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Glucose Transporters01:27

Glucose Transporters

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Glucose transporters facilitate the transport of glucose across the cell membrane. In addition to glucose, some glucose transporters can also aid the movement of other hexoses such as fructose, mannose, and galactose.
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Single Nucleotide Polymorphisms-SNPs01:05

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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Pharmacological therapies for IBS-C are designed to alleviate abdominal discomfort and enhance bowel function. In patients with IBS-C, fiber supplements may help soften stools and decrease straining, but may also lead to increased gas production and bloating. Osmotic laxatives like milk of magnesia are frequently used to soften stools and increase stool frequency in IBS-C patients. In addition, two drugs approved for use in severe IBS-C adult cases are linaclotide (Linzess) and lubiprostone...
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Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
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Inducible Operons: lac Operon01:25

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The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA...
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Updated: Jul 17, 2025

Measuring Lactase Enzymatic Activity in the Teaching Lab
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Lactose Intolerance - Single Nucleotide Polymorphisms and Treatment.

Zlatina Chengolova1, Radina Ivanova2, Katya Gabrovska1

  • 1Biotechnology Department, "Prof. Dr Assen Zlatarov" University, Burgas, Bulgaria.

Journal of the American Nutrition Association
|August 28, 2023
PubMed
Summary
This summary is machine-generated.

Lactose intolerance affects 70% of the global population, causing discomfort and nutrient reduction. Understanding lactose intolerance, its causes, and management can prevent unnecessary dairy avoidance and improve health.

Keywords:
Lactose intolerancelactase genelactose intolerance treatmentlactose metabolismsingle nucleotide polymorphism

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Area of Science:

  • Human physiology
  • Gastroenterology
  • Nutritional science

Background:

  • Lactose intolerance affects approximately 70% of the global population.
  • It leads to discomfort and avoidance of dairy products, reducing essential nutrient intake.
  • This can negatively impact overall health and well-being.

Purpose of the Study:

  • To present lactose synthesis and catabolism in the human body.
  • To discuss types and diagnostic methods for lactose intolerance.
  • To explore genetic causes, diagnostic tests, and treatment solutions.

Main Methods:

  • Review of scientific literature on lactose metabolism.
  • Analysis of diagnostic techniques for lactose intolerance.
  • Evaluation of current and future treatment strategies.

Main Results:

  • Detailed explanation of lactose synthesis and breakdown pathways.
  • Categorization of different types of lactose intolerance.
  • Overview of genetic factors and diagnostic tests, including genetic testing.
  • Presentation of existing and emerging treatment options.

Conclusions:

  • Knowledge of lactose intolerance can prevent unnecessary dietary restrictions.
  • Accurate diagnosis and understanding of genetic causes are crucial.
  • Effective management strategies, including dietary adjustments and future therapies, can mitigate symptoms and improve nutrient intake.