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About me

I am a biologist trained at the Universtiy of Uppsala during the 1990's.  My research focus on understanding genetic susceptibility and predisposition. Things like:

  • Fundamental aspects of the twin model
  • Heritability, variance partitioning
  • Large scale gene mapping for complex disease and other traits
  • Genetic susceptibility and predisposition
  • Epigenetics

Leading the Swedish Twin Registry (STR)

I am in charge of the Swedish Twin Registry with responsibility for data/sample collection, handling of research applications, data withdrawals and research collaborations. I am also chair of the STR Steering Committee. The epidemiologic and genetic data available in the STR are utilized in studies of a large number of diseases and health related traits by various groups in Sweden and abroad.


  • MSc, Natural Sciences, Uppsala University (1995)
  • PhD, Medical Genetics, Uppsala University (2000)
  • Postdoc, Columbia University, New York (2002)

Research description

Selected publications

Comparison of heritability of Cystatin C- and creatinine-based estimates of kidney function and their relation to heritability of cardiovascular disease.
Arpegård J, Viktorin A, Chang Z, de Faire U, Magnusson P, Svensson P
J Am Heart Assoc 2015 Jan;4(1):e001467

Mutagenesis. Smoking is associated with mosaic loss of chromosome Y.
Dumanski J, Rasi C, Lönn M, Davies H, Ingelsson M, Giedraitis V, et al
Science 2015 Jan;347(6217):81-3

The risk of switch to mania in patients with bipolar disorder during treatment with an antidepressant alone and in combination with a mood stabilizer.
Viktorin A, Lichtenstein P, Thase M, Larsson H, Lundholm C, Magnusson P, et al
Am J Psychiatry 2014 Oct;171(10):1067-73

IgA measurements in over 12 000 Swedish twins reveal sex differential heritability and regulatory locus near CD30L.
Viktorin A, Frankowiack M, Padyukov L, Chang Z, Melén E, Sääf A, et al
Hum. Mol. Genet. 2014 Aug;23(15):4177-84

Methylome-wide association study of schizophrenia: identifying blood biomarker signatures of environmental insults.
Aberg K, McClay J, Nerella S, Clark S, Kumar G, Chen W, et al
JAMA Psychiatry 2014 Mar;71(3):255-64

Utilizing twins as controls for non-twin case-materials in genome wide association studies.
Ganna A, Ortega-Alonso A, Havulinna A, Salomaa V, Kaprio J, Pedersen N, et al
PLoS ONE 2013 ;8(12):e83101

Multifactorial analysis of changes in body mass index across the adult life course: a study with 65 years of follow-up.
Dahl A, Reynolds C, Fall T, Magnusson P, Pedersen N
Int J Obes (Lond) 2014 Aug;38(8):1133-41

Germline genetic contributions to risk for esophageal adenocarcinoma, Barrett's esophagus, and gastroesophageal reflux.
Ek W, Levine D, D'Amato M, Pedersen N, Magnusson P, Bresso F, et al
J. Natl. Cancer Inst. 2013 Nov;105(22):1711-8

Heritability and the equal environments assumption: evidence from multiple samples of misclassified twins.
Conley D, Rauscher E, Dawes C, Magnusson P, Siegal M
Behav. Genet. 2013 Sep;43(5):415-26

Clinical depression, antidepressant use and risk of future cardiovascular disease.
Rahman I, Humphreys K, Bennet A, Ingelsson E, Pedersen N, Magnusson P
Eur. J. Epidemiol. 2013 Jul;28(7):589-95

Multilocus genetic risk scores for coronary heart disease prediction.
Ganna A, Magnusson P, Pedersen N, de Faire U, Reilly M, Arnlöv J, et al
Arterioscler. Thromb. Vasc. Biol. 2013 Sep;33(9):2267-72

Genome-wide association study of susceptibility loci for cervical cancer.
Chen D, Juko-Pecirep I, Hammer J, Ivansson E, Enroth S, Gustavsson I, et al
J. Natl. Cancer Inst. 2013 May;105(9):624-33

Genetic determinants of mortality. Can findings from genome-wide association studies explain variation in human mortality?
Ganna A, Rivadeneira F, Hofman A, Uitterlinden A, Magnusson P, Pedersen N, et al
Hum. Genet. 2013 May;132(5):553-61

The Swedish Twin Registry: establishment of a biobank and other recent developments.
Magnusson P, Almqvist C, Rahman I, Ganna A, Viktorin A, Walum H, et al
Twin Res Hum Genet 2013 Feb;16(1):317-29

The genetic structure of the Swedish population.
Humphreys K, Grankvist A, Leu M, Hall P, Liu J, Ripatti S, et al
PLoS ONE 2011 ;6(8):e22547

Genetic and environmental regulation of inflammatory CVD biomarkers Lp-PLA2 and IgM anti-PC.
Rahman I, Atout R, Pedersen N, de Faire U, Frostegård J, Ninio E, et al
Atherosclerosis 2011 Sep;218(1):117-22

Current supervision of PhD students

Main supervisor


Teaching portfolio

I am docent since 2011 and gives regular lectures in the Medical program and Psychology program at KI and also teach occasionally in Stockholm University and Uppsala university. Pedagogically I am most proud about my contribution to the KI graduate course "Genetic Epidmiology" for which I have been resposible since 2009.

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