We use cookies to understand how you use our site and to improve your experience. This includes personalizing content and advertising. To learn more, click here. By continuing to use our site, you accept our use of cookies. Cookie Policy.

LabMedica

Download Mobile App
Recent News Expo ADLM 2025 Clinical Chem. Molecular Diagnostics Hematology Immunology Microbiology Pathology Technology Industry Focus

Susceptibility Gene Identified for Idiopathic Pulmonary Arterial Hypertension

By LabMedica International staff writers
Posted on 14 Apr 2020
Image: The 96-capillary 3730xl DNA Analyzer is the Gold Standard for high throughput genetic analysis and used for Sanger sequencing (Photo courtesy of Thermo Fisher Scientific)
Image: The 96-capillary 3730xl DNA Analyzer is the Gold Standard for high throughput genetic analysis and used for Sanger sequencing (Photo courtesy of Thermo Fisher Scientific)
Idiopathic pulmonary arterial hypertension (IPAH) is a lung disorder characterized by high blood pressure in the pulmonary arteries. In this instance, “idiopathic” means that the cause of the pulmonary artery hypertension is unknown.

Pulmonary arterial hypertension is rare, with about 1,000 new diagnoses in the USA each year. IPAH is a hard disorder to diagnose because some people do not have symptoms, and when there are symptoms of IPAH, they are similar to those of other heart and lung disorders.

Scientists at the Peking Union Medical College Hospital (Beijing, China) and their colleagues enrolled 230 patients with IPAH from two referral pulmonary hypertension centers in China. Eligible patients had no BMPR2 variants and were compared with 968 healthy control participants. Data were collected from January 1, 2000, to July 31, 2015, and analyzed from August 1, 2015, to May 30, 2018.

The investigators sequenced the genomes of 42 patients with IPAH, none of whom had BMPR2 variants. The team also performed whole genome sequencing (WGS), Sanger sequencing on an ABI 3730 automated sequencer (Applied Biosystems, Courtaboeuf, France), right heart catheterization, pulmonary vasodilator testing, plasmid construction, cell culture and transfection, measurement of 6-Keto–prostaglandin F1α levels using an enzyme-linked immunosorbent assay (ELISA) kit (Cayman Chemical, Ann Arbor, MI, USA).

After filtering, the scientists uncovered 1,986 rare variants affecting 1,772 candidate genes. Most of these alterations were present only in a single person, but 15 genes were altered in three or more people. Of those, PTGIS, MACF1, GTF3C1, and ABCA3 are expressed in the lung. As PTGIS encodes prostaglandin synthase, which is involved in prostaglandin production, the team suspected it might be the most relevant of those 15 genes. In a replication cohort of 188 patients with IPAH, they uncovered additional patients with PTGIS variants. In all, 14 patients harbored one of three rare PTGIS variants.

The three rare PTGIS variants: A447T, R252Q, and c.521 +1G>A, are all located in conserved regions of the gene and are predicted by in silico analysis to be deleterious. Functional studies found that the PTGIS splicing variant affects the gene's transcription, as it led to exon skipping and an in-frame deletion. The two missense variants, meanwhile, led to impaired enzyme activity, decreased prostaglandin production, and increased cell death of pulmonary microvascular endothelial cells.

The authors concluded that they had identified three rare loss-of-function variants in the PTGIS gene from two independent cohorts with IPAH. The genetic variants of PTGIS predispose pulmonary vascular responses to the iloprost stimulation. These findings suggest that PTGIS variants may be involved in the pathogenesis of IPAH. The study was published on April 1, 2020 in the journal JAMA Cardiology.

Related Links:
Peking Union Medical College Hospital
Applied Biosystems
Cayman Chemical


Gold Member
Quantitative POC Immunoassay Analyzer
EASY READER+
3-Part Differential Hematology Analyzer
Swelab Alfa Plus Sampler
New
Hand-Held Immunofluorescence Analyzer
WS-Si1500
New
Chlamydia Trachomatis Test
Aptima Chlamydia Trachomatis Assay

DIASOURCE (A Biovendor Company)

Channels

Hematology

view channel
Image: CitoCBC is the world first cartridge-based CBC to be granted CLIA Waived status by FDA (Photo courtesy of CytoChip)

Disposable Cartridge-Based Test Delivers Rapid and Accurate CBC Results

Complete Blood Count (CBC) is one of the most commonly ordered lab tests, crucial for diagnosing diseases, monitoring therapies, and conducting routine health screenings. However, more than 90% of physician... Read more

Immunology

view channel
Image: CellLENS enables the potential precision therapy strategies against specific immune cell populations in the tissue environment (Photo courtesy of MIT)

New AI System Uncovers Hidden Cell Subtypes to Advance Cancer Immunotherapy

To produce effective targeted therapies for cancer, scientists need to isolate the genetic and phenotypic characteristics of cancer cells, both within and across different tumors. These differences significantly... Read more

Technology

view channel
Image: The Check4 gene-detection platform (Photo courtesy of IdentifySensors)

Electronic Biosensors Used to Detect Pathogens Can Rapidly Detect Cancer Cells

A major challenge in healthcare is the early and affordable detection of serious diseases such as cancer. Early diagnosis remains difficult due to the complexity of identifying specific genetic markers... Read more
PURITAN MEDICAL