Genetic and Epigenetic Alterations in Gestational Diabetes

Yıl 2018, Cilt: 2 Sayı: 1, 9 - 15, 01.04.2018

Sevim Karakaş Çelik , Ayşe Sebla Yamak

Öz

Gestational Diabetes is glucose intolerance that are diagnosed or started for the first time in pregnancy. In pregnancies diagnosed with

gestational diabetes mellitus, complication rates increase in mother and newborn. Many risk factors have been identified for GDM.

These include anemia, advanced maternal age, high parity, GDM in previous gestation, or premature birth of macrosomic baby, short

stature, obesity, multiple gestation, high blood pressure during pregnancy and family history of diabetes. The prevalence of GDM varies

between different populations, with prevalence ranging from 7% to 17% in different populations. There is important role of genetic and

epigenetic differences in variability of GDM prevalence between populations.

Most of the genetic studies on GDM focus on biologically plausible candidate gene analyzes. Two different meta-analyzes involving a

majority of these studies were performed, and these meta-analyzes revealed 8 genes associated with GDM. These genes are; TCF7L2,

GCK, KCNJ11, KCNQ1, CDKAL1, IGF2BP2, MTNR1B and IRS1. All of these locations are also related to the T2DM risk. The majority

of these genes, including GCK, KCNJ11, KCNQ1, MTNR1B, IGF2BP2, CDKAL1 and TCF7L2, encode proteins that are important for

beta cell function or development. There is also evidence that epigenetic factors play an important role in the pathogenesis of GDM. In

this article, genetic and epigenetic factors thought to play a role in the pathogenesis of GDM are presented.

Anahtar Kelimeler

Gestational diabetes, Genetics, Epigenetics

Gestasyonel Diyabette Genetik ve Epigenetik Değişimler

Öz

Gestasyonel Diyabet (GDM) ilk defa gebelikte teşhis edilen veya başlayan farklı derecelerdeki glukoz intöleransıdır. GDM tanısı alan
gebelerde ve yeni doğanda komplikasyon oranı artar. GDM için birçok risk faktörü tespit edilmiş olup bunlar ileri anne yaşı, yüksek
parite, önceki gebelikte GDM öyküsü, ya da makrozomik bebeğin erken doğumu, kısa boy, obezite, çoklu gebelik, gebelik sırasında
yüksek kan basıncı ve ailede diyabet öyküsüdür. GDM prevelansı farklı populasyonlar arasında değişkenlik göstermekte olup bu değer
% 7 ile % 17 arasında değişir. GDM sıklığının populasyonlar arasında değişkenlik göstermesinde, genetik ve epigenetik farklılıkların
önemli rolü olduğu düşünülmektedir.
GDM ile ilgili yapılan genetik çalışmaların çoğu biyolojik olarak makul olan aday gen analizlerine dayanmaktadır. Bu çalışmaların
birçoğunu içeren iki farklı meta-analiz gerçekleştirilmiş olup bu iki meta-analiz sonucunda GDM ile ilişki gösteren 8 gen tespit edilmiştir.
Bu genler; TCF7L2, GCK, KCNJ11, KCNQ1, CDKAL1, IGF2BP2, MTNR1B ve IRS1’dir. Bu lokusların/genlerin tümü aynı zamanda
Tip 2 Diyabet (T2DM) riski ile de ilişkilidir. GCK, KCNJ11, KCNQ1, MTNR1B, IGF2BP2, CDKAL1 ve TCF7L2’nin de dahil olduğu
bu genlerin çoğunluğu, beta hücre fonksiyonu veya gelişimi için önemli olan proteinleri kodlamaktadır. Bunun yanı sıra epigenetik
faktörlerin de GDM patogenezinde oldukça önemli rol oynadığını gösteren kanıtlar mevcuttur. Bu makalede GDM patogenezinde rolü
olduğu düşünülen genetik ve epigenetik faktörler sunulmuştur.

Anahtar Kelimeler

Gestasyonel diyabet, Genetik, Epigenetik

Kaynakça

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