Allison Perry

UK Study Shows Potential New Way to Detect Colorectal and Other Cancers

Published: Apr 25, 2013

LEXINGTON, Ky. (April 25, 2013) — A unique new study led by University of Kentucky Markey Cancer Center researchers Guo-Min Li and Libya Gu, in collaboration with Dr. Wei Yang at National Institutes of Health, reveals a novel mechanism explaining the previously unknown root cause of some forms of colorectal cancers.

 

The study, published in Cell, discovers that an abnormal histone protein modification impairs a DNA repair machinery that controls cancer development, yielding a potential new way of detecting these types of colorectal cancers. It represents the first time that epigenetic histone marks regulate the genome maintenance system.

 

DNA errors created during DNA replication can lead to many forms of cancer, including colorectal cancer. Cells possess DNA mismatch repair (MMR) machinery that aids in correcting these errors, thus preventing disease development. Defects in MMR genes lead to development of colorectal cancers characterized by frequent alterations in simple repetitive DNA sequences, a phenomenon referred to as microsatellite instability (MSI). Some cancers develop in individuals who possess MSI without MMR gene defects, and until now, the reason for this has been unknown.

 

Dr. Li’s study shows that defects in SETD2 – an enzyme that is not involved in MMR but chemically or epigenetically modifies histone proteins associated with DNA that control the regulation of gene expression and DNA replication – prevent the association of MMR proteins with damaged DNA, thus preventing DNA mismatch repair.

 

"This study provides new clues to cancer etiology, that is, from the classical genetic defects to abnormal epigenetic modifications in the future," Li said. "Since SETD2 mutations have been shown in many types of cancers, including clear cell renal cell carcinoma, lung cancer, gastric cancer and hematological malignancies, our next goal is to determine association of MMR defects with these cancers, as well as SETD2 mutations in MSI-positive MMR-competent colorectal cancers."

 

Although most colorectal cancers are preventable or treatable with proper screening, colorectal cancer remains the second-leading cause of cancer death in the United States. Kentucky is ranked in the highest tiers for both colorectal and lung cancer incidence and death.

 

MEDIA CONTACT: Allison Perry, (859) 323-2399 or allison.perry@uky.edu 

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Natalie Frank: The Brothers Grimm
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Natalie Frank: The Brothers Grimm
Natalie Frank: The Brothers Grimm
Natalie Frank: The Brothers Grimm
Natalie Frank: The Brothers Grimm
Natalie Frank: The Brothers Grimm
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Natalie Frank: The Brothers Grimm
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Lawrence Tarpey: Figures & Grounds
Lawrence Tarpey: Figures & Grounds
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Eugene Meatyard & Duane Michals: Camera Drama
Eugene Meatyard & Duane Michals: Camera Drama
Eugene Meatyard & Duane Michals: Camera Drama
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UK Writing Center Open for Summer Session 2 (June 9-August 4)
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UK Writing Center Open for Summer Session 2 (June 9-August 4)
Natalie Frank: The Brothers Grimm
Lawrence Tarpey: Figures & Grounds
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Lawrence Tarpey: Figures & Grounds
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UK Writing Center Open for Summer Session 2 (June 9-August 4)
Natalie Frank: The Brothers Grimm
Lawrence Tarpey: Figures & Grounds
Eugene Meatyard & Duane Michals: Camera Drama
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8
UK Writing Center Open for Summer Session 2 (June 9-August 4)
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9
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10
UK Writing Center Open for Summer Session 2 (June 9-August 4)
Natalie Frank: The Brothers Grimm
Lawrence Tarpey: Figures & Grounds
Eugene Meatyard & Duane Michals: Camera Drama
Sun
11
UK Writing Center Open for Summer Session 2 (June 9-August 4)
Natalie Frank: The Brothers Grimm
Lawrence Tarpey: Figures & Grounds
Eugene Meatyard & Duane Michals: Camera Drama
Mon
12
UK Writing Center Open for Summer Session 2 (June 9-August 4)
Natalie Frank: The Brothers Grimm
Lawrence Tarpey: Figures & Grounds
Eugene Meatyard & Duane Michals: Camera Drama
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13
UK Writing Center Open for Summer Session 2 (June 9-August 4)
Natalie Frank: The Brothers Grimm
Lawrence Tarpey: Figures & Grounds
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UK Writing Center Open for Summer Session 2 (June 9-August 4)
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17
UK Writing Center Open for Summer Session 2 (June 9-August 4)
Birdhouse Display and Auction
Natalie Frank: The Brothers Grimm
Lawrence Tarpey: Figures & Grounds
Eugene Meatyard & Duane Michals: Camera Drama
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18
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Mon
19
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21
UK Writing Center Open for Summer Session 2 (June 9-August 4)
Birdhouse Display and Auction
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Lawrence Tarpey: Figures & Grounds
Eugene Meatyard & Duane Michals: Camera Drama
Thu
22
UK Writing Center Open for Summer Session 2 (June 9-August 4)
Birdhouse Display and Auction
Natalie Frank: The Brothers Grimm
Lawrence Tarpey: Figures & Grounds
Eugene Meatyard & Duane Michals: Camera Drama
Fri
23
UK Writing Center Open for Summer Session 2 (June 9-August 4)
Birdhouse Display and Auction
Natalie Frank: The Brothers Grimm
Lawrence Tarpey: Figures & Grounds
Eugene Meatyard & Duane Michals: Camera Drama
Sat
24
UK Writing Center Open for Summer Session 2 (June 9-August 4)
Birdhouse Display and Auction
Natalie Frank: The Brothers Grimm
Lawrence Tarpey: Figures & Grounds
Eugene Meatyard & Duane Michals: Camera Drama
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25
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Birdhouse Display and Auction
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Lawrence Tarpey: Figures & Grounds
Eugene Meatyard & Duane Michals: Camera Drama
Mon
26
UK Writing Center Open for Summer Session 2 (June 9-August 4)
Birdhouse Display and Auction
Natalie Frank: The Brothers Grimm
Lawrence Tarpey: Figures & Grounds
Eugene Meatyard & Duane Michals: Camera Drama
Tue
27
UK Writing Center Open for Summer Session 2 (June 9-August 4)
Birdhouse Display and Auction
Natalie Frank: The Brothers Grimm
Lawrence Tarpey: Figures & Grounds
Eugene Meatyard & Duane Michals: Camera Drama
Wed
28
UK Writing Center Open for Summer Session 2 (June 9-August 4)
Birdhouse Display and Auction
Natalie Frank: The Brothers Grimm
Lawrence Tarpey: Figures & Grounds
Eugene Meatyard & Duane Michals: Camera Drama
Thu
29
UK Writing Center Open for Summer Session 2 (June 9-August 4)
Birdhouse Display and Auction
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Natalie Frank: The Brothers Grimm
Lawrence Tarpey: Figures & Grounds
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Sat
31
UK Writing Center Open for Summer Session 2 (June 9-August 4)
Birdhouse Display and Auction
Natalie Frank: The Brothers Grimm
Lawrence Tarpey: Figures & Grounds
Eugene Meatyard & Duane Michals: Camera Drama
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