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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 Am+J+Hum+Genet
2013 ; 93
(6
): 1126-34
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Disruption of autoregulatory feedback by a mutation in a remote, ultraconserved
PAX6 enhancer causes aniridia
#MMPMID24290376
Bhatia S
; Bengani H
; Fish M
; Brown A
; Divizia MT
; de Marco R
; Damante G
; Grainger R
; van Heyningen V
; Kleinjan DA
Am J Hum Genet
2013[Dec]; 93
(6
): 1126-34
PMID24290376
show ga
The strictly regulated expression of most pleiotropic developmental control genes
is critically dependent on the activity of long-range cis-regulatory elements.
This was revealed by the identification of individuals with a genetic condition
lacking coding-region mutations in the gene commonly associated with the disease
but having a variety of nearby chromosomal abnormalities, collectively described
as cis-ruption disease cases. The congenital eye malformation aniridia is caused
by haploinsufficiency of the developmental regulator PAX6. We discovered a de
novo point mutation in an ultraconserved cis-element located 150 kb downstream
from PAX6 in an affected individual with intact coding region and chromosomal
locus. The element SIMO acts as a strong enhancer in developing ocular
structures. The mutation disrupts an autoregulatory PAX6 binding site, causing
loss of enhancer activity, resulting in defective maintenance of PAX6 expression.
These findings reveal a distinct regulatory mechanism for genetic disease by
disruption of an autoregulatory feedback loop critical for maintenance of gene
expression through development.