Meiosis News and Research

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Multicellular eukaryotes and single-celled sex cells reproduce by a process called meiosis. In this process, the number of chromosomes in a mother cell is halved to produce gametes, cells that fuse with other cells. This happens in plants, animals, and fungi. German biologist, Oscar Hertwig first discovered meiosis in sea urchin eggs in 1876.

New research links mutations in TEX11 gene to some cases of male infertility

In the most severe form of male infertility, men do not make any measurable levels of sperm. This condition, called azoospermia, affects approximately 1 percent of the male population and is responsible for about a sixth of cases of male infertility.

2 Jul 2015

Einstein researchers find possible clue to why older mothers have babies born with Down syndrome

Researchers at Albert Einstein College of Medicine of Yeshiva University have found a possible clue to why older mothers face a higher risk for having babies born with conditions such as Down syndrome that are characterized by abnormal chromosome numbers.

19 Feb 2015

Reproductive cell division has mechanical safeguard against chromosome sorting errors

Reproductive cell division has evolved a simple, mechanical solution to avoid chromosome sorting errors, researchers report in the Sept. 11 Science Express.

17 Sep 2014

Fragile Y hypothesis explains the factors behind chromosome loss

A UT Arlington research team says their study of genetic information from more than 4,000 beetle species has yielded a new theory about why some species lose their Y chromosome and others, such as humans, hang on to it.

18 Jun 2014

Research breakthrough: Human skin cells becomes embryonic stem cells

Scientists at Oregon Health & Science University and the Oregon National Primate Research Center have successfully reprogrammed human skin cells to become embryonic stem cells capable of transforming into any other cell type in the body.

16 May 2013

New mechanism that plays important role in meiosis identified

The Research Group headed by molecular biologist Andrea Pichler from the Max Planck Institute of Immunobiology and Epigenetics in Freiburg has made an important discovery in meiosis research.

3 May 2013

Pachytene piRNAs play an essential role in protecting post-meiotic germ cells

Passing one's genes on to the next generation is a mark of evolutionary success. So it makes sense that the body would work to ensure that the genes the next generation inherits are exact replicas of the originals.

16 Nov 2012

UMass Amherst biophysicist receives 2013 Margaret Oakley Dayhoff Award

University of Massachusetts Amherst biophysicist Jenny Ross has won one of the top national honors in her field, the 2013 Margaret Oakley Dayhoff Award, from the Biophysical Society of Rockville, Md. It is given to a woman who has achieved prominence for "substantial contributions to science," while showing very high promise for ideas and leadership in the early stages of her biophysical research career.

3 Oct 2012

Research focuses on evolution of sex and gamete function

The propagation of every animal on the planet is the result of sexual activity between males and females of a given species. But how did things get this way? Why two sexes instead of one? Why are sperm necessary for reproduction and how did they evolve? These as-yet-unresolved issues fascinate Timothy Karr, a developmental geneticist and evolutionary biologist at Arizona State University's Biodesign Institute.

13 Aug 2012

FANCM gene plays key role in recombination of genetic information during inheritance

Scientists of KIT and the University of Birmingham have identified relevant new functions of a gene that plays a crucial role in Fanconi anemia, a life-threatening disease. The FANCM gene is known to be important for the stability of the genome.

30 Apr 2012

Missing tool helps sperm and eggs develop exactly 23 chromosomes each

Researchers at the University of California, Davis have discovered a key tool that helps sperm and eggs develop exactly 23 chromosomes each. The work, which could lead to insights into fertility, spontaneous miscarriages, cancer and developmental disorders, is published April 13 in the journal Cell.

16 Apr 2012

Study examines mRNA transcripts in the sperm of fruitflies and humans

It had long been assumed that the human sperm cell's mission in life ended once it had transferred its freight of parental DNA to the egg. More recently however, other components of sperm have been implicated in fertilization, and perhaps even in subsequent embryonic development.

1 Mar 2012

MGH scientists isolate OSCs from ovaries of reproductive age women

For the first time, Massachusetts General Hospital (MGH) researchers have isolated egg-producing stem cells from the ovaries of reproductive age women and shown these cells can produce what appear to be normal egg cells or oocytes.

27 Feb 2012

Researchers identify unusual genomic architecture linked with very severe forms of disease

When cells divide normally, DNA gets copied perfectly and distributed among the daughter cells with an even hand. Occasionally though, DNA breaks during division and is rearranged, resulting in duplications or deletions of important parts of the blueprint.

3 Oct 2011

Researchers analyse effects of BPA in an in-vitro culture of ovaries

Researchers at Universitat Aut-noma de Barcelona, in collaboration with the Vall d'Hebron Hospital Fetal Tissue Bank, the Department of Gynaecology and the Research Unit of Paediatric Endocrinology, analysed the effects of Bisphenol A (BPA), a polymer widely used to manufacture plastics, in an in vitro culture of ovaries.

22 Sep 2011

New strategy may combat age-associated infertility and birth defects

A strategy that has been shown to reduce age-related health problems in several animal studies may also combat a major cause of age-associated infertility and birth defects.

8 Jul 2011

New insight into oocyte chromosome abnormalities

Ovarian stimulation undertaken by women of advanced maternal age receiving fertility treatment may be disrupting the normal pattern of meiosis - a critical process of chromosome duplication followed by two specialised cell divisions in the production of oocytes and sperm - and leading to abnormalities of chromosome copy numbers that result in IVF failure, pregnancy loss or, more rarely, the birth of affected children with conditions such as Down's syndrome, which is caused by the inheritance of three copies of chromosome 21.

4 Jul 2011

New approaches for controlling sleeping sickness caused by trypanosomes

The research could eventually lead to new approaches for controlling sleeping sickness in humans and wasting diseases in livestock which are caused by trypanosomes carried by the bloodsucking tsetse fly.

18 Feb 2011

Professor Puchta receives ERC's Advanced Researcher Grant

Tomatoes that resist pests and extreme weather while still tasting like tomatoes are among Professor Holger Puchtas long-term research goals. The molecular biologist develops techniques that will allow him to control inheritance in plants to selectively improve the properties of different species through nature's existing gene pool. For his fundamental research, Puchta now is awarded an Advanced Researcher Grant by the European Research Council.

10 Jan 2011

New insight into infertility in older women

Scientists now are closer to understanding why older women become less fertile, suffer a miscarriage or have a baby with Down's syndrome. This could be ground breaking in infertility treatment in the older women in their late 30s and early 40s.

3 Sep 2010