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. 2020 Aug;13(4):e002836.
doi: 10.1161/CIRCGEN.119.002836. Epub 2020 Jun 30.

De Novo Damaging Variants, Clinical Phenotypes, and Post-Operative Outcomes in Congenital Heart Disease

Affiliations

De Novo Damaging Variants, Clinical Phenotypes, and Post-Operative Outcomes in Congenital Heart Disease

Marko T Boskovski et al. Circ Genom Precis Med. 2020 Aug.

Abstract

Background: De novo genic and copy number variants are enriched in patients with congenital heart disease, particularly those with extra-cardiac anomalies. The impact of de novo damaging variants on outcomes following cardiac repair is unknown.

Methods: We studied 2517 patients with congenital heart disease who had undergone whole-exome sequencing as part of the CHD GENES study (Congenital Heart Disease Genetic Network).

Results: Two hundred ninety-four patients (11.7%) had clinically significant de novo variants. Patients with de novo damaging variants were 2.4 times more likely to have extra-cardiac anomalies (P=5.63×10-12). In 1268 patients (50.4%) who had surgical data available and underwent open-heart surgery exclusive of heart transplantation as their first operation, we analyzed transplant-free survival following the first operation. Median follow-up was 2.65 years. De novo variants were associated with worse transplant-free survival (hazard ratio, 3.51; P=5.33×10-04) and longer times to final extubation (hazard ratio, 0.74; P=0.005). As de novo variants had a significant interaction with extra-cardiac anomalies for transplant-free survival (P=0.003), de novo variants conveyed no additional risk for transplant-free survival for patients with these anomalies (adjusted hazard ratio, 1.96; P=0.06). By contrast, de novo variants in patients without extra-cardiac anomalies were associated with worse transplant-free survival during follow-up (hazard ratio, 11.21; P=1.61×10-05) than that of patients with no de novo variants. Using agnostic machine-learning algorithms, we identified de novo copy number variants at 15q25.2 and 15q11.2 as being associated with worse transplant-free survival and 15q25.2, 22q11.21, and 3p25.2 as being associated with prolonged time to final extubation.

Conclusions: In patients with congenital heart disease undergoing open-heart surgery, de novo variants were associated with worse transplant-free survival and longer times on the ventilator. De novo variants were most strongly associated with adverse outcomes among patients without extra-cardiac anomalies, suggesting a benefit for preoperative genetic testing even when genetic abnormalities are not suspected during routine clinical practice. Registration: URL: https://www.clinicaltrials.gov. Unique identifier: NCT01196182.

Keywords: congenital heart disease; genomics; heart transplantation; mortality; survival.

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Conflict of interest statement

None.

Figures

Figure 1.
Figure 1.
Description of study population. A, Flow chart depicting the derivation of the study population. B, Comparison of patients with and without available surgical data. Surgical data were not available for patients who underwent surgery before the treatment center began collecting data. Damaging genic variants (DGVs) include only those that are clinically significant (occur in multi-hit genes; see Methods in the Data Supplement). DND indicates de novo damaging.
Figure 2.
Figure 2.
Kaplan-Meier curves depicting (A) time to death or heart transplantation following first open-heart surgery and (B) time to final extubation following open-heart surgery for congenital heart disease patients with and without de novo damaging variants (includes only clinically significant damaging genic variants [DGVs]). Adjusted hazard ratios (HR) are shown.
Figure 3.
Figure 3.
Interaction between de novo damaging variants and extra-cardiac anomalies (ECA) in their association with transplant-free survival and time to final extubation. A, Models for transplant-free survival and time to final extubation that include interaction between DND variants and ECAs. Analyses include only clinically significant damaging genic variants (DGVs). There was a significant interaction between the 2 for transplant-free survival. Among patients without ECAs, de novo damaging variants were associated with worse transplant-free survival, but there was no significant association among patients with ECAs. For time to final extubation, both de novo damaging variants and ECAs were independently associated with worse outcome without interaction between the 2. B and C, Kaplan-Meier curves depicting time to death or heart transplantation following first open-heart surgery for patients with and without ECAs. Adjusted hazard ratios (HR) are shown. STAT indicates Society of Thoracic Surgeons-European Association for Cardio-Thoracic Surgery.
Figure 4.
Figure 4.
Identification and validation of high-risk de novo damaging variants. Permutation analyses identified de novo copy number variants at 15q25.2 and 15q11.2 as high-risk for transplant-free survival (A) and 15q25.2, 22q11.21, and 3p25.1-26.3 as high-risk for prolonged time to final extubation (B). C, Kaplan-Meier curves depicting time to death or heart transplantation after first open-heart surgery in congenital heart disease (CHD) patients with high-risk de novo damaging variants (15q25.2 and 15q11.2), any other de novo damaging variants, and no de novo variants. D, Kaplan-Meier curves depicting time to final extubation after open-heart surgery in patients with high-risk de novo damaging variants (15q25.2, 22q11.21, and 3p25.1-26.3), other de novo damaging variants and no de novo variants. Adjusted hazard ratios (HR) are shown.

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