Abstract
Background
Severe hypertension may be a prominent manifestation of complement-mediated thrombotic microangiopathy. Furthermore, patients with severe hypertension-associated thrombotic microangiopathy may present with concurrent hematologic abnormalities that mimic complement-mediated thrombotic microangiopathy. Whether or not severe hypertension-associated thrombotic microangiopathy is associated with genetic susceptibility in complement- and/or coagulation-pathway genes remains unclear, and there is thus a need to identify clinicopathological clues to distinguish between these entities.
Methods
Forty-five patients with concomitant severe hypertension and thrombotic microangiopathy on kidney biopsy were identified retrospectively. Whole-exome sequencing was performed to identify rare variants in 29 complement- and coagulation-cascade genes. Clinicopathological features were compared between patients with severe hypertension-associated thrombotic microangiopathy and complement-mediated thrombotic microangiopathy with severe hypertension.
Results
Three patients with pathogenic variants diagnostic of complement-mediated thrombotic microangiopathy and two with anti-factor H antibody positivity were diagnosed with complement-mediated thrombotic microangiopathy with severe hypertension. Among the 40 patients with severe hypertension-associated thrombotic microangiopathy, 53 rare variants of uncertain significance were found in the analyzed genes in 34 (34/40, 85%) patients, of whom 12 patients harbored two or more variants. Compared with complement-mediated thrombotic microangiopathy patients with severe hypertension, patients with severe hypertension-associated thrombotic microangiopathy were more likely to have left ventricular wall thickening (p < 0.001), less-severe acute glomerular thrombotic microangiopathy lesions including mesangiolysis and subendothelial space widening (both p < 0.001), and less arteriolar thrombosis formation (p < 0.001).
Conclusions
Rare genetic variants involving complement and coagulation pathways can be found in patients with severe hypertension-associated thrombotic microangiopathy; their role needs further investigation. Cardiac remodeling and acute glomerular TMA lesions may help to differentiate between severe hypertension-associated thrombotic microangiopathy and complement-mediated thrombotic microangiopathy with severe hypertension.
Graphical Abstract
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Availability of data and materials
All data generated or analyzed during this study are included in this published article.
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Acknowledgements
We thank Richard Robins, PhD, and Susan Furness, PhD, from Liwen Bianji (Edanz) (www.liwenbianji.cn) for editing the English text of a draft of this manuscript.
Funding
This work was supported by the National Natural Science Foundation of China (Nos. 81770671 and 82090021).
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YW conceived and designed research; XC collected and analyzed data, prepared figures and drafted manuscripts; XZ and SW reviewed kidney biopsy; MZ edited and revised manuscript; all authors approved final version.
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Chen, X., Zhang, X., Wang, Y. et al. Genetic, clinical, and pathological study of patients with severe hypertension-associated renal microangiopathy. J Nephrol 36, 2477–2490 (2023). https://doi.org/10.1007/s40620-023-01644-6
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DOI: https://doi.org/10.1007/s40620-023-01644-6