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Minotti C, Graziani L, Sallicandro E, Digilio MC, Falasca R, Alesi V, Novelli G, Dentici ML, Loddo S, Novelli A. Case report: A new de novo 6q21q22.1 interstitial deletion case in a girl with cerebellar vermis hypoplasia and developmental delay and literature review. Front Genet 2024; 14:1315291. [PMID: 38380230 PMCID: PMC10877002 DOI: 10.3389/fgene.2023.1315291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 12/04/2023] [Indexed: 02/22/2024] Open
Abstract
Interstitial deletions involving 6q chromosomal region are rare. Less than 30 patients have been described to date, and fewer have been characterized by high-resolution techniques, such as chromosomal microarray. Deletions involving 6q21q22.1 region are associated with an extremely wide and heterogeneous clinical spectrum, thus genotype-phenotype correlation based on the size of the rearranged region and on the involved genes is complex, even among individuals with overlapping deletions. Here we describe the phenotypic and molecular characterization of a new 6q interstitial deletion in a girl with developmental delay, intellectual disability, cerebellar vermis hypoplasia, facial peculiar characteristics, ataxia and ocular abnormalities. Microarray analysis of the proposita revealed a 7.9 Mb interstitial de novo deletion at 6q21q22.1 chromosomal region, which spanned from nucleotides 108,337,770 to 116,279,453 (GRCh38/hg38). The present case, alongside with a systematic review of the literature, provides further evidence that could aid to the definition of the Smallest Region of Overlap and of the genomic traits that are associated with particular phenotypes, focusing on neurological findings and especially on cerebellar anomalies.
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Affiliation(s)
- Chiara Minotti
- Medical Genetics Unit, Translational Pediatrics and Clinical Genetics Research Area, Bambino Gesù Children Hospital, Istituto di Ricovero e Cura a Carattere Scientifico, Rome, Italy
- Medical Genetics Section, Depepartment of Biomedicine and Prevention, Tor Vergata University of Rome, Rome, Italy
| | - Ludovico Graziani
- Medical Genetics Unit, Translational Pediatrics and Clinical Genetics Research Area, Bambino Gesù Children Hospital, Istituto di Ricovero e Cura a Carattere Scientifico, Rome, Italy
- Medical Genetics Section, Depepartment of Biomedicine and Prevention, Tor Vergata University of Rome, Rome, Italy
| | - Ester Sallicandro
- Translational Cytogenomics Research Unit, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
| | - Maria Cristina Digilio
- Medical Genetics Unit, Translational Pediatrics and Clinical Genetics Research Area, Bambino Gesù Children Hospital, Istituto di Ricovero e Cura a Carattere Scientifico, Rome, Italy
| | - Roberto Falasca
- Translational Cytogenomics Research Unit, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
| | - Viola Alesi
- Translational Cytogenomics Research Unit, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
| | - Giuseppe Novelli
- Medical Genetics Section, Depepartment of Biomedicine and Prevention, Tor Vergata University of Rome, Rome, Italy
- Medical Genetics Lab, Tor Vergata Hospital, Rome, Italy
| | - Maria Lisa Dentici
- Medical Genetics Unit, Translational Pediatrics and Clinical Genetics Research Area, Bambino Gesù Children Hospital, Istituto di Ricovero e Cura a Carattere Scientifico, Rome, Italy
| | - Sara Loddo
- Translational Cytogenomics Research Unit, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
| | - Antonio Novelli
- Translational Cytogenomics Research Unit, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
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Alesi V, Loddo S, Orlando V, Genovese S, Di Tommaso S, Liambo MT, Pompili D, Ferretti D, Calacci C, Catino G, Falasca R, Dentici ML, Novelli A, Digilio MC, Dallapiccola B. Atypical 7q11.23 deletions excluding ELN gene result in Williams-Beuren syndrome craniofacial features and neurocognitive profile. Am J Med Genet A 2020; 185:242-249. [PMID: 33098373 DOI: 10.1002/ajmg.a.61937] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 10/01/2020] [Accepted: 10/10/2020] [Indexed: 11/08/2022]
Abstract
Williams-Beurens syndrome (WBS) is a rare genetic disorder caused by a recurrent 7q11.23 microdeletion. Clinical characteristics include typical facial dysmorphisms, weakness of connective tissue, short stature, mild to moderate intellectual disability and distinct behavioral phenotype. Cardiovascular diseases are common due to haploinsufficiency of ELN gene. A few cases of larger or smaller deletions have been reported spanning towards the centromeric or the telomeric regions, most of which included ELN gene. We report on three patients from two unrelated families, presenting with distinctive WBS features, harboring an atypical distal deletion excluding ELN gene. Our study supports a critical role of CLIP2, GTF2IRD1, and GTF2I gene in the WBS neurobehavioral profile and in craniofacial features, highlights a possible role of HIP1 in the autism spectrum disorder, and delineates a subgroup of WBS individuals with an atypical distal deletion not associated to an increased risk of cardiovascular defects.
