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This study was designed to determine the intrafamilial effect of SHOX haploinsufficiency on stature, by comparing the growth and phenotype of 26 SHOX haploinsufficient individuals with 45 relatives and population standards. It confirmed that SHOX haploinsufficiency leads to growth restriction from birth to final height. Compared to unaffected siblings, the SHOX haploinsufficient cohort was 2.14 SDS (3.8 cm) shorter at birth and 2.1 SDS shorter through childhood. At final height females were 2.4 SDS (14.4 cm) shorter and males 0.8 SDS (5.3 cm) shorter than normal siblings. The family height analysis suggests that the effect of SHOX haploinsufficiency on growth may have been previously underestimated at birth and overestimated in males at final height. SHOX haploinsufficiency leads to short arms in 92%, bilateral Madelung deformity in 73% and short stature in 54%. Females were more severely affected than males. We conclude that SHOX is a major growth gene and that mutations are associated with a broad range of phenotype.

Familial Growth and Skeletal Features Associated with SHOX Haploinsufficiency