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MLL2 mutation detection in 86 patients with Kabuki syndrome: a genotype-phenotype study.
[kabuki syndrome]
Recently
,
pathogenic
variants
in
the
MLL
2
gene
were
identified
as
the
most
common
cause
of
Kabuki
(
Niikawa-
Kuroki
)
syndrome
(
MIM
#
147920
)
.
To
further
elucidate
the
genotype-phenotype
correlation
,
we
studied
a
large
cohort
of
86
clinically
defined
patients
with
Kabuki
syndrome
(
KS
)
for
mutations
in
MLL
2
.
All
patients
were
assessed
using
a
standardized
phenotype
list
and
all
were
scored
using
a
newly
developed
clinical
score
list
for
KS
(
MLL
2
-
Kabuki
score
0
-
10
)
.
Sequencing
of
the
full
coding
region
and
intron-exon
boundaries
of
MLL
2
identified
a
total
of
45
likely
pathogenic
mutations
(
52
%
)
:
31
nonsense
,
10
missense
and
four
splice-site
mutations
,
34
of
which
were
novel
.
In
five
additional
patients
,
novel
,
i
.
e
.
non-db
SNP
132
variants
of
clinically
unknown
relevance
,
were
identified
.
Patients
with
likely
pathogenic
nonsense
or
missense
MLL
2
mutations
were
usually
more
severely
affected
(
median
'
MLL
2
-
Kabuki
score
'
of
6
)
as
compared
to
the
patients
without
MLL
2
mutations
(
median
'
MLL
2
-
Kabuki
score
'
of
5
)
,
a
significant
difference
(
p
<
0
.
0014
)
.
Several
typical
facial
features
such
as
large
dysplastic
ears
,
arched
eyebrows
with
sparse
lateral
third
,
blue
sclerae
,
a
flat
nasal
tip
with
a
broad
nasal
root
,
and
a
thin
upper
and
a
full
lower
lip
were
observed
more
often
in
mutation
positive
patients
.
Diseases
Validation
Diseases presenting
"were identified"
symptom
kabuki syndrome
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