Caused by mutation in the collagen I, alpha-2 polypeptide gene (COL1A2, 120160.0005) [MOLECULAR BASIS] Some mutations have been found in homozygosity and the phenotype is more severe than that of the heterozygous parents [MISCELLANEOUS] Caused by mutation in the collagen I, alpha-1 polypeptide gene (COL1A1, 120150.0005) [MOLECULAR BASIS]
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