Circulation, Vol 87, 1854-1865, Copyright © 1993 by American Heart Association
JA Towbin, JF Hejtmancik, P Brink, B Gelb, XM Zhu, JS Chamberlain, ER McCabe and M Swift
BACKGROUND. X-linked cardiomyopathy (XLCM) is a rapidly progressive primary
myocardial disorder presenting in teenage males as congestive heart
failure. Manifesting female carriers have later onset (fifth decade) and
slower progression. The purpose of this study was to localize the XLCM gene
locus in two families using molecular genetic techniques. METHODS AND
RESULTS. Linkage analysis using 60 X-chromosome- specific DNA markers was
performed in a previously reported large XLCM pedigree and a smaller new
pedigree. Two-point and multipoint linkage was calculated using the LINKAGE
computer program package. Deletion analysis included multiplex polymerase
chain reaction (PCR). Dystrophin protein was evaluated by Western blotting
with N-terminal and C- terminal dystrophin antibody. Linkage of XLCM to the
centromeric portion of the dystrophin or Duchenne muscular dystrophy (DMD)
locus at Xp21 was demonstrated with combined maximum logarithm of the
scores of +4.33, theta = 0 with probe XJ1.1 (DXS206) using two-point
linkage and +4.81 at XJ1.1 with multipoint linkage analysis. LOD scores
calculated using other proximal DMD genomic and cDNA probes and polymerase
chain reaction polymorphisms supported linkage. No deletions were observed.
Abnormalities of cardiac dystrophin were shown by Western blotting with
N-terminal dystrophin antibody, whereas skeletal muscle dystrophin was
normal, suggesting primary involvement of the DMD gene with preferential
involvement of cardiac muscle. CONCLUSIONS. XLCM is due to an abnormality
within the centromeric half of the dystrophin genomic region in heart. This
abnormality could be due to 1) a point mutation in the 5' region of the DMD
coding sequence preferentially affecting cardiac function, 2) a
cardiac-specific promoter mutation that alters expression in this tissue,
3) splicing abnormalities, resulting in an abnormal cardiac protein, or 4)
deletion mutations undetectable by Southern and multiplex polymerase chain
reaction analysis.
ARTICLES
X-linked dilated cardiomyopathy. Molecular genetic evidence of linkage to the Duchenne muscular dystrophy (dystrophin) gene at the Xp21 locus
Baylor College of Medicine, Department of Pediatrics, Houston, TX 77030.
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