PMID- 30202443 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20220331 IS - 1755-8166 (Print) IS - 1755-8166 (Electronic) IS - 1755-8166 (Linking) VI - 11 DP - 2018 TI - Familiar unbalanced complex rearrangements involving 13 p-arm: description of two cases. PG - 52 LID - 10.1186/s13039-018-0400-6 [doi] LID - 52 AB - BACKGROUND: Copy number variations (CNVs) are largely known today, but their position is rarely established by fluorescence in situ hybridization (FISH) or karyotype analysis. CASE PRESENTATION: We described two families with copy number gain in which FISH analysis with the specific subtelomeric probe of chromosome 4q and 7q evidenced a third signal at band 13p11.2. Genomic study by array comparative genomic hybridization defined the triple dose segment. In the first case, the duplicate tract is free of known genes, in the second one it contained three expressed genes. CONCLUSIONS: The CNV localization on the short arm of an acrocentric chromosome could explain the lack of phenotypic effect, being known the regulatory role of heterochromatin in the position-effect silencing. Furthermore, we would like to underline the importance of using complementary techniques such as FISH and array-CGH to obtain a better definition of genomic rearrangements. FAU - Conconi, Donatella AU - Conconi D AD - 1School of Medicine and Surgery, University of Milano-Bicocca, Monza, Italy. ISNI: 0000 0001 2174 1754. GRID: grid.7563.7 FAU - Villa, Nicoletta AU - Villa N AD - 2Medical Genetics Laboratory, San Gerardo Hospital, Monza, Italy. ISNI: 0000 0004 1756 8604. GRID: grid.415025.7 FAU - Redaelli, Serena AU - Redaelli S AD - 1School of Medicine and Surgery, University of Milano-Bicocca, Monza, Italy. ISNI: 0000 0001 2174 1754. GRID: grid.7563.7 FAU - Sala, Elena AU - Sala E AD - 2Medical Genetics Laboratory, San Gerardo Hospital, Monza, Italy. ISNI: 0000 0004 1756 8604. GRID: grid.415025.7 FAU - Crosti, Francesca AU - Crosti F AD - 2Medical Genetics Laboratory, San Gerardo Hospital, Monza, Italy. ISNI: 0000 0004 1756 8604. GRID: grid.415025.7 FAU - Maitz, Silva AU - Maitz S AD - 3Pediatric Genetic Unit, Pediatric Department of Monza Brianza per il Bambino e la sua Mamma (MBBM) Foundation, San Gerardo Hospital, Monza, Italy. ISNI: 0000 0004 1756 8604. GRID: grid.415025.7 FAU - Rigoldi, Miriam AU - Rigoldi M AD - 2Medical Genetics Laboratory, San Gerardo Hospital, Monza, Italy. ISNI: 0000 0004 1756 8604. GRID: grid.415025.7 FAU - Parini, Rossella AU - Parini R AD - 4Pediatric Department of Monza Brianza per il Bambino e la sua Mamma (MBBM) Foundation, San Gerardo Hospital, Monza, Italy. ISNI: 0000 0004 1756 8604. GRID: grid.415025.7 FAU - Dalpra, Leda AU - Dalpra L AD - 1School of Medicine and Surgery, University of Milano-Bicocca, Monza, Italy. ISNI: 0000 0001 2174 1754. GRID: grid.7563.7 AD - 2Medical Genetics Laboratory, San Gerardo Hospital, Monza, Italy. ISNI: 0000 0004 1756 8604. GRID: grid.415025.7 FAU - Lavitrano, Marialuisa AU - Lavitrano M AD - 1School of Medicine and Surgery, University of Milano-Bicocca, Monza, Italy. ISNI: 0000 0001 2174 1754. GRID: grid.7563.7 FAU - Roversi, Gaia AU - Roversi G AD - 1School of Medicine and Surgery, University of Milano-Bicocca, Monza, Italy. ISNI: 0000 0001 2174 1754. GRID: grid.7563.7 AD - 2Medical Genetics Laboratory, San Gerardo Hospital, Monza, Italy. ISNI: 0000 0004 1756 8604. GRID: grid.415025.7 LA - eng PT - Case Reports DEP - 20180906 PL - England TA - Mol Cytogenet JT - Molecular cytogenetics JID - 101317942 PMC - PMC6127936 OTO - NOTNLM OT - Array-CGH OT - Chromosome 13 p arm OT - Copy number variations OT - FISH OT - Unbalanced translocation COIS- Not applicable.Written informed consent was obtained from the patient's parents for publication of this case report and any accompanying images.The authors declare that they have no competing interests.Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. EDAT- 2018/09/12 06:00 MHDA- 2018/09/12 06:01 PMCR- 2018/09/06 CRDT- 2018/09/12 06:00 PHST- 2018/06/04 00:00 [received] PHST- 2018/08/29 00:00 [accepted] PHST- 2018/09/12 06:00 [entrez] PHST- 2018/09/12 06:00 [pubmed] PHST- 2018/09/12 06:01 [medline] PHST- 2018/09/06 00:00 [pmc-release] AID - 400 [pii] AID - 10.1186/s13039-018-0400-6 [doi] PST - epublish SO - Mol Cytogenet. 2018 Sep 6;11:52. doi: 10.1186/s13039-018-0400-6. eCollection 2018.