Autosomal recessive hypercholesterolemia caused by mutations in a putative LDL receptor adaptor protein.
Atherogenic low density lipoproteins are cleared from the circulation by hepatic low density lipoprotein receptors (LDLR). Two inherited forms of hypercholesterolemia result from loss of LDLR activity: autosomal dominant familial hypercholesterolemia (FH), caused by mutations in the LDLR gene, and autosomal recessive hypercholesterolemia (ARH), of unknown etiology. Here we map the ARH locus to an approximately 1-centimorgan interval on chromosome 1p35 and identify six mutations in a gene encoding a putative adaptor protein (ARH). ARH contains a phosphotyrosine binding (PTB) domain, which in other proteins binds NPXY motifs in the cytoplasmic tails of cell-surface receptors, including the LDLR. ARH appears to have a tissue-specific role in LDLR function, as it is required in liver but not in fibroblasts.
Garcia
C K
CK
McDermott Center for Human Growth and Development and Department of Internal Medicine, University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA.
Wilund
K
K
Arca
M
M
Zuliani
G
G
Fellin
R
R
Maioli
M
M
Calandra
S
S
Bertolini
S
S
Cossu
F
F
Grishin
N
N
Barnes
R
R
Cohen
J C
JC
Hobbs
H H
HH
D000293:Adolescent; D000328:Adult; D000595:Amino Acid Sequence; D001665:Binding Sites; D002352:Carrier Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D002648:Child; D002675:Child, Preschool; D002874:Chromosome Mapping; D002878:Chromosomes, Human, Pair 1 / Q000235:genetics*; D003001:Cloning, Molecular; D005091:Exons / Q000235:genetics; D005260:Female; D005347:Fibroblasts; D005808:Genes, Recessive / Q000235:genetics*; D006720:Homozygote; D006801:Humans; D006937:Hypercholesterolemia / Q000235:genetics* / Q000378:metabolism / Q000503:physiopathology; D007438:Introns / Q000235:genetics; D007558:Italy; D007861:Lebanon; D008099:Liver / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics*; D009928:Organ Specificity; D010375:Pedigree; D019000:Phosphotyrosine / Q000378:metabolism; D011485:Protein Binding; D012333:RNA, Messenger / Q000032:analysis / Q000235:genetics; D011973:Receptors, LDL / Q000378:metabolism*; D016415:Sequence Alignment; D020798:Two-Hybrid System Techniques
D002352:Carrier Proteins; D012333:RNA, Messenger; D011973:Receptors, LDL; D019000:Phosphotyrosine