X0 Karyotype Research Articles

Bicuspid Aortic Valve Disease in Turner Syndrome: A Meta-Analysis of Prevalence

Turner syndrome patients partially or completely lack the X chromosome. 1 - 2500 female live births are affected. Clinical features include webbed neck, short stature, broad chest etc. Bicuspid aortic valve disease (BAV) occurs in more than 30% of Turner syndrome patients causing significant morbidity and mortality. We aimed to establish a more reliable estimate of the prevalence of BAV in Turner syndrome. PubMed, Embase and PsycINFO databases were searched until 2022. Review Manager (RevMan 5.4.1) and the JASP software (0.16.00) were used for meta-analysis. 15 studies with a total of 3189 patients were combined. The pooled prevalence of BAV in Turner syndrome was 22.0% (95% CI: 15.0% - 29.0%). Sub group analysis by 45, X0 karyotype and age had prevalence of 24.0% and 8% respectively. The studies had high heterogeneity and possible publication biases. In summary, the study established that the prevalence of BAV in Turner syndrome patients diagnosed by echocardiogram, CT and MRI scans, is 22.0%, and 24% in patients with true monosomy 45, X0 karyotypes. Routine BAV exam should pay particular attention to monosomy 45, X0 karyotype patients, and where possible, CT and MRI should always accompany echocardiography for BAV screening, especially for pediatrics.

Single-step surgical procedure for total replacement of the thoracic aorta in a case of Turner syndrome

Turnersyndrome(TS)isawell-definedautosomaldominantgenetic syndrome caused by a partial or complete monosomy of the chromosome X(45,X0). Cardiovascular complications are mostly responsible forreducedlifeexpectancy.Themaincardiacabnormalitiesarebicuspid aortic valve and aortic coarctation in approximately 16% and 11% of the patients, respectively [1]. A dilatation of major vessels is also observed, above all of the aorta and of the carotid and the brachial arteries. Aortic disease in TS is characterizedbya “connective tissue disorder”similarto that seen in Marfansyndrome. Ascending aorta dilatation is observed in 33% of the cases, and the incidence of aortic dissection is much higher than for women in general, occurring in the third and fourth decades of life [2]. We present a case of TS with bicuspid aortic valve plus hypoplastic aortic arch and chronic aneurysm of the descending thoracic aorta. Informed consent was obtained by the patient. The patient, a 38-year-old woman (Body Surface Area: 1.34 m 2 ; Aortic Size Index: 2.6 cm/m 2 ) with 45,X0 karyotype diagnosed at birth, presented a bicuspid aortic valve, an aortic coarctation, a left superior vena cava and patent ductus arteriosus. At 11 months, she underwent surgical repair of isthmic coarctation and patent ductus closure. After that, she was followed by regular examinations until the age of six, when she was operated on for an excision of a supravalvular mitral stenosis. During the following years, the patient had a normal quality of life up to 38 years when an echocardiogram showed mild aortic regurgitation

The dorsum of hand-foot edema to diagnosis: Turner Syndrome

The dorsum of hand-foot edema to diagnosis: Turner Syndrome Turner’s syndrome (TS) is one of the most common chromosomal abnormalities with an estimated frequency among female live birth of 1/4000-8000. In this article, we presented a 10 day-old girl who admitted with carpal-pedal edema, with 45, X0 karyotype. The literature about Turner’s syndrome was reviewed.

Chronic Idiopathic Neutropenia In Adults: Clinical Features In a 4-Year Prospective Study

Chronic idiopathic neutropenia (CIN) is a rare acquired hematological condition, defined by an absolute neutrophil count (ANCs) lower than 1.8 x103/µL in white and 1.5 x103/µL in black people for more than 3 months, either in the absence or in the presence of anti-neutrophils antibodies (autoimmune forms). CIN is usually diagnosed after the exclusion of congenital and secondary forms. The former are usually marked by frequent and severe infections, that occur early in life, and by and increased risk of evolution to acute myeloid leukemia or myelodisplastic syndromes. In this prospective study we followed up 56 patients with CIN (21 males and 35 females, median age 55 years, range 25-86 years) for a median time of 48 months from January 2009 (10 patients had a previous follow-up of 8 years and 2 of 10 years), focusing on 1) severity of neutropenia, 2) ANCs variations (by general estimating equations GEE models), 3) positivity for anti-neutrophil antibodies (by direct and indirect granulocyte immunofluorescence test), 4) bone marrow features, 5) incidence of infectious episodes, and 6) evolution to definite clonal hematologic diseases (hairy cell leukemia HCL, chronic expansion of NK cells and myelodisplastic syndrome MDS). The mean ANCs were stably under the normal range (1.5-6.5 x103/µL) at all the time points considered; by GEE analysis, a great inter-subject variability was observed during the follow-up (p=0.012), whereas no significant intra-subject variations were found. Considering the severity of neutropenia, 21 patients (47%) showed neutrophils lower than 1x103/µL at enrollment (median 0.49 x103/µL, range 0.1-0.969 x103/µL), and 8 cases <0.5 x103/µL. The mean ANCs observed during the follow up were significantly lower in males than in females (p=0.023) and in cases with mild splenomegaly, although not significantly (11 cases, 20%, mean maximal diameter 11,4 cm by ultrasonography), independently from gender (multivariate analysis). Anti-neutrophil antibodies were detected in 19/56 patients (34%), and mean ANCs values over the follow up were significantly lower in positive versus negative cases (p=0.027). Lymphocyte values greater than the upper normal value of our series (3.4 x103/µL) were observed in 5/56 patients (9%). By peripheral blood immunophenotyping (N=23), 13 (56.5%) patients displayed absolute NK+ cells greater than 0.2 x103/mL (normal NK cut-off value), but all under below 2 x103/µL. Bone marrow evaluation was performed in 27 patients: median cellularity was 35% (range 13-75), and 10/27 (37%) displayed a value lower than 25% (threshold for hypocellularity in aplastic anemia); 19/27 (70%) showed some dysplastic cells, even if less than 10% dysplastic cells and without coexistent MDS-related karyotype; cytogenetic was normal in 24 cases (89%), while 3 males, all older than 60 years, displayed a 45, X0 karyotype (7, 6 and 3 metaphases respectively. Finally, 10 patients (18%) showed monocytosis, and 6 (10%) a MGUS. An infection needing oral antibiotic or antiviral therapy occurred in 13 patients (25%) (2 pneumonias, 7 upper respiratory tract, 3 Herpes Zoster Virus and 1 urinary tract infections), without relationship with the patient's mean ANCs value, the nadir of ANC value, nor with the presence of anti-neutrophil antibodies. During the follow-up, because of suspected progression/evolution, 14 patients were re-evaluated by bone marrow biopsy or peripheral immune-phenotyping: 4 cases were diagnosed with chronic NK expansion, 4 with HCL, and 2 with MDS, one refractory cytopenia with unilineage dysplasia (RCUD) and one with multilineage dysplasia (RCMD). No association was found between evolution and ANCs, both as values at enrolment and mean counts over the follow up, nor with gender, presence of anti-neutrophils antibodies, monocytosis, splenomegaly, electrophoresis abnormalities and infections. All 4 patients, who developed an NK-expansion, showed peripheral lymphocytes >3.4 x103/µL at enrolment (>5x103/µL in only 1 case), and 3 cases displayed increased NK cells at peripheral immune-phenotyping (p= 0.018). In conclusion, CIN in adults is a benign disease, with an infectious rate not superior to that of the general population and a great variability in ANCs values. During this prospective observation, 10 CIN patients evolved, reaching the criteria for clonal hematological diseases, suggesting that this condition deserves clinical follow up. Disclosures:No relevant conflicts of interest to declare.

