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Mitochondrial Dysfunction in Spinal Muscular Atrophy Study Guide

This guide explores the fundamental concept of compartmentalization in eukaryotic cells. Learn about the distinct roles of the nucleus, nucleolus, cytoplasm, mitochondria, and cytoskeleton. Understand how these specialized compartments work together to maintain cellular life, regulate biochemical processes, and optimize metabolic efficiency. This content is suitable for students and anyone interested in basic cell biology.

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Structure, Function, and Pathology of the Nucleus and Nucleolus

Structure and Function of Cellular Organelles

Overview of the structure and function of cellular organelles, pathological changes, and the consequences for the functioning of the cell.

  • Nucleus
  • Mitochondria
  • Endoplasmic Reticulum
  • Golgi Apparatus
  • Lysosomes
  • Cytoskeleton
  • Nucleoskeleton
  • Intermediate filaments
  • LINC complex
  • Cell membranes
  • Cell junctions
  • Nuclear pores
  • Apoptosis
  • DNA damage and repair
  • Viruses

Compartmentalization of the Eukaryotic Cell

This document illustrates compartmentalization as an important feature of the eukaryotic cell including the nucleus, cytoplasm, cytosol, and cytoplasmic organelles.

  • Compartmentalization
  • Eukaryotic Cell
  • Nucleus
  • Cytoplasm
  • Cytosol
  • Cytoplasmic organelles
  • Cytoskeleton

Nucleus, Chromatin, and Nucleolus Structure

This content examines nuclear morphology, chromatin organization including euchromatin and heterochromatin, and the tripartite structure of the nucleolus.

  • Nuclear morphology
  • Euchromatin
  • Heterochromatin
  • Nucleosomes
  • Epigenetic gene silencing
  • Nucleolus
  • Fibrillar center
  • Dense fibrillar component
  • Granular compartment
  • Nuclear envelope

Nucleolus Organization and Ribosome Biogenesis

The nucleolus facilitates ribosome biogenesis through rDNA transcription, rRNA processing, and pre-ribosomal subunit assembly.

  • Ribosome biogenesis
  • Nucleolus organization
  • Dense fibrillar component (DFC)
  • Granular component (GC)
  • rDNA transcription
  • rRNA processing
  • 40S and 60S ribosome subunits
  • Cell cycle control
  • Cellular stress sensor

Nucleolar Stress and Cellular Pathology

The nucleolus functions as a stress sensor and responds by undergoing enlargement or disruption leading to ultrastructural modifications and nucleolar dysfunction.

  • Nucleolar enlargement
  • Nucleolar disruption
  • rRNA transcription inhibition
  • Nucleolar components segregation
  • Genotoxic stress
  • rDNA transcriptional deregulation

Nucleus, Nucleolus, and Viral Pathologies

The functional importance of the nucleus and nucleolus is explored alongside pathological changes such as intranuclear tubules, vesicles, and crystalline inclusions caused by viral infections.

  • chromatin
  • euchromatin
  • heterochromatin
  • nucleolus
  • rRNA processing
  • ribosome biogenesis
  • intranuclear tubules and vesicles
  • crystalline inclusions
  • herpes simplex virus particles
  • measles virus infection
  • nucleic acid viruses
  • viral capsid

Eukaryotic Cell and Mitochondrial Structure

This content illustrates the eukaryotic cell anatomy and the internal structure of a mitochondrion including the outer membrane, inner membrane, cristae, intermembrane space, and matrix.

  • Eukaryotic cell organelles
  • Mitochondrial structure
  • Outer membrane
  • Inner membrane
  • Intermembrane space
  • Mitochondrial matrix
  • Mitochondrial DNA
  • Citric acid cycle
  • Respiratory chain enzymes

Mitochondrial Structure and Function Changes

Correlation between mitochondrial structure and the function and performance of mitochondria in neuronal and nonneuronal cells.

  • Mitochondrial number
  • Cristae number and shape
  • Mitochondrial size and shape
  • Mitochondrial distribution
  • Metabolic activity
  • Synaptic performance

Changes in Mitochondrial Size and Shape

This document illustrates changes in mitochondrial size, shape, distribution, and morphology associated with viral infection, chemical toxicity, and specific disorders.

  • mitochondrial pathology
  • megamitochondria
  • ring and cup-shaped mitochondria
  • mitochondrial distribution
  • mitochondrial hyperplasia
  • crystalline inclusions
  • dense granules

Mitochondrial Transfer from BMSCs to AML Cells

Mitochondrial Transfer in Acute Myeloid Leukemia

Acute myeloid leukemia cells acquire mitochondria from bone marrow stromal cells through tunneling nanotubes driven by reactive oxygen species and oxidative stress.

  • Mitochondria
  • ATP production
  • Bone marrow stromal cells (BMSC)
  • Tunneling nanotubes
  • Reactive oxygen species (ROS)
  • Oxidative stress
  • Mitochondrial respiration

Mitochondrial Dysfunction and Related Disorders

Mitochondrial Dysfunction in Spinal Muscular Atrophy

Spinal muscular atrophy is an inherited neuromuscular disorder caused by mutations in the SMN1 gene that leads to impaired mitochondrial function, biogenesis, and homeostasis.

  • Spinal muscular atrophy (SMA)
  • SMN1 gene mutations
  • Mitochondrial homeostasis
  • Mitochondrial biogenesis
  • ATP synthesis
  • Oxidative stress
  • Motor neuron degeneration

Mitochondrial Function and DNA Damage

Mitochondrial dysfunction arises from mutations in mitochondrial DNA or nuclear genes, leading to energy deficits and various clinical disorders.

  • Mitochondrial DNA damage
  • Oxidative damage
  • Mitochondrial dysfunction
  • Sarcopenia
  • Muscle fiber atrophy
  • ATP production
  • Neurological disorders

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