Relationship between Chromosomal Aberrations and Gene Expressions in the p53 Pathway in Chronic Lymphocytic Leukemia.

Chronic lymphocytic leukemia (CLL) is a neoplasm characterized by excessive accumulation of B lymphocytes in the peripheral blood, bone marrow and lymph nodes. We assessed the expressions of 22 genes in the p53 pathway in 30 CLL patients and 15 healthy subjects by a RT2 Profiler PCR (polymerase chain reaction) Array technique and their relation to cytogenetic aberrations detected by fluorescent in situ hybridization (FISH). Our Student's t-test results indicated that ATM, ATR, BAX, CASP9, CDK4, CDKN2A, CHEK1, CHEK2, E2F3, MCL1, MDM2, MDM4, PCNA, RB1, P53 and BCL2 genes were statistically significant (p <0.001). For six genes (APAF1, CDKN1A, E2F1, GADD45A, PTEN and PTX3) were not statistically significant. The ATM, ATR, BAX, CASP9, CDK4, CDKN1A, CDKN2A, CHEK1, CHEK2, MDM2, MDM4, PCNA, RB1, P53, E2F1, GADD45A and BCL2 genes were found to be upregulated by the 2-ᐃᐃCt (relative fold change in gene expression) method. The highest up-regulation was detected in CDKN2A and BCL2 genes, 10.22- and 8.51-fold, respectively. On the other hand, the PTX3 gene with a fold regulation of 1.84 was found to the highest downregulation. Overall, the CDNK2A BCL2 and PTX3 genes are related to the mechanism of the disease in the p53 pathway and may be an important predictor of the prognosis of the disease. The BCL2 gene may be associated with increased risk of developing CLL. We suggest that the PTX3 gene may be considered as a marker associated with CLL disease. The CDKN2A gene expression seems to play a protective role in CLL.

Clinical features and molecular genetic analysis in a Turkish family with oral white sponge nevus.

BACKGROUND: Oral white sponge nevus (WSN) is a rare autosomal dominant benign condition, characterized by asymptomatic spongy white plaques. Mutations in Keratin 4 (KRT4) and 13 (KRT13) have been shown to cause WSN. Familial cases are uncommon due to irregular penetrance. Thus, the aim of the study was: a) to demonstrate the clinical and histopathological features of a three-generation Turkish family with oral WSN b) to determine whether KRT4 or KRT13 gene mutation was the molecular basis of WSN. MATERIAL AND METHODS: Out of twenty members of the family ten were available for assessment. Venous blood samples from six affected and five unaffected members and 48 healthy controls were obtained for genetic mutational analysis. Polymerase chain reaction was used to amplify all exons within KRT4 and KRT13 genes. These products were sequenced and the data was examined for mutations and polymorphisms. RESULTS: Varying presentation and severity of clinical features were observed. Analysis of the KRT13 gene revealed the sequence variant Y118D as the disease-causing mutation. One patient revealed several previously unreported polymorphisms including a novel mutation in exon 1 of the KRT13 gene and a heterozygous deletion in exon 1 of KRT4. This deletion in the KRT4 gene was found to be a common polymorphism reflecting a high allele frequency of 31.25% in the Turkish population. CONCLUSIONS: Oral WSN may manifest variable clinical features. The novel mutation found in the KRT13 gene is believed to add evidence for a mutational hotspot in the mucosal keratins. Molecular genetic analysis is required to establish correct diagnosis and appropriate genetic consultation.

The frequency of C609T polymorphism in the NQO1 gene and its relation to cytogenetic abnormalities in patients with myelodysplastic syndrome.

The aim of the present study is to evaluate the frequency of C609T polymorphism in the NQO1 (NAD(P)H) quinon oxydoreductase) gene and its relation to cytogenetic abnormalities in patients with Myelodysplastic Syndrome (MDS). The study group consisted of 80 patients MDS with 13 of them in the pediatric age group. The frequency of the NQO1 gene polymorphism was compared with a healthy control group involving 423 individuals. Cytogenetic abnormalities were detected in 43 patients (54%). In patients with MDS the overall frequency of the C609T polymorphism was not different than controls. Also, although the frequency of the C609T polymorphism was higher in patients with secondary MDS (sMDS) (OR: 1.893, 95% CI: 0.840-4.265, p=0.238) , 5/del(5q) (OR:1.298, 95% CI: 0.331-5.086,p=0.124), +21(OR:1.817, 95% CI:0.429-7698,p=0.124) and t(8;21) (OR:3.028, 95% CI: 0.604-15.172,p=0.137) groups, the difference did not reach statistical significiance. Our results do not support the view that the C609T polymorphism has a role in the pathogenesis of MDS. Also the frequency of the C609T allele did not seem to be associated with cytogenetic abnormalities.

Evaluation of micronuclear frequencies in both circulating lymphocytes and buccal epithelial cells of patients with oral lichen planus and oral lichenoid contact reactions.

OBJECTIVE: The aim of this study was to evaluate the frequency of micronuclei (MNs) in both circulating lymphocytes and buccal epithelial cells of patients with oral lichenoid contact reactions (OLCRs) or with oral lichen planus (OLP) and compare their MN scores with those of healthy controls (HCs). MATERIAL AND METHODS: The study group included 21 patients (mean age 51.3 ± 12.4; 6 males, 15 females) with OLCRs and 22 patients (mean age 47.6 ± 14.4; 4 males, 18 females) with OLP who were clinically diagnosed and histopathologically confirmed according to WHO diagnostic criteria (WHO Collaborating Centre for Oral Precancerous Lesions, 1978). All patients with OLCR demonstrated contact allergy to tested dental materials when evaluated by skin patch testing according to International Contact Dermatitis Research Group (ICDRG), while all OLP patients tested negative to patch testing. Seventeen individuals with no oral mucosal disorders (mean age 51.7 ± 11.3; 8 males, 9 females) were recruited to constitute the healthy control group. [Correction added on 30 May 2014, after first online publication: the term, 'mean age' has been added to the text in parenthesis throughout the Material and Methods section.] Clinical features including type of OLP, location, disease severity, presence of skin lesions, presence of systemic disease including any allergies and dental (periodontal) status were recorded. MN analyses were performed on peripheral blood lymphocytes and on smears of buccal epithelial cells of all three study groups. RESULTS: Most OLP and OLCR lesions were of reticular type (83%), and OLP lesions were distributed bilaterally on the buccal mucosa (90.5%). The medians of MN frequencies in buccal epithelial cells in OLP and OLCR groups were significantly higher when compared with HC group (P < 0.001). [Correction added on 30 May 2014, after first online publication: in the results, 2nd sentence, the word 'lymphocytes' has been removed.] There was no significant difference between OLP group (14.5 range 3-95) and OLCR group (16.0 range 3-93) in terms of median MN frequencies in buccal epithelial cells (P = 0.724) nor in peripheral lymphocytes between OLP group (2.0 range 0-7) and OLCR group (1.0 range 0-6) (P = 0.92). [Correction added on 30 May 2014, after first online publication: (P = 0.92) was wrongly placed after 'peripheral lymphocytes' and has now been shifted to the end of the last sentence.] CONCLUSIONS: Micronuclei scores do not distinguish OLP from OLCR when using buccal smears. OLP and OLCR both demonstrated significantly higher MN frequencies in buccal cells, compared with healthy controls. MN assessment in both buccal epithelial cells and circulating lymphocytes may serve as a potential biomarker tool for evaluating any cancer risk in OLP and OLCR. [Correction added on 30 May 2014, after first online publication: the first and second sentences in the conclusions have been slightly changed.].

Micronuclear and sister chromatid exchange analyses in peripheral lymphocytes of patients with oral lichen planus--a pilot study.

OBJECTIVE: The purpose of this study was to determine the genetic instability of peripheral blood lymphocytes from patients diagnosed with oral lichen planus (OLP) by investigation of frequencies of micronuclei (MN) and sister chromatid exchange (SCE). MATERIALS AND METHODS: A total of 22 newly diagnosed and untreated patients with OLP of same severity scores and twenty healthy controls participated in this study. They were all non-smokers with no previous history or family history of cancer. The periodontal status, flow rate and buffering capacity of whole mouth saliva were recorded. SCE and MN analyses were performed on peripheral blood lymphocytes of OLP patients and healthy controls. RESULTS: The frequencies of MN (50.00 +/- 22.36) and SCE (6.89 +/- 1.48) in OLP patients were found to be significantly elevated compared with that in normal individuals (25.20 +/- 9.52 and 5.93 +/- 1.31; z = 3.946, P = 0.0001; z = 2.346, P = 0.019). There were no significant differences in the MN frequency and SCE between the two subgroups with reticular or erosive types of OLP. CONCLUSION: These pilot data indicate an increased genomic instability in peripheral blood lymphocytes of a cohort of Turkish patients diagnosed with oral lichen planus as compared with that of healthy individuals. As patients with OLP may have an increased or potential risk for oral malignancy, these assays could be used in translational research to monitor beneficial effects of interventions and long-term prognosis.

