[Current genetic issues and phenotypic variants in Kallmann syndrome]
Bianca Ethel Gutiérrez-Amavizca1, Luis E Figuera, Ricardo Orozco-Castellanos
1Doctorado en Genética Humana, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara. División de Genética, Centro de Investigación Biomédica de Occidente, Instituto Mexicano del Seguro Social, Guadalajara, Jalisco, México. ethel90210@gmail.com
Kallmann syndrome involves hypogonadotropic hypogonadism and anosmia due to GnRH neuron migration defects. Understanding its diverse clinical and molecular features, including associated abnormalities, is crucial.
Area of Science:
- Endocrinology
- Neuroscience
- Genetics
Context:
- Kallmann syndrome is a rare genetic disorder.
- Characterized by hypogonadotropic hypogonadism and impaired sense of smell (anosmia/hyposmia).
- Caused by defective migration of gonadotropin-releasing hormone (GnRH) synthesizing neurons and olfactory bulb development.
Purpose:
- To provide an updated review of Kallmann syndrome.
- Focus on the clinical and molecular basis of the condition.
- Highlight the importance of recognizing phenotypic variants.
Summary:
- Kallmann syndrome presents with hypogonadotropic hypogonadism resulting from GnRH deficiency and anosmia/hyposmia due to olfactory system abnormalities.
- Associated features can include renal agenesis, cleft palate, dental agenesis, synkinesis, short metacarpals, hearing loss, and seizures.
- Genetic defects in GnRH neuron migration underlie the primary features, with diverse phenotypes observed.
Impact:
- Enhances understanding of Kallmann syndrome's complex etiology.
- Informs diagnosis and management by detailing phenotypic variability.
- Underscores the link between neurodevelopmental pathways and reproductive function.
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