Featured Research

from universities, journals, and other organizations

Scientists Deconstruct Cell Division

Date:
February 11, 2009
Source:
Carnegie Institution
Summary:
The last step of the cell cycle is the spectacularly dynamic and complicated mitosis phase, which leads to the duplication of one mother cell into two daughter cells. In mitosis, fibrous structures called spindles form. Scientists have tried for years to unravel the process of spindle assembly. Now, researchers have found that two proteins used in other functions -- dynein and Nudel -- are essential to regulate assembly of the spindle matrix.

This image shows an in vitro assay for the assembly of lamin B containing spindle matrix along microtubules during spindle assembly. Yellow arrows point to the lamin B network assembled along the microtubules.
Credit: Image courtesy Yixian Zheng

The last step of the cell cycle is the brief but spectacularly dynamic and complicated mitosis phase, which leads to the duplication of one mother cell into two daughter cells. In mitosis, the chromosomes condense and the nucleus breaks down. Fibrous structures called spindles form, which then move the chromosomal material toward opposite ends of a cell and help partition other cell contents. If something goes wrong, diseases such as cancer can arise.

Related Articles


Scientists have tried for years to unravel the process of spindle assembly. Now, researchers at Carnegie's Department of Embryology have found that two proteins— dynein and Nudel—involved in other cell-division functions, are essential to regulate assembly of the spindle matrix.

"The mechanisms that cells use during division to partition both chromosomes and regulatory factors into their daughters are widely recognized as among the most fundamental processes in all of biology. During the last several years no one has done more than Yixian Zheng to broaden our understanding of how dividing cells control these critical events," said Allan Spradling, Department of Embryology director.

"To ensure proper cell division, the mother cell needs to separate its genetic materials, the chromosomes, equally, but also partition its cellular content properly into daughter cells," explained co-author Yixan Zheng. "Cell division allows a fertilized egg to develop into multicellular organisms with different types of cells. It also replenishes adult tissues, such as skin and bones. Forming a spindle requires the assembly of a 'skeleton' from tube-like microtubules and the construction of a poorly defined scaffold called a spindle matrix."

In 2006, Zheng and colleagues discovered that a protein found in the nucleus during the interphase of the cell division cycle, called lamin-B, is a structural component of the spindle matrix (Science 31 March 2006, 311: 1887-1893). Based on this finding, she and colleagues have now isolated the spindle matrix. Interestingly, both dynein and Nudel are components of the spindle matrix. Nudel binds to lamin-B and brings it to microtubules where both Nudel and dynein then help the lamin-B assemble into the spindle matrix. The lamin-B-containing spindle matrix, in turn, works with microtubules to orchestrate spindle assembly and cell division.

"Isolating the spindle matrix and identifying its components has also allowed us to show that the matrix contains not only factors important for spindle assembly, but also proteins essential for cell fate choices," remarked Zheng. "We believe that by understanding how the spindle matrix is assembled in mitosis, it will be possible to understand how, after mitosis, two daughters can chose to become the same or different cell types—a decision that cells need to make both during the development of an organism and during the maintenance of adult tissues."

The research is published on line in the February 8 Nature Cell Biology.


Story Source:

The above story is based on materials provided by Carnegie Institution. Note: Materials may be edited for content and length.


Cite This Page:

Carnegie Institution. "Scientists Deconstruct Cell Division." ScienceDaily. ScienceDaily, 11 February 2009. <www.sciencedaily.com/releases/2009/02/090208133145.htm>.
Carnegie Institution. (2009, February 11). Scientists Deconstruct Cell Division. ScienceDaily. Retrieved March 5, 2015 from www.sciencedaily.com/releases/2009/02/090208133145.htm
Carnegie Institution. "Scientists Deconstruct Cell Division." ScienceDaily. www.sciencedaily.com/releases/2009/02/090208133145.htm (accessed March 5, 2015).

Share This


More From ScienceDaily



More Plants & Animals News

Thursday, March 5, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Praying Mantis Looks Long Before It Leaps

Praying Mantis Looks Long Before It Leaps

Reuters - Innovations Video Online (Mar. 5, 2015) — Slowed-down footage of the leaps of praying mantises show the insect&apos;s extraordinary precision, say researchers. Video provided by Reuters
Powered by NewsLook.com
Octopus Grabs Camera and Turns It Around On Photographer

Octopus Grabs Camera and Turns It Around On Photographer

Buzz60 (Mar. 5, 2015) — A photographer got the shot of a lifetime, or rather an octopus did, when it grabbed the camera and turned it around to take an amazing picture of the photographer. Jen Markham (@jenmarkham) has the story. Video provided by Buzz60
Powered by NewsLook.com
Ringling Bros. Eliminating Elephant Acts

Ringling Bros. Eliminating Elephant Acts

AP (Mar. 5, 2015) — The Ringling Bros. and Barnum & Bailey Circus is ending its iconic elephant acts. The circus&apos; parent company, Feld Entertainment, told the AP exclusively that the acts will be phased out by 2018 over growing public concern about the animals. (March 5) Video provided by AP
Powered by NewsLook.com
Raw: Tourists Visit Rare Grey Whales in Mexico

Raw: Tourists Visit Rare Grey Whales in Mexico

AP (Mar. 4, 2015) — Once nearly extinct, grey whales now migrate in their thousands to Mexico&apos;s Vizcaino reserve in Baja California, in search of warmer waters to mate and give birth. Tourists flock to the reserve to see the whales, measuring up to 49 feet long. (March 4) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins