Evidence for the presence of sex chromosomes in the Nile tilapia (Oreochromis niloticus) from synaptonemal complex analysis of XX, XY and YY genotypes

Carrasco, L. A. P.; Penman, David J.; Bromage, Niall

doi:10.1016/s0044-8486(98)00488-8

Cited by 79 publications

(56 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…No cytologically distinguishable sex chromosome was observed which is similar to O. niloticus (Majumdar andMcAndrew 1986, Sofy et al 2008). However, it is different from the reports of Carrasco et al (1999) …”

Section: Diploid Chromosome Number (2n) Fundamental Number (Nf) and contrasting

confidence: 80%

Chromosomal Characteristic of Nile Tilapia (<i>Oreochromis niloticus</i>) from Mitotic and Meiotic Cell Division by T-Lymphocyte Cell Culture

et al. 2013

View full text Add to dashboard Cite

Summary Chromosomal characteristics of Nile tilapia (Oreochromis niloticus) from mitotic and meiotic cell division were studied. Blood samples were taken from five male and five female fish. Fish chromosome preparation was conducted by T-lymphocyte cell culture and squash technique from testis. The chromosomes were stained by conventional and Ag-NOR staining techniques. The results showed that the diploid chromosome number of O. niloticus was 2n=44 and the fundamental number (NF) was 58 in both male and female. The types of chromosomes were present as 2 large acrocentric, 2 small submetacentric, 10 small acrocentric, and 30 small telocentric chromosomes. There are no strange size chromosomes related to sex. We also observed distinctive secondary constriction/NORs at the region adjacent to the short arms near telomere of a pair of submetacentric chromosomes.

show abstract

Section: Diploid Chromosome Number (2n) Fundamental Number (Nf) and contrasting

confidence: 80%

Chromosomal Characteristic of Nile Tilapia (<i>Oreochromis niloticus</i>) from Mitotic and Meiotic Cell Division by T-Lymphocyte Cell Culture

et al. 2013

View full text Add to dashboard Cite

show abstract

“…The amount of 5mC immunofluorescence from a specific knob and its corresponding X chromosomal domain was measured, and the ratio was calculated from each pair of measurements. In cichlid fish (Oreochromis niloticus), the terminal portion of the X/Y bivalents show an absence of synapsis (Carrasco et al 1999), which is caused by a delay in chromosome pairing in this region (Griffin et al 2002). Cytological analysis showed no evidence of chromosomal rearrangements associated with this unpaired region (Griffin et al 2002).…”

Section: (D) MI Fish Mapping Of K4-specific 52h15 (Green) and K3-specmentioning

confidence: 94%

DNA methylation and heterochromatinization in the male-specific region of the primitive Y chromosome of papaya

Zhang¹,

Wang²,

et al. 2008

Genome Res.

111

View full text Add to dashboard Cite

Sex chromosomes evolved from autosomes. Recombination suppression in the sex-determining region and accumulation of deleterious mutations lead to degeneration of the Y chromosomes in many species with heteromorphic X/Y chromosomes. However, how the recombination suppressed domain expands from the sex-determining locus to the entire Y chromosome remains elusive. The Y chromosome of papaya (Carica papaya) diverged from the X chromosome approximately 2-3 million years ago and represents one of the most recently emerged Y chromosomes. Here, we report that the male-specific region of the Y chromosome (MSY) spans ∼13% of the papaya Y chromosome. Interestingly, the centromere of the Y chromosome is embedded in the MSY. The centromeric domain within the MSY has accumulated significantly more DNA than the corresponding X chromosomal domain, which leads to abnormal chromosome pairing. We observed four knob-like heterochromatin structures specific to the MSY. Fluorescence in situ hybridization and immunofluorescence assay revealed that the DNA sequences associated with the heterochromatic knobs are highly divergent and heavily methylated compared with the sequences in the corresponding X chromosomal domains. These results suggest that DNA methylation and heterochromatinization play an important role in the early stage of sex chromosome evolution.

show abstract

“…37,40 Another interesting fact is that besides being present in the heterochromatic regions, Rex elements are generally concentrated on the first chromosome pair, which appears entirely marked with such elements. 35 In this species, the first chromosome pair seems to correspond to the sex chromosomes, 41,42 which possibly originated from fusion processes. 43 The determined localization of Rex elements in this chromosome pair could indicate that these TEs might be involved in such chromosome rearrangements.…”

mentioning

confidence: 90%

Transposable elements as a potential source for understanding the fish genome

Ferreira

Porto‐Foresti

Oliveira

et al. 2011

Mobile Genetic Elements

View full text Add to dashboard Cite

Evidence for the presence of sex chromosomes in the Nile tilapia (Oreochromis niloticus) from synaptonemal complex analysis of XX, XY and YY genotypes

Cited by 79 publications

References 25 publications

Chromosomal Characteristic of Nile Tilapia (<i>Oreochromis niloticus</i>) from Mitotic and Meiotic Cell Division by T-Lymphocyte Cell Culture

Chromosomal Characteristic of Nile Tilapia (<i>Oreochromis niloticus</i>) from Mitotic and Meiotic Cell Division by T-Lymphocyte Cell Culture

DNA methylation and heterochromatinization in the male-specific region of the primitive Y chromosome of papaya

Transposable elements as a potential source for understanding the fish genome

Contact Info

Product

Resources

About