Abstract
In kidney transplantation, the use of minimally invasive damage biomarkers that are more sensitive and specific than plasma creatinine will be crucial to enable early, actionable detection or exclusion of structural kidney damage due to acute or chronic rejection. Donor-derived cell-free DNA (dd-cfDNA), which can be quantified, for example, through next-generation sequencing, droplet digital PCR and quantitative PCR, is a candidate biomarker with great potential for enabling comprehensive monitoring of allograft injury. dd-cfDNA has a favourable overall diagnostic performance for the detection of rejection and its high negative predictive value might be especially useful for avoiding unnecessary biopsies. Elevated dd-cfDNA levels have been shown to be detectable before graft injury can be clinically identified using current diagnostic methods. Moreover, dd-cfDNA falls rapidly to baseline levels after successful treatment for rejection owing to its short half-life. dd-cfDNA can detect graft injury caused by immune activation owing to insufficient immunosuppression and might therefore also help guide immunosuppression dosing. The fractional abundance of dd-cfDNA can be affected by changes in the recipient cfDNA (for example, due to infection or physical exercise) but the use of absolute quantification of dd-cfDNA overcomes this limitation. Serial dd-cfDNA determinations might therefore facilitate cost-effective personalized clinical management of kidney transplant recipients to reduce premature graft loss.
Key points
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Novel approaches that can improve the detection, monitoring and treatment of graft injury, especially due to rejection, are crucially needed in kidney transplantation.
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Plasma creatinine is an insensitive, non-specific and delayed graft injury biomarker as detectable increases generally only occur 24–48 hours after injury; immunosuppressive drug monitoring can also predict potential toxicity but is not a biomarker of graft damage.
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Donor-derived cell-free DNA (dd-cfDNA) has been shown to be a useful biomarker for comprehensive monitoring of allograft injury that overcomes the limitations of traditional approaches.
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Serial dd-cfDNA determinations can suggest or rule out acute and chronic rejection, as well as other graft injuries, early, avoiding unnecessary biopsies.
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dd-cfDNA determination allows detection of under-immunosuppression and is therefore useful for guiding immunosuppression minimization.
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As a biomarker, dd-cfDNA has the potential to enable cost-effective close surveillance of transplant recipients to decrease both re-transplantation and premature graft loss.
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M.O. acts as consultant and scientific advisor to Chronix Biomedical and Liquid Biopsy Center (LBC) GmbH. E.S. and J.B. are employees of and own stock and intellectual property rights at Chronix Biomedical. P.D.W. receives reimbursement to travel from Hannover to University Medical Center Goettingen from the Liquid Biopsy Center (LBC) GmbH. The other authors declare no competing interests.
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Glossary
- Class switching
-
A biological mechanism by which antibody isotypes change following B cell activation; each antibody isotype (IgA, IgD, IgE, IgG and IgM) has distinct properties and biological functions.
- Affinity maturation
-
A biological mechanism by which antibodies produced by activated B cells develop increasing affinity for a specific antigen following repeated exposures to the antigen.
- Antigen spreading
-
A mechanism by which the diversity of epitope recognition increases to enable broader antigen recognition during the immune response (also known as epitope spread or antigen cascade).
- SNP-chip technology
-
A technology that uses immobilized probes and fluorescent labels to obtain genotypes for a large number of single-nucleotide polymorphisms (SNPs).
- Shallow sequencing
-
A method of next-generation sequencing that produces a relatively low read number per sample resulting in a lower coverage than ‘deep’ sequencing methods.
- Minor allele population frequency
-
The frequency of uncommon alleles in a population.
- Limit of quantification
-
The lowest or highest analyte concentration at which the measurement procedure fulfils specifications for precision and accuracy.
- Dynamic range
-
The range between the lower and upper limit of quantification
- Limit of blank
-
The highest apparent analyte concentration obtained from measuring replicates of a sample without analyte.
- Limit of detection
-
The smallest detectable amount of an analyte.
- Bayesian approach
-
An approach to test result interpretation that takes the pre-test probability into account.
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Oellerich, M., Sherwood, K., Keown, P. et al. Liquid biopsies: donor-derived cell-free DNA for the detection of kidney allograft injury. Nat Rev Nephrol 17, 591–603 (2021). https://doi.org/10.1038/s41581-021-00428-0
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DOI: https://doi.org/10.1038/s41581-021-00428-0
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