ABCG8 p.Leu195Gln
| Predicted by SNAP2: | A: D (63%), C: N (61%), D: D (85%), E: D (80%), F: N (57%), G: D (80%), H: D (75%), I: N (66%), K: D (80%), M: N (87%), N: D (75%), P: D (85%), Q: D (71%), R: D (80%), S: D (71%), T: D (63%), V: N (66%), W: D (66%), Y: D (66%), |
| Predicted by PROVEAN: | A: D, C: D, D: D, E: D, F: D, G: D, H: D, I: N, K: D, M: N, N: D, P: D, Q: D, R: D, S: D, T: D, V: D, W: D, Y: D, |
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[hide] Mutations in the human ATP-binding cassette transp... Hum Mutat. 2002 Aug;20(2):151. Heimerl S, Langmann T, Moehle C, Mauerer R, Dean M, Beil FU, von Bergmann K, Schmitz G
Mutations in the human ATP-binding cassette transporters ABCG5 and ABCG8 in sitosterolemia.
Hum Mutat. 2002 Aug;20(2):151., [PMID:12124998]
Abstract [show]
Phytosterolemia or Sitosterolemia is a rare autosomal recessive disorder characterized by highly elevated plasma levels of plant sterols and cholesterol as a consequence of hyperabsorption and impaired biliary secretion of sterols. The disease is caused by mutations in two half size ATP-binding cassette transporters, ABCG5 and ABCG8. We have analyzed the genomic sequence of ABCG5 and ABCG8 in five well-characterized patients with Sitosterolemia. In the first patient we found a heterozygous mutation in exon 8 of the ABCG5 gene leading to a premature termination of the protein (Arg408Ter). This German patient is the first European showing a mutation of the ABCG5 gene. In a second patient we found a novel heterozygous mutation in exon 5 of ABCG8 (c.584T>A; Leu195Gln). Both patients were heterozygous for the identified mutation, but no mutation could be identified on the other chromosome. In three further analyzed patients we found mutations in exons 7, 9 and 11 of the ABCG8 gene, respectively, of which two result in a premature termination signal for translation products. One of these patients was compound heterozygous (Trp361Ter and Arg412Ter), the other was homozygous for Trp361Ter. The third patient was homozygous for an amino acid exchange (Gly574Arg). In conclusion this report describes one novel mutation affecting a highly conserved amino acid and two previously identified mutations in the ABCG8 gene. In addition, we identified for the first time a mutation in the ABCG5 gene of a European Sitosterolemia patient.
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No. Sentence Comment
77 C Y658stop R121stop R164stop Q172stop R184H L195Q P231T G574R G574E L572P L596R N ABC B S AA R263Q E146Q R405H R543S W536stop R412stop W361stop C R419P R419H R408stop R398H N437K R550S R243stop N ABCG5 ABCG8 S B A IVS1 -2A>G Del547C>191stop L501P L596R 1568_1572delTCTTT 1798_1800delTTC Del Exon 3 C336-337insA 201 * Signature 250 ABCG1 Q..EKDEG.R REMVKEILTA L GLLSCANTR TGS.... .LS GGQR KRLAIA ABCG2 ATTMTNHE.K NERINRVIEE L GLDKVADSK VGTQFIR GVS GGER KRTSIG ABCG4 S..EKQEV.K KELVTEILTA L GLMSCSHTR TAL.... .LS GGQR KRLAIA ABCG5 R..RGNPGSF QKKVEAVMAE L SLSHVADRL IGNYSLG GIS TGER RRVSIA ABCG8 PRTFSQAQ.R DKRVEDVIAE L RLRQCADTR VGNMYVR GLS GGER RRVSIG Figure 2: Alignment of the human ABC transporters G1, G2, G4, G5 and G8. The amino acid change Leu195Gln in ABCG8 found in patient 2 is located intracellularly between the Walker A and the Signature C-motif.
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ABCG8 p.Leu195Gln 12124998:77:44
status: VERIFIED8 In a second patient we found a novel heterozygous mutation in exon 5 of ABCG8 (c.584T>A; Leu195Gln).
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ABCG8 p.Leu195Gln 12124998:8:89
status: VERIFIED37 (mg/dl) Gene Mutation Allele 1 Mutation Allele 2 Ethnicity 1 305 246 38 101 31.1 ABCG5 Arg408X - Caucasian / German 2 210 129 67 72 20.3 ABCG8 Leu195Gln - Caucasian 3 218 166 35 84 22.1 ABCG8 Trp361X Arg412X Caucasian 4 247 155 56 189 20.5 ABCG8 Trp361X Trp361X Caucasian 5 214 145 42 90 17.5 ABCG8 Gly574Arg Gly574Arg Caucasian / Swiss Patient 1 was a man who suffered from a myocardial infarction at the age of 31 years.
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ABCG8 p.Leu195Gln 12124998:37:143
status: VERIFIED68 A novel missense mutation producing a nonconservative amino acid change (Leu195Gln) was identified in patient 2.
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ABCG8 p.Leu195Gln 12124998:68:73
status: VERIFIED72 Therefore, it is very likely that the Leu195Gln substitution is the cause of Sitosterolemia in our patient.
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ABCG8 p.Leu195Gln 12124998:72:38
status: VERIFIED