The effect of parental consanguinity on the clinical and laboratory findings of rheumatoid arthritis.

AIMS: We aimed to evaluate the frequency of consanguinity among the parents of patients with rheumatoid arthritis (RA) and the influence of parental consanguinity on several clinical and laboratory parameters which reflect the severity of the disease. METHODS AND PATIENTS: The study population consisted of 265 patients with RA which were divided into two groups with respect to the presence or absence of consanguinity between their parents. The frequency of parental consanguinity was compared with the general population. The two groups were compared with respect to family history of RA, the age of onset, the age at which RA was diagnosed, duration of the disease, the presence of rheumatoid nodules, vasculitis, serositis and the need for orthopaedic surgery, amyloidosis, the presence and level of rheumatoid factor and anti-cyclic citrullinated peptide antibodies, erosive changes on radiographs, and the need for anti-tumour necrosis factor therapy. RESULTS: Twenty-one patients (8%) had parents who were consanguineous, which was not more frequent compared with the general population (14%). The mean age of disease onset and the mean age at which RA was diagnosed were lower in patients with parental consanguinity, although the difference was not statistically significant. The other clinical and laboratory parameters were also not different between the two groups. CONCLUSION: The present data suggests that parental consanguinity has no effect on disease severity, and the frequency of consanguinity is not increased among the parents of patients with RA. A possible exception is the earlier disease onset and age at diagnosis which needs to be confirmed by larger studies.

Initial maternal meiotic I error leading to the formation of a maternal i(2q) and a paternal i(2p) in a healthy male.

We report on the investigation of the parental origin and mode of formation of the two isochromosomes, i(2p) and i(2q), detected in a healthy adult male. Conventional cytogenetic analysis revealed the proband's lack of structurally normal chromosomes 2, these being replaced by an i(2p) and an i(2q). Investigation of the parental origin of the isochromosomes revealed a paternal origin of the i(2p) chromosome and a maternal origin of the i(2q) chromosome. Thus, the formation of both isochromosomes, or at least of the paternal i(2p), appears to have occurred postzygotically. Interestingly, whilst a paternal isodisomy was observed for the entire 2p, maternal heterodisomy was detected for two segments of 2q, separated by a segment showing isodisomy. The results are indicative of an initial error (non-disjunction or i(2q) formation) concerning the maternal chromosomes 2 during meiosis I, which likely favored the subsequent mitotic recombination event resulting in the presence of two isochromosomes. To the best of our knowledge this is the first case of an initial meiotic error, followed by postzygotic trisomy rescue through the formation of isochromosomes, resulting in a normal phenotype. A prenatal detection, by cytogenetic and molecular analysis, of such chromosome abnormality would have led to the incorrect conclusion of a most likely poor prognosis for the fetus.

Monitoring the genotoxic effects of radiosynovectomy with Re-186 in paediatric age group undergoing therapy for haemophilic synovitis.

