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Megalocornea-mental retardation syndrome: an additional case
G Antiñolo1, M Rufo, S Borrego
1Unidad de Genética Médica, Hospital Universitario, Virgen del Rocío, Sevilla, Spain.
Abstract:
In 1975, Neuhaüser (Z Kinderheilk 120:1-8) reported on a recessively inherited entity comprising mental retardation, megalocornea, and seizures. The megalocornea-mental retardation (MMR) syndrome (MIM 249310) is a rare entity. There have been 19 previously published cases and the clinical differences observed between reported patients have raised questions regarding the nosology of the syndrome and the issue of heterogeneity versus variability. We report on a new case: a 2 6/12-year-old boy, first child of nonconsanguineous healthy parents with megalocornea (corneal diameter > or = 13 mm), delayed psychomotor development and hypotonia, plus minor facial anomalies.
Insights
Megalocornea-mental retardation (MMR) syndrome is a rare genetic disorder. This report details a new case, contributing to the understanding of its variability and nosology.
Area of Science:
- Genetics
- Ophthalmology
- Neurology
Background:
- Megalocornea-mental retardation (MMR) syndrome, a recessively inherited disorder, is characterized by intellectual disability, seizures, and megalocornea.
- First described in 1975, the syndrome's nosology remains debated due to observed clinical heterogeneity among the 19 previously reported cases.
Observation:
- A new case of MMR syndrome is presented in a 2-year-old boy.
- The patient exhibits key features including megalocornea (corneal diameter ≥13 mm), delayed psychomotor development, hypotonia, and minor facial anomalies.
- The parents are nonconsanguineous and healthy, consistent with recessive inheritance patterns.
Findings:
- This case adds to the spectrum of clinical presentations within MMR syndrome.
- The findings support the ongoing discussion regarding genetic heterogeneity versus phenotypic variability in this rare condition.
Implications:
- Further research into the genetic basis of MMR syndrome is warranted to clarify its nosology.
- Understanding the variability in MMR syndrome presentation is crucial for accurate diagnosis and genetic counseling.