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Affiliation(s)
- Viola Alesi
- Bambino Gesù Children Hospital, IRCCS, Rome, Italy
| | - Sara Loddo
- Bambino Gesù Children Hospital, IRCCS, Rome, Italy
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Restaldi F, Alesi V, Aquilani A, Genovese S, Russo S, Coletti V, Pompili D, Falasca R, Dallapiccola B, Capolino R, Luciani M, Novelli A. A familial chromosomal complex rearrangement confirms RUNX1T1 as a causative gene for intellectual disability and suggests that 1p22.1p21.3 duplication is likely benign. Mol Cytogenet 2019; 12:26. [PMID: 31223340 PMCID: PMC6570965 DOI: 10.1186/s13039-019-0440-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 06/04/2019] [Indexed: 11/12/2022] Open
Abstract
Background Complex chromosomal rearrangements are constitutive structural aberrations involving three or more breaks. They can be balanced or unbalanced and result in different outcomes, depending on deletion/duplication of genomic material, gene disruption, or position effects. Case presentation We report on a patient presenting with severe anemia, splenomegaly, mild intellectual disability and facial dysmorphisms harboring a 4.3 Mb duplication at 1p22.1p21.3 and a 2.1 Mb deletion at 8q21.3q22.1, involving RUNX1T1 gene. The healthy brother presented the same duplication of chromosome 1p as at 1p22.1p21.3. Conclusions The rearrangement found both these siblings resulted from malsegregation in the proband and recombination in her healthy brother of a balanced paternal complex chromosomal rearrangement. These results confirm RUNX1T1 as a causative gene for intellectual disability and suggest the 1p22.1p21.3 duplication is likely benign.
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Affiliation(s)
| | - Viola Alesi
- Bambino Gesù Children's Hospital, Rome, Italy
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Alesi V, Loddo S, Calì F, Orlando V, Genovese S, Ferretti D, Calacci C, Calvieri G, Falasca R, Ulgheri L, Drago F, Dallapiccola B, Baban A, Novelli A. A heterozygous, intragenic deletion of CNOT2 recapitulates the phenotype of 12q15 deletion syndrome. Am J Med Genet A 2019; 179:1615-1621. [PMID: 31145527 DOI: 10.1002/ajmg.a.61217] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 04/10/2019] [Accepted: 05/13/2019] [Indexed: 01/19/2023]
Abstract
Only a few individuals with 12q15 deletion have been described, presenting with a disorder characterized by learning disability, developmental delay, nasal speech, and hypothyroidism. The smallest region of overlap for this syndrome was included in a genomic segment spanning CNOT2, KCNMB4, and PTPRB genes. We report on an additional patient harboring a 12q15 microdeletion encompassing only part of CNOT2 gene, presenting with a spectrum of clinical features overlapping the 12q15 deletion syndrome phenotype. We propose CNOT2 as the phenocritical gene for 12q15 deletion syndrome and its haploinsufficiency being associated with an autosomal dominant disorder, presenting with developmental delay, hypotonia, feeding problems, learning difficulties, nasal speech, skeletal anomalies, and facial dysmorphisms.
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Affiliation(s)
- Viola Alesi
- Department of Medical Genetics, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Sara Loddo
- Department of Medical Genetics, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Federica Calì
- Department of Pediatric Cardiology and Cardiac Surgery, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Valeria Orlando
- Department of Medical Genetics, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Silvia Genovese
- Department of Medical Genetics, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Daniele Ferretti
- Department of Medical Genetics, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Chiara Calacci
- Department of Medical Genetics, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Giusy Calvieri
- Department of Medical Genetics, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Roberto Falasca
- Department of Medical Genetics, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Lucia Ulgheri
- Department of Biomedical Sciences, Clinical Genetics Service, Azienda Ospedaliero-Universitaria, Sassari, Italy
| | - Fabrizio Drago
- Department of Pediatric Cardiology and Cardiac Surgery, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Bruno Dallapiccola
- Department of Medical Genetics, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Anwar Baban
- Department of Pediatric Cardiology and Cardiac Surgery, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Antonio Novelli
- Department of Medical Genetics, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
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