'Hail Mary' mechanism can rescue cells with severely damaged chromosomes

June 5, 2017, University of California - Santa Cruz
In this dividing cell, chromosome fragments (red) remain in the middle of the green spindle structure, while the rest of the chromosomes have segregated to the two poles. Fragments that fail to segregate to daughter nuclei form micronuclei, resulting in an unstable genome and cancer. Credit: Travis Karg

The DNA vital to the life of a cell is packaged in chromosomes, and a variety of checkpoints, repair mechanisms, and other cellular safeguards exist to maintain the integrity of the chromosomes during cell growth and division. Those safeguards can fail, however, and a cell may find itself trying to divide into two daughter cells with a loose chromosomal fragment drifting away from a broken chromosome.

William Sullivan calls this a "" for the cell. The potential consequences include cell death or a cancerous cell growing out of control. But Sullivan, a professor of molecular, cell, and developmental biology at UC Santa Cruz, has found that the cell still has one more trick up its sleeve to rescue the broken chromosome.

The latest findings from Sullivan's lab, published in the June 5 issue of Journal of Cell Biology, reveal new aspects of a remarkable mechanism that carries broken through the process of cell division so that they can be repaired and function normally in the . Sullivan has been studying this process in the fruit fly Drosophila melanogaster. His lab has created a strain of flies in which broken chromosomes are common due to the expression of a DNA-cutting enzyme.

"We have flies in which 80 percent of the cells have double-strand breaks in the DNA, and the flies are fine," he said. "The cell has this amazing mechanism, like a Hail Mary pass with time running out."

Videos of dividing cells show both normal cell division, in which duplicated chromosomes (red) segregate neatly into two daughter cells, and complications resulting from a broken chromosome. Credit: Sullivan Lab, UC Santa Cruz

The mechanism involves the creation of a DNA tether which acts as a lifeline to keep the broken fragment connected to the chromosome. Powerful new microscopy techniques enable researchers to observe the whole process in living cells, with bright fluorescent tags highlighting the chromosomes and other cellular components.

When a cell divides, it duplicates its chromosomes to make one set for each of the daughter cells. The membrane around the nucleus, which keeps the chromosomes separate from the rest of the cell, breaks down. The two sets of chromosomes then line up and segregate to opposite sides of the cell, pulled apart by a structure of microtubules called the spindle. A new nuclear envelope forms around each set of chromosomes, and new cell membranes separate the two daughter cells.

Sullivan's research has shown that chromosome fragments don't segregate with the rest of the chromosomes, but get pulled in later just before the newly forming nuclear membrane closes. "The DNA tether seems to keep the nuclear envelope from closing, and then the chromosome fragment just glides right in at the last moment," Sullivan said.

If this mechanism fails, however, and the chromosome fragment gets left outside the nucleus, the consequences are dire. The fragment forms a "micronucleus" with its own membrane and becomes prone to extensive rearrangements of its genetic material, which can then be reincorporated into chromosomes during the next . Micronuclei and genetic rearrangements are commonly seen in cancer .

A DNA tether (red) acts as a rescuing life-line to pull chromosome fragments (blue) into the daughter nuclei during cell division. Credit: Ann Royou
"We want to understand the mechanism that keeps that from happening," Sullivan said. "We are currently identifying the genes responsible for generating the DNA tether, which could be promising novel targets for the next generation of cancer therapies."

Sullivan has just received a new four-year, $1.5 million grant from the National Institute of General Medical Sciences to continue this research.

Graduate student Travis Karg is first author of the new paper, which shows that spindle microtubules play an important role in driving the delayed segregation of chromosome fragments. The other coauthors, in addition to Sullivan, are Mary Williard Elting and Sophie Dumont at UC San Francisco and Hannah Vicars at UC Santa Cruz. This work was supported by grants from the National Institutes of Health.

Explore further: Protective barrier inside chromosomes helps to keep cells healthy

More information: Travis Karg et al, The chromokinesin Klp3a and microtubules facilitate acentric chromosome segregation, The Journal of Cell Biology (2017). DOI: 10.1083/jcb.201604079

Related Stories

Researchers shed light on shrinking of chromosomes

June 11, 2007

A human cell contains an enormous 1.8 metres of DNA partitioned into 46 chromosomes. These have to be copied and distributed equally into two daughter cells at every division. Condensation, the shortening of chromosomes, ...

What makes cell division accurate?

January 23, 2014

As all school-children learn, cells divide using a process called mitosis, which consists of a number of phases during which duplicate copies of the cell's DNA-containing chromosomes are pulled apart and separated into two ...

Team studies chromosome missegregation

May 3, 2016

A recent research study at The Hormel Institute, University of Minnesota is providing insight into the regulation of chromosome segregation and the mechanisms used by cells to prevent them from forming tumors.

Gluing chromosomes at the right place

October 8, 2014

During cell division, chromosomes acquire a characteristic X-shape with the two DNA molecules (sister chromatids) linked at a central "connection region" that contains highly compacted DNA. It was unknown if rearrangements ...

Recommended for you

Coffee-based colloids for direct solar absorption

March 22, 2019

Solar energy is one of the most promising resources to help reduce fossil fuel consumption and mitigate greenhouse gas emissions to power a sustainable future. Devices presently in use to convert solar energy into thermal ...

NASA instruments image fireball over Bering Sea

March 22, 2019

On Dec. 18, 2018, a large "fireball—the term used for exceptionally bright meteors that are visible over a wide area—exploded about 16 miles (26 kilometers) above the Bering Sea. The explosion unleashed an estimated 173 ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.