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Tian Xia

Tian Xia

Preferred Name:

Summer

Education:

B.S. Biochemistry and Molecular Biology, Minor in Psychology

Class of 2021

Pennsylvania State University, State College PA 

From: Shenzhen, China

Joined David Lab: January 2022

Outside of the lab: I play Guzheng, a traditional Chinese instrument; I love baking cakes and cooking; I also enjoy traveling and exploring foods.

Research in David Lab:

As a consequence of cellular respiration, reactive oxygen species would form and pose threats to the integrity of the genome. A common product of oxidized guanine is 8-oxo-7,8-dihydroguanine (8-oxoG), in which the syn conformation promotes a Hoogsteen pairing with adenine. Misincorporation of adenine instead of cytosine and subsequent replication would lead to a G:C to A:T mutation. The accumulation of mutation in the Adenomatous Polyposis Coli (APC) gene is correlated to the early onset of colorectal cancer (CRC). As a defense against the mutation, MUTYH, a base excision repair (BER) enzyme, cleaves the adenine paired opposite to 8-oxoG. Germ-line mutations in MUTYH have been linked to an autosomal recessive form of familial CRC termed MUTYH-associated Polyposis (MAP). It is crucial to understand the structure and mechanism of MUTYH to predict and prevent disease. I’m interested in elucidating the structure and function of MUTYH through cellular repair assay. To be more specific, I generate MUTYH mutants by site-directed mutagenesis and measure the OG:A repair percentage by mutant cell lines using a reporter assay. The result would provide support to our proposed MUTYH structure. 

 

RSS Science Daily News

  • Big-Bang echoes unmask a billion-light-year hole around Earth—and it’s stretching space faster July 15, 2025
    Our galaxy may reside in a billion-light-year-wide cosmic bubble that accelerates local expansion, potentially settling the long-running Hubble tension. Galaxy counts reveal a sparsely populated neighborhood, and “fossil” sound waves from the Big Bang bolster the void scenario, hinting that gravity has hollowed out this region. Confirming the bubble could refine the universe’s age and […]
  • Hubble Cracks Open a Glittering Cosmic Time Capsule, Revealing Multi-Generational Stars 160,000 Light-Years Away July 15, 2025
    Hubble’s crystal-clear look at NGC 1786—an ancient globular cluster tucked inside the Large Magellanic Cloud—pulls us 160,000 light-years from Earth and straight into a cosmic time machine. Packed with stars of several different ages, this glittering sphere helps astronomers test whether layered “generations” of suns are common across galaxies. By comparing NGC 1786 and other […]
  • One shot, seven days: Long-acting levodopa gel tackles Parkinson’s tremors July 14, 2025
    Researchers in Australia have created a biodegradable gel that delivers Parkinson’s medications through a single weekly shot, replacing the need for multiple daily pills. Injected just under the skin, the gel steadily releases levodopa and carbidopa for seven days, helping keep tremors and stiffness in check while easing side effects linked to fluctuating doses.
  • Can zebrafish help humans regrow hearing cells? July 14, 2025
    Zebrafish can regenerate sensory hair cells that humans permanently lose, like those in the inner ear linked to hearing and balance. New research reveals two specific genes that control how different supporting cells in zebrafish divide and regenerate, offering clues to how mammals might someday tap into similar regenerative powers.
  • It looked like nothing—then scientists found a world 10x the size of Jupiter July 14, 2025
    Astronomers have uncovered a massive, hidden exoplanet nestled in the dusty disc of a young star—MP Mus—by combining cutting-edge data from the ALMA observatory and ESA’s Gaia mission. Initially thought to be planet-free, the star’s surrounding disc appeared deceptively empty. But new observations and a telltale stellar “wobble” pointed to a Jupiter-sized gas giant forming […]

Contact:

Dr. Sheila S. David
ssdavid@ucdavis.edu
(530)-752-4280

Department of Chemistry
One Shields Ave.
Davis, CA 95616