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Related Experiment Videos

Genotype and phenotype in hypochondroplasia

U Ramaswami1, G Rumsby, P C Hindmarsh

  • 1London Centre of Paediatric Endocrinology, Great Ormond Street Childrens Hospital, United Kingdom.

The Journal of Pediatrics
|July 22, 1998
PubMed
Summary

Mutations in the fibroblast growth factor receptor gene (FGFR3) are linked to hypochondroplasia (Hch). The C1620A mutation in FGFR3 causes a severe Hch phenotype resembling achondroplasia, while other cases show proportionate short stature with unknown genetic causes.

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Area of Science:

  • Genetics
  • Pediatrics
  • Endocrinology

Background:

  • Mutations in the fibroblast growth factor receptor gene (FGFR3) have been associated with hypochondroplasia (Hch).
  • Understanding the genetic basis of Hch is crucial for diagnosis and management of short stature.

Purpose of the Study:

  • To investigate the prevalence of specific FGFR3 mutations (C1620A and C1620C) in children diagnosed with hypochondroplasia (Hch).
  • To compare growth parameters (height, sitting height, subischial leg length) between children with Hch, achondroplasia, and Hch with identified mutations.

Main Methods:

  • Screening of 65 children with Hch for C1620A and C1620C mutations in FGFR3.
  • Analysis of height, sitting height, and subischial leg length SD scores in three groups: achondroplasia, Hch with C1620A mutation, and Hch without identified mutation.

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  • Statistical analysis using ANOVA with the Student Neuman-Keuls test.

    • Main Results:

    • 28 out of 65 (43%) Hch patients were heterozygous for the C1620A mutation in FGFR3, leading to a lysine to asparagine substitution.
    • Children with achondroplasia and Hch with the C1620A mutation exhibited significantly compromised height and disproportionate short stature, particularly in leg length.
    • A subgroup of Hch patients presented with proportionate short stature, radiologic similarities, and pubertal growth failure, but without identified mutations.

    Conclusions:

    • The common C1620A mutation in FGFR3 is associated with a severe Hch phenotype mimicking achondroplasia in early childhood.
    • A significant number of Hch patients with proportionate short stature and pubertal growth issues have an unknown genetic basis.
    • Further research is needed to identify the genetic underpinnings of the milder, proportionate short stature phenotype in Hch.