Genetic Overlap between Holoprosencephaly and Kallmann Syndrome.
K Vaaralahti1, T Raivio, R Koivu
1Institute of Biomedicine/Physiology, University of Helsinki, Finland.
Genetic overlap exists between Kallmann syndrome (KS) and holoprosencephaly (HPE). This study identified novel SIX3 and GLI2 gene variants in KS patients, suggesting shared genetic underpinnings for these midline defect disorders.
Area of Science:
- Genetics
- Developmental Biology
- Endocrinology
Background:
- Kallmann syndrome (KS), septo-optic dysplasia (SOD), and holoprosencephaly (HPE) are associated with midline developmental defects.
- Investigating genetic links between these conditions can elucidate shared etiological pathways.
Purpose of the Study:
- To explore the genetic overlap between Kallmann syndrome and holoprosencephaly.
- To screen patients with KS lacking known KS gene mutations for mutations in genes associated with HPE and other midline defects.
Main Methods:
- Genetic screening of 19 KS patients (negative for known KS gene mutations) for mutations in SOX2, SHH, SIX3, TGIF1, TDGF1, FOXH1, GLI2, and GLI3.
- Analysis of identified variants against a control cohort of 200 subjects.
Main Results:
- One male patient with KS harbored two heterozygous missense variants: one in SIX3 (c.428G>A, p.G143D) and another in GLI2 (c.2509G>A, p.E837K).
- Both SIX3 and GLI2 are implicated in holoprosencephaly etiology.
- No identified variants were found in the control group, suggesting potential pathogenicity.
Conclusions:
- Kallmann syndrome and holoprosencephaly may share genetic etiologies.
- The presence of SIX3 and GLI2 variants in a KS patient highlights the importance of investigating genes involved in midline development for KS.
- Further research is warranted to confirm the role of these genes in KS and related midline defects.
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