Repeat Expansion Disorders
Repeat Expansion Disorders - Related Videos
09:42
Analysis of Thermal Expansion via Dilatometry
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2023
Source: J. Jacob Chavez, Ryan T. Davis, and Taylor D. Sparks, Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT Thermal expansion is extremely important when considering which materials will be used in systems that experience fluctuations in temperature. A high or low thermal expansion in a material may or may not be desirable, depending on the application. For instance, in a common liquid thermometer, a material with a high thermal expansion would be...
02:18
Intrinsically Disordered Proteins
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2020
Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
01:28
Infinitely Repeated Games
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2025
An infinitely repeated game is a scenario where players repeatedly engage in the same game without a predetermined end. This concept is crucial in understanding long-term interactions in various fields of the social sciences, including economics and international relations. Examples: Firms Setting Prices: Companies continuously adjust prices. Trade Negotiations: Countries consistently negotiate trade terms. Tit-for-Tat Strategy Cooperative Start: Players begin with a cooperative action,...
06:17
Repeated Blood Collection for Blood Tests in Adult Zebrafish
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Cited by 87 •
2015
Repeated blood sampling is necessary and important in animal research. We developed a novel, non-lethal and reliable method for repeated blood collection from adult zebrafish, and applied this method to the study of blood biochemistry, including glucose metabolism.
10:17
An Introduction to Modeling Behavioral Disorders and Stress
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2023
Recently, it has been discovered that behavioral conditions such as, depression, anxiety and stress-response have a neurological basis. Understanding the biological underpinnings of these conditions may help scientists in developing more effective therapies to treat these disorders. Typically, rodent models are used in this field and behavioral scientists create these models using interventions like drug administration or surgery. It is important to understand how to create and evaluate rodent...
FAQs
During DNA replication or repair, repetitive sequences can mispair rather than align correctly. This misalignment can create a looped DNA structure. If the loop is retained or copied, the repeat tract may gain additional units. Such instability provides a molecular explanation for why repeat numbers can change between generations and contribute to inherited disease patterns.
The location and sequence of an expanded tract help determine its biological effect. An expansion within or near a gene may interfere with gene activity and silence it. In other cases, the expanded sequence can lead to toxic RNA or protein. Thus, disorders sharing repeat instability can differ because the affected gene and molecular product differ.
Genetic anticipation reflects changing repeat behavior across generations. As a repeat tract expands in a family line, disease-associated effects may appear earlier or become more severe in descendants. This pattern connects a molecular change, increasing repeat length, with a recognizable inheritance pattern. It is therefore important when interpreting family histories and considering disease manifestation in successive generations.
Gene silencing reduces or disrupts normal gene activity, whereas toxic RNA or protein can produce harmful effects through an abnormal molecular product. These mechanisms represent distinct consequences of repeat expansion. Comparing them helps explain why repeat-associated diseases can vary in their biology and why therapeutic strategies may need to address the specific outcome produced by an expansion.
A central focus is whether repeat tracts change during DNA replication or repair and across generations. Relating those changes to gene function helps investigators determine whether an expansion may silence a gene or generate toxic RNA or protein. This analysis connects sequence instability with inheritance patterns and disease-associated molecular effects, providing a biological basis for further study.
Molecular diagnosis can use repeat instability as a basis for identifying the genetic change associated with disease. Genetic counseling can then incorporate the inherited nature of expansion and the possibility of anticipation, including earlier onset or increased severity in successive generations. Together, these applications translate molecular observations into information relevant to affected families.
Because expansion can disrupt gene function through more than one route, therapeutic development must address the relevant molecular consequence. Strategies directed toward gene silencing, toxic RNA, or toxic protein could correspond to different disease mechanisms. Studying repeat instability therefore clarifies disease biology while helping define molecular targets for treatment development.