<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Trisomy 16 is the most common type of autosomal trisomy associated with spontaneous abortion and is incompatible with life. Upon examining previously reported cases of partial chromosome 16q duplication, it was noted that the majority of cases had complex chromosomal abnormalities due to parental balanced chromosomal translocation carriage. The clinical presentation of very rare pure partial trisomy 16q cases was associated with congenital anomalies, facial dysmorphic findings and intellectual disability. In this study, we evaluated the physical characteristics and genetic data of an 8-month-old girl with developmental delay and facial dysmorphic features. Dysmorphic features including prominent metopic suture, synophrys, asymmetric head shape, triangular and asymmetric face, telecanthus, epicanthal folds, down-slanting palpebral fissures, microphthalmia of the left eye, anteverted nares, smooth and tented philtrum, microretrognathia, low-set posteriorly rotated ears, auricular pits, high-arched palate, thin upper lip and hypotonia were recorded. Her karyotype was 46,XX,add(16)(q24). To identify the extension of the duplicated section, array comparative genomic hybridization (aCGH) analysis was performed, which showed a <italic>de novo</italic> 29.8 Mb duplication [arr[hgl9] 16q12.1q23.3(52459169-82285105) x 3], interpreted to be pathogenic. We present this case report to clarify the clinical findings of a rare chromosomal anomaly, discuss the genes that may be related to the phenotype and advance the literature in terms of knowledge regarding genotypephenotype correlation.</p></abstract>

Trisomy 16 is the most common type of autosomal trisomy associated with spontaneous abortion and is incompatible with life. Upon examining previously reported cases of partial chromosome 16q duplication, it was noted that the majority of cases had complex chromosomal abnormalities due to parental balanced chromosomal translocation carriage. The clinical presentation of very rare pure partial trisomy 16q cases was associated with congenital anomalies, facial dysmorphic findings and intellectual disability. In this study, we evaluated the physical characteristics and genetic data of an 8-month-old girl with developmental delay and facial dysmorphic features. Dysmorphic features including prominent metopic suture, synophrys, asymmetric head shape, triangular and asymmetric face, telecanthus, epicanthal folds, down-slanting palpebral fissures, microphthalmia of the left eye, anteverted nares, smooth and tented philtrum, microretrognathia, low-set posteriorly rotated ears, auricular pits, high-arched palate, thin upper lip and hypotonia were recorded. Her karyotype was 46,XX,add(16)(q24). To identify the extension of the duplicated section, array comparative genomic hybridization (aCGH) analysis was performed, which showed a de novo 29.8 Mb duplication [arr[hgl9] 16q12.1q23.3(52459169-82285105) x 3], interpreted to be pathogenic. We present this case report to clarify the clinical findings of a rare chromosomal anomaly, discuss the genes that may be related to the phenotype and advance the literature in terms of knowledge regarding genotypephenotype correlation.

A very rare partial trisomy syndrome: <italic>De novo</italic> duplication of 16q12.1q23.3 in a Turkish girl with developmental delay and facial dysmorphic features

Balkan Journal of Medical Genetics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

A very rare partial trisomy syndrome:  duplication of 16q12.1q23.3 in a Turkish girl with developmental delay and facial dysmorphic features

Trisomy 16 is the most common type of autosomal trisomy associated with spontaneous abortion and is incompatible with life. Upon examining previously reported...

A very rare partial trisomy syndrome: De novo duplication of 16q12.1q23.3 in a Turkish girl with developmental delay and facial dysmorphic features

Article Category: Case Report

Published Online: Aug 26, 2020

Page range: 103 - 108

DOI: https://doi.org/10.2478/bjmg-2020-0009

Keywords
Array comparative genomic hybridization (aCGH), Partial trisomy 16, 16q duplication

© 2020 Türkyılmaz A, Yaralı O, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

A very rare partial trisomy syndrome: De novo duplication of 16q12.1q23.3 in a Turkish girl with developmental delay and facial dysmorphic features

Article Category: Case Report

Published Online: Aug 26, 2020

Page range: 103 - 108

DOI: https://doi.org/10.2478/bjmg-2020-0009

KeywordsArray comparative genomic hybridization (aCGH), Partial trisomy 16, 16q duplication

© 2020 Türkyılmaz A, Yaralı O, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Array comparative genomic hybridization (aCGH), Partial trisomy 16, 16q duplication