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Clinical Challenges in Diagnosing Primordial Dwarfism: Insights from a MOPD II Case Study
Alexandru Daniel Jurca1, Codruța Diana Petchesi1,2, Sânziana Jurca3
1Department of Preclinical Disciplines, Faculty of Medicine and Pharmacy, University of Oradea, 410081 Oradea, Romania.
Insights
Primordial dwarfism (PD) is a rare genetic condition causing severe growth restriction. A case study identified a PCNT gene variant in Microcephalic Osteodysplastic Primordial Dwarfism type II (MOPD II), aiding diagnosis.
Area of Science:
- Genetics
- Pediatrics
- Rare Diseases
Background:
- Primordial dwarfism (PD) encompasses rare genetic disorders characterized by severe intrauterine and postnatal growth restriction.
- PD results in proportionate dwarfism, affecting all body parts equally, with conditions like Seckel syndrome and MOPD types I/III, II.
- Microcephalic PD, including MOPD type II, is defined by small head circumference and presents diagnostic challenges due to variability.
Observation:
- A 10-year-old patient presented with clinical features consistent with Microcephalic Osteodysplastic Primordial Dwarfism type II (MOPD II).
- MOPD II is the most common and well-documented form of microcephalic primordial dwarfism.
- Accurate diagnosis of PD requires careful evaluation to differentiate from other genetic dwarfism disorders.
Findings:
- Genetic analysis of the patient revealed a pathogenic variant in the PCNT (pericentrin) gene: c.1550dup, p.Gln518Alafs*7.
- A deletion of exons 37-41 in the PCNT gene was also identified in conjunction with the pathogenic variant.
- These genetic findings confirm the diagnosis of MOPD II, highlighting the role of PCNT in this condition.
Implications:
- This case underscores the genetic heterogeneity and clinical complexity of primordial dwarfism.
- Accurate genetic diagnosis, particularly of PCNT variants in MOPD II, is crucial for effective patient management.
- Further research into PD genetics can improve diagnostic strategies and therapeutic approaches for affected individuals.
Abstract:
Background and Objectives.Primordial dwarfism (PD) is a rare group of genetic conditions where individuals experience severe growth restriction, both in the womb and after birth. From as early as the fetal stage, those affected are significantly smaller than their peers. What makes PD distinct is its slow but steady growth pattern, resulting in proportionate dwarfism, where all parts of the body are equally shortened. Diagnosing and managing PD presents significant challenges due to its rarity and the wide range of clinical and genetic variability. The main conditions in this group include Seckel syndrome, Microcephalic Osteodysplastic Primordial Dwarfism (MOPD) types I/III, MOPD type II, Meier-Gorlin syndrome, and Silver-Russell syndrome (SRS). The first four-Seckel syndrome, MOPD types I/III, MOPD type II, and Meier-Gorlin syndrome-are associated with microcephaly, and together they are known as microcephalic PD. Given how uncommon PD is, establishing its exact incidence is difficult. It is estimated that about 4 million infants die within the first month of life, with 99% of these deaths occurring in the neonatal period. Materials and Methods. Accurately diagnosing PD requires meticulous evaluation, as it can be easily confused with other genetic disorders that also cause dwarfism. In this article, we present the case of a 10-year-old patient diagnosed with MOPD II, the most common and well-documented form of microcephalic PD. Results. Genetic analysis revealed a pathogenic variant in the PCNT (pericentrin) gene ((c.1550dup, p.Gln518Alafs*7), alongside a deletion of exons 37-41. Conclusions. This case sheds light on the clinical and genetic complexities of primordial dwarfism, underscoring the importance of timely and accurate diagnosis for effective patient care.
