Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 269.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 269.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\26101329
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Med+Genet
2015 ; 52
(9
): 612-6
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Continued lessons from the INS gene: an intronic mutation causing diabetes
through a novel mechanism
#MMPMID26101329
Carmody D
; Park SY
; Ye H
; Perrone ME
; Alkorta-Aranburu G
; Highland HM
; Hanis CL
; Philipson LH
; Bell GI
; Greeley SA
J Med Genet
2015[Sep]; 52
(9
): 612-6
PMID26101329
show ga
BACKGROUND: Diabetes in neonates usually has a monogenic aetiology; however, the
cause remains unknown in 20-30%. Heterozygous INS mutations represent one of the
most common gene causes of neonatal diabetes mellitus. METHODS: Clinical and
functional characterisation of a novel homozygous intronic mutation
(c.187+241G>A) in the insulin gene in a child identified through the Monogenic
Diabetes Registry (http://monogenicdiabetes.uchicago.edu). RESULTS: The proband
had insulin-requiring diabetes from birth. Ultrasonography revealed a
structurally normal pancreas and C-peptide was undetectable despite readily
detectable amylin, suggesting the presence of dysfunctional ? cells. Whole-exome
sequencing revealed the novel mutation. In silico analysis predicted a mutant
mRNA product resulting from preferential recognition of a newly created splice
site. Wild-type and mutant human insulin gene constructs were derived and
transiently expressed in INS-1 cells. We confirmed the predicted transcript and
found an additional transcript created via an ectopic splice acceptor site.
CONCLUSIONS: Dominant INS mutations cause diabetes via a mutated translational
product causing endoplasmic reticulum stress. We describe a novel mechanism of
diabetes, without ? cell death, due to creation of two unstable mutant
transcripts predicted to undergo nonsense and non-stop-mediated decay,
respectively. Our discovery may have broader implications for those with insulin
deficiency later in life.