Studija slučaja
https://doi.org/10.3325/cmj.2023.64.339
The first case report of distal 16p12.1p11.2 trisomy and proximal 16p11.2 tetrasomy inherited from both parents
Leona Morožin Pohovski
orcid.org/0009-0002-1496-2078
; Department of Medical and Laboratory Genetics, Endocrinology and Diabetology, Children’s Hospital Zagreb, University of Zagreb, School of Medicine, Zagreb, Croatia
*
Ivona Sansović
; Department of Medical and Laboratory Genetics, Endocrinology and Diabetology, Children’s Hospital Zagreb, University of Zagreb, School of Medicine, Zagreb, Croatia
Katarina Vulin
; Department of Medical and Laboratory Genetics, Endocrinology and Diabetology, Children’s Hospital Zagreb, University of Zagreb, School of Medicine, Zagreb, Croatia
Ljubica Odak
; Department of Medical and Laboratory Genetics, Endocrinology and Diabetology, Children’s Hospital Zagreb, University of Zagreb, School of Medicine, Zagreb, Croatia
* Dopisni autor.
Sažetak
Recurrent copy number variants in the chromosomal region 16p11.2 are among the most frequent genetic causes
of neurodevelopmental disorders. The increasing prevalence of brain structural anomalies is also associated with
16p11.2 deletions and duplications. We report on a fouryear-old boy with microcephaly, trigonocephaly, and dysmorphic features. The patient also exhibited motor delay and autism spectrum disorder. Microarray analysis
showed a single-copy gain of a 1.187 kb segment in the
16p12.1p11.2 region and a two-copy gain of a 525 kb segment in the 16p11.2 region. Parental analysis revealed a 1.7
Mb duplication at the 16p12.1p11.2 (BP1-BP5 region) in
the father and a 525 kb duplication in the 16p11.2 region
(BP4-BP5) in the mother. The patient inherited the entire
abnormality from each parent and, as a result, presented
with partial trisomy of the 16p12.1p11.2 region and partial
tetrasomy of the 16p11.2 region. The MLPA P343 Autism-1
Probemix was used to verify the copy number gains in
the 16p11.2 region detected by chromosomal microarray
analysis. Double duplications are very rare chromosomal
rearrangements. The phenotype for distal 16p12.1p11.2 trisomy (BP1-BP3) and proximal 16p11.2 (BP4-BP5) tetrasomy
is unknown. To our knowledge, this is the first patient described in the literature who inherited 16p11.2 duplications from both parents.
Ključne riječi
Hrčak ID:
331870
URI
Datum izdavanja:
30.9.2024.
Posjeta: 38 *