PURPOSE: The aim of this study was to investigate the genotoxic effect on the peripheral blood lymphocytes potentially induced by Re-186 in paediatric age group undergoing radiosynovectomy for haemophilic synovitis, by using chromosomal aberration analysis (CA) and the micronuclei (MN) assay for detecting chromosomal aberrations, as well as the sister chromatid exchanges (SCE) technique for assessing DNA damage. METHODS: Cytogenetic analyses were evaluated in 20 boys (mean age: 13.8 +/- 2.7 years) before, and 2 and 90 days after radiosynovectomy from the peripheral lymphocytes of the patients. Joint retention and extra-articular spread of the radionuclides were evaluated by using quantitative gamma camera imaging. RESULTS: Imaging after radiosynovectomy revealed local lymph node visualization in 8 (40%) patients and hepatosplenic visualization in 3 (15%) patients due to extra-articular leakage of radioactive material. The mean frequency of chromosome aberrations (0.2 +/- 0.4/1000 cells) determined prior to the onset of therapy was not significantly increased in comparison with control values obtained 2 days (0.4 +/- 0.5/1000 cells) and 90 days (0.2 +/- 0.4/1000 cells) after therapy (P = 0.754 and P = 1.0). In the analysis of MN and SCE, when we compare the baseline levels, the mean MN and SCE frequencies were slightly higher in the control analyses performed 2 and 90 days after radiosynovectomy but there were no significant differences between baseline and control levels (chi(2) = 2.621, P = 0.270 and F = 0.573, P = 0.569, respectively). CONCLUSION: The major finding of this study with relatively small sample is that, radiosynovectomy with Re-186 does not seem to induce early genotoxic effects on the peripheral blood lymphocytes in paediatric age group.

A case of progressive pseudorheumatoid arthropathy of 'childhood' with the diagnosis delayed to the fifth decade.

Progressive pseudorheumatoid arthropathy of childhood (PPAC) is a rare single gene disorder which is frequently misdiagnosed as juvenile rheumatoid arthritis. It is characterised with arthralgia, joint contractures, bony swelling of metacarpophalangeal and interphalangeal joints and platyspondyly. Clinical and laboratory signs of joint inflammation such as synovitis, a high erythrocyte sedimentation rate and an elevated C-reactive protein level are usually absent. Although the disease begins early in life (usually between 3 and 8 years of age), the diagnosis may be delayed. In the present case report, we describe a male patient diagnosed with PPAC at the age of 46 years, although he had been exhibiting the typical radiological and clinical features of the disease since the age of 7 years.

A case of mandibuloacral dysplasia presenting with features of scleroderma.

Juvenile scleroderma, a relatively rare condition, may be confused with a number of progeroid syndromes like Hutchinson-Gilford syndrome, Werner syndrome and Rothmund-Thomson syndrome. In this case report, we describe a 9-year-old boy who presented with sclerodactyly, acroosteolysis and scleroderma-like involvement of the skin over hands and feet, which suggested a diagnosis of juvenile scleroderma initially. However, absence of Raynaud's phenomenon, sparing of the skin other than hands and feet and negative serological studies did not support this diagnosis. On the basis of additional findings (micrognathia, dental malformation, a 'beaked nose', open cranial sutures and sparse hair), the patient was diagnosed as mandibuloacral dysplasia, a rare autosomal recessive disease. This case demonstrates that mandibuloacral dysplasia should be considered in the differential diagnosis of juvenile scleroderma in the presence of atypical features such as negative serological studies, absence of Raynaud's phenomenon, sparse hair and micrognathia.

Molecular analyses of the HGO gene mutations in Turkish alkaptonuria patients suggest that the R58fs mutation originated from central Asia and was spread throughout Europe and Anatolia by human migrations.

Alkaptonuria (AKU) is a rare metabolic disorder of phenylalanine catabolism that is inherited as an autosomal recessive trait. AKU is caused by loss-of-function mutations in the homogentisate 1,2-dioxygenase (HGO) gene. The deficiency of homogentisate 1,2-dioxygenase activity causes homogentisic aciduria, ochronosis and arthritis. We present the first molecular study of the HGO gene in Turkish AKU patients. Seven unrelated AKU families from different regions in Turkey were analysed. Patients in three families were homozygous for the R58fs mutation; another three families were homozygous for the R225H mutation; and one family was homozygous for the G270R mutation. Analysis of nine intragenic HGO polymorphisms showed that the R58fs, R225H and G270R Turkish AKU mutations are associated with specific HGO haplotypes. The comparison with previously reported haplotypes associated with these mutations from other populations revealed that the R225H is a recurrent mutation in Turkey, whereas G270R most likely has a Slovak origin. Most interestingly, these analyses showed that the Turkish R58fs mutation shares an HGO haplotype with the R58fs mutation found in Finland, Slovakia and India, suggesting that R58fs is an old AKU mutation that probably originated in central Asia and spread throughout Europe and Anatolia during human migrations.

Chronic renal failure in a patient with Sotos syndrome due to autosomal dominant polycystic kidney disease.

