Functional characterization of a novel PBX1 de novo missense variant identified in a patient with syndromic congenital heart disease.

Abstract:

:Pre-B cell leukemia factor 1 (PBX1) is an essential developmental transcription factor, mutations in which have recently been associated with CAKUTHED syndrome, characterized by multiple congenital defects including congenital heart disease (CHD). During analysis of a whole-exome-sequenced cohort of heterogeneous CHD patients, we identified a de novo missense variant, PBX1:c.551G>C p.R184P, in a patient with tetralogy of Fallot with absent pulmonary valve and extra-cardiac phenotypes. Functional analysis of this variant by creating a CRISPR-Cas9 gene-edited mouse model revealed multiple congenital anomalies. Congenital heart defects (persistent truncus arteriosus and ventricular septal defect), hypoplastic lungs, hypoplastic/ectopic kidneys, aplastic adrenal glands and spleen, as well as atretic trachea and palate defects were observed in the homozygous mutant embryos at multiple stages of development. We also observed developmental anomalies in a proportion of heterozygous embryos, suggestive of a dominant mode of inheritance. Analysis of gene expression and protein levels revealed that although Pbx1 transcripts are higher in homozygotes, amounts of PBX1 protein are significantly decreased. Here, we have presented the first functional model of a missense PBX1 variant and provided strong evidence that p.R184P is disease-causal. Our findings also expand the phenotypic spectrum associated with pathogenic PBX1 variants in both humans and mice.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Alankarage D,Szot JO,Pachter N,Slavotinek A,Selleri L,Shieh JT,Winlaw D,Giannoulatou E,Chapman G,Dunwoodie SL

doi

10.1093/hmg/ddz231

subject

Has Abstract

pub_date

2020-05-08 00:00:00

pages

1068-1082

issue

7

eissn

0964-6906

issn

1460-2083

pii

5585438

journal_volume

29

pub_type

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