Epigenetics and genomics in Turner syndrome

Area of Science:

• Genetics
• Molecular Biology
• Endocrinology

Background:

• Turner syndrome (TS) is characterized by X chromosome monosomy, but its phenotype is not solely determined by gene dosage.
• Complex genetic, transcriptional, and epigenetic factors contribute to TS comorbidities like infertility, cardiac issues, and autoimmune diseases.
• Phenotypic variability in TS, even with identical karyotypes, suggests a non-conventional genotype-phenotype relationship.

Purpose of the Study:

• To review genetic mechanisms driving differential gene expression in TS.
• To identify key genes implicated in TS comorbidities and X chromosome aneuploidy syndromes.
• To explore the genetic basis of phenotypic variability in Turner syndrome.

Main Methods:

• Literature review of genetic mechanisms in Turner syndrome.
• Analysis of gene expression and methylation patterns.
• Identification of candidate genes associated with TS comorbidities.

Main Results:

• Differential gene expression and methylation of KDM6A are observed in TS and Klinefelter syndrome, impacting germ cell development.
• TIMP1/TIMP3 genes are linked to the incidence of bicuspid aortic valve in TS.
• KDM5C may influence neurocognitive development in TS and Klinefelter syndrome.

Conclusions:

• The phenotype of Turner syndrome is influenced by complex genetic interactions and epigenetic modifications.
• Specific genes (KDM6A, TIMP1/3, KDM5C) are potential contributors to TS comorbidities.
• Further research is essential to fully understand the genetic mechanisms underlying TS phenotypic variability.