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Novel mutations in the microsomal triglyceride transfer protein gene causing abetalipoproteinemia.

Authors: Ohashi, K  Ishibashi, S  Osuga, J  Tozawa, R  Harada, K  Yahagi, N  Shionoiri, F  Iizuka, Y  Tamura, Y  Nagai, R  Illingworth, DR  Gotoda, T  Yamada, N 
Citation: Ohashi K, etal., J Lipid Res. 2000 Aug;41(8):1199-204.
Pubmed: (View Article at PubMed) PMID:10946006

Abetalipoproteinemia (ABL) is an inherited disease characterized by the virtual absence of apolipoprotein B (apoB)-containing lipoproteins from plasma. Only limited numbers of families have been screened for mutations in the microsomal triglyceride transfer protein (MTP) gene. To clarify the genetic basis of clinical diversity of ABL, mutations of the MTP gene have been screened in 4 unrelated patients with ABL. Three novel mutations have been identified: a frameshift mutation caused by a single adenine deletion at position 1389 of the cDNA, and a missense mutation, Asn780Tyr, each in homozygous forms; and a splice site mutation, 2218-2A-->G, in a compound heterozygous form. The frameshift and splice site mutations are predicted to encode truncated forms of MTP. When transiently expressed in Cos-1 cells, the Asn780Tyr mutant MTP bound protein disulfide isomerase (PDI) but displayed negligible MTP activity. It is of interest that the patient having the Asn780Tyr mutation, a 27-year-old male, has none of the manifestations characteristic of classic ABL even though his plasma apoB and vitamin E were virtually undetectable. These results indicated that defects of the MTP gene are the proximal cause of ABL.


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RGD Object Information
RGD ID: 1581044
Created: 2006-09-12
Species: All species
Last Modified: 2006-09-12
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.