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(Hypertension. 2007;49:453.)
© 2007 American Heart Association, Inc.

Original Articles

Genome-Wide Linkage Mapping for Valve Calcification Susceptibility Loci in Hypertensive Sibships

The Hypertension Genetic Epidemiology Network Study

Jonathan N. Bella; Weihong Tang; Aldi Kraja; Dabeeru C. Rao; Steven C. Hunt; Michael B. Miller; Vittorio Palmieri; Mary J. Roman; Dalane W. Kitzman; Albert Oberman; Richard B. Devereux; Donna K. Arnett

From the Weill Medical College (J.N.B., V.P., M.J.R., R.B.D.), Cornell University, New York, NY; the Bronx-Lebanon Hospital Center (J.N.B.), Bronx, NY; the University of Minnesota (W.T., M.B.M.), Minneapolis; Washington University (A.K., D.C.R.), St Louis, Mo; the School of Medicine (S.C.H.), University of Utah, Salt Lake City; the School of Medicine (D.W.K.), Wake Forrest University, Winston-Salem, NC; and the University of Alabama at Birmingham (A.O., D.K.A.).

Correspondence to Jonathan N. Bella, Bronx-Lebanon Hospital Center, Division of Cardiology (12th Floor), 1650 Grand Concourse, Bronx, NY 10457. E-mail jonnbella{at}earthlink.net

It remains unclear whether genetic factors contribute to the susceptibility to valve calcification. Accordingly, echocardiograms and genotyping were performed in 1871 hypertensive siblings who participated in the Hypertension Genetic Epidemiology Network Study. Genome-wide affected sibpair nonparametric linkage analysis was conducted using the allele-sharing method implemented in the Merlin computer program. A total of 1014 sibships from 858 families were evaluated for aortic valve sclerosis or mitral annular calcification. Of these, 78 sibships from 68 families contained 2 affected siblings with 1 type of valve calcification (142 affected siblings). All 3 of the traits showed a modest degree of familial aggregation, with sibling recurrence risk (SD) and sibling recurrence risk ratio (95% CI) being 0.25 (0.035) and 2.31 (1.72 to 3.11) for aortic valve sclerosis, 0.25 (0.035) and 1.78 (1.36 to 2.33) for mitral annular calcification, and 0.31 (0.030) and 1.52 (1.24 to 1.85) for aortic valve sclerosis and mitral annular calcification, respectively. Affected sibpair linkage analysis revealed the highest logarithm of odds score (3.14) in chromosome 16 at 105.6 cM for aortic valve sclerosis. Other chromosomal regions with logarithm of odds score 1.9 were found in chromosomes 19 (2.88), 16 (2.63), 1 (2.12), and 2 (2.03) for aortic valve sclerosis and chromosome 13 (2.12) for any valve calcification. There was no logarithm of odds score 1.9 for mitral annular calcification. Our study shows strong linkage of aortic valve sclerosis to chromosome 16q22.1-q22.3 and suggestive linkage to chromosome 19p13.11-p11 and identifies several other promising genomic regions that may contain specific susceptibility loci for valve calcification.

Key Words: genetics • valves • calcification • echocardiography • epidemiology

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