SGCD in Dilated Cardiomyopathy (DCM)

The role of rare variants in SGCD as causative mutations in Dilated Cardiomyopathy is described below. By comparing the frequency of SGCD variants in large DCM clinical cohorts to the background population rate in the ExAC database, the proportion of DCM patients with pathogenic mutations in SGCD can be estimated, as well as the likelihood that a rare (population allele frequency <0.0001) SGCD variant identified in a DCM patient is disease-causing. Summary data for different variant classes (all protein-altering variants, loss of function truncating variants and non-truncating variants) is highlighted - see the table below for full details of this analysis.

Excess of SGCD variants in DCM: 0.34% (p=0.1437)

Based on an analysis of all rare protein-altering variants (MAF<0.0001 in ExAC) in SGCD found in 590 DCM samples sequenced by OMGL and LMM and in reference samples of the ExAC population database.

Metrics by Variant Class:
All VarsTruncatingNon-Truncating
Excess in DCM 0.34%
Etiological fraction 0.50
0.00 - 0.81
0.00 - 0.98
0.00 - 0.79
Odds Ratio 2.02
0.54 - 5.29
0.20 - 60.70
0.33 - 4.80

The Etiological Fraction (EF) is the proportion of affected carriers where the variant caused DCM. The Odds Ratio (OR) describes the odds of having a rare variant in the patient cohort to the odds in the ExAC cohort. Fisher's exact test p-values are displayed for case excess, 95% confidence intervals for EFs and ORs.

in DCM
in ExAC
Case Excess
in DCM
LMM2590All4 0.006780.003380.00340
Truncating1 0.001690.000220.00147
Non-Truncating3 0.005080.003140.00194


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