ABCMdb

ABCG5 p.Asn437Lys

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Publications

PMID: 11668628 [PubMed] Hubacek JA et al: "Mutations in ATP-cassette binding proteins G5 (ABCG5) and G8 (ABCG8) causing sitosterolemia."

No. Sentence Comment

4 In this paper we describe three novel mutations causing sitosterolemia: 1) a frameshift mutation (c.336-337insA) in ABCG5 that results in premature termination of the protein at amino acid 197; 2) a missense mutation that changes a conserved residue c.1311C>G; N437K) in ABCG5 and 3) a splice site mutation in ABCG8 (IVS1-2A>G). Login to comment
31 A cytosine to guanine substitution was found in exon 9 of ABCG5, which resulted in the substitution of lysine for asparagine at amino acid 437. Login to comment
58 The second mutation results in the substitution of a basic amino acid for an uncharged amino acid (N437K) in a putative transmembrane domain. Login to comment

PMID: 12124998 [PubMed] Heimerl S et al: "Mutations in the human ATP-binding cassette transporters ABCG5 and ABCG8 in sitosterolemia."

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. Login to comment

PMID: 15054092 [PubMed] Graf GA et al: "Missense mutations in ABCG5 and ABCG8 disrupt heterodimerization and trafficking."

No. Sentence Comment

203 No mature G5 was present in cells expressing G5 with the R389H, R419H, or N437K mutations. Login to comment
221 These analyses were performed using a trafficking-defective mutant of G5, N437K. Login to comment
247 When the trafficking-defective mutant of G5 (N437K) was coexpressed with G8, the pattern of G5 was virtually identical to that obtained when G5 was expressed alone, indicating that the presence of G8 had no effect on the size or on the processing of the mutant G5. Login to comment
202 No mature G5 was present in cells expressing G5 with the R389H, R419H, or N437K mutations. Login to comment
220 These analyses were performed using a trafficking-defective mutant of G5, N437K. Login to comment
246 When the trafficking-defective mutant of G5 (N437K) was coexpressed with G8, the pattern of G5 was virtually identical to that obtained when G5 was expressed alone, indicating that the presence of G8 had no effect on the size or on the processing of the mutant G5. Login to comment
245 When the trafficking-defective mutant of G5 (N437K) was coexpressed with G8, the pattern of G5 was virtually identical to that obtained when G5 was expressed alone, indicating that the presence of G8 had no effect on the size or on the processing of the mutant G5. Login to comment

PMID: 20521169 [PubMed] Niu DM et al: "Clinical observations, molecular genetic analysis, and treatment of sitosterolemia in infants and children."

No. Sentence Comment

1 We report clinical, biochemical, and molecular genetic observations and treatment outcomes for five Chinese children from four separate families presenting with sitosterolemia in whom we identified two new (Y329X, G269R) and three known (R446X, N437K, R389H) mutations in the ABCG5 gene. Login to comment
23 Large peaks of serum plant sterols were identified by nuclear magnetic resonance (NMR) spectroscopy, but the exact concentrations of these sterols were unable to be Table 1 Baseline lipid profiles, liver enzymes, and blood cell counts of each study patient Patient no Normal values 1 2 3 4 5 Age at diagnosis 8 years 18 months 3 months 23 months 12 years Mutation (ABCG5) Y329X R389H R389H R389H R389H N437K R446X R446X R389H G269R Initial diagnostic data Cholesterol, mg/dl Total 125-240 427 705 402 640 343 Low-density-lipoprotein 60-150 346 565 304 519 263 High-density-lipoprotein 35-84 59 64 42 64 50 Total triglycerides, mg/dl 20-200 111 149 395a 98 98 Liver enzymes Alanine transaminase, U/l 5-45 10 13 45 15 44 Aspartate aminotransferase, U/l 15-55 19 31 100 31 37 Blood count Erythrocytes, count/µl 3.7×109 -5.3×109 3.35×109 4.25×109 3.98×109 4.49×109 4.46×109 Hemoglobin, g/dl 11.5-15.5 9.8 11.8 11 12.7 12.9 Mean corpuscular volume, fl 80-95 88.5 89.0 80.6 80.2 86 White blood cells, count/µl 4,500-17,500 7,200 6,900 6,700 11,200 5,200 Platelets, count/mm3 150×106 -350×106 211×106 289×106 506×106 566×106 293×106 After ezetimibe therapy Age at plant sterols analysis NA 5 years 3 years 3 year 13 year Duration of ezetimibe treatment NA 3 years 1 year 1 year 6 months Cholesterol, total (mg/dl) 125-240 NA 181 208 223 193 Sitosterol mg/dlb 0.216±0.220 (SD)c NA 7.10 9.17 7.07 6.14 Campesterol mg/dlb 0.309±0.165 (SD)c NA 3.79 4.78 4.04 4.22 NA not available a In the nonfasting state b Plant sterols were measured by gas chromatography/mass spectrometry, as previously described (Kwiterovich et al. 2003). Login to comment
77 The other mutation, N437K (c.1311C>G), located in exon 9, substituted an asparagine to a lysine at codon 437. Login to comment
75 Results of mutation analyses Patient 1 had compound heterozygous mutations, p.Y329X and p.N437K. Login to comment

PMID: 21664501 [PubMed] Keller S et al: "Increased plasma plant sterol concentrations and a heterozygous amino acid exchange in ATP binding cassette transporter ABCG5: a case report."

No. Sentence Comment

57 In addition to splicing, insertions, deletion, and complete rearrangement of the ABCG5 gene,13 mutations with an amino acid exchange resulting in sitosterolemia are published (Gln22Term [14], Glu77Term [15], Glu146Gln [16], Arg243Term [17], Gly269Arg, Tyr329Term [7], Arg389His, Arg408Term, Arg419His, Arg419Pro [17], Asn437Lys [18], Arg446Term [1], Arg550Ser [16]). Login to comment
58 Five of the 13 mutations are located in exon 9 of the ABCG5 gene (Arg389His, Arg408Term, Arg419His, Arg419Pro, Asn437Lys) corresponding to our findings regarding the amino acid exchange Arg406Gln. Login to comment