• Ei tuloksia

The combination of genetic risk score to a currently used set of predictors

has been shown to improve the accuracy in prediction of type II diabetes.273 Genetic risk prediction has been long studied in cardiovascular disease,274 and more recently the genetic risk scores have been invited to the clinic.275 Another important implication is the advance in the pathophysiological knowledge of AKI.271 In Study II, the replication of the results of a

hypothesis-ˆ”‡‡•–—†›Ž‡†–‘–Š‡ϐ‹†‹‰–Šƒ–ƒ’‘’–‘•‹•Ǧ”‡Žƒ–‡†‰‡‡•‹‰Š–Šƒ˜‡ƒ”‘Ž‡

in AKI development in critically ill patients in septic shock. Moreover, the …‘–”ƒ†‹…–‹‰ϐ‹†‹‰‹–—†›”‡‰ƒ”†‹‰–Š‡HMOX1-repeat allele-length underlines the distinct pathophysiological mechanisms between different AKI sub-phenotypes.

A far-fetched clinical implication is gene therapy where the defective or missing gene is replaced by a functional copy.271 It is not in use for AKI, however experimental models exist. In a murine model of ischemia-reperfusion damage to the kidney, it was found that transfection of the BCL2 gene modulated necrotic and apoptotic pathways and thus reduced the damage.276

Importantly, a more practical clinical implication would be the use of genetic information in individually designing pharmacological treatment.271 In pharmacogenetics, the variability of drug response is analyzed according to genotype. An example is the degradation of catecholamines, which is suggested to be affected by genotype. Genetic variants in PNMT and COMT have been studied in association with AKI,172,178,182,191 and these variants associate with elevated endogenous noradrenalin. In the critically ill, synthetic catecholamines such as noradrenalin are frequently used

–‘ •—’’‘”– ‘”‰ƒ ˆ—…–‹‘Ǥ Š‡ ‘™Ž‡†‰‡ ‘ˆ –Š‡ ‰‡‘–›’‡ ‹ϐŽ—‡…‹‰

catecholamine metabolism and possible desensitization might aid in the selection of other vasopressors to be used, such as angiotensin II.277

6.7 FUTURE PERSPECTIVES

In the future, a hypothesis-free genome-wide genetic association study in a large cohort of critically ill patients is warranted. However, as

•—‰‰‡•–‡†„›‡•’‡…‹ƒŽŽ›–Š‡ϐ‹†‹‰•‘ˆ–—†‹‡•Ȃǡ…ƒ”‡ˆ—Ž†‹•–‹…–‹‘

of the phenotype of interest is essential. It appears that the predisposing factors are different in the sub-phenotypes of septic and cardiac-surgery-associated AKI. Within an AKI sub-phenotype, a sample large enough to

ƒ…Š‹‡˜‡•—ˆϐ‹…‹‡–’‘™‡”–‘†‡–‡…–ƒƒ••‘…‹ƒ–‹‘ƒ›‡‡†–Š‡…‘„‹ƒ–‹‘

of data from several databases.

In the genetically isolated Finnish population, the multiple population

„‘––Ž‡‡…• Šƒ˜‡ ‹ϐŽ—‡…‡† –Š‡ ƒ–—”‡ ‘ˆ ‰‡‡–‹… ˜ƒ”‹ƒ…‡Ǥ ‡…ƒ—•‡ ‘ˆ

increased drift and reduced selective pressure, potentially deleterious variants may be enriched and present at higher frequencies.278 Finns have few rare variants (minor allele frequency less than 0.5%) and an abundance

of low-frequency variants (minor allele frequency 2 to 5 %) compared to other populations.278 These unique features may aid in the discovery of causal variants in association with complex traits,278 such as AKI.

A large national FinnGen research initiative aims to gather the genomic

•ƒ’Ž‡• ‘ˆ ͷͲͲԝͲͲͲ ‹• „› –Š‡ ›‡ƒ” ʹͲʹ͵ ȋŠ––’•ǣȀȀ™™™Ǥϐ‹‰‡Ǥϐ‹ȀȌǤ As a UK Biobank initiative, this project is anticipated to advance the understanding of genomic variation in relation to health and disease.

Using a hypothesis-free study design such as GWAS has many advantages. The main goal of GWAS is to advance the understanding of the pathophysiology of a given disease to advance prevention or treatment. Even if the association between a variant at a locus and a trait is not explanatory for the mechanism, novel technology has advanced this understanding.279 ϐ‹†‹‰• Šƒ˜‡ ”‡•—Ž–‡† ‹ †‡ϐ‹‹‰ –Š‡ ”‘Ž‡ ‘ˆ ‰‡‡• ‹ †‹•‡ƒ•‡ǡ predicting the risk for a trait, as well as in the study of population genetics.

