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Related Concept Videos

Huntington Disease l: Introduction01:21

Huntington Disease l: Introduction

Huntington disease or HD is a progressive, fatal neurodegenerative disorder inherited in an autosomal dominant pattern.PathophysiologyIt is caused by expansion of the CAG trinucleotide repeat in the HTT gene on chromosome 4 (4p16.3), producing an abnormal huntingtin protein with an expanded polyglutamine tract. This misfolded protein disrupts cellular function, leading to neuronal death. Normal alleles have ≤26 repeats, 27–35 are intermediate (risk of expansion), 36–39 show reduced penetrance,...
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Animal Mitochondrial Genetics

Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Pleiotropy

Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
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Cardiomyopathy III: Hypertrophic Cardiomyopathy

Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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Mitochondrial Precursor Proteins

Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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Pedigree Analysis01:35

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Modeling Mitochondrial Disease Using Brain Organoids: A Focus on Mitochondrial Encephalomyopathy, Lactic Acidosis, and Stroke-like Episodes
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Hypertrichosis in presymptomatic mitochondrial disease.

Fabian Baertling1, Ertan Mayatepek, Felix Distelmaier

  • 1Department of General Pediatrics, Neonatology and Pediatric Cardiology, University Children's Hospital, Heinrich-Heine-University, Moorenstr. 5, 40225, Düsseldorf, Germany.

Journal of Inherited Metabolic Disease
|February 15, 2013
PubMed
Summary

Leigh syndrome, a neurometabolic disorder, can manifest with distinct hypertrichosis. This finding in infants may indicate underlying SURF1 gene mutations, warranting further genetic analysis.

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Area of Science:

  • Neurology
  • Genetics
  • Dermatology

Background:

  • Leigh syndrome is a severe neurometabolic disorder characterized by oxidative phosphorylation defects.
  • It typically presents with neurological deficits and characteristic brain lesions.
  • Cutaneous manifestations can sometimes accompany the neurological symptoms.

Observation:

  • A case study of a one-year-old patient with Leigh syndrome is presented.
  • The patient exhibited distinct hypertrichosis (excessive hair growth).
  • This hypertrichosis was observed in an otherwise asymptomatic presentation.

Findings:

  • The patient was found to have pathogenic SURF1 gene mutations.
  • Hypertrichosis was identified as a potential cutaneous marker for Leigh syndrome.
  • The SURF1 gene is crucial for mitochondrial complex assembly and function.

Implications:

  • Distinct hypertrichosis may serve as an early indicator for Leigh syndrome.
  • Prompting SURF1 gene mutation analysis in suspected cases can aid in early diagnosis.
  • This highlights the importance of considering dermatological signs in diagnosing complex genetic disorders.