Cited 1 times since 2023 (1.6 per year) source: EuropePMC Netherlands heart journal : monthly journal of the Netherlands Society of Cardiology and the Netherlands Heart Foundation, Volume 31, Issue 7-8, 28 4 2023, Pages 315-323 The arrhythmogenic cardiomyopathy phenotype associated with PKP2 c.1211dup variant. Bos TA, Piers SRD, Wessels MW, Houweling AC, Bökenkamp R, Bootsma M, Bosman LP, Evertz R, Hellebrekers DMEI, Hoedemaekers YM, Knijnenburg J, Lekanne Deprez R, van Mil AM, Te Riele ASJM, van Slegtenhorst MA, Wilde AAM, Yap SC, Dooijes D, Koopmann TT, van Tintelen JP, Barge-Schaapveld DQCM, European Reference Network for rare, low prevalence and complex diseases of the heart: ERN GUARD-Heart

Background

The arrhythmogenic cardiomyopathy (ACM) phenotype, with life-threatening ventricular arrhythmias and heart failure, varies according to genetic aetiology. We aimed to characterise the phenotype associated with the variant c.1211dup (p.Val406Serfs*4) in the plakophilin‑2 gene (PKP2) and compare it with previously reported Dutch PKP2 founder variants.

Methods

Clinical data were collected retrospectively from medical records of 106 PKP2 c.1211dup heterozygous carriers. Using data from the Netherlands ACM Registry, c.1211dup was compared with 3 other truncating PKP2 variants (c.235C > T (p.Arg79*), c.397C > T (p.Gln133*) and c.2489+1G > A (p.?)).

Results

Of the 106 carriers, 47 (44%) were diagnosed with ACM, at a mean age of 41 years. By the end of follow-up, 29 (27%) had experienced sustained ventricular arrhythmias and 12 (11%) had developed heart failure, with male carriers showing significantly higher risks than females on these endpoints (p < 0.05). Based on available cardiac magnetic resonance imaging and echocardiographic data, 46% of the carriers showed either right ventricular dilatation and/or dysfunction, whereas a substantial minority (37%) had some form of left ventricular involvement. Both geographical distribution of carriers and haplotype analysis suggested PKP2 c.1211dup to be a founder variant originating from the South-Western coast of the Netherlands. Finally, a Cox proportional hazards model suggested significant differences in ventricular arrhythmia-free survival between 4 PKP2 founder variants, including c.1211dup.

Conclusions

The PKP2 c.1211dup variant is a Dutch founder variant associated with a typical right-dominant ACM phenotype, but also left ventricular involvement, and a possibly more severe phenotype than other Dutch PKP2 founder variants.

Neth Heart J. 2023 7;31(7-8):315-323