Navigation Links
Insects that produce males from unfertilized eggs reveal a surprising cellular feat

among the millions of other species there must be cellular mechanisms we haven't even imagined."

Centrosomes help orchestrate cell division, building an apparatus of microtubules called the mitotic spindle, which pulls apart the duplicated chromosomes so that each of the two daughter cells gets a complete set of chromosomes. The centrosome contains about a hundred different proteins, including the main protein for making microtubules, called gamma tubulin.

The UCSC researchers studied the development of centrosomes in the eggs of two parasitic wasps (Nasonia vitripennis and Muscidifurax uniraptor). Using fluorescently labeled antibodies that recognize and bind to gamma tubulin and other centrosomal proteins, they demonstrated the presence of these proteins in accessory nuclei and showed that the accessory nuclei appear to give rise to centrosomes.

Accessory nuclei bud off from the membrane of the nucleus, the cellular structure that contains the chromosomes. By the time the egg is fully developed, it contains several hundred accessory nuclei that look much like the nucleus except that they don't contain chromosomes. Late in the development of the egg cell, the accessory nuclei disintegrate and centrosomes appear in the same locations in the cell.

"Right before the egg is laid, the membranes of the accessory nuclei break down, and at the same time the centrosomes begin to form," Ferree said.

One of the most striking aspects of this mechanism is the large number of accessory nuclei and centrosomes that form in the developing eggs of these Hymenopteran insects.

"You only need two centrosomes, and they make hundreds of them. So they go through a lot of work to make a male," Sullivan said. "A lot of energy goes into making these centrosomes, and if the egg gets fertilized they don't use them--the centrosome from the sperm is used preferentially."

Centrosomes remain somewhat mysterious structures, Ferree said, bu
'"/>

Source:University of California - Santa Cruz


Page: 1 2 3

Related biology news :

