Abstract:
:Dilated cardiomyopathy (DCM) is a life-threatening disorder whose genetic basis is heterogeneous and mostly unknown. Five Arab Christian infants, aged 4-30 months from four families, were diagnosed with DCM associated with mild skin, teeth, and hair abnormalities. All passed away before age 3. A homozygous sequence variation creating a premature stop codon at PPP1R13L encoding the iASPP protein was identified in three infants and in the mother of the other two. Patients' fibroblasts and PPP1R13L-knocked down human fibroblasts presented higher expression levels of pro-inflammatory cytokine genes in response to lipopolysaccharide, as well as Ppp1r13l-knocked down murine cardiomyocytes and hearts of Ppp1r13l-deficient mice. The hypersensitivity to lipopolysaccharide was NF-κB-dependent, and its inducible binding activity to promoters of pro-inflammatory cytokine genes was elevated in patients' fibroblasts. RNA sequencing of Ppp1r13l-knocked down murine cardiomyocytes and of hearts derived from different stages of DCM development in Ppp1r13l-deficient mice revealed the crucial role of iASPP in dampening cardiac inflammatory response. Our results determined PPP1R13L as the gene underlying a novel autosomal-recessive cardio-cutaneous syndrome in humans and strongly suggest that the fatal DCM during infancy is a consequence of failure to regulate transcriptional pathways necessary for tuning cardiac threshold response to common inflammatory stressors.
journal_name
EMBO Mol Medjournal_title
EMBO molecular medicineauthors
Falik-Zaccai TC,Barsheshet Y,Mandel H,Segev M,Lorber A,Gelberg S,Kalfon L,Ben Haroush S,Shalata A,Gelernter-Yaniv L,Chaim S,Raviv Shay D,Khayat M,Werbner M,Levi I,Shoval Y,Tal G,Shalev S,Reuveni E,Avitan-Hersh E,Vdoi
10.15252/emmm.201606523subject
Has Abstractpub_date
2017-03-01 00:00:00pages
319-336issue
3eissn
1757-4676issn
1757-4684pii
emmm.201606523journal_volume
9pub_type
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