Z_2_08 — Prion Genetics and Misfolded Proteins

Prions are infectious agents composed entirely of misfolded protein — the only known pathogen that contains no nucleic acid (no DNA, no RNA). The protein-only hypothesis (Stanley Prusiner, 1982 — Nobel Prize 1997) states

Z_2_18 — Pharmacogenomics and Precision Medicine

Pharmacogenomics — the study of how genetic variation affects individual responses to drugs — aims to replace the "one-size-fits-all" prescribing model with genotype-guided therapy, selecting the right drug at the right

Z_2_12 — Genetics of Pain Perception

Pain perception — the subjective experience triggered by actual or potential tissue damage — varies enormously across individuals, with genetic factors accounting for 25–50% of the variance in pain sensitivity (twin stud

Z_2_09 — Mitochondrial Genetics and Diseases

Human mitochondrial DNA (mtDNA) is a 16,569-bp circular genome encoding 37 genes: 13 proteins (all subunits of the oxidative phosphorylation/OXPHOS complexes I, III, IV, and V), 22 transfer RNAs, and 2 ribosomal RNAs. Un

Z_2_06 — Nutrigenomics and Diet-Gene Interactions

Nutrigenomics — the study of how genetic variation influences nutritional requirements, dietary responses, and disease susceptibility — and its complement nutrigenetics (how diet influences gene expression) represent a r

Z_2_11 — Genetics of Immunity and MHC Diversity

The major histocompatibility complex (MHC) — known as the human leukocyte antigen (HLA) system in humans — is the most polymorphic gene region in the human genome, encoding cell-surface glycoproteins essential for adapti

Z_2_00 — Medical Genetics Health: Subfolder Summary

Z_2_07 — Genetics of Disease Resistance

Infectious disease has been the most powerful selective force shaping the human genome, leaving signatures across thousands of loci. The best-understood example is sickle cell disease (HbS, Glu6Val in HBB): heterozygous

Z_1_17 — Environmental Epigenetics & Toxicogenomics

Environmental epigenetics examines how chemical exposures, nutritional states, and ecological stressors modify gene expression without altering DNA sequence — through DNA methylation, histone modifications, and non-codin

Z_1_18 — Junk DNA & the ENCODE Controversy: Function, Noise, and the Human Genome

The term "junk DNA" — coined by Susumu Ohno (1972) to describe non-coding DNA sequences in eukaryotic genomes that appeared to have no functional role — ignited one of the most contentious debates in modern genomics: how

Z_1_05 — Genomic Imprinting and Parent-of-Origin Effects

Genomic imprinting is an epigenetic phenomenon in which a gene's expression depends on whether it was inherited from the mother or the father — violating the standard Mendelian assumption that both parental copies functi

Z_1_03 — Human Genome Project and Its Legacy

The Human Genome Project (HGP), launched in 1990 and completed in 2003, was the largest coordinated biological research effort in history — a $3 billion, 13-year international collaboration to sequence all ~3.2 billion b

Z_1_00 — Genome Structure Organization: Subfolder Summary

Z_1_12 — Genome Architecture and 3D Organization

The human genome — approximately 6.4 billion base pairs of DNA — is packed into a nucleus only ~6 μm in diameter. If stretched end-to-end, the DNA of a single human cell would extend about 2 meters, yet it is packaged an

Z_1_11 — Polyploidy and Genome Duplication

Polyploidy — the possession of more than two complete sets of chromosomes — is a major force in genome evolution, particularly in plants and some animal lineages. Susumu Ohno (1970) proposed that whole genome duplication

Z_4_00 — RNA Protein Cell Biology: Subfolder Summary

Z_4_02 — Stem Cells and Pluripotency

Stem cells — defined by the dual capacity for self-renewal (division producing at least one daughter cell retaining stemness) and differentiation (specialization into distinct cell types) — are the foundational building

Z_4_12 — Autophagy: The Cell's Self-Eating Recycling System

Autophagy (from Greek auto "self" + phagein "to eat") — the process by which cells degrade and recycle their own components — is a fundamental cellular quality control and survival mechanism conserved from yeast to human

Z_4_23 — Memory as Physical and Molecular Phenomenon

What is a memory made of? The question has driven neuroscience from Santiago Ramón y Cajal's 1894 hypothesis that learning strengthens connections between neurons, through Donald Hebb's 1949 postulate that "neurons that

Z_4_22 — Protein Chaperone Systems

Molecular chaperones are a diverse group of proteins that assist other proteins in achieving and maintaining their correct three-dimensional structures — preventing misfolding, aggregation, and toxic accumulation of non-