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Related Concept Videos

Human Genetics01:28

Human Genetics

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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Incomplete Dominance01:43

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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
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An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
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Novel Findings into AIRE Genetics and Functioning: Clinical Implications.

Lucia De Martino1, Donatella Capalbo2, Nicola Improda1

  • 1Pediatric Section, Department of Translational Medical Sciences, Federico II University , Naples , Italy.

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Summary

Autoimmune Polyendocrinopathy Candidiasis Ectodermal Dystrophy (APECED) is a monogenic autoimmune disease caused by AIRE gene mutations. Recent studies reveal new insights into AIRE

Keywords:
AIREAPECEDautoimmune diseasediagnosismutations

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Area of Science:

  • Immunology
  • Genetics
  • Endocrinology

Background:

  • Autoimmune Polyendocrinopathy Candidiasis Ectodermal Dystrophy (APECED), previously known as autoimmune polyendocrine syndrome type 1, is a monogenic autoimmune disorder.
  • It results from mutations in the autoimmune regulator (AIRE) gene, which is crucial for maintaining immunological central tolerance.
  • AIRE functions as a transcription regulator, promoting the expression of tissue-specific antigens in the thymus to educate the immune system.

Purpose of the Study:

  • To review recent advancements in understanding the molecular mechanisms of APECED pathogenesis.
  • To explore the role of AIRE in immune self-tolerance and its regulation.
  • To discuss the clinical implications of novel findings in APECED.

Main Methods:

  • Review of recent scientific literature on APECED and AIRE function.
  • Analysis of studies involving both human APECED cases and experimental mouse models.
  • Synthesis of findings related to molecular mechanisms, pathogenesis, and clinical manifestations.

Main Results:

  • AIRE's function in inducing ectopic thymic expression of tissue-specific antigens is key to central tolerance.
  • Despite being monogenic, APECED exhibits significant clinical variability, with genotype-phenotype correlations remaining unclear.
  • Recent research has shed light on AIRE's regulatory functions and their impact on immune self-tolerance.

Conclusions:

  • Novel insights into AIRE's function and regulation are improving the understanding of APECED pathogenesis.
  • Further research is needed to fully elucidate the complex mechanisms underlying APECED's clinical variability.
  • These advancements hold potential for improved diagnosis and therapeutic strategies for APECED.