Am. J. Respir. Crit. Care Med., Volume 162, Number 3, September 2000, 861-864

Familial Sarcoidosis Is Linked to the Major Histocompatibility Complex Region

MANFRED SCHÜRMANN, PENNY A. LYMPANY, PHILIPP REICHEL, BERTRAM MÜLLER-MYHSOK, KARL WURM, MAX SCHLAAK, JOACHIM MÜLLER-QUERNHEIM, RON M. du BOIS, and EBERHARD SCHWINGER

Institute of Human Genetics, Lübeck University Medical School, Lübeck; Bernhard Nocht Institute, Hamburg; Sonnenhof Hospital, Höchenschwand; Medical Hospital, Research Center Borstel, Borstel, Germany; and Royal Brompton Hospital, London, United Kingdom

Sarcoidosis is a systemic granulomatous disorder associated with high CD4+ cell activity, but no pathogen is detectable. Clustering in families occurs, and the existence of a genetic predisposition to sarcoidosis is widely accepted. The major histocompatibility complex (MHC) is believed to contribute to this susceptibility. Many studies testing this hypothesis have produced conflicting results. We have genotyped 122 affected siblings from 55 families for seven DNA polymorphisms that flank and cover the MHC region on chromosome 6, and for HLA-DPB1, a candidate gene for granulomatous disorders. Multipoint nonparametric linkage (NPL) analysis showed linkage (NPL score > 2.5; p < 0.006) for the entire MHC region with a maximum NPL score of 3.2 (p = 0.0008) at marker locus D6S1666 in the Class III gene cluster. There was a significant excess of marker haplotype sharing among affected siblings. However, the frequency of HLA-DPB1 alleles on 104 shared chromosomes did not differ from that of a control group of founders from the family panel. Transmission disequilibrium was found for allele DPB1*0201, but only nine families contributed to this result. We conclude that genes of the MHC are involved in the genetic predisposition to sarcoidosis, but HLA-DPB1 alone does not sufficiently explain this fact.

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