ABCMdb

ABCD1 p.Asn214Asp

Predicted by SNAP2:	A: D (91%), C: D (85%), D: D (91%), E: D (91%), F: D (95%), G: D (85%), H: D (63%), I: D (95%), K: D (95%), L: D (95%), M: D (95%), P: D (95%), Q: D (80%), R: D (95%), S: D (75%), T: D (85%), V: D (95%), W: D (95%), Y: D (95%),
Predicted by PROVEAN:	A: D, C: D, D: N, E: N, F: D, G: D, H: N, I: D, K: D, L: D, M: D, P: D, Q: N, R: N, S: N, T: D, V: D, W: D, Y: N,

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[hide] Identification of novel SNPs of ABCD1, ABCD2, ABCD... Neurogenetics. 2011 Feb;12(1):41-50. Epub 2010 Jul 27. Matsukawa T, Asheuer M, Takahashi Y, Goto J, Suzuki Y, Shimozawa N, Takano H, Onodera O, Nishizawa M, Aubourg P, Tsuji S
Identification of novel SNPs of ABCD1, ABCD2, ABCD3, and ABCD4 genes in patients with X-linked adrenoleukodystrophy (ALD) based on comprehensive resequencing and association studies with ALD phenotypes.
Neurogenetics. 2011 Feb;12(1):41-50. Epub 2010 Jul 27., [PMID:20661612]

Abstract [show]
Adrenoleukodystrophy (ALD) is an X-linked disorder affecting primarily the white matter of the central nervous system occasionally accompanied by adrenal insufficiency. Despite the discovery of the causative gene, ABCD1, no clear genotype-phenotype correlations have been established. Association studies based on single nucleotide polymorphisms (SNPs) identified by comprehensive resequencing of genes related to ABCD1 may reveal genes modifying ALD phenotypes. We analyzed 40 Japanese patients with ALD. ABCD1 and ABCD2 were analyzed using a newly developed microarray-based resequencing system. ABCD3 and ABCD4 were analyzed by direct nucleotide sequence analysis. Replication studies were conducted on an independent French ALD cohort with extreme phenotypes. All the mutations of ABCD1 were identified, and there was no correlation between the genotypes and phenotypes of ALD. SNPs identified by the comprehensive resequencing of ABCD2, ABCD3, and ABCD4 were used for association studies. There were no significant associations between these SNPs and ALD phenotypes, except for the five SNPs of ABCD4, which are in complete disequilibrium in the Japanese population. These five SNPs were significantly less frequently represented in patients with adrenomyeloneuropathy (AMN) than in controls in the Japanese population (p=0.0468), whereas there were no significant differences in patients with childhood cerebral ALD (CCALD). The replication study employing these five SNPs on an independent French ALD cohort, however, showed no significant associations with CCALD or pure AMN. This study showed that ABCD2, ABCD3, and ABCD4 are less likely the disease-modifying genes, necessitating further studies to identify genes modifying ALD phenotypes.

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84 Interestingly, the five previously described SNPs (rs17782508, rs2301345, rs4148077, rs4148078, and rs3742801) that are in complete linkage disequilibrium were significantly less frequently represented in the patients with Japanese AMN than in the controls in the Japanese population (p=0.0468), whereas Table 2 Identified ABCD1 mutations: mutations of ABCD1 that result in amino acid substitutions or in-frame deletions Patient number Phenotype Mutation of ABCD1 Effect of mutation of ABCD1 Position of mutation 13 CCALD 709C>T S108L Loop1 14 CCALD 709C>T S108L Loop1 15 CCALD 829A>G N148S TM2 16 CCALD 1026A>G N214D TM3 17 CCALD 1182G>A G266R Between TM4 and EAA-like 18 CCALD 1324T>Ca L313P Between EAA-like and TM5 19 CCALD 1938C>T R518W Walker A 20 CCALD 1939G>A R518Q Walker A 21 CCALD 2017A>G Q544R Between Walker A and Cons 22 CCALD 2017A>G Q544R Between Walker A and Cons 23 CCALD 2065C>T P560L Between Walker A and Cons 24 CCALD 2065C>T P560L Between Walker A and Cons 25 CCALD Del. 2145-2156 Del. HILQ587-590 Between Walker A and Cons 26 AdultCer Del. 1257-1259 Del.E291 EAA-like 27 AdultCer 2005T>C F540S Between Walker A and Cons 28 AdultCer 2358C>T R660W C-terminal to Walker B 29 AdultCer 2385C>A H667N C-terminal to Walker B 30 AMN-Cer 1146A>C T254P TM4 31 AMN 636C>T P84S TM1 32 AMN 709C>T S108L Loop1 33 AMN 1182G>A G266R Between TM4 and EAA-like 34 AMN 1197G>A E271K Between TM4 and EAA-like 35 AMN 1215G>Aa G277R Between TM4 and EAA-like 36 AMN 1255C>G S290W EAA-like 37 AMN 1581C>T R401W Between TM6 and Walker A 38 AMN 2233C>A A616D Cons 39 AMN 2385C>A H667N C-terminal to Walker B 40 Asymptomatic 2211G>A E609K Cons Amino acid residue numbers in ALDP are based on Mosser et al. [1]. Login to comment

