Person: SÖYLEMEZ, MEHMET ALİ
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SÖYLEMEZ
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MEHMET ALİ
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Publication Metadata only The use of long-range pcr protocol in the diagnosis of friedreich ataxia(2020-11-22) ALAVANDA, CEREN; POLAT, HAMZA; SÖYLEMEZ, MEHMET ALİ; GEÇKİNLİ, BİLGEN BİLGE; ATA, PINAR; ARMAN, AHMET; ALAVANDA C., POLAT H., DEMİR Ş., ARSLAN ATEŞ E., SÖYLEMEZ M. A., GEÇKİNLİ B. B., ATA P., ARMAN A.Introduction: Friedreich ataxia(FRDA) is multisystemic disorder characterized by trinucleotide expansions in FXN gene. It’s one of the most common causes of autosomal recessive ataxia. Material/Method: Fragment analysis method was used to detect GAA triple nucleotide repeat expansions in the first intron of the FXN gene. Long-range PCR was performed with primers selected from both in intron and exon for confirmation in patients with more than two hundred repeats. Results: Fragment analysis was performed in 20 patients with FRDA pre-diagnosis. Long-range PCR was performed in 5 patients with more than 200 GAA repeats. After long-range PCR, the number of repetitions between 180 and 1450 was found in these patients. One allele of two siblings whose fragment analysis gave negative results was found to have an approximately 950 repeats. FXN gene sequence analysis was planned in order not to miss point mutations in patients with negative results. In order to provide appropriate genetic counseling to patients, segregation studies are continuing. Discussion: Although fragment analysis is reliable method in this disease, its reliability decreases when the number of repeats is high. Although Southern-blot method can be used for confirmation, long-range PCR protocols which are cheaper and easier, can also be applied.Publication Metadata only Characterization of brca genes’ variants in turkish hereditary breast and ovarian cancer (hboc) patients(2020-06-09) SÖYLEMEZ, MEHMET ALİ; GEÇKİNLİ, BİLGEN BİLGE; GÜNEY, AHMET İLTER; ARSLAN ATEŞ E., ALAVANDA C., TÜRKYILMAZ A., POLAT H., SÖYLEMEZ M. A., GEÇKİNLİ B. B., GÜNEY A. İ.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 Metadata only Yeni nesil dizileme analizi ıle saptanan gen/psödogen varyantlarının ayrıştırılmasında kullanışlı bir araç: Haplotip analizi(2021-11-28) SÖYLEMEZ, MEHMET ALİ; GEÇKİNLİ, BİLGEN BİLGE; ATA, PINAR; ARSLAN ATEŞ E., ALAVANDA C., POLAT H., Demir Ş., Dirimtekin E., Başer Z. M., Yıldırım Ö., SÖYLEMEZ M. A., GEÇKİNLİ B. B., ATA P., et al.Giriş: Lynch Sendromu, diğer adıyla Herediter Nonpolipozis Kolon Kanseri (HNPCC), kolorektal kanserler başta olmak üzere gastrointestinal sistem kanserleri, endometrium kanseri, meme kanseri gibi kanserlerle karşımıza çıkan kalıtımsal bir kanser yatkınlık sendromudur. Hatalı eşleşme tamir genlerindeki (MMR genleri: MLH1, MSH2, MSH6, PMS2 ve EPCAM) mutasyonlar Lynch Sendromuna neden olmaktadır. Olgu: Tarafımıza endometrium kanseri tanısı ile yönlendirilen 69 yaşında kadın olgu polikliniğimizde değerlendirildi. Olgunun 3 yıl önce kolon kanseri tanısı nedeniyle yapılan rutin takiplerinde endometrial kitle saptanması üzerine yapılan total abdominal histerektomi öyküsü mevcuttu. Pedigri analizinde kanser öyküsü bulunmayan hasta izole vaka olarak değerlendirildi. Patolojik değerlendirmesinde endometrial kanser tanısı alan hastanın tümör dokusunda yüksek mikrosatellit instabilitesi ve PMS2 ekspresyon kaybı saptandı, MLH1 hipermetilasyonu ve BRAF