PhD defence - Laurine B.S. Harsløf

Laurine B.S. Harsløf is defending her PhD thesis

Determinants of DHA status and functional effects on metabolic markers and immune modulation in early life

Use of single nucleotide polymorphisms to support effects of n-3 LCPUFA

Time

20 March 2014 at 13:00

Venue

Festauditoriet, 1-01, Bülowsvej 17, 1870 Frederiksberg C

Opponents

Associate Professor, PhD, Mette Kristensen (Chair), Department of Nutrition, Exercise and Sports Faculty of Science, University of Copenhagen, Denmark

Professor, MD, PhD Berthold Koletzko Dr. von Hauner Children's Hospital Ludwig Maximilians University Munich, Germany

Senior Research Fellow, PhD Pauline Emmett School of Social and Community Health Centre for Child and Adolescent Health University of Bristol, United Kingdom

Supervisors

Associate Professor, PhD Lotte Lauritzen Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Denmark

Professor, Dr.Med.Sci. Kim Fleischer Michaelsen, Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Denmark

Professor, PhD Ulla Vogel National Research Centre for the Working Environment, Copenhagen Denmark

About the thesis

Optimal intake of n-3 long chain polyunsaturated fatty acids (LCPUFA) during infancy and early childhood is not known and only a few studies have examined to what extend docosahexaenoic acid (DHA) status is affected by endogenous synthesis from α-linolenic acid relative to the influence of dietary intake and other potential determinants in infancy and childhood.

The first part of the PhD thesis describes several potential determinants of infant and young child DHA status including genetic variation in FADS, breastfeeding and fish intake. Results can be found in Paper 1.

Evidence for effects of n-3 LCPUFA on metabolic markers such as glucose homeostasis, lipid profile and blood pressure in young children is limited. No studies have explored whether polymorphisms of genes encoding proteins involved in the mechanisms behind the effect (such as PPARG2 and COX2) can support the findings of diet studies. Furthermore, the evidence for immuno-modulatory effects of n-3 LCPUFA in childhood remain inconclusive and inclusion of genotypes of genes involved in the mechanisms behind the effects of n-3 LCPUFA (such as PPARG2, COX2 and NFKB1) may support the findings and provide evidence of possible mechanisms of action by identifying the involved pathways and genes.

The second part of the PhD thesis explores whether functional effects of n-3 LCPUFA on metabolic markers and immune maturation in young children can be supported by polymorphisms in genes involved in the mechanisms (PPARG2, COX2 and NFKB1). Results can be found in Paper 2 and 3.

2014, 146 pages, ISBN 978 87 7611 719 1