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Yıl:2009; Cilt: 11; Sayı: 2>> Özet
Türkiye'de Psikiyatri; 2009;11(2):80-84
Dikkat Eksikliği Hiperaktivite Bozukluğu ve Genetik
BY Konuk, YI Taner, V Baltacı
Ufuk Üniversitesi Tıp Fakültesi Tıbbi Genetik Anabilim Dalı
Dikkat eksikliği, hiperaktivite bozukluğu (DEHB); dikkat eksikliği, hiperaktivite ve dürtüsellik ile karakterize, sık
görülen bir nöropsikiyatrik hastalıktır. Bozukluğun etiyopatogenezi psikiyatri ve genetik alanları için yoğun
bir çalışma alanı oluşturmaktadır. Aile, ikiz ve evlatlık çalışmaları, %60 ile 90 arasında değişen kalıtılabilirlik
değeri ile DEHB'nin etiyolojisinde genetik faktörlerin önemli katkısı olduğunu göstermiştir. DEHB etiyolojisinde
yer alan hastalığa özgün genlerin bulunmasını amaçlayan moleküler genetik çalışmalar hızla devam
etmektedir. Günümüze kadar gerçekleştirilen sınırlı sayıda genom boyu bağlantı analizi araştırmalarının sonuçları
yeterli olmamıştır, DEHB'ye özgün genlerin ortaya çıkarılması için daha ayrıntılı haritalama çalışmalarına
ihtiyaç duyulmaktadır. DEHB'ye yönelik gerçekleştirilen pekçok aday gen çalışmasının sonuçları dopaminerjik,
serotoninerjik ve noradrenerjik yolakların bu kompleks hastalığın etiyolojisinde rol aldığını düşündürmektedir.
Bu makalede DEHB'nin genetik temeline ilişkin son yıllarda yapılmış çalışmaların gözden geçirilmesi
amaçlanmıştır.
Attention Deficit Hyperactivity Disorder and Genetics
Attention-deficit hyperactivity disorder (ADHD) is a common neuropsychiatric disorder which is characterized by inattention, hyperactivity,
and impulsivity. The etiopathogenesis of the disorder is an area of intense research. Family, twin, and adoption studies of ADHD suggest that
genetic factors contribute substantially to its etiology, with heritability estimates ranging from 60 to 90%. Molecular genetic studies with the intention
of identifying specific genes involved in the etiology of ADHD are continuing at a rapid rate.The few genome-wide linkage analysis
studies initiated thus far are not conclusive and we await further details and specific genes from fine-mapping studies. Many candidate gene
studies of ADHD have converged to suggest that dopaminergic, serotoninergic, and noradrenergic neurotransmission pathways account for
the etiology of this complex disease.The intent of this article is to provide an overview of the latest findings on the genetic basis of ADHD.

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