V600E mutasyonu saptanmadı. Periferik kandan DNA izolasyonu (QIAamp DNA Mini Kit, QIAGEN Germantown, MD USA) sonrası MLH1 ve PMS2 genleri Illumina MiSeq platformunda, HNPCC MASTR Plus (Multiplicom, Agilent,CA,USA) kiti kullanılarak yeni nesil dizi analizi yöntemiyle değerlendirildi. MLH1 geninde mutasyon saptanmayan olguda PMS2 geni ekzon 11’de heterozigot 47bç bir duplikasyon saptandı (c.1362_1407dup; p.Pro470Valfs*3). Mutasyon veri tabanlarında tanımlı değildi, çerçeve kaymasına yol açarak erken stop kodonuna sebep olması beklendiğinden patojenik bir varyant olarak değerlendirildi. Ancak pseödogen nedeniyle tahmin ettiğimiz gibi kopya sayı analizinde ekzon 11’in 4 kopya olduğu görünmekteydi. Amplikon değerlendirildiğinde bu bölgede PMS2CL ile PMS2 arasında kısmen düşük bir homoloji olduğu dikkat çekiciydi (%96). Farklı olan nükleotidlerin değerlendirilmesi ile yapılan haplotip analizinde insersiyonun olduğu okumaların tamamıyla PMS2 genine ait olduğu ortaya koyuldu. Sonuç: Psödogenler moleküler tanıyı zorlaştıran bir problem olarak karşımıza çıkmaktadır. Gen ile psödogenleri arasındaki minimal farklılıkları kullanarak saptanan mutasyonun gen veya psödogen üzerinde olduğunu belirlemek ek yöntemler gerektirmektedir. Bu durum tanıda gecikmelere yol açması ve ek olanaklar gerektirmesi bakımından klinik pratikte zorluklara yol açmaktadır. Bu çalışmada yeni nesil dizileme yönteminin tek bir DNA ipliğine ait diziyi ortaya koyma avantajı kullanılarak amplikondaki tek nükleotid varyasyonları (SNVs) analiz edilmiş ve amplikonun kopyalandığı DNA molekülünün tamamıyla PMS2 genine ait olduğu gösterilmiştir. Varyasyonun psödogene ait olduğundan şüphelenildiğinde amplikonun bilgi verici SNV’ler açısından değerlendirilmesi ek tetkik gereksinimini ortadan kaldırarak zaman kazandıracak ve gereksiz harcamaları da azaltacaktır.Publication Metadata only A recurrent HPS1 gene mutation in a Hermansky-Pudlak patient with uncommon clinical presentation(2020-02-22) SÖYLEMEZ, MEHMET ALİ; GEÇKİNLİ, BİLGEN BİLGE; GÜNEY, AHMET İLTER; ATA, PINAR; ARMAN, AHMET; ALAVANDA C., ARSLAN ATEŞ E., POLAT H., İlker A., Yıldırım Ö., SÖYLEMEZ M. A., GEÇKİNLİ B. B., GÜNEY A. İ., ATA P., ARMAN A.Publication Metadata only ZBTB24 novel mutation identified in Turkish ICF syndrome patient(2020-02-22) SÖYLEMEZ, MEHMET ALİ; GEÇKİNLİ, BİLGEN BİLGE; GÜNEY, AHMET İLTER; ATA, PINAR; ARMAN, AHMET; İlker A., POLAT H., ALAVANDA C., Yıldırım Ö., ARSLAN ATEŞ E., SÖYLEMEZ M. A., GEÇKİNLİ B. B., GÜNEY A. İ., ATA P., ARMAN A.Publication Metadata only Two new cases diagnosed with Hermansky-Pudlak Syndrome(2021-08-28) GEÇKİNLİ, BİLGEN BİLGE; SÖYLEMEZ, MEHMET ALİ; ATA, PINAR; ARMAN, AHMET; ALAVANDA C., ARSLAN ATEŞ E., GEÇKİNLİ B. B., Demir Ş., POLAT H., UĞUZDOĞAN F., SÖYLEMEZ M. A., ATA P., ARMAN A.Publication Metadata only Schimke immuno-osseous dysplasia patient with early renal dysfunction harboring a novel homozygous mutation in the SMARCAL1 gene(2021-09-18) SÖYLEMEZ, MEHMET ALİ; GEÇKİNLİ, BİLGEN BİLGE; GÜNEY, AHMET İLTER; ATA, PINAR; ARMAN, AHMET; ALAVANDA C., Demir Ş., UĞUZDOĞAN F., POLAT H., ARSLAN ATEŞ E., SÖYLEMEZ M. A., GEÇKİNLİ B. B., GÜNEY A. İ., ATA P., ARMAN A.Main findings of this syndrome are steroid resistant nephrotic syndrome (SRNS), immunodeficiency and spondyloepiphyseal dysplasia (SED). Biallelic mutations in SMARCAL1 gene cause SIOD. SMARCAL1 encodes a conserved ATP-dependent chromatin remodeling protein which is a member of Sucrose Non-Fermenting 2(SNF2) family. Case: One-year-old