IRF8 Mutations and Human Dendritic-Cell Immunodefiency

Estefanía Velásquez López – Plutarco Andrés UzcateguiEstefanía Velásquez López – Plutarco Andrés UzcateguiMedicine Student´s – Third semesterMedicine Student´s – Third semester

Medellín - ColombiaMedellín - ColombiaMolecular BiologyMolecular Biology

20112011

IRF8 MUTATIONS AND HUMANDENDRITIC-CELL IMMUNODEFICIENCY

Sophie Hambleton, M.D., Ph.D., Sandra Salem, B.Sc.,Jacinta Bustamante, M.D., Ph.D., Venetia Bigley, M.D., Ph.D.,

Stéphanie Boisson-Dupuis, Ph.D., Joana Azevedo, M.D., Anny Fortin, Ph.D.,Muzlifah Haniffa, M.D., Ph.D., Lourdes Ceron-Gutierrez, B.Sc.,

Chris M. Bacon, M.D., Ph.D., Geetha Menon, M.D., Céline Trouillet, B.Sc.,David McDonald, Ph.D., Peter Carey, M.D., Florent Ginhoux, Ph.D.,

Laia Alsina, M.D., Ph.D., Timothy J. Zumwalt, B.Sc., Xiao-Fei Kong, M.D., Ph.D.,Dinakantha Kumararatne, M.D., Ph.D., Karina Butler, M.B., B.Ch.,

Marjorie Hubeau, M.Sc., Jacqueline Feinberg, Ph.D., Saleh Al-Muhsen, M.D.,Andrew Cant, M.D., Laurent Abel, M.D., Ph.D., Damien Chaussabel, Ph.D.,

Rainer Doffinger, Ph.D., Eduardo Talesnik, M.D., Anete Grumach, M.D., Ph.D.,Alberto Duarte, M.D., Katia Abarca, M.D., Dewton Moraes-Vasconcelos, M.D., Ph.D.,

David Burk, Ph.D., Albert Berghuis, Ph.D., Frédéric Geissmann, M.D., Ph.D.,Matthew Collin, M.D., Ph.D., Jean-Laurent Casanova, M.D., Ph.D.,

and Philippe Gros, Ph.D.

INTRODUCTION

BACKGROUND

The genetic analysis of human primary immunodeficiencies has defined the contribution of specific cell populations and molecular pathways in the host defense against infection. Disseminated infection caused by bacille Calmette–Guérin (BCG) vaccines is an early manifestation of primary immunodeficiencies, such as severe combined immunodeficiency. In many affected persons, the cause of disseminated BCG disease is unexplained.

Abnormalities default of one or more elements of the immune system.

Features:Increased susceptibility to infectionIncreased susceptibility to develop neoplasmsRating:Congenital or primary immunodeficiency (rare)Secondary immunodeficiencies (FAQs)

IMMUNODEFICIENCY

PRIMARY IMMUNODEFICIENCY

The vast majority due to inherited genetic defects Very rare: 1/10.000 live births.

General features

• Increased susceptibility to infection recurrent and persistent (opportunistic infections):

Pyogenic bacteria and infections recurrent viral.

•Start early age of life (1st year).

•A family history.

IMMUNODEFICIENCY

CLASIFICATION FOR WHO.

SECONDARY IMMUNODEFICIENCIES

Immunodeficiency loss attributable to the style of antibodies and / or lymphocytes, by extrinsic causes.

•Rating:

•1. Immunosuppressive Drug Administration

•2. A radiation exposure

•3. Chronic infections, HIV infection

•4. States of malnutrition and vitamin deficiency

•5. Chronic renal failure

•6. Other Metabolic Diseases

•7. Malignancies

•8. Depression

IMMUNODEFICIENCY

DENDRITIC CELLS

.

IRF 8

Proteins that regulate expression genetics of interferon.

IRF8 is critical to the development of monocytes and dendritic cells, essential for antimycobaterial immunity.

RELATION

Suceptibility to mycobacterial infections

Suceptibility to mycobacterial infections

• Bacille calmette- Guerin (BCG)- mycobacteria.

GENERAL OBJETIVE

Identify the cause of human immunodeficiency in patients who were receiving vaccine Bacille Calmette Guèrin, as well as relations between IRF8 mutations and human dendritic cells inmunodeficiency.

MATERIALES Y MÈTODOS.

MATERIALES Y MÈTODOS.

Les hicieron un análisis genético y transcripcional:

1.Se estudio la secuencia IRF8 después de reacciones de amplificación con primers específicos.2.Se estudio la actividad transcripcional del IRF8 mutado y no mutado.3. Los datos obtenidos fueron usados en ensayos bioquímicos, caracterización molecular y análisis estadístico.

COLORACIONES DE LAS BIOPSIAS.

Adultos con biopsia de nódulo, presencia de bacilos acido alcohol resistentes.

Medula ósea con hiperplasia mieloide en la niña de 10

semanas de nacida.

Coloración de bacilos acido resistentes(mycobacterium).

COLORACIONES DE LAS BIOPSIAS.

CD68 Y CD63

Marcadores

CD1a Y CD14

REACCION EN CADENA DE LA POLIMERASA (PCR)

PCR

RESULTADOS.

Two variants of these disease

Autosomal Recessive IRF8 Deficiency

K108EAutosomal Dominat IRF8 Deficiency

T80A

GRAFICO 2

GRAFICO 2

GRAFICO 2

GRAFICO 3

Mr.Mr. What he said?What he said? Agree or disagreeAgree or disagree

•Scheller M, et al.•Tamura T, et al.•Holtschke T, et al.

Irf8 deficiency in mice is also associated with myeloproliferation of granulocyte precursors.

YES

•Geissmann F, et al.•Merad M, et al.

The finding that tissue macrophages and Langerhans’ cells are well represented in autosomal recessive IRF8 deficiency suggests heterogeneity within the mononuclear phagocyte compartment with respect to IRF8 independence or a potential for local selfrenewal.

YES

Mr.Mr. What he said?What he said? Agree or disagreeAgree or disagree

•Kubosaki A, et al.

The marked reduction in CD1c+ CD11c+ myeloid dendritic cells may be caused by altered ontogeny and maturation of this subgroup of CD11c+ cells, which is linked to target-specific or global transcriptional effects of the IRF8 T80A variant.

YES

•Ginhoux F, et al.

Further work will be required to establish the relative capacity of IRF8-deficient human CD34+ progenitors to produce fully functional macrophages and dendritic cells in vitro.

YES

• The molecular study of the immunodeficiencies has led to a greater undesrtanding of these class of diseases.

•The IRF8 mutations is an important discovery for the immunodeficiency treatment, because knowing the cause is easier start the correct treatment.

• This study can be incentive to find the specific causes of another diseases.

•The IRF8 found mutations generated a new form to see these class of an immunodeficiencies, and gave hope to these patients because now is easier identify and treat these diseases.

Estefanía Velásquez

Plutarco Uzcátegui

Martinez S LM. Biologia Molecular. Ed 6. Medellin. 2011. pg 113, 131- 133

Curso de Inmunología General. Celulas del sistema inmune. [August 30 2011]. [Internet]; Available on: http://www.ugr.es/~eianez/inmuno/cap_02.htm#_Toc440028784

Inmunodeficiencias Primarias y Secundarias. [August 30 2011]. [Internet]; Available on: http://campus.usal.es/~dermed/Inmunodeficiencias.pdf

Thank

you