Application of QF‐PCR for the prenatal assessment of discordant monozygotic twins for fetal sex

To establish the utility of quantitative fluorescent polymerase chain reaction (QF-PCR) in order to determine the zygosity of multiple pregnancies, as well as to define the origin of the most frequent aneuploidies in amniotic fluid samples. We describe the case of a monochorionic (MC) diamniotic (DA) pregnancy with phenotypically discordant twins (nuchal cystic hygroma and non-immune hydrops in twin A and no anomalies in twin B). QF-PCR was performed for rapid prenatal diagnosis in uncultured amniocytes and subsequently in cultured cells. Polymorphic markers for chromosomes X, Y, 13, 18 and 21 were used for determination of zygosity as well as sex chromosome aneuploidy. Twin A showed a Turner Syndrome (TS) mosaicism pattern by QF-PCR in uncultured amniocytes. The monozygotic origin of the pregnancy was determined. Interphase fluorescence in situ hybridization (I-FISH) in this sample showed a mosaicism X0/XY (83/17%). Cytogenetic analysis revealed a 45,X0 karyotype in twin A and a 46,XY karyotype in twin B. QF-PCR is a reliable tool for the determination of the zygosity independently of the chorionicity and the fetal sex in case of twin pregnancy. Testing both direct and cultured cells can provide useful results for genetic counselling in chromosomal mosaicisms.

Intractable epilepsy in Turner syndrome associated with bilateral perisylvian hypoplasia: one case report

Turner syndrome (TS) is the most frequent sex abnormality in females, generally associated with a 45,X0 karyotype. Although neurological complications are frequently part of the clinical picture, serious brain abnormalities are quite rare in TS. Epilepsy in TS is not frequent and so far only few cases have been reported, usually associated with cortical dysplasias. We report a Turner patient showing severe neurological impairment, refractory epilepsy and MRI finding of bilateral perisylvian hypoplasia. The possible dysgenetic role of X-chromosome on cortical morphogenesis is also discussed.

Depression, Levels of Anxiety and Self-Concept in Girls with Turner's Syndrome

Self-esteem, depressive symptoms and anxiety symptoms in girls with Turner's syndrome (TS) were compared to those in girls with familial short stature (FSS) and healthy controls (NC). Eleven girls with TS, 9-17 years of age, all with 45,X0 karyotype, who were matched with 11 girls with FSS and 11 NC girls who had similar socio-demographic characteristics, were enrolled in the study. The Children's Depression Inventory (CDI), State-Trait Anxiety Inventory for Children (STAIC), and Piers-Harris Children's Self Concept Scale (PHSCS) were used to assess the extent of depression, anxiety and self reported self-esteem. The PHSCS means and standard deviations of the TS, FSS and NC groups were 56.2 +/- 6.7, 62.7 +/- 6.9, and 69.3 +/- 6.0, and the STAIC-state anxiety means and standard deviations were 30.6 +/- 4.5, 28.8 +/- 6.1, and 25.7 +/- 3.7, respectively. Study findings showed that girls with TS had lower self-esteem and higher state anxiety levels than NC (p <0.05). In spite of the small sample size, findings showed that girls with TS were at risk of psychological problems. Therefore, in addition to medical treatment and monitoring, girls with TS should also be supported psychologically by social, educational and psychotherapeutic interventions which aim to address their self-esteem and emotional difficulties.

