1
|
Jiao J, Wang Y, Hou Y, Gao C, Shi H, Tian S. Clinical characterization of familial 1p36.3 microduplication. Neurogenetics 2023; 24:201-208. [PMID: 37289317 PMCID: PMC10319691 DOI: 10.1007/s10048-023-00722-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Accepted: 05/25/2023] [Indexed: 06/09/2023]
Abstract
Unlike the 1p36 microdeletion syndrome, which has been extensively described, 1p36.3 microduplications have rarely been reported. We report the two siblings of familial 1p36.3 microduplication, presenting with a severe global developmental delay, epilepsy, and a few dysmorphic features. They were referred to moderate-to-severe developmental delay (DD) and intellectual disability (ID). Both were considered eyelid myoclonus with absence of epilepsy (Jeavons syndrome). The EEG is characterized by widespread 2.5-3.5 Hz spikes and spike slow complex wave, eye closure sensitivity, and photosensitivity. The children has same dysmorphic features, including mild bitemporal narrowing and sloping forehead, sparse eyebrows, hypertelorism, ptosis, strabismus, infraorbital creases, wide nasal bridge with bulbous nasal tip, dystaxia, hallux valgus, and flat feet. Family exome sequencing revealed a maternally inherited 3.2-Mb microduplication of chromosomal band 1p36.3p36.2. However, DNA purified from blood samples of either parent did not find evidence for a microduplication of 1p36 in somatic tissue, indicating that such a mutation might be carried in the germline of the parents as gonadal mosaicism. No other family members of the affected siblings' parents were reported to be affected by the symptoms found.
Collapse
Affiliation(s)
- Junping Jiao
- Department of Neurology, The First Hospital of Hebei Medical University, Shijiangzhuang City, Hebei Province, China
| | - Yuping Wang
- Xuanwu Hospital Capital Medical University, Beijing, China
| | - Yue Hou
- Xuanwu Hospital Capital Medical University, Beijing, China
| | - Chao Gao
- Department of Neurology, The First Hospital of Hebei Medical University, Shijiangzhuang City, Hebei Province, China
| | - Huimin Shi
- Department of Neurology, The First Hospital of Hebei Medical University, Shijiangzhuang City, Hebei Province, China
| | - Shujuan Tian
- Department of Neurology, The First Hospital of Hebei Medical University, Shijiangzhuang City, Hebei Province, China.
| |
Collapse
|
2
|
Pelgrims E, Lynch SA, Hannes L, Hoffer MJV, Melotte C, Van Haeringen A, Swillen A, Breckpot J. Triplications of chromosome 1p36.3, including the genes GABRD and SKI, are associated with a developmental disorder and a facial gestalt. Am J Med Genet A 2023. [PMID: 37129290 DOI: 10.1002/ajmg.a.63222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 03/03/2023] [Accepted: 04/18/2023] [Indexed: 05/03/2023]
Abstract
Triplication of chromosomal region 1p36.3 is a rare genomic rearrangement. In this report, we delineate the phenotypic spectrum associated with 1p36.3 triplications. We describe four patients with microtriplications of variable size, but with a strong phenotypic overlap, and compare them to previously described patients with an isolated triplication or duplication of this region. The 1p36.3 triplication syndrome is associated with a distinct phenotype, characterized by global developmental delay, moderate intellectual disability, seizures, behavioral problems, and specific facial dysmorphic features, including ptosis, hypertelorism, and arched eyebrows. The de novo occurrence of these microtriplications demonstrates the reduced reproductive fitness associated with this genotype, in contrast to 1p36.3 duplications which are mostly inherited and can be associated with similar facial features but with a less severe developmental phenotype. The shared triplicated region encompasses four disease-related genes of which GABRD and SKI are most likely to contribute to the phenotype.
Collapse
Affiliation(s)
- Elise Pelgrims
- Department of Human Genetics, Catholic University Leuven, Leuven, Belgium
| | - Sally Ann Lynch
- Department of Clinical Genetics, Children's University Hospital, Dublin, Republic of Ireland
| | - Laurens Hannes
- Department of Human Genetics, Catholic University Leuven, Leuven, Belgium
- Center for Human Genetics, University Hospitals Leuven, Leuven, Belgium
| | - Mariëtte J V Hoffer
- Department of Clinical Genetics, Leiden University Medical Centre, Leiden, The Netherlands
| | - Cindy Melotte
- Center for Human Genetics, University Hospitals Leuven, Leuven, Belgium
| | - Arie Van Haeringen
- Department of Clinical Genetics, Leiden University Medical Centre, Leiden, The Netherlands
| | - Ann Swillen
- Department of Human Genetics, Catholic University Leuven, Leuven, Belgium
- Center for Human Genetics, University Hospitals Leuven, Leuven, Belgium
| | - Jeroen Breckpot
- Department of Human Genetics, Catholic University Leuven, Leuven, Belgium
- Center for Human Genetics, University Hospitals Leuven, Leuven, Belgium
| |
Collapse
|
3
|
Molecular characterization of a 1p36 chromosomal duplication and in utero interference define ENO1 as a candidate gene for polymicrogyria. Eur J Hum Genet 2020; 28:1703-1713. [PMID: 32488097 DOI: 10.1038/s41431-020-0659-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 05/12/2020] [Accepted: 05/19/2020] [Indexed: 11/08/2022] Open
Abstract
While chromosome 1p36 deletion syndrome is one of the most common terminal subtelomeric microdeletion syndrome, 1p36 microduplications are rare events. Polymicrogyria (PMG) is a brain malformation phenotype frequently present in patients with 1p36 monosomy. The gene whose haploinsufficiency could cause this phenotype remains to be identified. We used high-resolution arrayCGH in patients with various forms of PMG in order to identify chromosomal variants associated to the malformation and characterized the genes included in these regions in vitro and in vivo. We identified the smallest case of 1p36 duplication reported to date in a patient presenting intellectual disability, microcephaly, epilepsy, and perisylvian polymicrogyria. The duplicated segment is intrachromosomal, duplicated in mirror and contains two genes: enolase 1 (ENO1) and RERE, both disrupted by the rearrangement. Gene expression analysis performed using the patient cells revealed a reduced expression, mimicking haploinsufficiency. We performed in situ hybridization to describe the developmental expression profile of the two genes in mouse development. In addition, we used in utero electroporation of shRNAs to show that Eno1 inactivation in the rat causes a brain development defect. These experiments allowed us to define the ENO1 gene as the most likely candidate to contribute to the brain malformation phenotype of the studied patient and consequently a candidate to contribute to the malformations of the cerebral cortex observed in patients with 1p36 monosomy.
Collapse
|
4
|
Marquet V, Bourthoumieu S, Dobrescu A, Laroche-Raynaud C, Yardin C. Familial 1p36.3 microduplication resulting from a 1p-9q non-reciprocal translocation. Eur J Med Genet 2017; 60:583-588. [PMID: 28811188 DOI: 10.1016/j.ejmg.2017.08.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 06/22/2017] [Accepted: 08/10/2017] [Indexed: 10/19/2022]
Abstract
Unlike the 1p36 microdeletion syndrome, which has been extensively described, 1p36 microduplications have rarely been reported. We describe a three years old boy presenting with a severe global developmental delay and a few dysmorphic features. Cytogenetic analyses revealed a maternally inherited 3.35 Mb microduplication of chromosomal band 1p36.3. The maternal grandfather is also carrier of the same chromosomal rearrangement. Interestingly, the duplicated 1p36.3 segment was found to be localized at the telomeric end of the long arms of a chromosome 9, probably deriving from a 1p36.3-9qter non-reciprocal translocation. This particular type of chromosomal translocation has rarely been reported, and its mechanism is unclear. The phenotypical features associated with 1p36.3 microduplication vary due to the non-recurrent breakpoints of the rearrangements in this particular region. However when compiling the few described cases the phenotypical spectrum seems to include mainly developmental delay, mild facial dysmorphism, and neurological, cardiac and skeletal anomalies. The description of new patients carrying a 1p36.3 duplication like ours will lead to further delineation of the phenotypical spectrum and may help to find critical regions and causative genes implicated in the phenotype.
Collapse
Affiliation(s)
- Valentine Marquet
- Department of Cytology, Histology, Cytogenetics and Cellular Biology, Limoges University Hospital, France.
| | - Sylvie Bourthoumieu
- Department of Cytology, Histology, Cytogenetics and Cellular Biology, Limoges University Hospital, France
| | - Amelia Dobrescu
- Department of Cytology, Histology, Cytogenetics and Cellular Biology, Limoges University Hospital, France
| | | | - Catherine Yardin
- Department of Cytology, Histology, Cytogenetics and Cellular Biology, Limoges University Hospital, France; Limoges University, CNRS, XLIM, UMR 7252, F-87000 Limoges, France
| |
Collapse
|
5
|
Vuillaume ML, Delrue MA, Naudion S, Toutain J, Fergelot P, Arveiler B, Lacombe D, Rooryck C. Expanding the clinical phenotype at the 3q13.31 locus with a new case of microdeletion and first characterization of the reciprocal duplication. Mol Genet Metab 2013; 110:90-7. [PMID: 23920044 DOI: 10.1016/j.ymgme.2013.07.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Revised: 07/11/2013] [Accepted: 07/11/2013] [Indexed: 11/30/2022]
Abstract
Congenital deletions at the 3q13.31 locus have been recently described as a novel microdeletion syndrome characterized by developmental delay, postnatal overgrowth, hypoplastic male genitalia and characteristic facial features. A common critical region of overlapping of 580kb was delineated including two strong candidate genes for developmental delay: DRD3 and ZBTB20. In this report, we describe a new case of 3q13.31 microdeletion identified by array-CGH in a 16year-old girl sharing clinical features commonly observed in the 3q13.31 microdeletion syndrome. This girl had a microdeletion of 7.39Mb spanning the common critical region of overlapping. More interestingly, we report for the first time the existence of a microduplication reciprocal to the microdeletion syndrome. This familial 2.76Mb microduplication identified by array-CGH was carried by two brothers and their father. The phenotype shared by the brothers resembled the phenotype related to the 3q13.31 microdeletion syndrome including especially severe intellectual disability, developmental delay, behavioral abnormalities and obesity. This microduplication involves three strong candidate genes for the developmental delay ZBTB20, LSAMP and GAP43. Further molecular characterization showed that DRD3, another strong candidate gene for developmental delay, was not included in the duplicated region. However, a dosage alteration of this gene cannot be completely excluded as the duplication was inverted at proximity of this gene, as revealed by FISH analysis. Finally, we hypothesized that the phenotype shared by the two brothers could be related to a gene dosage imbalance even if gene expression could not be measured in relevant tissues such as brain or adipocytes.
Collapse
Affiliation(s)
- Marie-Laure Vuillaume
- CHU Bordeaux, Service de Génétique Médicale, Place Amélie Raba Léon, Bordeaux, France.
| | | | | | | | | | | | | | | |
Collapse
|
6
|
Chromosome 18q-syndrome and 1p terminal duplication in a patient with bilateral vesico-ureteral reflux: case report and literature revision. Ital J Pediatr 2013; 39:6. [PMID: 23343423 PMCID: PMC3599261 DOI: 10.1186/1824-7288-39-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2012] [Accepted: 01/08/2013] [Indexed: 11/29/2022] Open
Abstract
Background Vesico-ureteral reflux (VUR) is a dynamic event in which a retrograde flow of urine is present into the upper tracts. VUR may occur isolated or in association with other congenital abnormalities or as part of syndromic entities. We present a patient with a bilateral primary VUR, syndromic disease caused by a large deletion of 18q (18q21.3-qter) and terminal duplication of 1p (1p36.32-p36.33). Case report The patient was 8 years old female with a disease including moderate growth retardation, psychomotor retardation, facial dysmorphism, single umbilical artery, umbilical hernia, urachal remnant, bilateral congenital clubfeet and renal-urinary disease. Chromosomal analysis and Array-CGH revealed two heterozygous chromosomal rearrangements: 1p terminal duplication and de novo 18q terminal deletion. She referred to our clinic to evaluation of bilateral hydronephrosis and right renal cortex thinning. Voiding cystourethrography demonstrated bilateral grade IV VUR and dimercaptosuccinic acid renal scintigraphy confirmed right renal cortex thinning and showed a cortical uptake of 75% of the left kidney and 25% of the right kidney. The patient underwent ureterovesical reimplantation after failure of 3 endoscopic submeatal Deflux injections with VUR resolution. Conclusions This is the first report involving a patient with 18q-syndrome and contemporary presence of 1p chromosomal terminal duplication. The coexistence of two chromosomal rearrangements complicates the clinical picture and creates a chimeric disorder (marked by characteristics of both chromosomal anomalies). Kidney problems, primarily VUR is reported in 15% of patients affected by 18-q syndrome and no cases is reported in the literature regarding a correlation between VUR and 1p36 chromosomal duplication.
Collapse
|
7
|
Oh EK, Kim YW, Kim IW, Liu HB, Lee KH, Chun HJ, Park DC, Oh EJ, Lee AW, Bae SM, Ahn WS. Differential DNA copy number aberrations in the progression of cervical lesions to invasive cervical carcinoma. Int J Oncol 2012; 41:2038-46. [PMID: 23023522 DOI: 10.3892/ijo.2012.1644] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2012] [Accepted: 06/21/2012] [Indexed: 11/06/2022] Open
Abstract
Host genomic alterations in addition to human papillomavirus (HPV) are needed for cervical precursor lesions to progress to invasive cancer because only a small percentage of women infected by the virus develop disease. However, the genomic alterations during the progression of cervical lesions have not been systematically examined. The aim of this study was to identify differential genomic alterations among cervical intraepithelial neoplasia CIN1, CIN2, CIN3 and cervical squamous cell carcinoma (SCC). Genomic alterations were examined for 15 cases each of CIN1, CIN2, CIN3 and SCC by array-based comparative genomic hybridization (array CGH). The chromosomal regions showing significant differential in DNA copy number aberrations (DCNAs) among CIN1, CIN2, CIN3 and SCC were successfully identified by resampling-based t-test. The chromosomal regions of 5q35.3 and 2q14.3 showed significant DCNAs between CIN1 and CIN2, and between CIN2 and CIN3, respectively, while a significant difference in DCNAs between CIN3 and SCC was observed at 1q24.3, 3p14.1, 3p14.2, 5q13.2, 7p15.3, 7q22.1 and 13q32.3. In addition, the status of DCNAs in 1q43, 2p11.2, 6p11.2, 7p21.1, 7p14.3, 10q24.1, 13q22.3, 13q34 and 16p13.3 was conserved throughout the progression of CIN to SCC. The presence of differential and common DCNAs among CIN1, CIN2, CIN3 and SCC supports that the CIN progression may include continual clonal selection and evolution. This approach also identified 34 probe sets consistently overexpressed when amplified, suggesting an unbiased identification of candidate genes in SCC during cervical cancer progression.
Collapse
Affiliation(s)
- Eun Kyeong Oh
- Department of Obstetrics and Gynecology, The Catholic University of Korea, Seocho-ku, Seoul 137-040, Republic of Korea
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Giannikou K, Fryssira H, Oikonomakis V, Syrmou A, Kosma K, Tzetis M, Kitsiou-Tzeli S, Kanavakis E. Further delineation of novel 1p36 rearrangements by array-CGH analysis: narrowing the breakpoints and clarifying the "extended" phenotype. Gene 2012; 506:360-8. [PMID: 22766398 DOI: 10.1016/j.gene.2012.06.060] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Accepted: 06/19/2012] [Indexed: 11/15/2022]
Abstract
High resolution oligonucleotide array Comparative Genome Hybridization technology (array-CGH) has greatly assisted the recognition of the 1p36 contiguous gene deletion syndrome. The 1p36 deletion syndrome is considered to be one of the most common subtelomeric microdeletion syndromes and has an incidence of ~1 in 5000 live births, while respectively the "pure" 1p36 microduplication has not been reported so far. We present seven new patients who were referred for genetic evaluation due to Developmental Delay (DD), Mental Retardation (MR), and distinct dysmorphic features. They all had a wide phenotypic spectrum. In all cases previous standard karyotypes were negative. Array-CGH analysis revealed five patients with interstitial 1p36 microdeletion (four de novo and one maternal) and two patients with de novo reciprocal duplication of different sizes. These were the first reported "pure" 1p36 microduplication cases so far. Three of our patients carrying the 1p36 microdeletion syndrome were also found to have additional pathogenetic aberrations. These findings (del 3q27.1; del 4q21.22-q22.1; del 16p13.3; dup 21q21.2-q21.3; del Xp22.12) might contribute to the patients' severe phenotype, acting as additional modifiers of their clinical manifestations. We review and compare the clinical and array-CGH findings of our patients to previously reported cases with the aim of clearly delineating more accurate genotype-phenotype correlations for the 1p36 syndrome that could allow for a more precise prognosis.
Collapse
Affiliation(s)
- Krinio Giannikou
- Department of Medical Genetics, Medical School, University of Athens, Greece.
| | | | | | | | | | | | | | | |
Collapse
|
9
|
Chen CP, Su YN, Chern SR, Hsu CY, Tsai FJ, Wu PC, Lee CC, Chen YT, Lee MS, Wang W. Inv dup del(9p): prenatal diagnosis and molecular cytogenetic characterization by fluorescence in situ hybridization and array comparative genomic hybridization. Taiwan J Obstet Gynecol 2011; 50:67-73. [PMID: 21482378 DOI: 10.1016/j.tjog.2011.01.038] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/11/2010] [Indexed: 11/28/2022] Open
Abstract
OBJECTIVE To present molecular cytogenetic characterization of prenatally detected inverted duplication and deletion of 9p, or inv dup del(9p). MATERIALS, METHODS, AND RESULTS A 35-year-old primigravid woman underwent amniocentesis at 16 weeks of gestation because of advanced maternal age. Amniocentesis revealed a derivative chromosome 9, or der(9) with additional material at the end of the short arm of one chromosome 9. Parental karyotypes were normal. Level II ultrasound showed ventriculomegaly and normal male external genitalia. Repeated amniocentesis was performed at 20 weeks of gestation. Array comparative genomic hybridization revealed a 0.70-Mb deletion at 9p24.3 and an 18.36-Mb duplication from 9p24.3 to 9p22.1. The distal 9p deletion encompassed the genes of DOCK8, ANKRD15, FOXD4, DMRT1, and DMRT3. Fluorescence in situ hybridization analysis using bacterial artificial chromosome clone probes specific for 9p confirmed that the der(9) was derived from the inv dup del(9p). The karyotype of the fetus was 46,XY,inv dup del(9)(:p22.1-->p24.3::p24.3-->qter)dn or 46,XY,der(9) del(9)(p24.3) inv dup(9)(p22.1p24.3)dn. Polymorphic DNA marker analysis determined a maternal origin of the inv dup del(9p). A 512-g male fetus was subsequently terminated at 22 weeks of gestation with facial dysmorphism. The fetus had normal male external genitalia without sex reversal. CONCLUSION Fluorescence in situ hybridization and array comparative genomic hybridization are useful to determine the nature of a prenatally detected aberrant chromosome derived from the inv dup del. Male fetuses with inv dup del(9p) and haploinsufficiency of DMRT1 and DMRT3 may present normal male external genitalia without sex reversal.
Collapse
Affiliation(s)
- Chih-Ping Chen
- Department of Obstetrics and Gynecology, Mackay Memorial Hospital, Taipei, Taiwan.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Nicoulaz A, Rubi F, Lieder L, Wolf R, Goeggel-Simonetti B, Steinlin M, Wiest R, Bonel H, Schaller A, Gallati S, Conrad B. Contiguous ∼16 Mb 1p36 deletion: Dominant features of classical distal 1p36 monosomy with haplo-lethality. Am J Med Genet A 2011; 155A:1964-8. [DOI: 10.1002/ajmg.a.33210] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2009] [Accepted: 10/13/2009] [Indexed: 11/08/2022]
|
11
|
Vera-Carbonell A, López-Expósito I, Bafalliu JA, Ballesta-Martínez M, Glóver G, Llópis C, Moya-Quiles R, Suela J, Fernández A, Guillén-Navarro E. Molecular characterization of a new patient with a non-recurrent inv dup del 2q and review of the mechanisms for this rearrangement. Am J Med Genet A 2010; 152A:2670-80. [PMID: 20799321 DOI: 10.1002/ajmg.a.33613] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
We report on newborn baby with microcephaly, facial anomalies, congenital heart defects, hypotonia, wrist contractures, long fingers, adducted thumbs, and club feet. Cytogenetic studies revealed an inverted duplication with terminal deletion (inv dup del) of 2q in the patient and a paternal 2qter deletion polymorphism. Microsatellite markers demonstrated that the inv dup del was maternal in origin and intrachromosomal. Intra or interchromosomal rearrangements may cause this aberration either by a U-type exchange (end-to-end fusion), an unequal crossover between inverted repeats (non-allelic homologous recombination: NAHR), or through breakage-fusion-bridge (BFB) cycles leading to a sister chromatid fusion by non-homologous end joining (NHEJ). A high-resolution oligo array-CGH (244 K) defined the breakpoints and did not detect a single copy region with a size exceeding 12.93 Kb in the fusion site. The size of the duplicated segment was 38.75 Mb, extending from 2q33.1 to 2q37.3 and the size of the terminal deletion was 2.85 Mb in 2q37.3. Our results indicate that the inv dup del (2q) is likely a non-recurrent chromosomal rearrangement generated by a NHEJ mechanism. The major clinical characteristics associated with this 2q rearrangement overlap with those commonly found in patients with 2q duplication reported in the literature.
Collapse
Affiliation(s)
- Ascensión Vera-Carbonell
- Sección de Citogenética, Centro de Bioquímica y Genética Clínica, Hospital U. Virgen de la Arrixaca, Murcia, Spain
| | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Velagaleti GVN, Tonk VS, Hakim NM, Wang X, Zhang H, Erickson-Johnson MR, Medeiros F, Oliveira AM. Fusion of HMGA2 to COG5 in uterine leiomyoma. ACTA ACUST UNITED AC 2010; 202:11-6. [PMID: 20804914 DOI: 10.1016/j.cancergencyto.2010.06.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Accepted: 06/08/2010] [Indexed: 01/12/2023]
Abstract
Uterine leiomyomas are smooth muscle tumors most commonly seen in middle-aged women. Approximately 10% of these tumors contain rearrangements of the chromatin-remodeling gene HMGA2 at the chromosome band 12q14.3. Herein, we report on a uterine leiomyoma with a novel HMGA2 fusion gene. A 44-year-old woman presented with a 20-cm mass uterine leiomyoma. From a histological standpoint, the tumor exhibited extensive hyalinization, very low mitotic activity (<1/10 HPH), and no cytologic atypia. Smooth muscle differentiation was confirmed by the expression of smooth muscle actin and desmin. Standard cytogenetic analysis showed the reciprocal translocation t(7;12)(q31.2;q14.3). Fluorescence in situ hybridization analysis confirmed a balanced rearrangement of the HMGA2 locus in 80% of the cells. 3'RACE reverse-transcription polymerase chain reaction identified the fusion of HMGA2 exon 4 to the COG5 locus on 7q31 (component of oligomeric golgi complex 5 isoform). The fusion sequence is predicted to encode a 96-amino acid chimeric protein that retains all three DNA-binding domains (AT hooks) of HMGA2, but that is shorter than the original HMGA2 protein. Since the general structure of the fusion gene is similar to other previously described HMGA2 fusions, its biologic activity is predicted to be likely similar.
Collapse
|
13
|
Leclercq S, Maincent K, Baverel F, Tessier DL, Letourneur F, Lebbar A, Dupont JM. Molecular cytogenetic characterization of the first reported case of inv dup del 20p compatible with a U-type exchange model. Am J Med Genet A 2009; 149A:437-45. [PMID: 19206177 DOI: 10.1002/ajmg.a.32640] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Inverted duplications with terminal deletions have been reported for an increasing number of chromosome ends. The best characterized and most frequent rearrangement reported involves the short arm of chromosome 8. It derives from non-allelic homologous recombination (NAHR) between two inverted LCRs (low copy repeats) of the olfactory receptor (OR) gene cluster during maternal meiosis. We report here on the cytogenetic characterization of the first inversion duplication deletion involving the short arm of chromosome 20 (inv dup del 20p) in an 18-month-old boy presenting with clinical signs consistent with 20p trisomy syndrome. This abnormality was suspected on karyotyping, but high-resolution molecular cytogenetic investigations were required to define the breakpoints of the rearrangement and to obtain insight into the mechanism underlying its formation. The duplicated region was estimated to be 18.16 Mb in size, extending from 20p13 to 20p11.22, and the size of the terminal deletion was estimated at 2.02 Mb in the 20p13 region. No single copy region was detected between the deleted and duplicated segments. As neither LCR nor inversion was identified in the 20p13 region, the inv dup del (20p) chromosome abnormality probably did not arise by NAHR. The most likely mechanism involves a break in the 20p13 region, leading to chromosome instability and reparation by U-type exchange or end-to-end fusion.
Collapse
Affiliation(s)
- Sandrine Leclercq
- AP-HP, Université Paris-Descartes, Faculté de médecine Unité de Cytogénétique, Groupe Hospitalier Cochin-Saint Vincent de Paul, Paris, France.
| | | | | | | | | | | | | |
Collapse
|
14
|
Chen E, Obolensky E, Rauen KA, Shaffer LG, Li X. Cytogenetic and array CGH characterization of de novo 1p36 duplications and deletion in a patient with congenital cataracts, hearing loss, choanal atresia, and mental retardation. Am J Med Genet A 2008; 146A:2785-90. [DOI: 10.1002/ajmg.a.32437] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
15
|
Jeon JP, Shim SM, Nam HY, Baik SY, Kim JW, Han BG. Copy number increase of 1p36.33 and mitochondrial genome amplification in Epstein-Barr virus-transformed lymphoblastoid cell lines. ACTA ACUST UNITED AC 2007; 173:122-30. [PMID: 17321327 DOI: 10.1016/j.cancergencyto.2006.10.010] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2006] [Revised: 10/17/2006] [Accepted: 10/19/2006] [Indexed: 11/22/2022]
Abstract
Array CGH has been applied to detect chromosomal aberrations in cancer and genetic diseases. Epstein-Barr virus (EBV)-infected B lymphocytes are transformed to continuously proliferating lymphoblastoid cell lines (LCLs), which are a very common genome resource for human genetic studies. We used bacterial artificial chromosome (BAC) array CGH to assess a chromosomal aberration of LCLs in EBV-induced B-cell transformation. At early passages, LCLs exhibited a greater copy number variation in 1p36.33 compared to primary B-cells. Quantitative polymerase chain reaction (PCR) confirmed the increase in the copy number in 1p36.33. Because a segment of 1p36.33 is nearly identical to a part of the mitochondrial DNA, this increase was attributed to an increase in the copy number of mitochondrial DNA. The expression levels of mitochondrial biogenesis-related genes were elevated in the LCLs, which is consistent with the increased copy numbers of mitochondrial DNA, suggesting that increased mitochondrial biogenesis is indicative of the progression of EBV-mediated B-cell transformation. In addition, our array CGH of LCLs revealed potential copy number polymorphisms of chromosomal segments among Korean populations. Taken together, these findings suggest that LCLs in the early passages preserve the chromosomal integrity of primary B-cells at the cytogenetic level during EBV-transformed B-cell immortalization, except for a copy number variation in 1p36.33 due to increased mitochondrial DNA copy numbers. Thus, analyses of array CGH profiles of diseases should take into account the potential for copy number variation of 1p36.33.
Collapse
MESH Headings
- Aneuploidy
- Cell Line, Transformed
- Cell Transformation, Viral/genetics
- Chromosomes, Artificial, Bacterial/genetics
- Chromosomes, Human, Pair 1/genetics
- DNA, Mitochondrial/genetics
- Gene Amplification
- Gene Expression
- Genome, Human/genetics
- Herpesvirus 4, Human/physiology
- Humans
- Lymphocytes/metabolism
- Lymphocytes/pathology
- Lymphocytes/virology
- Microarray Analysis/methods
- Mitochondrial Proteins/genetics
- Nucleic Acid Hybridization/methods
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Reverse Transcriptase Polymerase Chain Reaction
Collapse
Affiliation(s)
- Jae-Pil Jeon
- BioBank for Health Sciences, Center for Genome Science, National Institute of Health, Korea Center for Disease Control and Prevention, 5 Nokbun, Eunpyung-Gu, Seoul 122-701, Republic of Korea
| | | | | | | | | | | |
Collapse
|
16
|
Thienpont B, Gewillig M, Fryns JP, Devriendt K, Vermeesch J. Molecular cytogenetic characterization of a constitutional complex intrachromosomal 4q rearrangement in a patient with multiple congenital anomalies. Cytogenet Genome Res 2006; 114:338-41. [PMID: 16954676 DOI: 10.1159/000094223] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2005] [Accepted: 01/09/2006] [Indexed: 01/07/2023] Open
Abstract
Constitutional Complex Chromosomal Rearrangements (CCRs) are very rare. While the vast majority of CCRs involve more than one chromosome, only seven cases describe CCRs with four or more breakpoints within a single chromosome. Here, we present a patient with multiple congenital anomalies and mental retardation. Array Comparative Genomic Hybridisation (array CGH), FISH and Multicolour Banding FISH revealed a de novo complex rearrangement with two deletions, a duplication and an inversion of 4q. This CCR involving at least seven breakpoints is one of the most complex rearrangements of a single chromosome reported thus far. Potential mechanisms generating such complex rearrangements are discussed.
Collapse
Affiliation(s)
- B Thienpont
- Center for Human Genetics, University Hospital Leuven, Leuven, Belgium
| | | | | | | | | |
Collapse
|