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Yıl:2011; Cilt: 1; Sayı: 3>> Özet
Güncel Psikiyatri ve Psikonörofarmakoloji; 2011;1(3):37-45
Bazı Psikiyatrik Hastalıkların Genetiği
MA Ergün
Gazi Üniversitesi Tıp Fakültesi, Ankara
Günümüzde pskiyatrik hastalıkların gelişmesinde gen-gen ve gen-çevre ilişkileri ile epigenetik düzeneklerin
etkili olduğu düşünülmektedir. Pskiyatrik hastalıklardaki kalıtsallık oranları araştırıldığında; şizofrenide % 60-
90, depresyonda %31-42, dikkat eksikliği/hiperaktivite bozukluğunda %60-80, otizmde %90 ve bipolar
bozuklukta ise %60-85 arasında olduğu bildirilmiştir. Pskiyatrik hastalıkların gelişiminde kromozomal hastalıklar,
genetik sendromların rolü vardır. Ayrıca mitokondriyal DNA disfonksiyonu ile şizofreni, depresyon ve
bipolar hastalık gibi psikiyatrik hastalıklar arasında ilişki bildirilmiştir. Yapılan bağlantı analizleri ve assosiasyon
çalışmaları sonucu pskiyatrik hastalıklarla ilgili bazı kromozomal bölgeler ve aday genler bildirilmektedir. Ancak,
bulunan aday genler diğer çalışmalarda doğrulanamamaktadır. Buna neden olarak; yaş, cinsiyet, etnik
köken, komorbidite, düşük örnek sayısı sayılabilir. Bu nedenle, pskiyatrik hastalıklarda gen-çevre etkisinin iyi
anlaşılması bu hastalıklara yaklaşım, önlenmeleri ve spesifik tedavilerin geliştirilmesine imkan sağlayacaktır.
Genetics of Some Psychiatric Disorders
Today, gene-gene and gene-environment interactions with epigenetic mechanisms are thought to be important in the development of psychiatric
disorders. The heritability estimates in psychiatric disorders have been reported as follows; 60-90% in schizophrenia, 31-42% in depression,
60-80% in attention deficit/hyperactivity disorders, 90% in autism and 60-85% in bipolar disorders. Chromosomal disorders and genetic
syndromes have also roles in psychiatric disorders. In addition, mitochondrial DNA dysfunction has been reported in schizophrenia, depression
and bipolar disorders. Linkage analysis and association studies indicate some chromosomal regions and candidate genes in psychiatric
disorders. However, these results can not be confirmed in the other studies. The reasons for this condition may be based on the age, gender,
ethnicity, co-morbidity, and low study sample sizes. Therefore, understanding the effect of gene-environment interactions in psychiatric disorders
will enable us to better approach, prevention, and development of specific therapies regarding these disorders.

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