.webp&w=384&q=75){kind=logo}
Loading, please wait...
Loading, please wait...
Recent research highlights a significant breakthrough regarding the PBX1 variant 46,XY DSD connection. The pre-B cell leukemia transcription factor (PBX1) is vital during human embryonic development. Mutations in this gene often lead to complex clinical presentations. In this specific case, researchers identified a novel missense variant, c.710G>C (p.R237T), in a Taiwanese girl with 46,XY Differences of Sex Development (DSD). Consequently, this finding provides new insights into the genetic landscape of gonadal dysgenesis and sexual development.
The study utilized functional validation to assess the impact of the p.R237T variant. Compared to wild-type PBX1, the mutated protein exhibited significantly reduced stability. Furthermore, the variant hampered nuclear translocation within HEK293 cells. This disruption is critical because PBX1 must enter the nucleus to regulate gene expression properly. Additionally, RNA sequencing revealed alterations in several DSD-related genes, such as MAP3K4 and EMX2. Therefore, these molecular changes likely contribute to the undervirilized genitalia and mixed gonadal differentiation observed in the patient.
Identifying the PBX1 variant 46,XY DSD helps clinicians better understand the molecular mechanisms of sexual development. Although the role of PBX1 in the gonads was previously elusive, this case underscores its importance in differentiation. Consequently, genetic testing for PBX1 variants should be considered in syndromic DSD cases. Furthermore, early diagnosis through whole-exome sequencing allows for more personalized clinical management. This advancement ultimately improves our ability to counsel families regarding genetic risks and developmental outcomes in pediatric endocrinology.
The p.R237T variant reduces protein stability and prevents the PBX1 protein from moving into the cell nucleus. This prevents it from correctly regulating genes necessary for normal sexual development.
The patient presented with 46,XY DSD, characterized by severely undervirilized genitalia and gonadal dysgenesis featuring both ovarian and testicular differentiation.
PBX1 acts as a transcription factor expressed throughout embryonic stages. It plays a crucial role in organogenesis, and its variants are increasingly linked to diverse developmental conditions, including DSD.
Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or a professional recommendation. Refer to the latest local and national guidelines for clinical practice.
References
Tsai MC et al. Functional validation of a novel PBX1 missense variant in a 46,XY girl. Sex Dev. 2026 Feb 26. doi: 10.1159/000550575. PMID: 41746858.
Ferraz-de-Souza B, et al. Transcription factors and the genetic control of sexual differentiation. Mol Cell Endocrinol. 2011.
Kopp MC, et al. PBX1 in human development and disease. Journal of Medical Genetics. 2021.
"
Read summarized clinical updates, watch expert medical content, and earn CME certifications right from your smartphone.
Open your smartphone camera to scan and install.
A novel PBX1 variant (p.R237T) is linked to 46,XY DSD, causing reduced protein stability and impaired nuclear translocation in gonadal differentiation....
5 months ago
Andhra Pradesh reported 10 new Covid-19 cases, taking the state tally to 49 while deaths remain at four. With 24 patients hospitalized and 16 under home isolation, the Health Department has intensified monitoring. Medical professionals should review regional distribution, diagnostic protocols, and management plans.
Today
An 11-year Swedish registry study of 618 uterine sarcoma patients found that minimally invasive surgery yielded survival comparable to open surgery in early stages. However, adjuvant chemotherapy conferred no survival benefit in localized or advanced disease, highlighting stage and histology as key outcomes.
3 days back
A cross-sectional study evaluates post-intensive care syndrome in cardiac patients 2-4 weeks post-ICU discharge, highlighting cognitive, psychological, and functional impairments and the need for structured multidisciplinary rehabilitation.
3 days back
Anterior cruciate ligament reconstruction failure lacks uniform definition. A narrative review proposes an integrative framework incorporating objective and subjective instability, persistent pain, restricted motion, graft rupture, and secondary meniscal injury to standardize clinical reporting.
3 days back
With World Obesity Atlas data warning that over 41 million Indian children are overweight or obese, ICMR and NIN have unveiled a 10-point policy roadmap. The initiative calls for mandatory front-of-pack labeling, HFSS taxes, strict marketing bans, and healthier school environments to curb non-communicable diseases.
Today
