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LAMB3 mutations causing autosomal-dominant amelogenesis imperfecta.
[junctional epidermolysis bullosa]
Amelogenesis
imperfecta
(
AI
)
can
be
either
isolated
or
part
of
a
larger
syndrome
.
Junctional
epidermolysis
bullosa
(
JEB
)
is
a
collection
of
autosomal-recessive
disorders
featuring
AI
associated
with
skin
fragility
and
other
symptoms
.
JEB
is
a
recessive
syndrome
usually
caused
by
mutations
in
both
alleles
of
COL
17
A
1
,
LAMA
3
,
LAMB
3
,
or
LAMC
2
.
In
rare
cases
,
heterozygous
carriers
in
JEB
kindreds
display
enamel
malformations
in
the
absence
of
skin
fragility
(
isolated
AI
)
.
We
recruited
two
kindreds
with
autosomal-dominant
amelogenesis
imperfecta
(
ADAI
)
characterized
by
generalized
severe
enamel
hypoplasia
with
deep
linear
grooves
and
pits
.
Whole-exome
sequencing
of
both
probands
identified
novel
heterozygous
mutations
in
the
last
exon
of
LAMB
3
that
likely
truncated
the
protein
.
The
mutations
perfectly
segregated
with
the
enamel
defects
in
both
families
.
In
Family
1
,
an
8
-
bp
deletion
(
c
.
3446
_
3453
del
GACTGGAG
)
shifted
the
reading
frame
(
p
.
Gly
1149
Glufs
*
8
)
.
In
Family
2
,
a
single
nucleotide
substitution
(
c
.
C
3
431
A
)
generated
an
in
-frame
translation
termination
codon
(
p
.
Ser
1144
*
)
.
We
conclude
that
enamel
formation
is
particularly
sensitive
to
defects
in
hemidesmosome
/
basement-membrane
complexes
and
that
syndromic
and
non-syndromic
forms
of
AI
can
be
etiologically
related
.
Diseases
Validation
Diseases presenting
"enamel formation"
symptom
dentin dysplasia
dentinogenesis imperfecta
dystrophic epidermolysis bullosa
junctional epidermolysis bullosa
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