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Home » Dental Diseases » Dental Caries » This Rare Bacteria Accelerates Tooth Decay

This Rare Bacteria Accelerates Tooth Decay

Aastha KapoorBy Aastha KapoorUpdated:February 18, 20194 Mins Read
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Tooth decay: Recent research study

Contents Hide
1 Tooth decay: Recent research study
2 Tooth Decay Research Study
3 Research team and findings

Tooth decay is considered as the most prevalent chronic disease in children and adults. This mainly occurs when the level of good and bad bacteria in your mouth gets imbalanced. The bad bacterium, Streptococcus mutans, forms a biofilm by consuming the sugar and ferments it into acid. This acid causes decalcification of your tooth and results in cavity formation.

Scientists have found another harmful bacterium called Streptococcus sobrinus, which accelerates tooth decay in some people, but very little information is known about this microbe. A team of Illinois Bioengineering researchers led by Assistant Professor Paul Jensen has successfully sequenced the complete genomes of three different strains of S. sobrinus, to study further about these bacteria.

Tooth Decay Research Study

Dr. Jensen states that S. sobrinus is a difficult bacterium to work with in the laboratory, as it is not found in most people. So, researchers decided to understand and study the more stable and prevalent bacteria S. mutans, which was sequenced in 2002.

Researcher found that if S. sobrinus is present along with S. mutans in your mouth, you are at a high risk of uncontrollable tooth decay. This analysis helped researchers to conclude that both these bacteria communicate with each other, but the mechanism was not understood.

Biomaterial Keeps Tooth Alive After Root Canal

Professor Jensen’s team has completed sequencing the genome of S. sobrinus bacteria and is building computational models to better understand interaction of both these bacteria which cause severe tooth decay. Causes of tooth decay.

They have confirmed that S. sobrinus lacks complete pathways for quorum sensing, which indicates that the bacteria does not have the ability to sense and react to nearby bacteria, leading to its proliferation.

According to Jensen, S. mutans sends feelers in the form of a peptide to identity other S. mutans cells in its vicinity. Once the S. mutans cells reach a certain threshold, they attack and create an imbalance in a person’s mouth, leading to rapid cavity formation.

Jensen states that “the S. sobrinus bacterium doesn’t have a complete system to do this. He and his team were really curious to explore this further and find out the unknown mechanism”.

Dr. Jensen, a researcher at the Carl R. Woese Institute for Genomic Biology found that despite of S. sobrinus being rare bacteria, it produces acid at a faster rate and is associated with lowest clinical outcomes, especially among children.

Research team and findings

The entire S. sobrinus genome sequencing was completed by a small team of Bioengineering undergraduates and one-year Master of Engineering (M.Eng.) program students, rather than doctoral candidates who typically conduct such research over several years.

Re-growing Dental Tissue with Stem Cells

“For S. sobrinus bacteria, this is groundbreaking work because the field was plagued by a lack of information,” said Jensen. “In 2018, it is surprising to find a new bacterial species that causes disease and has no complete genome. An ambitious team of undergraduates and Master of Engineering students completed the sequencing task in a year.”

Mia Sales, graduated with her bachelor’s degree, had completed the assemblies of two species of S. sobrinus. She also built the computer that other team members used to do the initial genome assemblies.

Fellow undergraduate student, Will Herbert worked on the annotation part of the project. He found genes in the strings of approximately 2 million adenine (A), cytosine (C), guanine (G), and thymine (T) nucleotides that make up the S. sobrinus complete genome.

Other members of the research team include M.Eng. Students Yuting Du, Amitha Sandur, and Naaman Stanley. Professor Dipanjan Pan, director of the M.Eng. Program said “this work exemplifies the students’ capability to create new learning experience with a completely novel approach, which resulted in an original research publication”.

The Illinois team has also uploaded the sequencing information to the GenBank public database, so that scientists worldwide can have access to the S. sobrinus genomic information. Their findings were published in the journal of Microbial Resource Announcements under the title: “Complete genomic sequences of Streptococcus sobrinus SL1 (ATCC 33478 = DSM 20742), NIDR 6715 (ATCC 27351 & 27352), and NCTC 10919 (ATCC 33402).”

The research work was funded by the NIH National Institute of Dental and Craniofacial Research and the Illinois Master of Engineering in bioengineering program.

Aastha Kapoor

    Aastha Kapoor is a biotechnologist who loves to work for the human field and, at the same time, explore biotechnology. She pursued Masters in Biotechnology from Amity University, Noida, and has worked as a Research Trainee at the School of Life Sciences, Jawaharlal Nehru University. Aastha has worked as a Senior Research Associate at Maxinov Solutions.

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