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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2014 ; 289
(43
): 29801-16
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Essential role of the zinc finger transcription factor Casz1 for mammalian
cardiac morphogenesis and development
#MMPMID25190801
Liu Z
; Li W
; Ma X
; Ding N
; Spallotta F
; Southon E
; Tessarollo L
; Gaetano C
; Mukouyama YS
; Thiele CJ
J Biol Chem
2014[Oct]; 289
(43
): 29801-16
PMID25190801
show ga
Chromosome 1p36 deletion syndrome is one of the most common terminal deletions
observed in humans and is related to congenital heart disease (CHD). However, the
1p36 genes that contribute to heart disease have not been clearly delineated.
Human CASZ1 gene localizes to 1p36 and encodes a zinc finger transcription
factor. Casz1 is required for Xenopus heart ventral midline progenitor cell
differentiation. Whether Casz1 plays a role during mammalian heart development is
unknown. Our aim is to determine 1p36 gene CASZ1 function at regulating heart
development in mammals. We generated a Casz1 knock-out mouse using Casz1-trapped
embryonic stem cells. Casz1 deletion in mice resulted in abnormal heart
development including hypoplasia of myocardium, ventricular septal defect, and
disorganized morphology. Hypoplasia of myocardium was caused by decreased
cardiomyocyte proliferation. Comparative genome-wide RNA transcriptome analysis
of Casz1 depleted embryonic hearts identifies abnormal expression of genes that
are critical for muscular system development and function, such as muscle
contraction genes TNNI2, TNNT1, and CKM; contractile fiber gene ACTA1; and
cardiac arrhythmia associated ion channel coding genes ABCC9 and CACNA1D. The
transcriptional regulation of some of these genes by Casz1 was also found in
cellular models. Our results showed that loss of Casz1 during mouse development
led to heart defect including cardiac noncompaction and ventricular septal
defect, which phenocopies 1p36 deletion syndrome related CHD. This suggests that
CASZ1 is a novel 1p36 CHD gene and that the abnormal expression of cardiac
morphogenesis and contraction genes induced by loss of Casz1 contributes to the
heart defect.