However, certain conditions must be taken in to account in order to draw …‘…Ž—•‹‘•Ǥ‡˜‡”ƒŽ–Š‹‰•ƒ”‡…‘•‹†‡”‡†ˆ‘”•—ˆϐ‹…‹‡–’‘™‡”ǡ‹…Ž—†‹‰ǣ the experimental sample size; the genetic architecture linking effect size to allele frequency of a variant at a locus; the number of those variants affecting the studied trait; the heterogeneity of the studied trait; and the panel of variants used in the GWAS.279 Some challenges persist, such as new

‹†‡–‹ϐ‹‡†Ž‘…‹™‹–Š•ƒŽŽ‡”‡ˆˆ‡…–•‹œ‡•‘”™‹–Š˜‡”›Ž‘™ˆ”‡“—‡…‹‡•ǡƒ•–Š‡

sample sizes grow ever larger.279 GWAS is a tool that by utilizing robust methodology yields highly replicable results.280 As it is very cost effective, GWAS will remain as the main instrument for discovering variation in association to complex traits for the time being.279,280 However, phenotype predictability with GWAS remains very low280,281 and still larger studies

ƒ•™‡ŽŽƒ•‹’”‘˜‡†‡–Š‘†•ƒ”‡‡‡†‡†–‘ˆƒ…‹Ž‹–ƒ–‡‰‡‡–‹…’”‘ϐ‹Ž‹‰‘ˆ

individuals at risk.280

Š‡†‡ϐ‹‹–‹‘‘ˆǡ‹ƒŽŽ–Š‡•—„Ǧ’Š‡‘–›’‡•ǡ…—””‡–Ž›”‡Ž‹‡•—’‘

’Žƒ•ƒ…”‡ƒ–‹‹‡ƒ†—”‹‡‘—–’—–ǤŠ—•ǡ‹•†‡ϐ‹‡†„›Ž‘••‘ˆˆ—…–‹‘

and in fact indicating impairment rather than injury. Performing these tests causes a delay in discovery of AKI. There is a pressing need for more accurate diagnostic tools to better identify the phenotype of interest.

ƒ•‡†‘–Š‡ϐ‹†‹‰•‘ˆ–—†‹‡•Ȃǡ‹–ƒ’’‡ƒ”•–Šƒ––Š‡‰‡‡–‹…˜ƒ”‹ƒ–•

in SERPINA4 and SERPINA5 carry the most evidence of association with AKI. These two protective variants within apoptosis-related genes were successfully replicated in association with AKI in Study II. However, the functions of these variants are unknown. In the future, research is needed about the potential role these variants in AKI susceptibility.

In presenting association of a genetic variant with AKI there is an

6 Epigenetic regulation of gene expression is a mechanism that does

not change the nucleotide sequence but induces changes to a phenotype

„›Š‹•–‘‡‘†‹ϐ‹…ƒ–‹‘•ǡ‡–Š›Žƒ–‹‘ǡƒ†˜‹ƒ‘Ǧ…‘†‹‰•Ǥ282 These changes, although partly heritable, are potentially reversible and affected by environmental factors. It is suggested that an overall increase in histone acetylation would protect from AKI and shift the kidney toward regeneration; however, the precise mechanisms remain unknown.282

Genetic research has provided an advanced instrument in gaining understanding of the pathogenesis of many clinical conditions, as well as the possibilities of precision medicine in providing more individualized approaches to treatment of disease. The ongoing research into genetic and

‡’‹‰‡‡–‹…’”‡†‹•’‘•‹–‹‘ˆ‘”‹•˜‹‰‘”‘—•Ǥ‹–Š™‡ŽŽǦ†‡ϐ‹‡†’Š‡‘–›’‡•

of critical-care syndromes, the study of genetic variation will reveal the

‹†‹˜‹†—ƒŽˆ‡ƒ–—”‡•–Šƒ–‹ϐŽ—‡…‡†‹•‡ƒ•‡‘•‡–ƒ†’”‘‰”‡••‹‘Ǥ‹–Š–Š‹•

information, more individualized care can be designed for patients with risk or established AKI, who are equally entitled to adequate intervention, regardless of their genotype.

7 CONCLUSIONS

1. Based on the systematic review of the literature no conclusive evidence exists about the genetic predisposition to AKI.

Studies with larger sample size and better standardized AKI

†‡ϐ‹‹–‹‘ ƒ”‡ ‡‡†‡† –‘ ‰ƒ‹ …‘…Ž—•‹˜‡ ‡˜‹†‡…‡ ‘ˆ ‰‡‡–‹…

predisposition to AKI.

2. The published genetic studies were heterogeneous and of inadequate quality.

3.

3.1. In critically ill adult patients with septic shock, the variants rs2093266 in the SERPINA4 and rs1955656 in the SERPINA5 were associated with the development of severe AKI, implying an apoptotic pathway in this phenotype of AKI.

