Genetic Condition & Gene Information Lookup •
Search human genetic conditions, chromosomal disorders, causative genes, inheritance patterns, diagnostic testing methods.
🔬 Interactive Inheritance Risk Calculator
Select an inheritance pattern and parental carrier status to compute offspring probability distribution and view the simulated Punnett matrix.
Simulated Punnett Matrix
Recurrence Probabilities per Pregnancy
Genetic Disorders & Conditions Catalog
Browse clinical entries or search by gene, chromosome locus, syndrome name, or symptom keywords.
Cystic Fibrosis
Mutations in the CFTR chloride channel cause thick, viscous mucus in lungs, pancreas, and gastrointestinal tract.
Huntington's Disease
Trinucleotide repeat expansion (CAG >= 36) in HTT gene producing huntingtin protein with polyglutamine tract toxic to striatal neurons.
Sickle Cell Disease
Glu6Val point mutation in beta-globin creating HbS variant that polymerizes under deoxygenated conditions, causing sickled erythrocytes.
Down Syndrome (Trisomy 21)
Presence of a third copy of chromosome 21 (95% maternal nondisjunction, 4% translocation, 1% mosaicism).
Marfan Syndrome
Defects in fibrillin-1 glycoprotein causing dysregulated TGF-beta signaling and systemic extracellular matrix weakness.
Hemophilia A
Deficiency or absence of coagulation Factor VIII, frequently caused by intron 22 or intron 1 inversions in the F8 gene.
Tay-Sachs Disease
Deficiency of beta-hexosaminidase A leading to progressive accumulation of GM2 gangliosides in central nervous system neurons.
Fragile X Syndrome
CGG trinucleotide expansion (>200 repeats, full mutation) causing hypermethylation and transcriptional silencing of FMR1 and loss of FMRP.
Neurofibromatosis Type 1
Loss-of-function variants in NF1 encoding neurofibromin, a GTPase-activating protein that downregulates Ras signaling.
Phenylketonuria (PKU)
Deficiency in phenylalanine hydroxylase (PAH) prevents conversion of phenylalanine to tyrosine, causing neurotoxic hyperphenylalaninemia.
Duchenne Muscular Dystrophy
Out-of-frame deletions or nonsense mutations in DMD encoding dystrophin, leading to muscle membrane fragility and fiber necrosis.
Turner Syndrome (45,X)
Complete or partial absence of the second sex chromosome in phenotypic females.
Klinefelter Syndrome (47,XXY)
Presence of one or more extra X chromosomes in phenotypic males, resulting in testicular insufficiency.
Familial Hypercholesterolemia
Defects in low-density lipoprotein receptor pathway leading to severe lifelong elevation in plasma LDL-C and premature atherosclerotic CAD.
Hereditary Breast and Ovarian Cancer
Pathogenic variants in homologous recombination repair genes predisposing to breast, ovarian, prostate, and pancreatic malignancies.
Spinal Muscular Atrophy
Homozygous deletion of exon 7 in SMN1 resulting in survival motor neuron protein deficiency and degeneration of spinal anterior horn alpha motor neurons.
Hereditary Hemochromatosis
Mutations in HFE disrupt regulation of the iron hormone hepcidin, causing uncontrolled intestinal iron absorption and parenchymal deposition.
Achondroplasia
Gain-of-function mutation (c.1138G>A or G>C) in FGFR3 causing constitutive inhibition of chondrocyte proliferation in growth plates.
Wilson Disease
Impaired biliary excretion of copper and impaired incorporation into ceruloplasmin due to defective ATP7B P-type ATPase transporter.
Charcot-Marie-Tooth Disease (Type 1A)
1.4 Mb duplication of 17p12 containing PMP22 encoding peripheral myelin protein 22, leading to demyelinating peripheral neuropathy.
About this tool
How to use it
- Search for a condition by name (e.g. 'Cystic Fibrosis'), gene symbol ('CFTR', 'BRCA1'), or chromosome cytogenetic location ('7q31', '15q21').
- Filter by inheritance mechanism: Autosomal Recessive, Autosomal Dominant, X-Linked, or Chromosomal Aneuploidy.
- Click any condition card to open the complete clinical summary, diagnostic testing protocols, and authoritative database citations.
- Use the Interactive Punnett Calculator to model reproductive transmission probabilities based on maternal and paternal carrier genotypes.
Why it matters
Genetic conditions affect millions of individuals globally. Navigating complex genetic terminology—such as cytogenetic bands, penetrance, recessive vs dominant inheritance, and carrier testing—requires clear, accessible, and structured educational references. This client-side reference offers instant lookup with zero tracking and full privacy.
When to use it
Use this tool for educational research, biology study, understanding family history screening results, or learning about inheritance recurrence probabilities.
Common questions
What is the difference between autosomal dominant and recessive inheritance?
Autosomal dominant conditions require only one mutated gene copy from either parent, meaning an affected parent has a 50% probability of passing the condition to each child. Autosomal recessive conditions require both gene copies to carry mutations; two carrier parents face a 25% chance of an affected child in each pregnancy.
What does a cytogenetic locus like '7q31.2' mean?
A cytogenetic locus designates the chromosome address: '7' refers to chromosome 7, 'q' denotes the long arm ('p' is short arm), '31' is region 3 band 1, and '.2' indicates sub-band 2.
Can this tool diagnose a genetic disorder?
No. This tool is strictly an educational reference and does not provide clinical diagnoses. Confirmatory testing and personalized risk assessments must always be conducted through a board-certified medical geneticist or licensed genetic counselor.
What is a carrier screening test?
A carrier screening test is a genetic blood or saliva test that identifies whether a person carries a pathogenic variant for an autosomal recessive or X-linked disorder, commonly performed prior to or during pregnancy.