[hide] Mutational analysis and genotype-phenotype correla... Arch Neurol. 1999 Mar;56(3):295-300. Takano H, Koike R, Onodera O, Sasaki R, Tsuji S
Mutational analysis and genotype-phenotype correlation of 29 unrelated Japanese patients with X-linked adrenoleukodystrophy.
Arch Neurol. 1999 Mar;56(3):295-300., [PMID:10190819]

Abstract [show]
BACKGROUND: X-linked adrenoleukodystrophy (ALD) is an inherited disease characterized by progressive neurologic dysfunction, occasionally associated with adrenal insufficiency. The classic form of ALD usually has onset in childhood (childhood cerebral ALD), with rapid neurologic deterioration leading to a vegetative state. Adult-onset cerebral ALD also presents with rapidly progressive neurologic dysfunction. Milder phenotypes such as adrenomyeloneuropathy and Addison disease only also have been recognized. Despite discovery of the causative gene, a molecular basis for the diverse clinical presentations remains to be elucidated. OBJECTIVES: To conduct mutational analyses in 29 Japanese patients with ALD from 29 unrelated families, to obtain knowledge of the spectrum of mutations in this gene, and to study genotype-phenotype correlations in Japanese patients. METHODS: The 29 patients comprised 13 patients with childhood cerebral ALD, 11 patients with adult-onset cerebral ALD, and 5 patients with adrenomyeloneuropathy. We conducted detailed mutational analyses of 29 unrelated Japanese patients with ALD by genomic Southern blot analysis and direct nucleotide sequence analysis of reverse transcriptase-polymerase chain reaction products derived from total RNA that was extracted from cultured skin fibroblasts, lymphoblastoid cells, or peripheral blood leukocytes. RESULTS: Three patients with adult-onset cerebral ALD were identified as having large genomic rearrangements. The remaining 26 patients were identified as having 21 independent mutations, including 12 novel mutations resulting in small nucleotide alterations in the ALD gene. Eighteen (69%) of 26 mutations were missense mutations. Most missense mutations involved amino acids conserved in homologous gene products, including PMP70, mALDRP, and Pxa1p. The AG dinucleotide deletion at position 1081-1082, which has been reported previously to be the most common mutation in white patients (12%-17%), was also identified as the most common mutation in Japanese patients (12%). All phenotypes were associated with mutations resulting in protein truncation or subtle amino acid changes. There were no differences in phenotypic expressions between missense mutations involving conserved amino acids and those involving nonconserved amino acids. CONCLUSIONS: There are no obvious correlations between the phenotypes of patients with ALD and their genotypes, suggesting that other genetic or environmental factors modify the phenotypic expressions of ALD.

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42 Mutations in the ALD Gene That Result in Amino Acid Substitutions or In-frame Deletions* Patient No. Phenotype Mutation† Exon Effect of Mutation‡ Position of Mutation§ Amino Acid Identityሻ Family DataPMP70 mALDRP Pxa1p Amino Acid Deletion G4010 ACALD del.1256-1258 1 del.E291 EAA-like motif E E E CCALD G4011(s) ACALD del.2146-2157¶ 7 del.HILQ587-590 Between Walker A and B# HILE HIVQ YLLK No family history Missense Mutation G4012 CCALD A829G 1 N148S TM3 N N N AMN G1986 CCALD G984A¶ 1 D200N TM4 D D D ACALD G4013 CCALD A1026G¶ 1 N214D TM4 N N N Not available G4014 AMN G1182A 1 G266R Between TM5 and EAA motif G G Non AMN G4015(s) CCALD G1182A 1 G266R Between TM5 and EAA motif G G Non No family history G4016(s) AMN G1197A 1 E271K Between TM5 and EAA motif T E R No family history G4017(s) ACALD A1273G¶ 1 Y296C EAA motif Y Y Y No family history G4018 CCALD A1273G¶ 1 Y296C EAA motif Y Y Y Not available G4019 AMN C1587T¶ 3 R401W Between TM6 and Walker A R R R Asymptomatic carrier G4020 CCALD G1906T¶ 6 G507V Walker A# G G G Not available G4021 CCALD G1939A 6 R518Q Walker A# R R R CCALD G4022 CCALD G1939A 6 R518Q Walker A# R R R Not available G4023 ACALD T2005C¶ 6 F540S Between Walker A and B# F F F Adult asymptomatic carrier G4024(s) CCALD A2017G 6 Q544R Between Walker A and B# Q Q Q No family history G4025 CCALD C2065T 7 S560L Between Walker A and B# P P P Adult asymptomatic carrier G2469(s) ACALD C2157T¶ 7 R591W Between Walker A and B# R R R No family history G2022(s) AMN C2203T 8 S606L Between Walker A and B# S S S No family history G4026 ACALD C2364T 8 R660W C-terminal to Walker B R R R ACALD *ALD indicates adrenoleukodystrophy; ACALD, adult-onset cerebral ALD; CCALD, childhood cerebral ALD; AMN, adrenomyeloneuropathy; (s), apparently sporadic patients; and del., delete. Login to comment