Tag

Fertilization

All articles tagged with #fertilization

science21 days ago•7 min saved

Sperm Rowers Unveiled: Cooperative Teams Are Widespread Across Arthropods

A new Nature Communications study from Syracuse University and collaborators shows that sperm often cooperate in groups (sperm conjugation) across arthropods, a pattern tracing back about 600 million years and including the ancestor of insects. The researchers mapped sperm forms on an evolutionary tree, revealing repeated gains and losses of conjugation and highlighting sperm-associated material (SAM) that helps bind sperm into clusters and may have driven the origin of this cooperation. Inside the female tract, grouping could boost movement and deliver key molecules, though observing sperm in vivo remains challenging. The work suggests considering collective sperm behavior in fertility research and notes potential pest-control applications, such as disrupting SAM in invasive lanternflies.

via SciTechDaily|

#arthropods #evolution #fertilization

science6 months ago•4 min saved

Sperm Lose Direction in Microgravity, Raising Spaceflight Reproduction Concerns

Researchers used a 3D clinostat to simulate microgravity and tested human, pig, and mouse sperm in a channel resembling the female reproductive tract; they found a significant drop in the number of sperm reaching the egg under microgravity, not due to motor changes but impaired direction sensing; fertilization dropped about 30% after four hours of exposure, with longer exposure causing delays and fewer embryos; progesterone could still guide sperm, indicating chemotaxis remains important; the findings, published in Communications Biology, imply spaceflight could affect reproductive outcomes in humans and livestock, highlighting the need for further research.

via ScienceAlert|

#fertilization #microgravity #reproduction

science1 year ago•4 min saved

Scientists Create Human Eggs from Skin Cells in Breakthrough

Scientists have successfully created fertilizable egg-like cells using DNA from human skin cells through a novel technique called mitomeiosis, marking a significant step in infertility research, though clinical applications are still at least 10-15 years away and face ethical and technical challenges.

via ScienceAlert|

#dna-from-skin-cells #egg-cells #fertilization

health1 year ago•4 min saved

Three-parent DNA technique prevents inherited diseases in babies

Researchers in Britain have successfully used a technique involving DNA from three people to help prevent inherited mitochondrial diseases, resulting in the birth of eight healthy babies, marking a significant milestone in reproductive medicine and genetic disease prevention.

via NBC News|

#dna #fertilization #health

science1 year ago•8 min saved

Debunking the Myth of Racing Sperm in Fertility

The article debunks the myth of 'racing sperm' by explaining that eggs, not sperm, are the active decision-makers in fertilization, selectively attracting or rejecting sperm based on biological cues, challenging long-held cultural narratives about reproduction.

via Live Science|

#egg-choice #female-body #fertilization

science1 year ago•10 min saved

Unraveling the Mysteries of Sperm

Scientists are still uncovering the mysteries of sperm, including how they swim, navigate, and interact with the female reproductive system. Advances in technology are revealing new insights into sperm structure, movement, and the influence of female evolution on sperm diversity, but many aspects remain poorly understood, highlighting sperm as one of the most complex and rapidly evolving cells.

via BBC|

#biology #fertilization #reproduction

health2 years ago•1 min saved

"The Science Behind Conjoined Twins: Exploring Their Unique Lives and Challenges"

The recent deaths of the oldest living conjoined twins and the marriage of another pair have sparked interest in the causes of this rare phenomenon. Conjoined twins are born physically connected and may share organs or body parts. The development of conjoined twins in the womb is still not fully understood, with two main theories suggesting that a single fertilized egg does not fully split or that two fertilized eggs fuse together. The occurrence of conjoined twins is estimated to be rare, with the cause remaining unclear.

via WAVY.com|

#conjoined-twins #development #fertilization

science-and-research2 years ago•2 min saved

"Unveiling the Intriguing Dance of Fertilization: Simulated Insights"

Researchers from ETH Zurich and Ludwig Maximilian University of Munich have used simulations to reveal the intricate details of the protein complex JUNO-IZUMO1, which plays a crucial role in the fertilization process. The simulations showed that the complex is initially stabilized by short-lived and weak non-covalent interactions, and that the presence of zinc ions can bend IZUMO1 into a shape that hinders its binding to JUNO, potentially preventing other sperm from entering the egg. These findings provide new insights into the first moments of fertilization and could have implications for contraceptives and infertility.

via ScienceAlert|

#egg #fertilization #protein-interactions

science3 years ago•3 min saved

Unveiling the Mystery: The Maternal Inheritance of Mitochondrial DNA Explained

New research published in the journal Nature Genetics sheds light on why mitochondrial DNA (mtDNA) is exclusively inherited from the mother. While it was previously believed that paternal mtDNA was eliminated during fertilization, the study found that mature sperm lack intact mtDNA and a protein essential for mtDNA maintenance. The researchers speculate that this may be due to the high energy usage of sperm during fertilization, which could lead to the accumulation of mtDNA mutations. In contrast, developing eggs primarily draw energy from surrounding cells, maintaining relatively pristine mtDNA. Understanding the role of mtDNA in sperm maturation and fertilization could have implications for treating infertility disorders and improving assisted reproductive technologies.

via News-Medical.Net|

#energy-production #fertilization #maternal-inheritance

science3 years ago•3 min saved

Mitochondrial DNA missing in mature sperm, study reveals

A new study has found that mature sperm lack intact mitochondrial DNA (mtDNA), which is exclusively passed down by the mother. While sperm cells do carry a small number of mitochondria, they do not contain mtDNA. This discovery has important implications for human fertility and germ cell therapy, as understanding the role of mtDNA during sperm maturation and fertilization could potentially lead to advancements in treating infertility disorders and increasing the efficiency of assisted reproductive technologies.

via Phys.org|

#fertilization #genetic-code #infertility