Navigation Links
A new male-specific gene in algae unveils an origin of male and female

By studying the genetics of two closely related species of green algae that practice different forms of sexual reproduction, researchers have shed light on one route by which evolution gave rise to reproduction though the joining of distinct sperm and egg cells. The findings, which indicate that a gene underlying a more primitive system of reproduction was likely co-opted during evolution to participate in sex-specific sperm development, are reported by Hisayoshi Nozaki and colleagues at the University of Tokyo, Rikkyo (St. Paul’s) University, and Osaka University. The paper appears in the December 19th issue of the journal Current Biology, published by Cell Press.

The familiar notion of the separate male and female sexes exhibited by animal and plant species is based in part on the anatomically and genetically distinct gametes, sperm and egg, produced by members of each sex. But the evolutionary origin of oogamy—reproduction though joining of distinct sperm and egg cells—is in fact poorly understood. In particular, it has remained unclear how oogamy arose from isogamy, a more simple form of sex in which very similar reproductive cells take on different "mating types" but do not differentiate as distinct sperm and egg. The transition from isogamy to oogamy has apparently occurred multiple times during the evolution of animals, plants, and some algae, but how did such transitions occur"

In their new work, the researchers established a genetic connection between male sexuality of an oogamous multicellular green algae species, Pleodorina starrii, and one of the mating types of its isogamous ancestor, the unicellular alga Clamydomonas reinhardtii.

In C. reinhardtii, isogamous sexual reproduction occurs through "plus" (MT+) and "minus" (MT-) mating types. MT- represents a "dominant sex" because a particular gene, MID ("minus-dominance") of C. reinhardtii is both necessary and sufficient to cause the cells to differentiate as MT- isogametes. How ever, no sex-specific genes related to MID had been identified in closely related oogamous species. The researchers now report that they have successfully identified a version of the MID gene in Pleodorina starrii. This "PlestMID" gene is present only in the male genome, and it encodes a protein localized abundantly in the nuclei of mature sperm. The findings indicate that P. starrii maleness evolved from the dominant sex (MT-) of its isogamous ancestor. This breakthrough in understanding provides an opportunity to address any number of extremely interesting questions regarding evolution of oogamy and the origins of male-female dichotomy.
'"/>

Source:Cell Press


Related biology news :

1. Evidence of 600-million-year old fungi-algae symbiosis discovered in marine fossils
2. Deep sea algae connect ancient climate, carbon dioxide and vegetation
3. The secret life of algae
4. Cellular antennae on algae give clues to how human cells receive signals
5. Detecting microalgae in coastal waters
6. Chemicals in brown algae may protect against skin cancer
7. Florida Tech explores microalgae for biofuel
8. Common algae helps illustrate mammalian brain electrical circuitry
9. Darkness unveils vital metabolic fuel switch between sugar and fat
10. UAB scientists discover the origin of a mysterious physical force
11. An (ecological) origin of species for tropical reef fish

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/28/2016)... and BANGALORE, India , April ... EdgeVerve Systems, a product subsidiary of Infosys (NYSE: ... today announced a global partnership that will provide ... to use mobile banking and payment services.      ... a key innovation area for financial services, but it also ...
(Date:4/26/2016)... DUBLIN , April 27, 2016 ... of the  "Global Multi-modal Biometrics Market 2016-2020"  report ... ) , The analysts forecast ... a CAGR of 15.49% during the period 2016-2020.  ... a number of sectors such as the healthcare, ...
(Date:4/15/2016)... DUBLIN , April 15, 2016 ... of the,  "Global Gait Biometrics Market 2016-2020,"  report ... http://photos.prnewswire.com/prnh/20160330/349511LOGO ) , ,The global gait ... CAGR of 13.98% during the period 2016-2020. ... movement angles, which can be used to compute ...
Breaking Biology News(10 mins):
(Date:5/26/2016)... ... May 26, 2016 , ... FireflySci has been ... leading laboratories all over the globe. Their cute firefly logo has been spreading ... cuvettes, FireflySci makes spectrophotometer calibration standards that never require recalibration. These revolutionary ...
(Date:5/25/2016)... ... May 25, 2016 , ... Thailand’s Board of Investment’s New ... San Francisco. Located at booth number 7301, representatives from the Thai Government, research ... the Thai biotechnology and life sciences sector. , Deputy Secretary General of ...
(Date:5/25/2016)... ... 25, 2016 , ... Founder of the Fitzmaurice Hand Institute ... surgery of the hand by the National Board of Physicians and Surgeons, as ... beyond in his pursuit of providing the most comprehensive, effective treatment for his ...
(Date:5/25/2016)... ... ... Scientists at the University of Athens say they have evidence that the ... research that could lead to one good one. Surviving Mesothelioma has just posted an ... The team evaluated 98 mesothelioma patients who got a second kind of ...
Breaking Biology Technology: