for several interchanges leading to the formation of large rings of chromosomes, comparable to those of the plant Oenothera, although no chiasmata are present. Expand
Intraspecific karyotypic differentiation in the Australian phasmatid Didymuria violescens (Leach)
TLDR
Karyotypic comparisons and analyses of the meiotic pairing relationships in interracial hybrids have shown that the differences derive in large part from a series of centric fusion events and X-autosome fusions, which together contribute to the reduction in chromosome number within the species. Expand
Permanent translocation heterozygosity in Viscum Album and V. Cruciatum: sex association, balanced lethals, sex ratios
TLDR
Female predominant sex ratios ranging from 0·49 to 0·24 occur in both V. album and V. cruciatum, indicating that in this population translocation heterozygosity may be maintained by a system of balanced lethals similar to those in Onagraceae. Expand
Karyotype evolution in Australian ants
TLDR
The data provide little support for the ancestral chromosome number in ants having been high with subsequent reduction, but suggest that the ancestral number was either very low with subsequent increase or coincident with the present mode (“modal hypothesis”). Expand
Sex differences in fitness and selection for centric fusions between sex-chromosomes and autosomes.
TLDR
It is shown that a necessary condition for the fusion to be favoured is that there is a selectively maintained sex difference in allele frequencies at the selected locus, and the initial rate of increase of a rare Y-autosome fusion is about three times that of an X-autOSome fusion, with the same parameter values. Expand
Complex hybridity in Isotoma petræa
TLDR
This paper deals with genetic systems found in Isotoma petreea and the closely related I. axillaris Lindl. Expand
TRANSLOCATION HETEROZYGOSITY, GENETIC HETEROZYGOSITY, AND INBREEDING IN CLARKIA SPECIOSA
  • W. Bloom
  • Biology, Medicine
  • Evolution; international journal of organic evolution
  • 1977
TLDR
There is no theoretical reason that translocation heterozygotes must maintain genetic heterozygosity more efficiently than the corresponding homozygotes under conditions of inbreeding, and without additional information it is not certain whether the translocations is actually maintaining adaptive linkage combinations or whether it is correlated with particular genetic combinations perhaps temporarily. Expand
...
1
2
...