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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 Mol+Autism
2015 ; 6
(ä): 19
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Complex nature of apparently balanced chromosomal rearrangements in patients with
autism spectrum disorder
#MMPMID25844147
Tabet AC
; Verloes A
; Pilorge M
; Delaby E
; Delorme R
; Nygren G
; Devillard F
; Gérard M
; Passemard S
; Héron D
; Siffroi JP
; Jacquette A
; Delahaye A
; Perrin L
; Dupont C
; Aboura A
; Bitoun P
; Coleman M
; Leboyer M
; Gillberg C
; Benzacken B
; Betancur C
Mol Autism
2015[]; 6
(ä): 19
PMID25844147
show ga
BACKGROUND: Apparently balanced chromosomal rearrangements can be associated with
an abnormal phenotype, including intellectual disability and autism spectrum
disorder (ASD). Genome-wide microarrays reveal cryptic genomic imbalances,
related or not to the breakpoints, in 25% to 50% of patients with an abnormal
phenotype carrying a microscopically balanced chromosomal rearrangement. Here we
performed microarray analysis of 18 patients with ASD carrying balanced
chromosomal abnormalities to identify submicroscopic imbalances implicated in
abnormal neurodevelopment. METHODS: Eighteen patients with ASD carrying
apparently balanced chromosomal abnormalities were screened using single
nucleotide polymorphism (SNP) arrays. Nine rearrangements were de novo, seven
inherited, and two of unknown inheritance. Genomic imbalances were confirmed by
fluorescence in situ hybridization and quantitative PCR. RESULTS: We detected
clinically significant de novo copy number variants in four patients (22%),
including three with de novo rearrangements and one with an inherited
abnormality. The sizes ranged from 3.3 to 4.9 Mb; three were related to the
breakpoint regions and one occurred elsewhere. We report a patient with a
duplication of the Wolf-Hirschhorn syndrome critical region, contributing to the
delineation of this rare genomic disorder. The patient has a chromosome 4p
inverted duplication deletion, with a 0.5 Mb deletion of terminal 4p and a 4.2 Mb
duplication of 4p16.2p16.3. The other cases included an apparently balanced de
novo translocation t(5;18)(q12;p11.2) with a 4.2 Mb deletion at the 18p
breakpoint, a subject with de novo pericentric inversion inv(11)(p14q23.2) in
whom the array revealed a de novo 4.9 Mb deletion in 7q21.3q22.1, and a patient
with a maternal inv(2)(q14.2q37.3) with a de novo 3.3 Mb terminal 2q deletion and
a 4.2 Mb duplication at the proximal breakpoint. In addition, we identified a
rare de novo deletion of unknown significance on a chromosome unrelated to the
initial rearrangement, disrupting a single gene, RFX3. CONCLUSIONS: These
findings underscore the utility of SNP arrays for investigating apparently
balanced chromosomal abnormalities in subjects with ASD or related
neurodevelopmental disorders in both clinical and research settings.