Publications by authors named "Aleksandr M Nikonov"

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Compound phenotype in a girl with r(22), concomitant microdeletion 22q13.32-q13.33 and mosaic monosomy 22.

Mol Cytogenet 2018 27;11:26. Epub 2018 Apr 27.

1Research Institute of Medical Genetics, Tomsk NRMC, Tomsk, Russia.

Background: Ring chromosome instability may influence a patient's phenotype and challenge its interpretation.

Results: Here, we report a 4-year-old girl with a compound phenotype. Cytogenetic analysis revealed her karyotype to be 46,XX,r(22). aCGH identified a 180 kb 22q13.32 duplication, a 2.024 Mb subtelomeric 22q13.32-q13.33 deletion, which is associated with Phelan-McDermid syndrome, and a maternal single gene 382-kb deletion of uncertain clinical significance located in the region of the 3q13.31 deletion syndrome. All chromosomal aberrations were confirmed by real-time PCR in lymphocytes and detected in skin fibroblasts. The deletions were also found in the buccal epithelium. According to FISH analysis, 8% and 24% of the patient's lymphocytes and skin fibroblasts, respectively, had monosomy 22.

Conclusions: We believe that a combination of 22q13.32-q13.33 deletion and monosomy 22 in a portion of cells can better define the clinical phenotype of the patient. Importantly, the presence of monosomic cells indicates ring chromosome instability, which may favor karyotype correction that is significant for the development of chromosomal therapy protocols.
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http://dx.doi.org/10.1186/s13039-018-0375-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5923029PMC
April 2018