Novel ANKH mutation in a patient with sporadic craniometaphyseal dysplasia.
Craniometaphyseal dysplasia is caused by mutations in ANKH (ankylosis, progressive homolog [mouse]) in the majority of cases, and all of the reported mutations are single amino acid changes. Genomic DNA from an affected patient, his biological parents, and a sibling was amplified and ANKH was sequenced. The affected patient had a complex heterozygous mutation in exon 7 (c.936T > C, c.938C > G, c.942_953delTGGTTGACGGAA), predicting p.Try290Gln and p.Trp292_Glu295del. We studied the effect of the predicted mutation on the subcellular distribution of ANKH protein. Immunofluorescent labeling of COS-7 cells transduced with normal or mutant Ank (murine progressive ankylosis), showed that normal Ank localized to both the plasma membrane and cytoplasm, whereas mutant Ank was detected only in the cytoplasmic compartment. We propose that this craniometaphyseal dysplasia mutation causes a loss of ANKH protein expression and activity in the plasma membrane as a result of aberrant intracellular protein trafficking.
Zajac
Allison
A
Division of Plastic and Reconstructive Surgery, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA.
Baek
Seung-Hak
SH
Salhab
Imad
I
Radecki
Melissa A
MA
Kim
Sukwha
S
Hakonarson
Hakon
H
Nah
Hyun-Duck
HD
D000595:Amino Acid Sequence; D000818:Animals; D000844:Ankylosis / Q000235:genetics; D001483:Base Sequence; D019556:COS Cells; D002648:Child; D002522:Chlorocebus aethiops; D004252:DNA Mutational Analysis; D006579:Heterozygote; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D009154:Mutation; D020125:Mutation, Missense; D010009:Osteochondrodysplasias / Q000235:genetics*; D010641:Phenotype; D028061:Phosphate Transport Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D017384:Sequence Deletion
C498770:ANKH protein, human; D028061:Phosphate Transport Proteins; D011993:Recombinant Fusion Proteins