Loss of the Y chromosome in bone marrow cells: results on 1907 consecutive cases of leukaemia and preleukaemia

Loss of the Y chromosome with a resulting 45, X0 karyotype is observed in normal bone marrow cells of elderly males but also in haematological malignancies. Whether Y loss in neoplastic cells is related to the process seen in normal ageing or is part of the carcinogenic process is unknown. The present study concerns the cytogenetic data from 1907 consecutive leukaemic or preleukaemic male patients with special regard to the presence or absence of the Y chromosome. Sixty-five patients (3.4%) had a 45, X-Y clone in their bone marrow (BM) cells. Loss of Y was rare below the age of 50 but increased in older patients, reaching 25% of the men over 80. Sixteen patients (0.08%) had more than 90% X0 cells in their BM. A correlation between Y loss and leukaemia could be established in seven cases, three of which were acute myeloid leukaemia M2 subtype where -Y is known to be a secondary event. In three other cases, -Y was part of a complex karyotype. Only one patient exhibited a 45, X0 karyotype, with no other rearrangement, that could be positively correlated with the neoplastic process.

Spontaneous growth in turner syndrome: Evidence for a minor pubertal growth spurt

Spontaneous growth of 141 untreated girls with Turner syndrome was analysed. Of the patients 25% were born prematurely; their weight and height were normal when compared to prematurely born healthy infants. However, birth weight and height was significantly retarded in Turner patients born at term. A curve for height and growth velocity for the age range 0-16 years was constructed with a sensitive statistical method. By use of a mathematical model equations were created for calculating z-scores and the related percentiles for the height of individual patients at given age. Median height of 18 untreated patients at 18 years was 143.8 cm. Analysis of growth velocity revealed a minor but significant growth spurt at the age of 12.5 years. This growth spurt was also detectable in patients without signs of spontaneous puberty and occurred later in patients with 45,X0 karyotype. Bone age progression was linear up to the age of 7.5 years and decelerated thereafter.

A sterile male with 45,X0 and a Y;22 translocation

Cytogenetic analysis of a 20-year-old sterile male revealed a 45,X0 karyotype with no evidence for Y-chromosomal material on any of the chromosomes analysed by Q-, G- and C-banding. DNA analysis with 17 different Y chromosome-derived probes revealed the presence of Yp DNA sequences in the patient's genome. In situ hybridization with the Yp-derived probe pJA36B disclosed a translocation of Y-chromosomal material onto the short arm of a chromosome 22.

Tissue-specific 45,X0/47,XY,+13 mosaicism in an 18-year-old woman

The case of an 18-year-old woman with a 47,XY,+13 karyotype in lymphocytes and a 45,X0 karyotype in all other tissue analyzed is presented. The proposita shows no stigmata of the Patau syndrome and no masculinization.

Turner syndrome: spontaneous growth in 150 cases and review of the literature.

The spontaneous growth of 150 patients with Turner syndrome from three German centers--90 with 45,X0 constitution, 60 with other chromosomal abnormalities--has been analyzed. The mean adult height was found to be (n = 14) 146.8 cm. It was observed that growth in these patients can be divided into four phases: (1) Intrauterine growth, which is retarded; (2) Height development, which is normal up to a bone-age of about 2 years; (3) Between a bone-age of 2 and 11 years when stunting of growth is most marked; (4) After a bone-age of 11 years--the time at which puberty should normally start--the growth phase is prolonged, but total height gain is only little below normal levels. No difference in height could be observed between cases with X0 karyotype and other chromosomal variants. The data are compared with those in the literature.

Partial trisomy 4q: Two cases with a familial translocation t(4;18)(q27;q23)

Clinical and cytogenetic data of two related patients, both trisomic for the segment 4q27 to qter, are reported. Familial studies determined that the mothers of the two probands were carriers of the same balanced translocation between chromosomes 4 and 18. Altogether, two partial trisomies 4q, five balanced karyotypes, and one 45,X0 karyotype were found in the family. The 18 cases reported to date are reviewed with respect to the karyotype-phenotype correlation.

XO karyotype in a phenotypic male.

A 24-year-old male with ambiguous genitalia was found to have a predominantly 45,X chromosomal constitution. The clinical and cytological findings in this patient are presented in the report. The possible mode of origin of this aberrant phenotype due to chromosome mosaicism of 45,X/46,XY type during early embryogenesis and subsequent elimination of 46,XY cell line is discussed.