1. Insects, viruses could hold key for better human teamwork in disasters
2. Insects develop resistance to engineered crops
3. Study Unlocks Insects?Secret for Love in the Dark
4. Insects and mammals share common fat-building pathway, study suggests
5. Inexpensive, mass-produced genes core of synthetic biology advances at UH
6. Researchers devise way to mass-produce embryonic stem cells
7. Stem cells from brain transformed to produce insulin at Stanford
8. Anammox bacteria produce nitrogen gas in oceans snackbar
9. Proteomics brings researchers closer to understanding microbes that produce acid mine drainage
10. Organic farms produce same yields as conventional farms
11. Pollution-eating bacteria produce electricity
Post Your Comments:
(Date:7/10/2014)... Fe, Albuquerque, and other major cities in New Mexico, ... treated municipal wastewater rather than precious potable water supplies. ... 40% of all golf courses receive treated effluent. Reusing ... , Additionally, golf courses and homeowners alike fertilize their ... fertilizer is nitrate. A New Mexico State University turfgrass ...
(Date:7/10/2014)... 2014  Pomerantz LLP has filed a class ... the "Company")(NYSE-MKT: PVCT) and certain of its officers.  ... Court, Middle District of Tennessee ... class consisting of all persons or entities who ... 17, 2013 and May 22, 2014, both dates ...
(Date:7/10/2014)... , July 1, 2014 Smart ... way for convenience and improved security: NXT-ID, Inc. (OTCBB: NXTD), ... GOOG ), Apple Inc. (NASDAQ: AAPL ... Corporation (NYSE: MA) NXT-ID, Inc., (OTCQB: NXTD) a biometric ... to announce that the second series of 30 second spots ...
Breaking Biology News(10 mins):'Tailored' water -- the latest in lawn care 2SHAREHOLDER ALERT: Pomerantz Law Firm Announces the Filing of a Class Action against Provectus Biopharmaceuticals, Inc. and Certain Officers - PVCT 2SHAREHOLDER ALERT: Pomerantz Law Firm Announces the Filing of a Class Action against Provectus Biopharmaceuticals, Inc. and Certain Officers - PVCT 3Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 2Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 3Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 4Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 5
... Twenty-five new articles have been posted online ahead of print ... covers a gamut of topics, from microbial mats to super-eruptions; ... articles go through a rigorous peer-review process prior to print. ... for the seventh year in a row, according to a ...
... in the journal Science , Professor Frank Caruso ... The University of Melbourne and his team have developed ... a new-generation particle system with engineered properties. ... of therapeutics in the areas of cancer, vaccines, cardiovascular ...
... 11, 2013 /PRNewswire-iReach/ -- Ida Tin , CEO and ... that, while fertility is a constant theme for forty years ... effective high–tech tools to help women really understand their fertility ... http://photos.prnewswire.com/prnh/20130711/CG45268 ) Available today in the ...
Cached Biology News:Geology tracks eruptions, earthquakes, erosion, extinctions & more 2Geology tracks eruptions, earthquakes, erosion, extinctions & more 3Geology tracks eruptions, earthquakes, erosion, extinctions & more 4Geology tracks eruptions, earthquakes, erosion, extinctions & more 5Geology tracks eruptions, earthquakes, erosion, extinctions & more 6Geology tracks eruptions, earthquakes, erosion, extinctions & more 7Geology tracks eruptions, earthquakes, erosion, extinctions & more 8Geology tracks eruptions, earthquakes, erosion, extinctions & more 9Geology tracks eruptions, earthquakes, erosion, extinctions & more 10Geology tracks eruptions, earthquakes, erosion, extinctions & more 11Geology tracks eruptions, earthquakes, erosion, extinctions & more 12Geology tracks eruptions, earthquakes, erosion, extinctions & more 13Geology tracks eruptions, earthquakes, erosion, extinctions & more 14Geology tracks eruptions, earthquakes, erosion, extinctions & more 15Geology tracks eruptions, earthquakes, erosion, extinctions & more 16Geology tracks eruptions, earthquakes, erosion, extinctions & more 17Geology tracks eruptions, earthquakes, erosion, extinctions & more 18Geology tracks eruptions, earthquakes, erosion, extinctions & more 19Geology tracks eruptions, earthquakes, erosion, extinctions & more 20Geology tracks eruptions, earthquakes, erosion, extinctions & more 21Clue, a Berlin Startup Founded By a Woman, Launches An Intelligent Tracking App That Decodes a Woman's Fertility Cycle 2Clue, a Berlin Startup Founded By a Woman, Launches An Intelligent Tracking App That Decodes a Woman's Fertility Cycle 3
(Date:7/11/2014)... , July 11, 2014 ... to announce the appointment of John P. Donoghue ... Biotech   in  Geneva . The ... Campus Biotech in Geneva , has ... recognised neuroscientists. John P. Donoghue , founder of ...
(Date:7/11/2014)... -- Researchers have pioneered a revolutionary new way to ... Virtual Finger, allows scientists to move through digital ... using the flat surface of their computer screens. ... orders of magnitude more efficient, saving time, money ... areas of experimental biology. The software and its ...
(Date:7/10/2014)... 10, 2014 Women in the ... to an additional family planning option. Sayana® Press ... at all levels of the health system and ... a widely used contraceptive—Pfizer’s Depo-Provera® (depot medroxyprogesterone acetate)—with ... is the first of four African countries expected ...
(Date:7/10/2014)... 2014 Deep Knowledge Ventures last ... on ‘Commercialising Longevity Research’ and welcomed a host ... London Bioscience Innovation Center for the event, organised ... Analytics Ltd. The meeting highlighted the need for ... for age-related disease, as well as the crucial ...
Breaking Biology Technology:John P. Donoghue is Taking the Lead at the Wyss Center and is Appointed Professor at EPFL and University of Geneva 2John P. Donoghue is Taking the Lead at the Wyss Center and is Appointed Professor at EPFL and University of Geneva 3Virtual Finger Enables Scientists To Navigate And Analyze 3D Images Of Complex Biological Structures 2Virtual Finger Enables Scientists To Navigate And Analyze 3D Images Of Complex Biological Structures 3Injectable Contraceptive Launched in Burkina Faso to Expand Choice and Address Unmet Need 2Injectable Contraceptive Launched in Burkina Faso to Expand Choice and Address Unmet Need 3Injectable Contraceptive Launched in Burkina Faso to Expand Choice and Address Unmet Need 4Injectable Contraceptive Launched in Burkina Faso to Expand Choice and Address Unmet Need 5Injectable Contraceptive Launched in Burkina Faso to Expand Choice and Address Unmet Need 6DKV Sponsors Forum on Commercialising Longevity Research; Brings Together Scientists, Investors, Entrepreneurs and Celebrities 2DKV Sponsors Forum on Commercialising Longevity Research; Brings Together Scientists, Investors, Entrepreneurs and Celebrities 3DKV Sponsors Forum on Commercialising Longevity Research; Brings Together Scientists, Investors, Entrepreneurs and Celebrities 4DKV Sponsors Forum on Commercialising Longevity Research; Brings Together Scientists, Investors, Entrepreneurs and Celebrities 5DKV Sponsors Forum on Commercialising Longevity Research; Brings Together Scientists, Investors, Entrepreneurs and Celebrities 6
... March 10 Cepheid (Nasdaq:,CPHD) will present at ... 18 at 10:15 a.m. ET at The Boston ... Executive Officer, will provide a corporate overview., ... be,accessed on Cepheid,s Web site at http://www.cepheid.com ...
... (Amex: ANX ) announced today that complete ... ANX-530 (vinorelbine,emulsion) will be published in the 2008 ... in connection with ASCO,s 2008 Annual Meeting,which takes ... Chicago, IL. The abstract,entitled "Tolerability and incidence of ...
... Cell Therapeutics, Inc.,(CTI) (Nasdaq: CTIC ; MTAX) ... Conference on Tuesday, March 18th at 9:00 AM in ... The presentation will also be webcast live with slides, ... be accessed at, http://www.cticseattle.com ., WBBA Invest ...
Cached Biology Technology:Cepheid to Present at Cowen and Company's 28th Annual Healthcare Conference 2Complete ANX-530 Safety Data to be Published in the 2008 Proceedings of the American Society of Clinical Oncology 2Complete ANX-530 Safety Data to be Published in the 2008 Proceedings of the American Society of Clinical Oncology 3
HLA II DG+DR+DP Monoclonal Antibody, Purified, Unconjugated, Clone: IQU9 This antibody is specific for the monomorphic determinant of the HLA Class II beta chains of the human MHC (28 kDa)....
Anti-gp120/160(SIV/mac239) Immunogen: gp120(SIV/mac239) protein (Genebank accession #M33262)...
Phospho-MEF2A(Thr312)...
Tube-O-DIALYZER Floats, small....
Biology Products: