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Bauerly E, Hughes SE, Vietti DR, Miller DE, McDowell W, Hawley RS. Discovery of supernumerary B chromosomes in Drosophila melanogaster. Genetics 2014; 196:1007-16. [PMID: 24478336 PMCID: PMC4286233 DOI: 10.1534/genetics.113.160556] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Accepted: 01/25/2014] [Indexed: 01/29/2023] Open
Abstract
B chromosomes are small, heterochromatic chromosomes that are transmitted in a non-Mendelian manner. We have identified a stock of Drosophila melanogaster that recently (within the last decade) acquired an average of 10 B chromosomes per fly. These B chromosomes are transmitted by both males and females and can be maintained for multiple generations in a wild-type genetic background despite the fact that they cause high levels of 4(th) chromosome meiotic nondisjunction in females. Most curiously, these B chromosomes are mitotically unstable, suggesting either the absence of critical chromosomal sites or the inability of the meiotic or mitotic systems to cope with many additional chromosomes. These B chromosomes also contain centromeres and are primarily composed of the heterochromatic AATAT satellite sequence. Although the AATAT sequence comprises the majority of the 4(th) chromosome heterochromatin, the B chromosomes lack most, if not all, 4(th) chromosome euchromatin. Presumably as a consequence of their heterochromatic content, these B chromosomes significantly modify position-effect variegation in two separate reporter systems, acting as enhancers of variegation in one case and suppressors in the other. The identification of B chromosomes in a genetically tractable organism like D. melanogaster will facilitate studies of chromosome evolution and the analysis of the mechanisms by which meiotic and mitotic processes cope with additional chromosomes.
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Affiliation(s)
| | - Stacie E. Hughes
- Stowers Institute for Medical Research, Kansas City, Missouri 64110
| | - Dana R. Vietti
- Department of Child Health, University of Missouri School of Medicine, Columbia, Missouri 65201
| | - Danny E. Miller
- Stowers Institute for Medical Research, Kansas City, Missouri 64110
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, Kansas 66160
| | - William McDowell
- Stowers Institute for Medical Research, Kansas City, Missouri 64110
| | - R. Scott Hawley
- Stowers Institute for Medical Research, Kansas City, Missouri 64110
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, Kansas 66160
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2
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Wang L, Hara K, Van Baaren JM, Price JC, Beecham GW, Gallins PJ, Whitehead PL, Wang G, Lu C, Slifer MA, Züchner S, Martin ER, Mash D, Haines JL, Pericak-Vance MA, Gilbert JR. Vitamin D receptor and Alzheimer's disease: a genetic and functional study. Neurobiol Aging 2012; 33:1844.e1-9. [PMID: 22306846 DOI: 10.1016/j.neurobiolaging.2011.12.038] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Revised: 12/22/2011] [Accepted: 12/28/2011] [Indexed: 11/24/2022]
Abstract
Genetic studies on late-onset Alzheimer's disease (AD) have repeatedly mapped susceptibility loci onto chromosome 12q13, encompassing the vitamin D receptor (VDR) gene. Epidemiology studies have indicated vitamin D insufficiency as a risk factor for AD. Given that VDR is the major mediator for vitamin D's actions, we sought to clarify the role of VDR in late-onset AD. We conducted an association study in 492 late-onset AD cases and 496 controls with 80 tagging single nucleotide polymorphisms (SNPs). The strongest association was found at a promoter SNP rs11568820 (P = 9.1 × 10(-6), odds ratio (OR) = 1.69), which resides within the transcription factor Cdx-2 binding site and the SNP has been also known as CDX2. The risk-allele at rs11568820 is associated with lower VDR promoter activity (p < 10(-11)). The overexpression of VDR or vitamin D treatment suppressed amyloid precursor protein (APP) transcription in neuroblastoma cells (p < 0.001). We provide both statistical evidence and functional data suggesting VDR confers genetic risk for AD. Our findings are consistent with epidemiology studies suggesting that vitamin D insufficiency increases the risk of developing AD.
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Affiliation(s)
- Liyong Wang
- Hussman Institute for Human Genomics, University of Miami Miller School of Medicine 1501 NW 10 Ave, Miami, Florida, USA
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3
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Fickelscher I, Starke H, Schulze E, Ernst G, Kosyakova N, Mkrtchyan H, MacDermont K, Sebire N, Liehr T. A further case with a small supernumerary marker chromosome (sSMC) derived from chromosome 1--evidence for high variability in mosaicism in different tissues of sSMC carriers. Prenat Diagn 2007; 27:783-5. [PMID: 17546703 DOI: 10.1002/pd.1776] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A prenatally ascertained case with a de novo small supernumerary marker chromosome (sSMC) derived from chromosome 1 is reported. Due to a fetal heart defect the parents decided in favour of an induced abortion. Postmortem, a molecular cytogenetic study on eleven formalin fixed, paraffin-embedded tissues of the fetus was performed, to further characterize the levels of mosaicism of the sSMC(1). sSMC presence varied between 13 and 62% within different tissues of sSMC carriers. This finding is something common in sSMC carriers and could explain why up to the present no clinical correlations for sSMC mosaicism and clinical outcome in the corresponding carriers could be established.
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Affiliation(s)
- Ina Fickelscher
- Institute of Human Genetics and Anthropology, Kollegiengasse 10, Jena, Germany
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Shim SH, Lee CH, Park YJ, Lee HJ, Park WI, Cho YH. Two inv dup(15) chromosomes in a woman with repeated abortions. AMERICAN JOURNAL OF MEDICAL GENETICS 2001; 104:303-6. [PMID: 11754065 DOI: 10.1002/ajmg.10082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A 40-year-old, phenotypically normal woman, with a history of two repeated abortions and no child, had two additional, small, bisatellited, and apparently metacentric chromosomes. Various banding and microsatellite analyses indicated that the additional chromosomes were inv dup(15)(q11q11) without the Prader-Willi/Angelman syndromes critical region, and therefore without phenotypic effects. Her father had a single, identical additional inv dup(15) chromosome. Her husband was chromosomally normal, but sperm analysis indicated a reduced motility and a reduced frequency of morphologically normal sperm. In view of these findings, it was deduced that the inv dup(15) chromosome in the father was transmitted in duplicate to the woman. Individuals with two additional inv dup(15) chromosomes in the literature were reviewed, and possible correlation of the two additional inv dup(15) chromosomes in the woman and her repeated abortions was discussed.
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Affiliation(s)
- S H Shim
- Department of Medical Genetics, College of Medicine, Hanyang University, Seoul 133-791, Korea
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5
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Gorla N, Slavutsky I, Lisanti J, Pedrazzini E, Vanella L, Larripa I. Cytogenetic characterization of an extra structurally abnormal chromosome associated with severe mental retardation: inv dup (15) (q13). Hereditas 1998; 129:1-5. [PMID: 9868924 DOI: 10.1111/j.1601-5223.1998.t01-1-00001.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
We have studied an extra structually abnormal chromosome (ESAC) in a 13 years old boy with profound mental, psychomotor and speech retardation, behavioral problems, seizures and abnormal electroencephalogram. The examination of the bisatellited ESAC with chromosome banding demonstrated that the karyotype was: 47, XY, +inv dup (15) (pter-->q13::q13-->pter). The cytogenetic characterization of the inv dup (15) is reported with special emphasis on the usefulness of DA/DAPI staining when G-banding is sequentially performed to discard possible heteromorphisms in DA/DAPI positive chromosomes, and the importance of Ag-NOR heteromorphisms to ascertain the maternal origin of the inv dup (15). A U-type exchange between two non-sister chromatids is proposed as its mechanism of formation. The clinical features of the case were consistent with those previously reported in similar cases.
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Affiliation(s)
- N Gorla
- Universidad Nacional de Río Cuarto (UNRC), Argentina
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Schroer RJ, Phelan MC, Michaelis RC, Crawford EC, Skinner SA, Cuccaro M, Simensen RJ, Bishop J, Skinner C, Fender D, Stevenson RE. Autism and maternally derived aberrations of chromosome 15q. AMERICAN JOURNAL OF MEDICAL GENETICS 1998; 76:327-36. [PMID: 9545097 DOI: 10.1002/(sici)1096-8628(19980401)76:4<327::aid-ajmg8>3.0.co;2-m] [Citation(s) in RCA: 250] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Of the chronic mental disabilities of childhood, autism is causally least well understood. The former view that autism was rooted in exposure to humorless and perfectionistic parenting has given way to the notion that genetic influences are dominant underlying factors. Still, identification of specific heritable factors has been slow with causes identified in only a few cases in unselected series. A broad search for genetic and environmental influences that cause or predispose to autism is the major thrust of the South Carolina Autism Project. Among the first 100 cases enrolled in the project, abnormalities of chromosome 15 have emerged as the single most common cause. The four abnormalities identified include deletions and duplications of proximal 15q. Other chromosome aberrations seen in single cases include a balanced 13;16 translocation, a pericentric inversion 12, a deletion of 20p, and a ring 7. Candidate genes involved in the 15q region affected by duplication and deletion include the ubiquitin-protein ligase (UBE3A) gene responsible for Angelman syndrome and genes for three GABA(A) receptor subunits. In all cases, the deletions or duplications occurred on the chromosome inherited from the mother.
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Affiliation(s)
- R J Schroer
- Greenwood Genetic Center, South Carolina 29646, USA
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Reeser SL, Donnenfeld AE, Miller RC, Sellinger BS, Emanuel BS, Driscoll DA. Prenatal diagnosis of the derivative chromosome 22 associated with cat eye syndrome by fluorescence in situ hybridization. Prenat Diagn 1994; 14:1029-34. [PMID: 7877950 DOI: 10.1002/pd.1970141104] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Cytogenetic studies of cultured amniocytes demonstrated a karyotype of 46,XX/47,XX, +mar. A bisatellited, dicentric, distamycin-DAPI negative, NOR-positive marker was present in 76 per cent of the metaphases examined. Similar markers have been associated with cat eye syndrome (CES). We report on the utilization of fluorescence in situ hybridization (FISH) with a 14/22 alpha-satellite probe and a chromosome 22-specific cosmid for locus D22S9 to determine the origin of the prenatally detected supernumerary marker chromosome. FISH studies demonstrated that the marker is a derivative of chromosome 22 and enabled us to provide the family with additional prognostic information.
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Affiliation(s)
- S L Reeser
- Department of Obstetrics and Gynecology, Pennsylvania Hospital, Philadelphia
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Grammatico P, Di Rosa C, Roccella M, Falcolini M, Pelliccia A, Roccella F, Del Porto G. Inv dup(15): contribution to the clinical definition of phenotype. Clin Genet 1994; 46:233-7. [PMID: 7820937 DOI: 10.1111/j.1399-0004.1994.tb04232.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
One of the primary goals in medical genetics is a precise clinical definition of chromosomal diseases. This is now possible because of the increased number of case reports and new techniques. A male patient, without a clear-cut syndrome, was cytogenetically investigated. Chromosomal analysis showed a small unidentified bisatellited supernumerary marker. In situ hybridization with a biotin-labeled DNA probe for the chromosome 15 centromere (D15Z1) demonstrated that the marker was derived from chromosome 15. Hybridization with the Prader-Willi Syndrome Cosmid biotinylated probe (localized to band 15q11-q13) showed a signal on both ends suggesting a marker with a symmetrical inv dup(15) and a breakpoint localized in q13. It was then possible to define the karyotype as: 47,XY,+ inv dup(15) (pter-q13::q13-pter). All cases of inv dup(15) reported in the literature were reviewed, paying particular attention to the different breakpoints involved, in order to provide a better clinical definition of this syndrome.
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Affiliation(s)
- P Grammatico
- Cattedra di Genetica Medica, Università La Sapienza Rome, Italy
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9
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Affiliation(s)
- T Webb
- Department of Clinical Genetics, Birmingham Maternity Hospital, Edgbaston, Birmingham
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Luke S, Verma RS, Giridharan R, Conte RA, Macera MJ. Two Prader-Willi/Angelman syndrome loci present in an isodicentric marker chromosome. AMERICAN JOURNAL OF MEDICAL GENETICS 1994; 51:232-3. [PMID: 7521122 DOI: 10.1002/ajmg.1320510312] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
We found an abnormal 47,XX,+mar karyotype in a patient with developmental delay, hypotonia, microcephaly, failure to thrive, and cognitive delay. When metaphases were hybridized with Prader-Willi and Angelman loci-specific probes by the FISH technique, two sites were noted at opposite positions on the marker chromosome. The alphoid satellite DNA probe documented the isodicentric nature while retention of the p arms on both sides of the marker chromosome was demonstrated by beta satellite probe. The patient does not exhibit manifestations of either syndrome despite the presence of these loci in tetrasomic dose. The present investigation suggests that other marker chromosomes be reevaluated, as their clinical manifestations are quite variable.
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Affiliation(s)
- S Luke
- Division of Genetics, Long Island College Hospital, Brooklyn, New York
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Callen DF, Eyre H, Yip MY, Freemantle J, Haan EA. Molecular cytogenetic and clinical studies of 42 patients with marker chromosomes. AMERICAN JOURNAL OF MEDICAL GENETICS 1992; 43:709-15. [PMID: 1377870 DOI: 10.1002/ajmg.1320430412] [Citation(s) in RCA: 94] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The molecular cytogenetic characterization and clinical details of 20 patients with marker chromosomes are presented. These 20 patients, together with another 22 patients previously published, represent a cohort in which the chromosomal origin of the marker chromosomes was successfully determined in all but one case. Examination of the pooled data suggests that the satellited markers derived from chromosomes 14, 15 (when metacentric or submetacentric), those whose origin is either 13 or 21, and those small ring autosomal markers derived from both alphoid and satellite II or III pericentric heterochromatin of chromosomes 1, 9, 15, and 16 are all associated with a low risk of phenotypic abnormality. The markers identified as i(18p), ring chromosomes derived from various autosomes, and satellited markers derived from chromosome 22 are associated with a high risk of phenotypic abnormality. The phenotype of patients with acrocentric markers derived from chromosome 15 was equivocal, perhaps as a result of imprinting. Additional data are required to confirm these trends. The mild mental retardation and abnormal face of a patient with a small ring chromosome derived from chromosome 4 are described. Identification of patients with small rings originating from particular chromosomes may allow the recognition of new syndromes.
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Affiliation(s)
- D F Callen
- Department of Cytogenetics, Adelaide Children's Hospital, South Australia
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12
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Manenti E. Two extra inv dup(15) chromosomes and male infertility: second case. AMERICAN JOURNAL OF MEDICAL GENETICS 1992; 42:402-3. [PMID: 1536192 DOI: 10.1002/ajmg.1320420337] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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13
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Galán F, Aguilar MS, González J, Clemente F, Sánchez R, Tapia M, Moya M. Interstitial 15q deletion without a classic Prader-Willi phenotype. AMERICAN JOURNAL OF MEDICAL GENETICS 1991; 38:532-4. [PMID: 2063892 DOI: 10.1002/ajmg.1320380406] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We report on a newborn boy with pronounced hypotonia, cryptorchidism, minor facial anomalies, congenital heart defect, neurologic anomaly, deafness, renal anomaly, and bifid uvula. The patient has a de novo proximal interstitial deletion of chromosome 15 reaching to band q14, larger than that usually seen in Prader-Willi and Angelman syndromes.
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Affiliation(s)
- F Galán
- Departamento de Pediatría, Universidad de Alicante, Spain
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14
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Herens C, Pierquin G, Verloes A, Schaaps JP, Frederic J. Mosaicism of 46,XX/47,XX,+9/47,XX,+?mar in the same amniotic fluid with apparent loss of one cell line after delivery. Prenat Diagn 1989; 9:373-5. [PMID: 2726702 DOI: 10.1002/pd.1970090513] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A 46,XX;47,XX,+9;47,XX,+?mar karyotype was detected in an amniotic fluid cell culture and confirmed in a subsequent fetal blood sample from a 40-year-old woman. After termination of the pregnancy, none of the 186 mitoses obtained from a second blood sample was trisomic for chromosome 9 (p less than 0.001). Selection against cells containing trisomy 9 is postulated to explain the disappearance of the lymphocyte clone.
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Affiliation(s)
- C Herens
- Human Genetic Department, Liège State University, Belgium
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Kousseff BG, Diamond T, Essig Y, Miller K, Tedesco T. Unique mosaicism in Prader-Labhart-Willi syndrome--a contiguous gene or aneuploidy syndrome? AMERICAN JOURNAL OF MEDICAL GENETICS 1987; 28:803-11. [PMID: 3688018 DOI: 10.1002/ajmg.1320280404] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A 16-year-old boy with Prader-Labhart-Willi syndrome (PLWS) had hypotonia, feeding difficulties, failure to thrive, strabismus and bilateral inguinal hernias with cryptorchidism during infancy followed by hyperphagia, marked early-onset obesity with insulin-dependent diabetes mellitus and necrobiosis lipoidica diabeticorum, short stature, hypogonadotropic hypogonadism and some of the facial characteristics of the individuals with the PLWS. IQ is estimated around 90. Cytogenetic studies showed mosaicism: 45,X, t(Y;15) with partial deletion 15 (15pter----15q12); 46,X, t(Y;15), dic (15)(15pter----15q12::15q12----15pter) and 47, X, t(Y;15), dic(15), dic(15). The dic(15) was bisatellited, NOR-positive on both arms and represented inv dup(15). Thus, the 2 lines with the dic(15) showed partial trisomy 15 (15pter----15q12) and partial pentasomy 15 (15pter----15q12), respectively. The cell line ratios were different in lymphocyte and fibroblast cultures. The unique cytogenetic findings in this patient, the reports of a variety of chromosome 15 aberrations in PLWS, as well as aberrations of other chromosomes, suggest that the condition is a contiguous gene syndrome rather than an aneuploidy syndrome.
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Affiliation(s)
- B G Kousseff
- Division of Medical Genetics, University of South Florida, Tampa 33612-4799
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Sachs ES, Van Hemel JO, Den Hollander JC, Jahoda MG. Marker chromosomes in a series of 10,000 prenatal diagnoses. Cytogenetic and follow-up studies. Prenat Diagn 1987; 7:81-9. [PMID: 2437554 DOI: 10.1002/pd.1970070204] [Citation(s) in RCA: 78] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In a series of 10,000 prenatal diagnoses 15 marker chromosomes were detected in our centre. Six of these were familial whilst nine had originated de novo. They were analysed with various staining methods. DA-DAPI staining was positive in nine out of 12 pregnancies. Six pregnancies were continued. Five normal children were born, one ended in intrauterine fetal death of a normal fetus at 37 weeks. Nine pregnancies were terminated, showing six normal fetuses, one familial cat-eye syndrome, one fetus with Down syndrome caused by additional trisomy 21 and one fetus with cystic kidneys resp. It is concluded that it seems safe to continue the pregnancy in cases of familial marker, identical to that of one parent, whilst a de novo DA-DAPI positive marker seems to present a low risk for fetal anomalies.
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Murdock RL, Wurster-Hill DH. Non-reciprocal translocation (5;15), isodicentric (15) and Prader-Willi syndrome. AMERICAN JOURNAL OF MEDICAL GENETICS 1986; 25:61-9. [PMID: 3799724 DOI: 10.1002/ajmg.1320250108] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A non-reciprocal translocation (5;15) and an isodicentric (15) resulting in trisomy 15pter----15q1?3 and monosomy 5qter [46,XY,-5,-15,+der(5)t(5;15) (5pter----5q35::15q13----15qter),+idic(15) (pter----q1?3::q1?3----pter)] was found in a 28-year-old profoundly retarded male resident of a state institution. Early developmental history and childhood and adult physical findings resembled those of Prader-Willi syndrome (PWS) patients. The parents' unbanded chromosomes were normal. Blood groups of parents and propositus were uninformative with regard to identifying gene deletions or duplications.
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18
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Abstract
A small, non-satellited and metacentric supernumerary chromosome was ascertained in an amniotic fluid cell culture. The supernumerary chromosome was present in four of seven family members karyotyped. Of these four carriers, two were phenotypically normal, while the other two, the fetus and its elder sister, suffered from methylmalonic acidemia. The supernumerary chromosome was apparently stable, being transmitted through three generations without causing mosaicism. It had a single C band, seven G bands and was silver staining negative, a hitherto undescribed situation.
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Miny P, Basaran S, Kuwertz E, Holzgreve W, Pawlowitzki IH. Inv dup (15): prenatal diagnosis and postnatal follow-up. Prenat Diagn 1986; 6:303-6. [PMID: 3748995 DOI: 10.1002/pd.1970060411] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A de novo inv dup (15) was diagnosed at amniocentesis. No physical abnormalities were detected after birth. The boy developed severe mental and motor retardation, which became obvious at 16 months of age.
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20
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Martín-Lucas MA, Pérez-Castillo A, Abrisqueta JA. Infertility associated with two accessory bisatellited chromosomes. Hum Genet 1986; 73:133-6. [PMID: 3459705 DOI: 10.1007/bf00291603] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Two extra bisatellited chromosomes identified as inv dup (15) (pter----q11.2::q11.2----pter) were found in an oligoasthenospermic male. Analysis of Ag-staining in the proband and in one fertile brother with a normal karyotype revealed that nucleolar organizer region (NOR) activity was significantly increased in the patient. The frequency of satellite associations was also significantly higher in the index case, but no correlation was found between NOR activity and acrocentric associations. These results suggest that extra NOR activity and the elevated frequency of satellite associations could predispose to gametogenic impairment.
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