Person: ALAVANDA, CEREN
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ALAVANDA
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CEREN
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Publication Metadata only Enostosis in a patient with KBG syndrome caused by a novel missense ANKRD11 variant(2022-07-01) GEÇKİNLİ, BİLGEN BİLGE; ALAVANDA, CEREN; ARMAN, AHMET; GEÇKİNLİ B. B., ALAVANDA C., Ates E. A., Yildirim O., ARMAN A.KBG syndrome (KBGS-OMIM:#148050) is a rare autosomal dominant disease characterized by short stature, intellectual disability, characteristic facies, skeletal anomalies and macrodontia that most commonly affect the permanent upper central incisors. In 2011, Sirmaci et al. (2011) identified heterozygous loss-of-function variants in the ANKRD11 gene on chromosome 16q24.3. So far, more than 150 patients have been reported in the literature. ANKRD11 gene encodes ankyrin repeat domain-containing protein 11 that regulates transcriptional activation (Zhang et al., 2004). Apart from single-nucleotide variations in the ANKRD11 gene, copy number variations on chromosome 16q24.3 can also cause KBG syndrome-like phenotype. In this study, we present a patient with de-novo novel missense variant in ANKRD11 gene. We have also identified skeletal bone enostosis as an additional finding, which is not previously reported.Publication Open Access Novel, homozygous RAB3GAP1 c.2606 + 1G>A, p.Glu830ValfsTer9 variant and chromosome 3q29 duplication in a Turkish individual with Warburg micro syndrome(2023-04-01) ALAVANDA, CEREN; SÖYLEMEZ, MEHMET ALİ; ARMAN, AHMET; Geckinli B., TÜRKYILMAZ A., ALAVANDA C., Sager G., Arslan Ates E., SÖYLEMEZ M. A., ARMAN A.Warburg micro syndrome (WARBM) is a rare, autosomal recessive, neurodevelopmental disorder characterized by microcephaly, cortical dysplasia, corpus callosum hypoplasia, congenital hypotonia leading to subsequent spastic quadriplegia, severe developmental delay and hypogenitalism. Ophthalmologic findings that may affect any ocular segment including characteristic, small, atonic pupils. WARBM is known to be caused by biallelic, pathogenic variants in at least five genes although additional genetic loci may exist. The RAB3GAP1 c.748 + 1G>A, p.Asp250CysfsTer24 founder variant has been described in families of Turkish ancestry. We report the clinical and molecular findings in three, unrelated, Turkish families with WARBM. A novel c.974-2A>G variant causing WARBM in three siblings of Turkish descent was found. Functional studies of the novel, c.2606 + 1G>A variant in patients\" mRNA revealed skipping of exon 22 which results in a premature stop codon in exon 23. However, the clinical consequences of this variant are blended given that the individual also had a maternally inherited chromosome 3q29 microduplication.Publication Open Access Dysosteosclerosis: Clinical and radiological evolution reflecting genetic heterogeneity(2022-08-01) DEMİRCİOĞLU, SERAP; GÜRPINAR TOSUN, BUŞRA; GÜRAN, TÜLAY; BEREKET, ABDULLAH; ALAVANDA, CEREN; ARMAN, AHMET; DEMİRCİOĞLU S., Mumm S., ALAVANDA C., Kaygusuz B. S., GÜRPINAR TOSUN B., ARMAN A., Huskey M., GÜRAN T., Duan S., BEREKET A., et al.Dysosteosclerosis (DSS), the term coined in 1968 for ultrarare dysplasia of the skeleton featuring platyspondyly with focal appendicular osteosclerosis, has become generic by encompassing the genetic heterogeneity recently reported for this phenotype. We studied four unrelated Turkish patients with DSS to advance understanding of the new nosology. Patient 1 suffered femur fractures beginning at age 1 year. DSS was suspected from marked metaphyseal osteosclerosis in early childhood and subsequently platyspondyly accompanying patchy osteosclerosis of her appendicular skeleton. She harbored in SLC29A3, in 2012 the first gene associated with DSS, a unique homozygous duplication (c.303_320dup, p.102_107dupYFESYL). Patient 2 presented similarly with fractures and metaphyseal osteosclerosis but with no platyspondyly at age 2 months. She was homozygous for a novel nonsense mutation in SLC29A3 (c.1284C>G, p.Tyr428*). Patient 3 had ocular disease at age 2 years, presented for short stature at age 11 years, and did not begin to fracture until age 16 years. Radiographs showed mild platyspondyly and focal metaphyseal and femoral osteosclerosis. She was homozygous for a unique splice site mutation in TNFRSF11A (c.616+3A>G). Patient 4 at age 2 years manifested developmental delay and frequent