Sotos syndrome is characterised by accelerated growth, acromegalic appearance, mental retardation and social maladjustment. Most cases are sporadic, but familial cases have also been reported. We report a case of Sotos syndrome presenting with chronic renal failure due to autosomal dominant polycystic kidney disease (ADPKD). Ultrasonographic examination of the patient, his father and other family members revealed polycystic kidneys. Renal failure was present only in the Sotos case, who also had considerably larger cysts than other family members. We suggest that the underlying mechanism responsible from the somatic overgrowth in Sotos syndrome may also be linked with the development of larger cysts and earlier onset of renal failure in ADPKD. Although Sotos syndrome has been associated with urological abnormalities, chronic renal failure is very rare. To our knowledge, Sotos syndrome associated with ADPKD has not been reported before.

Sister chromatid exchange frequency in B-cells stimulated by TPA in chronic lymphocytic leukemia.

Chronic lymphocytic leukemia (CLL) is characterised by the clonal proliferation and accumulation of neoplastic B-lymphocytes. The median age of the patients is 65 years, and more men than women are affected. The overwhelming majority of CLLs are of B-cell origin. Chromosomal aberrations have been detected in more than 50% of the B-cells obtained from peripheral blood samples after appropriate stimulation with polyclonal B-cell mitogens. The analysis of sister chromatid exchange is a cytogenetic technique used to show DNA damage due to an exchange of DNA fragments between sister chromatids. In this study, lymphocytes from 22 patients with CLL-B (7 female, 15 male; mean age 64.09 +/- 7.56 years) were stimulated by a B-cell mitogen (TPA) and BrdU added at the 24 h of the culture. Metaphase chromosomes were stained with a fluorescence plus Giemsa technique after a standard harvest procedure. The frequency of sister chromatid exchange was found to be increased significantly P =.02) in patients with CLL-B (8.24 +/- 1.36 per metaphase) compared to controls (7.25 +/- 1.42 per metaphase). We conclude that the increased frequency of sister chromatid exchange in chronic lymphocytic leukemia after stimulation with a B-cell mitogen (TPA) may reflect DNA instability and defective DNA repair in these patients.

A case of Noonan syndrome with pulmonary and abdominal lymphangiectasia.

Noonan syndrome is characterised by a Turner-like phenotype and a normal karyotype. Although it is reported to be associated with abnormalities of the lymphatic system, involvement of the pulmonary lymphatics is rare. We present a case of Noonan syndrome where a whole body scintigraphy revealed lymphangiectasia of the lower extremities, abdomen and lungs.

A case of chronic lymphocytic leukemia with a constitutional pericentric inversion of chromosome 1.

Chronic lymphocytic leukemia (CLL) has been reported to be associated with various chromosomal aberrations, the most common being trisomy 12 and structural rearrangements involving 13q, 11q, and 17p. We present a case of CLL with a constitutional pericentric inversion of chromosome 1.

Genotoxic potential of cyclosporin A in patients with renal transplantation.

We analyzed the induction of sister chromatid exchange (SCE) by cyclosporin A (CsA) as a marker of genotoxic potential. In 30 patients undergoing renal transplantation, SCE induction was tested before the introduction of CsA and 3 months later. We found that SCE frequency increased significantly at the end of 3 months. To our knowledge, this is the first study demonstrating in vivo induction of SCE by CsA in humans. We conclude that CsA has a genotoxic potential on human lymphocytes.

An unusual translocation between 12tel and 14q11 in a large kindred.

In one couple investigated because of recurrent abortions, the female was found to have an unusual translocation between the long arm of the telomeric region of chromosome 12 and the long arm of the chromosome 14 at band q11. We studied ten additional members of the family who were under the risk of the same chromosomal rearrangement, and four of them were found to be carriers. The diagnosis of this translocation was determined using different banding techniques and FISH. The karyotype was found to be 45,XX,t(12;14)(qtel;q11).

47,XYY karyotype in acute myeloid leukemia.

A case of acute myelomonocytic leukemia (AMMoL; M4) with a 47,XYY karyotype is reported. This chromosome aneuploidy was found in both bone marrow cells and mitogen-stimulated lymphocytes. The contribution of XYY chromosomal constitution in the pathogenesis of AMMoL is controversial.