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Sex Chromosomes

All articles tagged with #sex chromosomes

science1 year ago

Ancient Origins: Octopuses Possess Oldest Sex Chromosomes

Researchers have discovered that octopuses may have the oldest sex chromosomes in the animal kingdom, with evidence of a ZW sex-determination system found in their genome. This unique chromosome pair, present in the California two-spot octopus, suggests an ancient origin dating back between 455 and 248 million years ago. The discovery challenges previous assumptions about sex determination in animals and highlights the need for further research into the evolution of sex chromosomes.

via ScienceAlert|
#cephalopods#evolution#genetics
science1 year ago

"Unveiling the Ancient Origins of Octopus Sex Chromosomes 380 Million Years Ago"

The oldest known sex chromosome in animals has been discovered in octopus and squid, dating back between 248 million and 455 million years ago. This suggests that these creatures may have been among the first animals to determine their sex via genetic blueprint rather than environmental cues. The discovery sheds light on the evolution of sex determination and challenges previous assumptions about how sex chromosomes emerged.

via Livescience.com|
#cephalopods#evolution#genetics
science2 years ago

"Discovery of Prehistoric Individual with Absent X Chromosomes from Ancient DNA Analysis"

Researchers have identified the earliest known cases of two genetic disorders, Turner syndrome and Jacob's syndrome, in prehistoric individuals using a new technique to measure the number of chromosomes in ancient DNA. The study also revealed three people with Klinefelter syndrome and an infant with Down syndrome from different time periods. This method could provide insights into how perceptions of gender identity have evolved over time and may be applied to analyze incomplete ancient DNA in archaeological remains.

via IFLScience|
#ancient-dna#aneuploidy#genetic-disorders
genetics-and-archaeology2 years ago

"Identification of Turner Syndrome in Ancient Genomes"

A new computational method has been developed to identify chromosomal aneuploidies, including sex chromosome karyotypes and autosomal aneuploidies, in ancient genomes. The method was applied to ancient British data, revealing the oldest known instance of mosaic Turner syndrome, individuals with Klinefelter syndrome, and an individual with 47,XYY syndrome, providing insights into the historical prevalence of these conditions. The study sheds light on the societal treatment of individuals with aneuploidies in ancient societies and highlights the potential for exploring past gender variability and societal perceptions of individuals with disorders of sex development.

via Nature.com|
#ancient-genomes#chromosomal-aneuploidy#genetics-and-archaeology
science2 years ago

The Hidden Powers of Sex Chromosomes Revealed by Study

A new study reveals that sex chromosomes, specifically the X and Y chromosomes, have a broader impact on gene regulation throughout the body than previously thought. Genes expressed from the X and Y chromosomes influence cells beyond the reproductive system by affecting the expression of thousands of genes found on other chromosomes. The gene pair ZFX and ZFY, found on the X and Y chromosomes respectively, play a significant role in this regulatory behavior. These findings suggest that sex chromosomes contribute widely to functions beyond those related to sex characteristics and may help explain the differences between male and female cells. The study also challenges the traditional understanding of sex chromosomes, highlighting the importance of the inactive X chromosome and the Y chromosome in gene regulation.

via Phys.org|
#cell-biology#gene-regulation#human-genetics