female referred to our clinic because of having growth retardation and developmental delay. Her parents were from the same small village. She was delivered prematurely due of preeclampsia. In neonatal intensive care unit cardiac and renal anomalies were detected. Eruption of deciduous teeth were delayed. Fine hair, microcephaly, prominent forehead, malar hypoplasia, depressed nasal bridge, bulbous nasal tip, long philtrum, thin upper lip, everted lower lip, microdontia, anteverted ears, short neck and trunk, hyperpigmented macules on trunk, protruding abdomen, tapering fingers, brachydactyly were detected. She was diagnosed with SRNS. Skeletal survey showed platyspondyly, scoliosis, shallow acetabular fossae. No pathology was observed in the epiphyses. After DNA isolation from the peripheral blood, clinical exome sequencing were performed via next-generation-sequencing. Novel homozygous c.2423_2427+9delCCAGGGGTAAGAGA mutation in the SMARCAL1 gene(NM_001127207) was detected. According to ACMG criterias it was pathogenic(PVS1,PM2, PP3). Her parents were heterozygous. Discussion/ Conclusion: SIOD is characterized with short stature,SED,immune deficiency,SRNS and dysmorphic findings. SIOD had classified into severe and mild types. In severe patients, infections, cerebrovascular disease and renal phenotype present at an earlier age. Our patient had a severe phenotype as she carried a truncating mutation. This study reveals a novel mutation and contributes to the genotype-phenotype correlation for SIOD.Publication Metadata only Spink5 gen mutasyonu saptanan netherton sendrom'lu olgu(2020-01-11) SÖYLEMEZ, MEHMET ALİ; GEÇKİNLİ, BİLGEN BİLGE; GÜNEY, AHMET İLTER; ATA, PINAR; ARSLAN ATEŞ E., ALAVANDA C., ERTÜRK B., SİNGER R., Yıldırım Ö., POLAT H., SÖYLEMEZ M. A., GEÇKİNLİ B. B., GÜNEY A. İ., ATA P., et al.Publication Open Access First patient diagnosed as feingold syndrome type 2 with alport syndrome and review of the current literature(2022-12-01) ARMAN, AHMET; ATA, PINAR; SÖYLEMEZ, MEHMET ALİ; Demir S., SÖYLEMEZ M. A., ARMAN A., ATA P.Introduction: Feingold syndrome type 2 (FGLDS2) is an ultra-rare genetic disorder characterized by short stature, microcephaly, digital abnormalities, and intellectual disability. Until now, 22 patients have been reported in the literature. FGLDS2 is caused by a germline heterozygous deletion of 13q resulting in haploinsufficiency of the MIR17HG gene. Case report: In the present study, we evaluated clinical, radiological, and genetic analyses of a 10-year-old Turkish-origin girl with short stature, brachydactyly, intellectual disability, hematuria, and proteinuria. Conclusion/Discussion: In the array-CGH analysis, a 15.7-Mb deletion, arr[hg19] 13q22q31.3(78,241,132_93,967,288)x1, was detected, and this alteration was evaluated to be pathogenic. The deletion of this region covering the MIR17HG gene is a potential cause of FGLDS2. Also, at her clinical exome sequencing study, a heterozygous c.2023G>A p.(Gly675Ser) variation was detected in the COL4A5 gene (NM_000495.4) that was likely pathogenic in up-to-date databases. As a result, we report on a patient who has FGLDS2 and Alport syndrome. This is the first report of a Turkish-origin FGLDS2 patient. Reporting new cases expands the range of phenotypes, plays a crucial role in understanding the FGLDS2 pathogenesis, and is important in terms of screening at-risk family members for giving appropriate genetic counseling and preimplantation genetic diagnosis opportunities.