3.2. In critically ill patients with sepsis, the short allele of promoter repeat polymorphism of HMOX1 was associated with development of severe AKI.

3.3. ‡•–‡† ‰‡‡–‹… ˜ƒ”‹ƒ–• ™‹–Š‹ ʹ͹ ‹ϐŽƒƒ–‘”› ‰‡‡•

did not associate with development of severe or all-stage AKI in critically ill patients. The variants did not associate with the outcome in subgroups of septic or cardiac surgery cohorts.

7, 8

8 ACKNOWLEDGEMENTS

This study was carried out at the Helsinki University Central Hospital, Department of Anesthesiology and Intensive Care Medicine in the years 2011 through 2019. The study was part of the national multicenter FINNAKI study that included patients in 17 Finnish ICUs. I want to express my deepest gratitude to all of the study participants and the entire FINNAKI Study Group, who made this thesis possible. I am very thankful for ϐ‹ƒ…‹ƒŽ•—’’‘”–ˆ”‘–Š‡‘•’‹–ƒŽ†‹•–”‹…–‘ˆ‡Ž•‹‹ǡ–Š‡ ‹‹•Š‘…‹‡–›

of Anesthesiologists, the Finnish Kidney Foundation, and the University of Helsinki.

I most sincerely thank the supervisors of this thesis, docent Mari Kaunisto and professor Ville Pettilä. They have provided me with insightful guidance and extremely achievable support throughout this project. Due to Ville’s productiveness, exceptional research skills, and substantial knowledge about AKI my thesis project has been very forward driven. I am extremely fortunate to have been supervised by Mari, who is a true expert in genetics of complex traits, as well as an inspiring mentor. Indeed, I got to learn from the best.

I want to express my deepest gratitude to docent Tarja Kunnas and docent Satu Mäkelä for reviewing this thesis. Their precise work, sensible observations, and supportive comments were extremely valuable. I am most grateful to professor Klaus Olkkola and docent Tarja Randell, who have welcomed me in the clinical training program in anesthesiology and encouraged my research work. Members of the monitoring group of the thesis, docent Marjo Avela and professor Juha Sinisalo, are gratefully acknowledged.

I owe a special thanks to information specialist Katri Larmo for assistance in performing literature searches, and to Dr Jennifer Rowland for ϐ‹”•–Ǧ…Žƒ••Žƒ‰—ƒ‰‡‡†‹–‹‰Ǥ•‘Ž‹…‹–—Šƒ‹‹–¡‡ˆ‘”ƒ†˜‹…‡‹‰”ƒ’Š‹…• drawing, as well as excellent layout and cover design of this thesis.

Without the hands-on advice from docent Suvi Vaara I would not have any results to share. Her data-management skills are extraordinary, and she is most hard-working and ingenious researcher, who I truly look up to.

I am grateful to Meri Poukkanen, MD, PhD, and Sara Nisula, MD, PhD, for their excellent work in the FINNAKI project.

—•––Šƒ†‘…‡–¡‹˜‹ƒ‹•–‘ƒ††‘…‡–ƒ–‹‘‡”ˆ‘”ϐŽ‡š‹„Ž‡

and innovative co-operation in cowriting. My heartfelt thanks go to the laboratory specialists Anu Yliperttula, Hanna-Maria Nieminen, and Essi Kaiharju for giving me the basic knowledge about DNA sample processing.

I am deeply thankful to research coordinators Sari Sutinen and Leena Pettilä for helping me out at all times. I want to thank Iris Renken, MD,

ˆ‘” •Šƒ”‹‰ ƒ ‘ˆϐ‹…‡ ƒ† ƒ …‘‘ ‹–‡”‡•–ǡ „—– ‘”‡ ‹’‘”–ƒ–Ž› ˆ‘”

asking such good questions. I am in gratitude to research secretary Taina Vuorenmaa, who has managed the practical aspects of research work.

I praise my good friends Nelli, Heli, Harriet, Eija, Hertta, and Pia, who have supported me throughout this project. At the face of all challenges and enormous life changes I have been allowed to be myself in your presence;

thank you! Most humbly I thank my mother and my in-laws for helping out without question. Because of your assistance I have been able to pursue

›•…‹‡–‹ϐ‹…ƒ„‹–‹‘•ƒŽ‘‰•‹†‡›ˆ‘—†‹‰ƒˆƒ‹Ž›Ǥ

Finally, I have the opportunity to thank my family. My dear Markus, I am certain no one else would have been as loving, and as tolerant towards my constant requests for time for “nakki”. You have bravely stood beside me and endorsed me in times of doubt. Beloved Niilo and Veera, thank you for bringing joy and purpose to life. I am most proud to be your mother.

Helsinki, October 2019

Laura M. Vilander

8, 9

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