infections but did not fracture. He had unique metadiaphyseal splaying and osteosclerosis, vertebral end-plate osteosclerosis, and cortical thinning of long bones but no mutation was detected of SLC29A3, TNFRSF11A, TCIRG1, LRRK1, or CSF1R associated with DSS. We find that DSS from defective SLC29A3 presents earliest and with fractures. DSS from compromised TNFRSF11A can lead to optic atrophy as an early finding. Negative mutation analysis in patient 4 suggests further genetic heterogeneity underlying the skeletal phenotype of DSS. (c) 2022 The Authors. JBMR Plus published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research.Publication Metadata only Clinical spectrum of cubulin mutations(2022-11-01) ALPAY, HARİKA; DEMİRCİ BODUR, ECE; ALAVANDA, CEREN; YILDIZ, NURDAN; ATA, PINAR; GÖKCE, İBRAHİM; Cicek N., ALPAY H., Guven S., Turkkan O. N. , Polat S., DEMİRCİ BODUR E., ALAVANDA C., YILDIZ N., ATA P., GÖKCE İ.Publication Metadata only Molecular analysis of MKRN3 gene in Turkish girls with sporadic and familial idiopathic central(2023-03-01) KIRKGÖZ, TARIK; KAYGUSUZ, SARE BETÜL; ALAVANDA, CEREN; GÜRPINAR TOSUN, BUŞRA; ELTAN, MEHMET; SEVEN MENEVŞE, TUBA; GÜRAN, TÜLAY; ARMAN, AHMET; DEMİRCİOĞLU, SERAP; BEREKET, ABDULLAH; KIRKGÖZ T., KAYGUSUZ S. B., ALAVANDA C., Helvacioglu D., Abali Z. Y., GÜRPINAR TOSUN B., ELTAN M., SEVEN MENEVŞE T., GÜRAN T., ARMAN A., et al.Objectives: Central precocious puberty (CPP) develops as a result of early stimulation of the hypothalamic-pituitary-gonadal (HPG) axis. The loss-of-function mutations in the Makorin-ring-finger3 (MKRN3) gene appear to be the most common molecular cause of familial CPP. We aimed to identify MKRN3 gene mutations in our CPP cohort and to investigate the frequency of MKRN3 mutations.Methods: 102 patients with CPP included. 53 of them had family history of CPP in the first and/or second-degree relatives. MKRN3 gene was analyzed by next-generation sequencing.Results: Possible pathogenic variants were found in 2/53 patients with family history of CPP (3.8%) and 1/49 patient without family history (2%). A novel heterozygous c.1A > G (p.Met1Val) mutation, a novel heterozygous c.683_684delCA (p.Ser228*) and a previously reported c.482dupC (Ala162Glyfs*) frameshift variations were detected. The two novel variants are predicted to be pathogenic in silico analyses.Conclusions: In our cohort, possible pathogenic variants in MKRN3 gene were detected in 2.9% of the total cohort, 3.8% of the familial and 2% of the nonfamilial cases, slightly lower than that reported in the literature. Two novel variants detected contribute to the molecular repertoire of MKRN3 defects in CPP. Classical pattern of paternal inheritance has been demonstrated in all three cases. However, the father of the patient 3 did not have history of CPP suggesting that the father inherited this variant from his mother and had phenotype skipping. Therefore, we emphasize that the absence of history of CPP in the father does not exclude the possibility of a MKRN3 mutation.Publication Open Access Mutation Spectrum of Familial Adenomatous Polyposis Patients in Turkish Population: Identification of 3 Novel APC Mutations(2022-02-01) ALAVANDA, CEREN; KEKLİKKIRAN, ÇAĞLAYAN; ÖZDOĞAN, OSMAN CAVİT; GÜNEY, AHMET İLTER; Ates E. A., ALAVANDA C., Demir S., KEKLİKKIRAN Ç., Attaallah W., ÖZDOĞAN O. C., GÜNEY A. İ.Background: Familial adenomatous polyposis (OMIM #175100) and MUTYH-associated polyposis (OMIM #608456) are rare cancerprone disorders characterized by hundreds of adenomatous polyps in the colon and rectum, which have a high probability of malignant transformation. Attenuated familial adenomatous polyposis is a variant of familial adenomatous polyposis, which is a term used for the condition in which patients have less than 100 colorectal polyps. Germline heterozygous Adenomatous polyposis coli (APC) and biallelic MUTYH (mutY DNA glycosylase) pathogenic variations are responsible for familial adenomatous polyposis and MUTYH-associated polyposis respectively. The aim of this study is to discuss the clinical manifestations of patients having pathogenic APC and MUTYH variations. Methods: We included 27 probands who have more than 10 colonic polyps in this study. After evaluation of their clinical and family histories, the probands were screened for APC and MUTYH variations via next generation sequencing. The family members of the probands carrying pathogenic variations were screened via Sanger