Medical genetics — care, reference and tools

Medical Genetics is a medical specialty focused on the diagnosis, management, and counseling related to hereditary conditions and genetic disorders. It encompasses the study of chromosomal abnormalities, single-gene (Mendelian) disorders, and complex multifactorial diseases.

You should seek a clinical geneticist if you have a personal or family history of congenital malformations, intellectual disability, multiple miscarriages, hereditary cancers, or any condition where a genetic etiology is suspected. Early genetic evaluation is also critical for newborns with abnormal screening results.

The field is broadly divided into: Clinical Genetics (dysmorphology, syndrome diagnosis), Molecular Genetics (DNA-level analysis, NGS, gene panels), Cytogenetics (chromosomal analysis via karyotype, FISH, Chromosomal Microarray), Biochemical Genetics (inborn errors of metabolism, enzyme assays), and Cancer Genetics (hereditary cancer syndromes, somatic tumor profiling).

Each subspecialty uses distinct diagnostic tools but they are increasingly integrated through comprehensive genomic platforms that provide a unified clinical picture.

Next-Generation Sequencing (NGS) allows for the simultaneous analysis of thousands of genes, drastically reducing diagnostic odysseys. Key applications include: (1) Whole Exome Sequencing (WES): the protein-coding regions of all ~20,000 genes; (2) Whole Genome Sequencing (WGS): a complete view including non-coding regulatory regions; (3) Gene Panels: targeted analysis of specific gene sets.

The interpretation pipeline involves variant calling, annotation against databases (ClinVar, gnomAD), and careful phenotype–genotype correlation.

Epigenetics studies heritable changes in gene expression that do not involve alterations to the DNA sequence itself — DNA methylation, histone modification, and non-coding RNA regulation.

Clinically, epigenetic signatures diagnose imprinting disorders (e.g., Prader-Willi, Angelman), classify tumors by methylation profile, and explain how environmental factors influence gene expression across generations. It bridges genotype and phenotype.

This subspecialty focuses on genetic risk assessment during family planning and pregnancy: Non-Invasive Prenatal Testing (NIPT), carrier screening, and invasive diagnostics (CVS / amniocentesis).

Our approach is deeply guided by a personalist bioethical framework, respecting the inherent dignity of all human life while providing parents with comprehensive, transparent medical information to support informed decisions.

Pharmacogenomics uses your unique genetic profile (specifically CYP450 enzymes) to predict drug metabolism, selecting the right drug at the right dose.

It is critical in Psychiatry (antidepressants), Cardiology (anticoagulants) and Oncology, moving practice away from 'trial and error' and reducing Adverse Drug Reactions.

Modern Medical Genetics extends beyond diagnosis into treatment: (1) Gene Therapy — viral vectors or CRISPR to correct defects; (2) Chaperone Therapy — stabilising misfolded proteins; (3) Small-Molecule Therapies — read-through of nonsense mutations or RNA-splicing modulation. These represent the vanguard of translational medicine.

A paradigm shift from reactive treatment to proactive risk mitigation. 'Previvors' carry a genetic predisposition but have not developed disease. Using Polygenic Risk Scores (PRS) with traditional clinical factors, we quantify susceptibility to complex conditions and create individualized surveillance and lifestyle protocols to prevent or delay onset.