Clinical heterogeneity of Pulmonary Arterial Hypertension associated with variants in TBX4

Ignacio Hernandez-Gonzalez, Jair Tenorio,Julian Palomino-Doza, Amaya Martinez Meñaca, Rafael Morales Ruiz,Mauro Lago-Docampo, María Valverde Gomez, Javier Gomez Roman, Ana Belén Enguita Valls, Carmen Perez-Olivares, Diana Valverde, Joan Gil Carbonell, Elvira Garrido-Lestache Rodríguez-Monte, Maria Jesus del Cerro,Pablo Lapunzina, Pilar Escribano-Subia

Received: November 24, 2019; Accepted: April 9, 2020; Published: April 29, 2020

Abstract

Background

The knowledge of hereditary predisposition has changed our understanding of Pulmonary Arterial Hypertension. Genetic testing has been widely extended and the application of Pulmonary Arterial Hypertension specific gene panels has allowed its inclusion in the diagnostic workup and increase the diagnostic ratio compared to the traditional sequencing techniques. This is particularly important in the differential diagnosis between Pulmonary Arterial Hypertension and Pulmonary Venoocclusive Disease.

Methods

Since November 2011, genetic testing is offered to all patients with idiopathic, hereditable and associated forms of Pulmonary Arterial Hypertension or Pulmonary Venoocclusive Disease included in the Spanish Registry of Pulmonary Arterial Hypertension. Herein, we present the clinical phenotype and prognosis of all Pulmonary Arterial Hypertension patients with disease-associated variants in TBX4.

Results

Out of 579 adults and 45 children, we found in eight patients from seven families, disease-causing associated variants in TBX4. All adult patients had a moderate-severe reduction in diffusion capacity. However, we observed a wide spectrum of clinical presentations, including Pulmonary Venoocclusive Disease suspicion, interstitial lung disease, pulmonary vascular abnormalities and congenital heart disease.

Conclusions

Genetic testing is now essential for a correct diagnosis work-up in Pulmonary Arterial Hypertension. TBX4-associated Pulmonary Arterial Hypertension has marked clinical heterogeneity. In this regard, a genetic study is extremely useful to obtain an accurate diagnosis and provide appropriate management.

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