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An Alu-mediated rearrangement causing a 3.2kb deletion and a novel two base pair deletion in AAAS gene as the cause of triple A syndrome.
[triple a syndrome]
Triple
A
syndrome
is
an
autosomal
recessive
disorder
resulting
from
deleterious
mutations
in
the
AAAS
gene
located
on
chromosome
12
q
13
.
Typical
clinical
presentation
of
this
syndrome
includes
adrenal
insufficiency
,
achalasia
,
and
alacrima
.
A
10
-
year
-old
female
was
diagnosed
with
Triple
A
syndrome
at
the
age
of
1
year
.
Initial
analysis
of
the
AAAS
gene
revealed
apparently
homozygosity
for
a
novel
2
bp
deletion
in
exon
1
.
The
father
of
the
patient
was
heterozygous
for
this
mutation
but
the
mother
and
the
maternal
grandparents
were
apparently
homozygous
for
the
wild-
type
.
Further
studies
demonstrated
that
the
patient
carried
an
intragenic
3
.
2
kb
deletion
within
both
5
'
and
3
'
breakpoints
located
within
Alu-repeats
.
The
deletion
includes
5
'
-
flanking
region
,
exon
1
,
intron
1
,
exon
2
,
and
part
of
intron
2
sequences
of
the
AAAS
gene
.
This
Alu-mediated
deletion
was
inherited
from
her
mother
and
maternal
grandmother
.
This
is
the
first
report
that
Alu-mediated
rearrangement
in
conjunction
with
a
novel
two
-bp
deletion
of
the
AAAS
gene
is
a
cause
of
Triple
A
syndrome
.
The
results
of
our
study
lead
to
the
hypothesis
that
an
Alu-mediated
mechanism
may
be
responsible
for
large
alterations
in
the
AAAS
gene
.
We
also
stress
the
importance
of
studying
the
family
in
genetic
recessive
diseases
,
such
as
Triple
A
syndrome
,
to
avoid
incorrect
diagnosis
and
to
provide
accurate
genetic
counseling
.
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