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HLXB9 homeobox gene and caudal regression syndrome
Elisa Merello1, Patrizia De Marco, Samantha Mascelli
1U.O. Neurochirurgia, Istituto G. Gaslini, Genova, Italy.
Insights
The HLXB9 gene is not a cause of Caudal Regression Syndrome (CRS). This study found no link between HLXB9 gene variants and CRS development, confirming its role only in Currarino Syndrome.
Area of Science:
- Developmental biology
- Genetics
- Medical research
Background:
- Caudal Regression Syndrome (CRS) is a complex congenital disorder affecting the spine and limbs.
- Currarino Syndrome (CS) is a specific subtype of CRS characterized by sacral anomalies, anorectal malformations (ARMs), and presacral masses.
- The HLXB9 gene was previously implicated as a major cause of CS.
Purpose of the Study:
- To investigate the role of the HLXB9 gene in a larger cohort of Caudal Regression Syndrome cases.
- To determine if HLXB9 gene variants contribute to the risk of developing CRS.
- To reevaluate the association between HLXB9 and CRS beyond Currarino Syndrome.
Main Methods:
- Analyzed 48 Caudal Regression Syndrome cases using Single-Strand Conformation Polymorphism (SSCP) analysis.
- Employed a case-control approach to assess the impact of GCC triplet length variations in the HLXB9 gene.
- Stratified allelic frequencies based on the presence of ARMs and sacral agenesis type.
Main Results:
- No pathological variants or mutations in the HLXB9 gene were detected in the CRS cases studied.
- The length of GCC triplets in exon 1 of the HLXB9 gene did not correlate with an increased risk of CRS.
- Stratification analysis further supported the lack of association between HLXB9 and CRS risk factors.
Conclusions:
- The HLXB9 gene is not implicated in the pathogenesis of Caudal Regression Syndrome.
- The HLXB9 gene is confirmed as a causative gene exclusively for Currarino Syndrome.
- This study clarifies the genetic basis of CRS, excluding HLXB9 as a contributing factor.
Background:
Caudal regression syndrome (CRS) is a congenital heterogeneous constellation of caudal anomalies that include varying degrees of agenesis of the spinal column, anorectal malformations (ARMs), genitourinary anomalies, and pulmonary hypoplasia. The combination of a particular form of hemisacrum, ARM, and presacral mass (teratoma, anterior meningocele, rectal duplication, or a combination thereof) constitutes Currarino syndrome (CS). Previous reports have shown HLXB9 to be a major causative gene for CS. The aim of our study was to reevaluate the involvement of the HLXB9 gene in a larger group of CRS cases.
Methods:
SSCP analysis was performed on a series of 48 CRS cases without CS. A case-control approach was used to test whether an alteration of the length of the GCC triplets in exon 1 of the HLXB9 gene could contribute to CRS risk.
Results:
No pathological variants of the HLXB9 gene were identified by mutational analysis. We also found no evidence that the length of the GCC triplets had any effect on the CRS risk, even when the allelic frequencies were stratified according to the presence or absence of ARMs and the type of sacral agenesis.
Conclusions:
We confirmed that the HLXB9 gene is not involved in the pathogenesis of CRS, and to date is known as a causative gene only for CS.
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