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Cardiovascular Disorders

19 conditions|12 ABGC-listed

Overview

Cardiovascular genetics can be divided into cardiac conditions (affecting the heart muscle, valves, conduction system, and structure) and vascular conditions (affecting arteries and blood vessels). The diagram below organizes the major categories, genes, and conditions in this chapter.

Cardiovascular genetics overview
Cardiovascular genetics overview

Key themes:

  • Aortopathies: TGF-β signaling pathway (Marfan, Loeys-Dietz)
  • RASopathies: RAS-MAPK pathway (Noonan, Costello, CFC)
  • Congenital heart disease: Structural heart defects (Holt-Oram)
  • Arrhythmias: Ion channel genes (LQTS, CPVT, Brugada)
  • Cardiomyopathies: Sarcomeric proteins (HCM, DCM) or desmosomal proteins (ARVC)

Congenital heart disease

While most congenital heart disease is multifactorial, some syndromes feature CHD as a cardinal finding. Holt-Oram (TBX5) is the classic "heart-hand syndrome," presenting with upper limb defects (radial ray) plus septal defects.

Cardiomyopathies

Cardiomyopathies are classified by structure/function: HCM (thick walls, sarcomeric genes), DCM (dilated, thin walls, TTN/LMNA), ARVC (RV fibrofatty replacement, desmosomal genes), and RCM (stiff/restrictive). HCM is the leading cause of sudden death in young athletes. LMNA-related DCM needs early ICD consideration due to arrhythmia risk.

Vascular disorders

Hereditary hemorrhagic telangiectasia (HHT/Osler-Weber-Rendu) is the key vascular genetic disorder. It causes arteriovenous malformations (AVMs) in the lungs, brain, and liver, plus mucocutaneous telangiectasias and recurrent epistaxis. Two main genes: ENG (HHT1, more pulmonary AVMs) and ACVRL1 (HHT2, more hepatic AVMs). Screen for pulmonary AVMs with contrast echocardiography: untreated pulmonary AVMs can cause stroke or brain abscess via paradoxical embolism.

Summary Table

DisorderGeneInheritanceKey Features
MarfanFBN1ADEctopia lentis, aortic root dilation
Loeys-DietzTGFBR1/2ADBifid uvula, arterial tortuosity
Familial TAADACTA2, MYH11, SMAD3ADNon-syndromic aortic aneurysm/dissection
NoonanPTPN11ADPulmonary stenosis, webbed neck
NSML (LEOPARD)PTPN11 (dom-neg)ADLentigines, HCM, sensorineural deafness
CostelloHRASADPapillomata, HCM, tumor risk
CFCBRAF, MAP2K1/2ADSparse curly hair, hyperkeratosis, severe ID
Holt-OramTBX5ADASD, radial ray defects
LQTSKCNQ1ADProlonged QTc, syncope
Andersen-Tawil (LQT7)KCNJ2ADPeriodic paralysis, bidirectional VT, dysmorphism
BrugadaSCN5AADType 1 coved ST elevation V1-V3, SCD, fever trigger
CPVTRYR2ADExercise-induced VT
HCMMYH7ADLV hypertrophy, sudden death
DCMTTNADLV dilation, heart failure
ARVCPKP2ADRV fibrofatty change, VT
RCMTNNI3, DES, TTRVariableDiastolic dysfunction, biatrial enlargement
ATTR amyloidosisTTRADPolyneuropathy, restrictive CM, vitreous opacities
HHTENG, ACVRL1ADTelangiectasias, AVMs, epistaxis
Heritable PAHBMPR2AD (low penetrance)Progressive dyspnea, right heart failure