Based on the following clinical scenario, identify the most likely autoimmune disorder and explain how the described physiological damage leads to the patient's specific symptoms.

Clinical Scenario Analysis

Multiple sclerosis (MS) is an autoimmune disorder characterized by the widespread loss of the myelin sheath on axons throughout the nervous system. This damage interferes with the electrical signal, preventing the rapid transmission of information between neurons. Symptoms can include dizziness, fatigue, loss of motor control, and sexual dysfunction. While treatments can help manage symptoms and modify the disease's course, there is currently no known cure for MS.

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University of California, Davis

- Metabolic diseases
- Type-1, 2 diabetes
- Cardiovascular disease
- Inflammatory bowel disease (IBD) and Irritable bowel syndrome (IBS)
- Multiple sclerosis

Gut Microbiome and Human Diseases

The myelin sheath is a fatty substance formed by glial cells that coats a neuron's axon. It functions as an insulator, which increases the speed at which electrical signals travel down the axon. This insulation is crucial for the normal operation of neurons, and its loss can severely impair nervous system function.

Myelin Sheath

(1) Willey, J.. Prescott's Microbiology. McGraw-Hill Higher Education, 11th ed. (2020), c.34.

(2) Thursby, Elizabeth, and Nathalie Juge. “Introduction to the human gut microbiota.” The Biochemical journal vol. 474,11 1823-1836. 16 May. 2017, doi:10.1042/BCJ20160510

(3) Jessica Cording, M.S. “Want To Avoid Gas & Bloating At Holiday Parties? Don't Eat This Healthy Food.” Mindbodygreen, Mindbodygreen, 29 Sept. 2020,www.mindbodygreen.com/articles/how-cruciferous-vegetables-can-cause-gas-and-bloating . 

(4) John P. Cunha, DO. “Low FODMAP Diet for IBS: List of Foods to Eat and Avoid.” MedicineNet, MedicineNet, 17 Feb. 2021, www.medicinenet.com/low_fodmap_diet_list_of_foods_to_eat_and_avoid/article.htm#:~:text=FODMAPs%20are%20not%20absorbed%20well,Gas. 

(5) Jessica Cording, M.S. et al.  “Want To Avoid Gas &amp; Bloating At Holiday Parties? Don't Eat This Healthy Food.” Mindbodygreen, Mindbodygreen, 29 Sept. 2020, www.mindbodygreen.com/articles/how-cruciferous-vegetables-can-cause-gas-and-bloating. 

(6) Doucleff, Michaeleen. “Chowing down on Meat, Dairy Alters Gut Bacteria a Lot, and Quickly.” NPR, NPR, 11 Dec. 2013, www.npr.org/sections/thesalt/2013/12/10/250007042/chowing-down-on-meat-and-dairy-alters-gut-bacteria-a-lot-and-quickly. 

(7)Villines, Zawn. “The Worst Foods for Gut Health.” Medical News Today, MediLexicon International, 5 Sept. 2019, www.medicalnewstoday.com/articles/326256#:~:text=A%202019%20study%20suggested%20that,of%20heart%20attack%20and%20stroke. 

(8) Ana Maldonado-Contreras Assistant Professor of Microbiology and Physiological Systems. “A Healthy Microbiome Builds a Strong Immune System That Could Help Defeat Covid-19.” The Conversation, 25 May 2021, theconversation.com/a-healthy-microbiome-builds-a-strong-immune-system-that-could-help-defeat-covid-19-145668. 

(9) “How Your Gut Affects Your Immune System: A Symbiotic Relationship.” GilbertLab, 8 June 2021, gilbertlab.com/immune-system/gut-microbiome-symbiosis/.  

(10) Zanteson, Lori. “Gut Health and Immunity - It's All about the Good Bacteria That Can Help Fight Disease.” Today's Dietitian, 2012, www.todaysdietitian.com/newarchives/060112p58.shtml. 


Microbiomes References

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

- Bacteria and cancer treatment efficacy
- Bacteria that promote cancer progression

Gut Microbiome and Cancer

Study in mice:
- Colonization of microbiomes increases LPL-triglyceride storage
- Lipopolysaccharide (LPS) in gut can lead to inflammatory; hence, result in obesity

Metabolic Diseases

Type-1 Diabetes may be influenced by:
- Decreased in diversity of gut microbiome
- Functions related to stress response, sulfur metabolism, etc. are enhanced

Type-2 Diabetes may be associated with:
- Imbalanced of microbiomes

Type-1,2 Diabetes

- Specific microbiomes, whose function is synthesizing peptidoglycan, is increased in number.
- The production of Trimethylamine from microbiomes promotes atherosclerosis.

Cardiovascular Diseases

- IBD and subtypes IBS patients presents specific composition of microbiome, including the reduction of anti-inflammatory bacteria

Ex: Crohn's disease: observes the decrease in microbial diversity


Inflammatory Bowel Disease (IBD)/ Irritable Bowel Syndrome (IBS)

Multiple Sclerosis

The Nodes of Ranvier are the small gaps in the myelin sheath that are found down the axon. 

Nodes of Ranvier

Imagine two neurons of the same length are tasked with sending an electrical signal. Neuron A's axon is coated with a thick, fatty substance that acts as an insulator. Neuron B's axon lacks this coating. Which of the following statements most accurately predicts the functional difference between these two neurons?

Based on the provided scenario, which component of a neuron is most likely compromised, and how does its impairment lead to the observed symptoms?

Neural Signal Transmission Impairment

Phenylketonuria (PKU) is a genetic disorder that leads to a reduction in myelin and causes abnormalities in the white matter of cortical and subcortical brain structures. Because the myelin sheath acts as an essential insulator for axons, its loss severely impairs normal neural operations. Consequently, this myelin reduction is associated with significant neurological issues, including severe cognitive deficits, exaggerated reflexes, and seizures.

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