Malaria Introduction Daniel Aaen Hansen October 8, 2010 Center for Biological Sequence Analysis Technical University of Denmark.

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Presentation transcript:

Malaria Introduction Daniel Aaen Hansen October 8, 2010 Center for Biological Sequence Analysis Technical University of Denmark

Malaria - a serious problem 243 million cases / 863,000 deaths in 2008 Only matched by HIV (2.1 mill. deaths (2007)) and TB (1.6 mill. deaths (2005)) Most victims are children under the age of 5 in sub-Saharan Africa Source: WHO

Malaria Caused by a parasite of the genus Plasmodium, mainly: Plasmodium falciparum (Africa) Plasmodium vivax (Asia and America) Transferred to humans by a mosquito of the genus Anopheles Drug resistance is a major problem for treatment Sources: WHO and Centers for Disease Control and Prevention (CDC)

Prevention Source: WHO

Malaria - Life cycle Sources: Miller, Nature, 2002 and CDC

Infected Red Blood Cells Source: scienceblogs.com

Malaria - immunological targets Sources: Miller, Nature, 2002 and Malaria Vaccine Initiative (MVI)

Pathogenicity PfEMP1 Source: Miller, Nature, 2002

Pathogenicity PfEMP1 Source: Miller, Nature, 2002

Blood stage parasites

PfEMP1 variant antibodies Source: Miller, Nature, 2002

PfEMP1 variant antibodies Source: Miller, Nature, 2002 Encoded by the var gene family The Plasmodium falciparum genome contains ~60 copies of the var gene Extremely diverse

PfEMP1 domain structure Source: Adapted from Wahlgren et al (sites.huji.ac.il/malaria/maps/PfEMP1.html)

Pregnancy associated malaria (PAM) Maternal anaemia and death (~10,000 cases/year in Africa) Perinatal deaths (~200,000 cases/year in Africa) Spontaneous abortion Stillbirth Premature delivery In some endemic regions, 40% of all newborns have low birth weight caused by PAM Sources: Greenwood BM (2005), WHO

Pregnancy associated malaria (PAM) Caused by PfEMP1 binding to CSA in placenta PfEMP1 variant: VAR2CSA Source: Miller, Nature, 2002

Pregnancy associated malaria (PAM) Caused by PfEMP1 binding to CSA in placenta IgG against CSA-binding infected red blood cells (iRBC) protects against low birth weight and maternal anaemia = vaccine possible Source: Miller, Nature (2002), Staalsoe T (2004)

PfEMP1: VAR2CSA Upregulated in iRBC adhering to CSA and in placental isolates Highly conserved between falciparum strains compared to most other var genes (nucleotide sequence diversity is %) Sources: Salanti A ( ), Ndam (2005), Kraemer SM (2003)