An insecure role for Securin in chromosome segregation

A critical aspect of cell division, or mitosis, is that the progeny cells must receive the full complement of chromosomes. Failure of this mechanism, which sometimes happens in cancer cells, leads to rampant chromosome loss and mutations that encourage proliferation and increase instability. Understanding how normal cells unerringly transmit a full chromosome set to their daughters has long been an important part of the fight against cancer.

In a new study published online in the open-access journal PLoS Biology, Katrin Pfleghaar, Michael Speicher, and colleagues reinvestigate the cell's ability to undergo mitosis when missing a key protein, securin. Securin is a chaperone protein that regulates an enzyme that initiates the segregation of the sister chromatids during mitosis. They found that, contrary to previous reports, human cells devoid of the securin protein, which initially suffer widespread chromosome losses, can actually recover after a certain time has passed. In fact, cells with abnormal mitoses and chromosome counts became rarer until, after a few weeks, the cells appeared indistinguishable from their relatives with an intact securin gene. Pfleghaar and her colleagues speculate that securin normally plays an important role in mitoses, but that in its absence, cells tap into compensatory mechanisms to restore proper chromosome segregation.

The implications for cancer treatment are potentially great, as mathematical models of cancer growth do not usually include the possibility that cell populations might recover from chromosomal instability. In addition, such recovery from securin loss, like that seen here, might interfere with therapies that aim to kill cancer cells by exacerbating their chromosome losses.


Contact: Paul Ocampo
Public Library of Science

Page: 1

Related biology news :

1. Biologists at Tufts University discover 1 reason why chromosomes break, often leading to cancer
2. Double identities lie behind chromosome disorders
3. St. Jude study yields secrets of chromosome movement
4. Physicist cracks womens random but always lucky choice of X chromosome
5. Researchers shed light on shrinking of chromosomes
6. Researchers attach genes to minichromosomes in maize
7. Baumann Lab defines proteins that distinguish chromosome ends from DNA double-strand breaks
8. New technique will produce a better chromosome map
9. Short chromosomes put cancer cells in forced rest
10. Shortening chromosomes cause for earlier cancer onset in families with rare syndrome
11. The pull of bacterial chromosome segregation

Post Your Comments:

(Date:4/4/2017)... YORK , April 4, 2017   EyeLock ... today announced that the United States Patent and Trademark ... patent broadly covers the linking of an iris image ... same transaction) and represents the company,s 45 th ... latest patent is very timely given the multi-modal biometric ...
(Date:3/30/2017)... Trends, opportunities and forecast in this market ... (fingerprint, AFIS, iris recognition, facial recognition, hand geometry, vein ... use industry (government and law enforcement, commercial and retail, ... others), and by region ( North America ... Pacific , and the Rest of the World) ...
(Date:3/24/2017)... MILAN , March 24, 2017 The Controller ... Deputy Controller Mr. Abdulla Algeen have received the prestigious international ... Continue Reading ... ... small picture) and Deputy Controller Abdulla Algeen (small picture on the right) ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... (PRWEB) , ... October 11, 2017 , ... ComplianceOnline’s Medical ... place on 7th and 8th June 2018 in San Francisco, CA. The Summit brings ... well as several distinguished CEOs, board directors and government officials from around the world ...
(Date:10/11/2017)... the Netherlands and LAGUNA HILLS, Calif. ... The Institute of Cancer Research, London ... use MMprofiler™ with SKY92, SkylineDx,s prognostic tool to risk-stratify patients ... trial known as MUK nine . The University of ... trial, which is partly funded by Myeloma UK, and ICR ...
(Date:10/11/2017)... Bay, Florida (PRWEB) , ... October 11, 2017 ... ... and Drug Administration (FDA) has granted orphan drug designation to SBT-100, its novel ... (sdAb) for the treatment of osteosarcoma. SBT-100 is able to cross the cell ...
(Date:10/10/2017)... , ... October 10, 2017 , ... ... Center’s FirstHand program has won a US2020 STEM Mentoring Award. Representatives of the ... for Excellence in Volunteer Experience from US2020. , US2020’s mission is to change ...
Breaking Biology Technology:
Cached News: