scholarly journals Prevalence and Physical Distribution of SRY in the Gonads of a Woman with Turner Syndrome: Phenotypic Presentation, Tubal Formation, and Malignancy Risk

2017 ◽  
Vol 88 (3-4) ◽  
pp. 291-297 ◽  
Author(s):  
Tamar G. Baer ◽  
Christopher E. Freeman ◽  
Claudia Cujar ◽  
Mahesh Mansukhani ◽  
Bahadur  Singh ◽  
...  
Keyword(s):  
Turner Syndrome ◽  
Y Chromosome ◽  
Sex Chromosome ◽  
Heterogeneous Distribution ◽  
Gonadal Tissue ◽  
Malignancy Risk ◽  
Monosomy X ◽  
Increased Risk ◽  
A Cell ◽  
Chromosome Material

Although monosomy X is the most common karyotype in patients with Turner syndrome, the presence of Y chromosome material has been observed in about 10% of patients. Y chromosome material in patients with Turner syndrome poses an increased risk of gonadoblastoma and malignant transformation. We report a woman with a diagnosis of Turner syndrome at 12 years of age, without signs of virilization, and karyotype reported as 46,X,del(X)(q13). At 26 years, cytogenetic studies indicated the patient to be mosaic for monosomy X and a cell line that contained a du­plicated Yq chromosome. Bilateral gonadectomy was performed and revealed streak gonads, without evidence of gonadoblastoma. Histological analysis showed ovarian stromal cells with few primordial tubal structures. FISH performed on streak gonadal tissue showed a heterogeneous distribution of SRY, with exclusive localization to the primordial tubal structures. DNA extraction from the gonadal tissue showed a 6.5% prevalence of SRY by microarray analysis, contrasting the 86% prevalence in the peripheral blood sample. This indicates that the overall gonadal sex appears to be determined by the majority gonosome complement in gonadal tissue in cases of sex chromosome mosaicism. This case also raises questions regarding malignancy risk associated with Y prevalence and tubal structures in gonadal tissue.

Y chromosome in Turner syndrome: detection of hidden mosaicism and the report of a rare X;Y translocation case

2014 ◽  
Vol 26 (8) ◽  
pp. 1176 ◽  
Author(s):  
Adriana Valéria Sales Bispo ◽  
Pollyanna Burégio-Frota ◽  
Luana Oliveira dos Santos ◽  
Gabriela Ferraz Leal ◽  
Andrea Rezende Duarte ◽  
...  
Keyword(s):  
Turner Syndrome ◽  
Y Chromosome ◽  
Sex Chromosome ◽  
Genetic Disorder ◽  
In Situ Hybridisation ◽  
Normal Female ◽  
Fluorescence In Situ Hybridisation ◽  
Partial Monosomy ◽  
Chromosome Mosaicism ◽  
Increased Risk

Turner syndrome (TS) is a common genetic disorder in females associated with the absence of complete or parts of a second sex chromosome. In 5–12% of patients, mosaicism for a cell line with a normal or structurally abnormal Y chromosome is identified. The presence of Y-chromosome material is of medical importance because it results in an increased risk of developing gonadal tumours and virilisation. Molecular study and fluorescence in situ hybridisation approaches were used to study 74 Brazilian TS patients in order to determine the frequency of hidden Y-chromosome mosaicism, and to infer the potential risk of developing malignancies. Additionally, we describe one TS girl with a very uncommon karyotype 46,X,der(X)t(X;Y)(p22.3?2;q11.23) comprising a partial monosomy of Xp22.3?2 together with a partial monosomy of Yq11.23. The presence of cryptic Y-chromosome-specific sequences was detected in 2.7% of the cases. All patients with Y-chromosome-positive sequences showed normal female genitalia with no signs of virilisation. Indeed, the clinical data from Y-chromosome-positive patients was very similar to those with Y-negative results. Therefore, we recommend that the search for hidden Y-chromosome mosaicism should be carried out in all TS cases and not be limited to virilised patients or carriers of a specific karyotype.

Clinical phenotype and management of individuals with mosaic monosomy X with Y chromosome material stratified by genital phenotype

2021 ◽  
Author(s):  
Lindsey Guzewicz ◽  
Susan Howell ◽  
Canice E. Crerand ◽  
Hailey Umbaugh ◽  
Natalie J. Nokoff ◽  
...  
Keyword(s):  
Y Chromosome ◽  
Clinical Phenotype ◽  
Monosomy X ◽  
Chromosome Material

scholarly journals The Hypothesis of the Prolonged Cell Cycle in Turner Syndrome

2021 ◽  
Author(s):  
Francisco Álvarez-Nava
Keyword(s):  
Cell Cycle ◽  
Turner Syndrome ◽  
Low Birthweight ◽  
Sex Chromosome ◽  
Heart Diseases ◽  
Cellular Growth ◽  
Proliferating Cells ◽  
Cycle Frequency ◽  
Increased Risk ◽  
New Findings

Turner syndrome (TS) is a chromosomal disorder that is caused by a missing or structurally abnormal second sex chromosome. Subjects with TS are at an increased risk of developing intrauterine growth retardation, low birthweight, short stature, congenital heart diseases, infertility, obesity, dyslipidemia, hypertension, insulin resistance, type 2 diabetes mellitus, metabolic syndrome, and cardiovascular diseases (stroke and myocardial infarction). The underlying pathogenetic mechanism of TS is unknown. The assumption that X chromosome-linked gene haploinsufficiency is associated with the TS phenotype is questioned since such genes have not been identified. Thus, other pathogenic mechanisms have been suggested to explain this phenotype. Morphogenesis encompasses a series of events that includes cell division, the production of migratory precursors and their progeny, differentiation, programmed cell death and integration into organs and systems. The precise control of the growth and differentiation of cells is essential for normal development. The cell cycle frequency and the number of proliferating cells are essential in cell growth. 45,X cells have a failure to proliferate at a normal rate, leading to a decreased cell number in a given tissue during organogenesis. A convergence of data indicates an association between a prolonged cell cycle and the phenotypical features in Turner syndrome. This review aims to examine old and new findings concerning the relationship between a prolonged cell cycle and TS phenotype. These studies reveal a diversity of phenotypic features in TS that could be explained by reduced cell proliferation. The implications of this hypothesis for our understanding of the TS phenotype and its pathogenesis are discussed. It is not surprising that 45,X monosomy leads to cellular growth pathway dysregulation with profound deleterious effects on both embryonic and later stages of development. The prolonged cell cycle could represent the beginning of the pathogenesis of TS, leading to a series of phenotypic consequences in embryonic/fetal, neonatal, pediatric, adolescence, and adulthood life.

scholarly journals Occurrence of Gonadoblastoma in Females with Turner Syndrome and Y Chromosome Material: A Population Study*

2000 ◽  
Vol 85 (9) ◽  
pp. 3199-3202 ◽  
Author(s):  
Claus Højbjerg Gravholt ◽  
Jens Fedder ◽  
Rune Weis Naeraa ◽  
Jørn Müller
Keyword(s):  
Risk Factor ◽  
Turner Syndrome ◽  
Y Chromosome ◽  
Carcinoma In Situ ◽  
Dna Analysis ◽  
Epidemiological Studies ◽  
Histopathological Evaluation ◽  
Primer Sets ◽  
Chromosome Material

Abstract The presence of Y chromosome material in patients with Turner syndrome is a risk factor for the development of gonadoblastoma. However, no cases with gonadoblastoma or other ovarian malignancies have been found in epidemiological studies of cancer, morbidity, or mortality in Turner syndrome. We examined 114 females with Turner syndrome for the presence of Y chromosome material by PCR. Initially, five different primer sets were used. Y Chromosome-positive individuals were further examined with an additional four primer sets. We found 14 (12.2%; 95% confidence interval, 6.9–19.7%) patients who had Y chromosome material. The karyotype in 7 of these patients did not suggest the presence of Y chromosome material. Seven of the patients had been ovariectomized before entering the study due to verified Y chromosome material, whereas three patients were operated upon after the DNA analysis. The histopathological evaluations showed that 1 of the 10 ovariectomized patients actually had a gonadoblastoma. The rest of the patients did not have gonadoblastoma or carcinoma in situ on histopathological evaluation. Three patients (age, >50 yr) positive for Y chromosome material chose not to have ovariectomy performed, and detailed ultrasonographies did not suggest the presence of gonadoblastoma. The frequency of Y chromosome material is high in Turner syndrome (12.2%), but the occurrence of gonadoblastoma among Y-positive patients seems to be low (7–10%), and the risk may have been overestimated in previous studies, perhaps due to problems with selection bias. This study emphasizes the need for prospective unbiased studies.

scholarly journals Turner syndrome: counseling prior to oocyte donation

2007 ◽  
Vol 125 (2) ◽  
pp. 112-114 ◽  
Author(s):  
Ester Silveira Ramos
Keyword(s):  
Turner Syndrome ◽  
Y Chromosome ◽  
Hormone Replacement ◽  
Genetic Diagnosis ◽  
Typical Feature ◽  
Oocyte Donation ◽  
Chromosomal Alterations ◽  
Increased Risk ◽  
Molecular Investigation

Ovarian failure is a typical feature of Turner syndrome (TS). Patients are followed clinically with hormone replacement therapy (HRT) and inclusion in the oocyte donation program, if necessary. For patients with spontaneous puberty, genetic counseling regarding preimplantation genetic diagnosis and prenatal diagnosis is indicated. Patients with dysgenetic gonads and a Y chromosome are at increased risk of developing gonadoblastoma. Even though this is not an invasive tumor, its frequent association with other malignant forms justifies prophylactic gonadectomy. It is important to perform gonadectomy before HRT and pregnancy with oocyte donation. Among patients with TS stigmata and female genitalia, many have the Y chromosome in one of the cell lines. For this reason, all patients should undergo cytogenetic analysis. Nevertheless, in cases of structural chromosomal alterations or hidden mosaicism, the conventional cytogenetic techniques may be ineffective and molecular investigation is indicated. The author proposes a practical approach for investigating women with TS stigmata in whom identification of the X or Y chromosome is important for clinical management and follow-up.

scholarly journals Risk of Gonadoblastoma Development in Patients with Turner Syndrome with Cryptic Y Chromosome Material

2017 ◽  
Vol 8 (3) ◽  
pp. 166-173 ◽  
Author(s):  
Ahreum Kwon ◽  
Sei Eun Hyun ◽  
Mo Kyung Jung ◽  
Hyun Wook Chae ◽  
Woo Jung Lee ◽  
...  
Keyword(s):  
Turner Syndrome ◽  
Y Chromosome ◽  
Chromosome Material

scholarly journals Y Chromosome Material in Turner Syndrome

Cureus ◽  
2021 ◽  
Author(s):  
Abdullah Baris Akcan ◽  
Osman K Boduroğlu
Keyword(s):  
Turner Syndrome ◽  
Y Chromosome ◽  
Chromosome Material

scholarly journals Dysgerminoma in a female with turner syndrome and Y chromosome material: A case-based review of literature

2012 ◽  
Vol 16 (3) ◽  
pp. 436 ◽  
Author(s):  
SunilKumar Kota ◽  
JayaPrakash Pani ◽  
LalitKumar Meher ◽  
Kotni Gayatri ◽  
SivaKrishna Kota ◽  
...  
Keyword(s):  
Turner Syndrome ◽  
Y Chromosome ◽  
Review Of Literature ◽  
Chromosome Material ◽  
Case Based

Undifferentiated Gonadal Tissue, Y Chromosome Instability, and Tumors in XY Gonadal Dysgenesis

2011 ◽  
Vol 14 (6) ◽  
pp. 445-459 ◽  
Author(s):  
Mélanie Beaulieu Bergeron ◽  
Nicole Lemieux ◽  
Pierre Brochu
Keyword(s):  
Y Chromosome ◽  
Germ Cells ◽  
Gonadal Dysgenesis ◽  
Chromosome Instability ◽  
Neoplastic Transformation ◽  
Gonadal Tissue ◽  
Xy Gonadal Dysgenesis ◽  
Y Chromosomes ◽  
Increased Risk ◽  
Cytogenetic Analyses

Patients with XY gonadal dysgenesis are at increased risk of developing gonadal tumors. The etiology of several cases of XY gonadal dysgenesis remains unknown, but X/XY gonadal mosaicism has been hypothesized to play a role. At the histologic level, the presence of persistent primitive sex cords containing immature germ cells in dysgenetic gonads (an entity called undifferentiated gonadal tissue, or UGT) was recently described, and these immature germ cells are thought to be at risk of neoplastic transformation. To further investigate both these aspects, we retrospectively studied the gonads from 30 patients with pure (22) and mixed (8) gonadal dysgenesis. Cytogenetic analyses performed on 35 gonads revealed that structurally abnormal Y chromosomes were lost in a majority of cells from the gonads, explaining the gonadal dysgenesis of patients bearing a rearranged Y chromosome. On the other hand, normal Y chromosomes were less often lost in gonads of patients with gonadal dysgenesis. At the histologic level, 43 of the 51 gonads presented areas characteristic of a streak; 13 of these streak gonads also presented areas of UGT. Structures resembling sex cords but without germ cells were found in many of the streaks not containing UGT, suggesting that UGT was initially present. Of the 13 gonads containing both UGT and a streak, 9 developed a tumor. The proximity of UGT with the tumors as well as the immunostaining patterns (PLAP+, OCT3/4+, and CD117/KIT+) suggests that germ cells found in UGT are a risk factor for gonadal tumors.

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