sequencing. Results: Among 27 probands, pathogenic APC and MUTYH variations were detected in 3 and 6 probands respectively. In the APC gene, 3 novel truncating variations (p.Leu360*, p.Leu1489Phefs*23, and p.Leu912*) were detected in 3 unrelated probands. In the MUTYH gene, only 2 distinct pathogenic variations were detected (p.Pro295Leu and p.Glu480del) in the homozygous or compound heterozygous state. Conclusion: In this study, molecular etiology was clarified in 9 familial polyposis patients. The p.Pro295Leu and p.Glu480del variations seem to be common in the Turkish population and may be considered as a first-step genetic test in Turkish familial polyposis patients showing autosomal recessive inheritance. However more studies are needed to reveal the exact frequency of these variations.Publication Open Access Two new cases with novel pathogenic variants reflecting the clinical diversity of Schaaf-Yang syndrome(2023-01-01) ALAVANDA, CEREN; GEÇKİNLİ, BİLGEN BİLGE; DEMİRCİOĞLU, SERAP; ARMAN, AHMET; ALAVANDA C., Arslan Ateş E., Yavaş Abalı Z., GEÇKİNLİ B. B., DEMİRCİOĞLU S., ARMAN A.Schaaf-Yang syndrome (SHFYNG) is a rare pleiotropic disorder, characterized by hypotonia, joint contractures, autism spectrum disorders (ASD), and developmental delay/intellectual disability. Although it shares some common features with Prader-Willi Syndrome, joint contractures, and ASD were more commonly detected in in this syndrome. Recently, it was shown that truncating variants in the paternal allele of the MAGEL2 gene cause SHFYNG. Here, we present two patients diagnosed with SHFYNG syndrome having two different novel truncating variants in the MAGEL2 gene, one paternally inherited and one de novo. One patient had obesity, brachydactyly and dysmorphic features, and the other patient presented with contractures, severe hypotonia and early death. This is the first report of Turkish SHFYNG syndrome cases presented to emphasize the phenotypic diversity of the syndrome.Publication Metadata only Etiological analysis of hypophosphatemia: A single-center experience(2022-09-01) ELTAN, MEHMET; ALAVANDA, CEREN; ATA, PINAR; GÜRAN, TÜLAY; DEMİRCİOĞLU, SERAP; BEREKET, ABDULLAH; Eltan M., Alavanda C., Abali Z. Y. , Bayramoglu E., Kaygusuz S. B. , Helvacioglu D., Tosun B. G. , Menevse T. S. , Ata P., Guran T., et al.Publication Metadata only A Second Family with Myhre Syndrome Caused by the Same Recurrent SMAD4 Pathogenic Variation (p.Arg496Cys)(2023-01-01) ALAVANDA, CEREN; Demir S., ALAVANDA C., Yesil G., Aslanger A. D., Ates E. A.Introduction: Myhre syndrome (MS; OMIM #139210) is a rare connective tissue disorder presenting with cardiovascular, respiratory, gastrointestinal, and skeletal system findings. Fewer than 100 patients were reported until recently, and all molecularly confirmed cases had de novo heterozygous gain-of-function mutations in the SMAD4 gene. Dysregulation of the TGF-beta signaling pathway leads to axial and appendicular skeleton, connective tissue, cardiovascular system, and central nervous system abnormalities. Case Presentation: Two siblings, 12 and 9 years old, were referred to us because of intellectual disability, neurodevelopmental delay, and dysmorphic facial features. Physical examination revealed hypertelorism, strabismus, small mouth, prognathism, short neck, stiff skin, and brachydactyly. Discussion: With a clinical diagnosis of MS, the SMAD4 gene was analyzed via Sanger sequencing, and a heterozygous c.1486C>T (p.Arg496Cys) pathogenic variation was detected in both of the siblings. The segregation analysis revealed that the mutation was inherited from the father who displayed a milder phenotype. Among the 90 patients in the literature, one family was reported in which two siblings carried the same variation (p.Arg496Cys), inherited from the severely affected mother. We are reporting the second family which has three affected family members, a father and two children. We report this study to remind the clinicians to be aware of the parental transmission of SMAD4 variations and also evaluate the parents of the Myhre cases.Publication Metadata only Genetıc tests ın non-neurogenıc neurogenıc bladder: two sıblıngs wıth ochoa syndrome(2022-11-01) GÖKCE, İBRAHİM; ALAVANDA, CEREN; ŞEKERCİ, ÇAĞRI AKIN; DEMİRCİ BODUR, ECE; YILDIZ, NURDAN; YÜCEL, SELÇUK; ATA, PINAR; ALPAY, HARİKA; Pul S., GÖKCE İ., ALAVANDA C., ŞEKERCİ Ç. A. , DEMİRCİ BODUR E., Turkkan O. N. , Guven S., Cicek N., YILDIZ N., YÜCEL S., et al.