scholarly journals The frequent and clinically benign anomalies of chromosomes 7 and 20 in Shwachman-diamond syndrome may be subject to further clonal variations

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Abdul Waheed Khan ◽  
Alyssa Kennedy ◽  
Elissa Furutani ◽  
Kasiani Myers ◽  
Annalisa Frattini ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Fluorescent In Situ Hybridization ◽  
De Novo ◽  
Chromosome 7 ◽  
Comparative Genomic ◽  
Sequential Samples ◽  
Karyotype Instability ◽  
Shwachman Diamond Syndrome ◽  
Single Bone

Abstract Background An isochromosome of the long arm of chromosome 7, i(7)(q10), and an interstitial deletion of the long arm of chromosome 20, del(20)(q), are the most frequent anomalies in the bone marrow of patients with Shwachman-Diamond syndrome, which is caused in most cases by mutations of the SBDS gene. These clonal changes imply milder haematological symptoms and lower risk of myelodysplastic syndromes and acute myeloid leukaemia, thanks to already postulated rescue mechanisms. Results Bone marrow from fourteen patients exhibiting either the i(7)(q10) or the del(20)(q) and coming from two large cohorts of patients, were subjected to chromosome analyses, Fluorescent In Situ Hybridization with informative probes and array-Comparative Genomic Hybridization. One patient with the i(7)(q10) showed a subsequent clonal rearrangement of the normal chromosome 7 across years. Four patients carrying the del(20)(q) evolved further different del(20)(q) independent clones, within a single bone marrow sample, or across sequential samples. One patient with the del(20)(q), developed a parallel different clone with a duplication of chromosome 3 long arm. Eight patients bore the del(20)(q) as the sole chromosomal abnormality. An overall overview of patients with the del(20)(q), also including cases already reported, confirmed that all the deletions were interstitial. The loss of material varied from 1.7 to 26.9 Mb and resulted in the loss of the EIF6 gene in all patients. Conclusions Although the i(7)(q) and the del(20)(q) clones are frequent and clinically benign in Shwachman Diamond-syndrome, in the present work we show that they may rearrange, may be lost and then reconstructed de novo, or may evolve with independent clones across years. These findings unravel a striking selective pressure exerted by SBDS deficiency driving to karyotype instability and to specific clonal abnormalities.

Association of Extensive Brain Calcifications, Myelofibrosis, and Retinopathy in a 12-Year-Old Child

2008 ◽  
Vol 11 (2) ◽  
pp. 148-151 ◽  
Author(s):  
Diana Negrón ◽  
Lillian Colón-Castillo ◽  
Ilia Morales-Melecio ◽  
María Correa-Rivas
Keyword(s):  
Bone Marrow ◽  
Fluorescent In Situ Hybridization ◽  
Bone Marrow Cells ◽  
Multiorgan Failure ◽  
Rare Condition ◽  
Chromosome 7 ◽  
Neurological Deficits ◽  
Hybridization Study ◽  
History Of

We report a case of a 12-year-old boy with history of myelofibrosis and retinopathy who developed sudden neurological deficits associated with coagulopathy, multiorgan failure, and death. A fluorescent in situ hybridization study revealed monosomy of chromosome 7 in 21% of the bone marrow cells in support of his diagnosis of myelofibrosis. Postmortem neuropathology examination revealed multiple coarse and microcalcifications and cerebral hemorrhages, explaining the patient's neurological deterioration. The findings of myelofibrosis, retinopathy, and cerebral calcifications indicate that this could be a case of a rare condition known as Revesz syndrome.

scholarly journals Congenital Hydrocephalus and Hemivertebrae Associated With De NOVO Partial Monosomy 6q (6q25.3→qter)

2015 ◽  
Vol 18 (1) ◽  
pp. 77-84 ◽  
Author(s):  
Y Li ◽  
K-W Choy ◽  
H-N Xie ◽  
M Chen ◽  
W-Y He ◽  
...  
Keyword(s):  
In Situ Hybridization ◽  
Copy Number ◽  
Fluorescent In Situ Hybridization ◽  
De Novo ◽  
Copy Number Variant ◽  
Terminal Deletion ◽  
Congenital Hydrocephalus ◽  
Comparative Genomic ◽  
Partial Monosomy

AbstractThis study was conducted to describe a prenatal case of congenital hydrocephalus and hemivertebrae with a 6q terminal deletion and to investigate the possible correlation between the genotype and phenotype of the proband. We performed an array-based comparative genomic hybridization (aCGH) analysis on a fetus diagnosed with congenital hydrocephalus and hemivertebrae. The deletion, spanning 10.06 Mb from 6q25.3 to 6qter, was detected in this fetus. The results of aCGH, karyotype and fluorescent in situ hybridization (FISH) analyses in the healthy parents were normal, which confirmed that the proband’s copy- number variant (CNV) was de novo. This deleted region encompassed 97 genes, including 28 OMIM genes. We discussed four genes (TBP, PSMB1, QKI and Pacrg) that may be responsible for hydrocephalus while the T gene may have a role in hemivertebra. We speculate that five genes in the 6q terminal deletion region were potentially associated with hemivertebrae and hydrocephalus in the proband.

scholarly journals Jacobsen syndrome and neonatal bleeding: report on two unrelated patients

2021 ◽  
Vol 47 (1) ◽  
Author(s):  
Gregorio Serra ◽  
Luigi Memo ◽  
Vincenzo Antona ◽  
Giovanni Corsello ◽  
Valentina Favero ◽  
...  
Keyword(s):  
Developmental Delay ◽  
De Novo ◽  
Comparative Genomic ◽  
Fish Analysis ◽  
Variable Degree ◽  
Jacobsen Syndrome ◽  
Contiguous Gene ◽  
Clinical Consequences ◽  
11Q Deletion

Abstract Introduction In 1973, Petrea Jacobsen described the first patient showing dysmorphic features, developmental delay and congenital heart disease (atrial and ventricular septal defect) associated to a 11q deletion, inherited from the father. Since then, more than 200 patients have been reported, and the chromosomal critical region responsible for this contiguous gene disorder has been identified. Patients’ presentation We report on two unrelated newborns observed in Italy affected by Jacobsen syndrome (JBS, also known as 11q23 deletion). Both patients presented prenatal and postnatal bleeding, growth and developmental delay, craniofacial dysmorphisms, multiple congenital anomalies, and pancytopenia of variable degree. Array comparative genomic hybridization (aCGH) identified a terminal deletion at 11q24.1-q25 of 12.5 Mb and 11 Mb, in Patient 1 and 2, respectively. Fluorescent in situ hybridization (FISH) analysis of the parents documented a de novo origin of the deletion for Patient 1; parents of Patient 2 refused further genetic investigations. Conclusions Present newborns show the full phenotype of JBS including thrombocytopenia, according to their wide 11q deletion size. Bleeding was particularly severe in one of them, leading to a cerebral hemorrhage. Our report highlights the relevance of early diagnosis, genetic counselling and careful management and follow-up of JBS patients, which may avoid severe clinical consequences and lower the mortality risk. It may provide further insights and a better characterization of JBS, suggesting new elements of the genotype-phenotype correlations.

scholarly journals Associations between Amplification (1q) and Prior Cancer in a Real-World De Novo Myeloma Cohort

2021 ◽  
Author(s):  
Elizabeth B Lamont ◽  
Andrew J Yee ◽  
Stuart L Goldberg ◽  
David S Siegel ◽  
Andrew D Norden
Keyword(s):  
Real World ◽  
Fluorescent In Situ Hybridization ◽  
De Novo ◽  
Chromosome 1 ◽  
Second Malignancies ◽  
Cancer History ◽  
Screening Strategies ◽  
Cytogenetic Testing

Abstract Genomic biomarkers inform treatment in multiple myeloma (MM) making patient clinical data a potential window into MM biology. We evaluated de novo MM patients for associations between specific MM cytogenetic patterns and prior cancer history. Analyzing a MM real-world dataset (RWD), we identified a cohort of 1,769 patients with fluorescent in-situ hybridization (FISH) cytogenetic testing at diagnosis. Fully 241 patients (0.14) had histories of prior cancer(s). Amplification of the long arm of chromosome 1 [amp(1q)] varied by prior cancer history (0.31 with prior cancer vs 0.24 without; p = .02). No other MM translocations, amplifications, or deletions were associated with prior cancers. Amp(1q) and cancer history remained strongly associated in a logistic regression adjusting for patient demographic and disease attributes. The results merit follow-up regarding carcinogenic treatment effects and screening strategies for second malignancies. Broadly the findings suggest analyses of patient-level phenotypic-genomic RWD may accelerate cancer research through hypothesis generating studies.

Recovery of a telomere-truncated chromosome via a compensating translocation in maize

Genome ◽  
2011 ◽  
Vol 54 (3) ◽  
pp. 184-195 ◽  
Author(s):  
Robert T. Gaeta ◽  
Tatiana V. Danilova ◽  
Changzeng Zhao ◽  
Rick E. Masonbrink ◽  
Morgan E. McCaw ◽  
...  
Keyword(s):  
In Situ Hybridization ◽  
Fluorescent In Situ Hybridization ◽  
Transgene Expression ◽  
De Novo ◽  
Extra Chromosome ◽  
Single Gene ◽  
B Chromosomes ◽  
Chromosome 1 ◽  
Chromosome 6

Maize-engineered minichromosomes are easily recovered from telomere-truncated B chromosomes but are rarely recovered from A chromosomes. B chromosomes lack known genes, and their truncation products are tolerated and transmitted during meiosis. In contrast, deficiency gametes resulting from truncated A chromosomes prevent their transmission. We report here a de novo compensating translocation that permitted recovery of a large truncation of chromosome 1 in maize. The truncation (trunc-1) and translocation with chromosome 6 (super-6) occurred during telomere-mediated truncation experiments and were characterized using single-gene fluorescent in situ hybridization (FISH) probes. The truncation contained a transgene signal near the end of the broken chromosome and transmitted together with the compensating translocation as a heterozygote to approximately 41%–55% of progeny. Transmission as an addition chromosome occurred in ~15% of progeny. Neither chromosome transmitted through pollen. Transgene expression (Bar) cosegregated with trunc-1 transcriptionally and phenotypically. Meiosis in T1 plants revealed eight bivalents and one tetravalent chain composed of chromosome 1, trunc-1, chromosome 6, and super-6 in diplotene and diakinesis. Our data suggest that de novo compensating translocations allow recovery of truncated A chromosomes by compensating deficiency in female gametes and by affecting chromosome pairing and segregation. The truncated chromosome can be maintained as an extra chromosome or together with the super-6 as a heterozygote.

The Prognostic Impact of Fluorescent-in Situ Hybridization (FISH) and Conventional Karyotying in Korean Multiple Myeloma Patients: A Retrospective Multicenter Study.

Blood ◽  
2009 ◽  
Vol 114 (22) ◽  
pp. 4902-4902 ◽  
Author(s):  
Min Jae Kim ◽  
Suk Joong Oh ◽  
Chang Ki Min ◽  
Chong Won Park ◽  
Hwi-Joong Yoon ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Overall Survival ◽  
Fluorescent In Situ Hybridization ◽  
Plasma Cells ◽  
Chromosomal Abnormalities ◽  
Albumin Level ◽  
Complex Karyotype ◽  
Independent Risk Factors ◽  
Univariate Analyses

Abstract Abstract 4902 Introduction Cytogenetics and fluorescent-in situ hybridization (FISH) are important outcome predictors in multiple myeloma (MM). There were only few small studies that investigated prognostic implication of FISH and/or conventional karyotyping in Korean MM patients. We investigated the incidences and prognostic significances of chromosomal abnormalities detected by FISH and/or conventional karyotyping among Korean MM patients. Patients and Methods We collected data of patients from Korean Myeloma Registry and performed retrospective analysis. We compared the survival of patients with chromosomal abnormalities and other clinical findings. Results From 2000 to 2009, total of 801 newly diagnosed myeloma patients were enrolled in this study. Median age of patients was 62 years. Median overall survival was 82 months, and median follow up of time was 92 months. Among the patients who had conventional karyotype analysis, 17.1% were complex karyotype, followed by del13q (7.4%), hyperdiploidy (7.6%), hypodiploidy (3.0%), and t(11;14) (3.9%). Among the patients who had FISH analysis, 22.8% were del 13q, followed by t(11;14) (18.2%), t(4;14) (13.7%), del17p (11.8%) and t(14;16) (5.9%). Univariate analyses revealed that complex karyotype (p<0.01), hypodiploidy (p=0.01), del13q (p<0.01) by conventional karyotyping, and t(4;14) (p=0.04) by FISH negatively impacted the overall survival. Other genomic aberrations did not affect the overall survival. Clinical parameters that impact on overall survival were percentage of plasma cells in bone marrow, serum beta2-microglobulin, creatinine, low hemoglobin, and low albumin levels. On multivariate analysis, percentage of plasma cells in bone marrow (p<0.01) and low serum albumin level (p<0.01) were independent risk factors for overall survival. Conclusions Our results showed that complex karyotype, hypodiploidy, t(4;14), and del13q by FISH and/or conventional karyotyping were negative prognostic factors for overall survival in univariate analyses. On multivariate analysis, low serum albumin level and percentage of plasma cells in bone marrow were independent risk factors for overall survival. In future, prospective trial with laboratory standardization is warranted for more reliable results from FISH and/or conventional karyotyping in MM patients. Disclosures Suh: Janssen Korea: Research Funding.

scholarly journals Neuronal migration genes and a familial translocation t(3;17): which genes are implicated in the phenotype?

2019 ◽  
Author(s):  
Meriam HADJ AMOR ◽  
Sarra Dimassi ◽  
Hanen Hannachi ◽  
Amel Taj ◽  
Adnene Mlika ◽  
...  
Keyword(s):  
Neuronal Migration ◽  
Critical Region ◽  
Fluorescent In Situ Hybridization ◽  
Array Comparative Genomic Hybridization ◽  
Gene Dosage ◽  
Comparative Genomic ◽  
History Of ◽  
Cytogenetic Characterization

Abstract Background: While Miller-Dieker syndrome critical region deletions are well known delineated anomalies, submicroscopic duplications in this region have recently emerged as a new distinctive syndrome. So far, only few cases have been described overlapping 17p13.3 duplications. Methods: In this study, we report on clinical and cytogenetic characterization of two new cases involving 17p13.3 and 3p26 chromosomal regions in two sisters with familial history of lissencephaly. Fluorescent In Situ Hybridization and array Comparative Genomic Hybridization were performed. Results: A deletion including the critical region of the Miller-Dieker syndrome of at least 2,9 Mb and a duplication of at least 3,6 Mb on the short arm of chromosome 3 were highlighted in one case. The opposite rearrangements, duplication 17p13.3 and deletion 3p were seen in the second case. This double chromosome aberration is the result of an adjacent 1:1 meiotic segregation of a maternal reciprocal translocation t(3;17)(p26.2;p13.3). Conclusions: 17p13.3 and 3p26 deletions have a clear range of phenotypic features while duplications still have uncertain clinical significance. However, we could suggest that regardless of the type of the rearrangement, the gene dosage and interactions of CNTN4, CNTN6 and CHL1 in the 3p26 and PAFAH1B1, YWHAE in 17p13.3 could result in different clinical spectrums.

Sign in / Sign up

Export Citation Format

Share Document