Navigation Links
Stinging came before seeing
Date:3/5/2012

New research from the University of California shows how the ability to detect light could have evolved before anything like an eye.

As published today (March 5) in the journal BMC Biology, the research is based on the stinging mechanism in the tiny, brainless and eyeless freshwater polyp Hydra magnipapillata. Part of a group of animals called cnidarians that includes sea anemones, corals and jellyfish, a hydra is essentially a mouth surrounded by tentacles armed with stinging cells, or cnidocytes.

The researchers David Plachetzki, now a postdoctoral researcher at UC Davis, working with undergraduate Caitlin Fong and Professor Todd Oakley in the Department of Ecology, Evolution and Marine Biology at UC Santa Barbara discovered a simple nervous system linking the stinging cells and nerve cells that detect light using a process similar to the human eye's.

The nerve cells express a set of genes including opsin, a light-sensitive pigment; cyclic nucleotide gated ion channels; and arrestin. These components are basically the same as those in the light-detecting pathway in animals with eyes, including people.

The hydra fire their stingers less in bright than in dim light, the researchers found. When they blocked one of the pathway's components, the hydra acted as if they were in dim light and fired their stingers more.

Most of the hydra's cnidarian relatives lack eyes. But all cnidarians have cnidocyte stinging cells.

"This capacity for stinging cell regulation by light-sensitive neurons could have predated the evolution of eyes in cnidarians," Plachetzki said. Future work will be aimed at how these findings relate to the evolution of eyes in other groups of animals.


'/>"/>

Contact: Andy Fell
ahfell@ucdavis.edu
530-752-4533
University of California - Davis
Source:Eurekalert  

Page: 1

Related biology news :

1. European Neandertals were on the verge of extinction even before the arrival of modern humans
2. Malaria parasite goes bananas before sex: New study
3. 3-D laser map shows earthquake zone before and after
4. MU researchers photoacoustic device finds cancer cells before they become tumors
5. Before sounding an alarm, chimps consider their audience
6. Plasma treatment zaps viruses before they can attack cells
7. Exposure to chemical BPA before birth linked to behavioral, emotional difficulties in girls
8. Exercise before and during early pregnancy increases two beneficial proteins for mothers-to-be
9. Moms who eat high-fat diet before, during pregnancy program babies to be fat, at risk
10. Chronic pain: Watch out before accepting diagnosis and treatment
11. Alzheimers risk gene disrupts brains wiring 50 years before disease hits
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Stinging came before seeing
(Date:6/21/2016)... VANCOUVER, British Columbia , June 21, 2016 ... been appointed to the new role of principal ... has been named the director of customer development. ... , NuData,s chief technical officer. The moves reflect ... development teams in response to high customer demand ...
(Date:6/9/2016)... , June 9, 2016 ... Police deploy Teleste,s video security solution to ensure the safety ... France during the major tournament Teleste, ... communications systems and services, announced today that its video security ... to back up public safety across the country. ...
(Date:6/2/2016)... , June 2, 2016 Perimeter ... Platforms, Unmanned Systems, Physical Infrastructure, Support & Other Service  ... visiongain offers comprehensive analysis of the global ... market will generate revenues of $17.98 billion in 2016. ... DVTEL Inc, a leader in software and hardware technologies ...
Breaking Biology News(10 mins):
(Date:6/24/2016)... June 24, 2016 Epic Sciences unveiled ... cancers susceptible to PARP inhibitors by targeting homologous ... (CTCs). The new test has already been incorporated ... multiple cancer types. Over 230 clinical ... response pathways, including PARP, ATM, ATR, DNA-PK and ...
(Date:6/23/2016)... June 23, 2016   Boston Biomedical , ... compounds designed to target cancer stemness pathways, announced ... granted Orphan Drug Designation from the U.S. Food ... gastric cancer, including gastroesophageal junction (GEJ) cancer. Napabucasin ... to inhibit cancer stemness pathways by targeting STAT3, ...
(Date:6/23/2016)...  The Prostate Cancer Foundation (PCF) is pleased to announce 24 ... for prostate cancer. Members of the Class of 2016 were selected from a ... Read More About the Class of 2016 PCF Young Investigators ... ... ...
(Date:6/23/2016)... ... ... In a new case report published today in STEM CELLS Translational Medicine, doctors ... being treated for breast cancer benefitted from an injection of stem cells derived from ... frequent side effect of cancer treatment. , Lymphedema refers to the swelling ...
Breaking Biology Technology: