ABCD1 p.Asn148Ser
ClinVar: |
c.443A>G
,
p.Asn148Ser
D
, Pathogenic
|
Predicted by SNAP2: | A: D (91%), C: D (91%), D: D (95%), E: D (95%), F: D (95%), G: D (95%), H: D (91%), I: D (95%), K: D (95%), L: D (95%), M: D (95%), P: D (95%), Q: D (95%), R: D (95%), S: D (91%), T: D (91%), V: D (95%), W: D (95%), Y: D (95%), |
Predicted by PROVEAN: | A: D, C: D, D: D, E: D, F: D, G: D, H: D, I: D, K: D, L: D, M: D, P: D, Q: D, R: D, S: D, T: D, V: D, W: D, Y: D, |
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[hide] Mutational and protein analysis of patients and he... Am J Hum Genet. 1996 Jun;58(6):1135-44. Feigenbaum V, Lombard-Platet G, Guidoux S, Sarde CO, Mandel JL, Aubourg P
Mutational and protein analysis of patients and heterozygous women with X-linked adrenoleukodystrophy.
Am J Hum Genet. 1996 Jun;58(6):1135-44., [PMID:8651290]
Abstract [show]
X-linked adrenoleukodystrophy (ALD), a neurodegenerative disorder associated with impaired beta-oxidation of very-long-chain fatty acids (VLCFA), is due to mutations in a gene encoding a peroxisomal ATP-binding cassette (ABC) transporter (ALD protein [ALDP]). We analyzed the open reading frame of the ALD gene in 44 French ALD kindred by using SSCP or denaturing gradient-gel electrophoresis and studied the effect of mutations on ALDP by immunocytofluorescence and western blotting of fibroblasts and/or white blood cells. Mutations were detected in 37 of 44 kindreds and were distributed over the whole protein-coding region, with the exception of the C terminus encoded in exon 10. Except for two mutations (delAG1801 and P560L) observed four times each, nearly every ALD family has a different mutation. Twenty-four of 37 mutations were missense mutations leading to amino acid changes located in or close to putative transmembrane segments (TMS 2, 3, 4, and 5), in the EAA-like motif and in the nucleotide fold of the ATP-binding domain of ALDP. Of 38 ALD patients tested, 27 (71%) lacked ALDP immunoreactivity in their fibroblasts and/or white blood cells. More than half of missense mutations studied (11 of 21) resulted in a complete lack of ALDP immunoreactivity, and six missense mutations resulted in decreased ALDP expression. The fibroblasts and/or white blood cells of 15 of 15 heterozygous carrier from ALD kindred with no ALDP showed a mixture of positive- and negative-ALDP immunoreactivity due to X-inactivation. Since 5%-15% of heterozygous women have normal VLCFA levels, the immunodetection of ALDP in white blood cells can be applicable in a majority of ALD kindred, to identify heterozygous women, particularly when the ALD gene mutation has not yet been identified.
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No. Sentence Comment
76 58:1135-1144, 1996 Table 2 Mutations in the ALD Gene in Studied Patients AMINO ACID MUTATIONSb HOMOLOGUE INd KINDRED CLINICAL LOCALIZATION AMINO ACID ALDP BY NUMBER PHENOTYPEa DNA CpG Exon IN PROTEINC ALTERATION h/m ALDRP hPMP70 IF/WB' CALD, AMN CALD CALD CALD, AS AD CALD, AMN CALC AD AD AD ALMD CALD CALD, AMN CALD CALD, AMN, AD AMN ALMD CALD ALMD CALD AMN ALD AD, AMN, AS CALD, AS CALD CALD AD CALD AMN, ALMD CALD CALD AMN, ALMD CALD CALD, AMN, ALMD CALD CALD, ALMD, AS ALMD CALD AMN CALD, AMN AD AD AMN CALD G416A Ins T524 C679T C679T C700T C709G G732A A829G C840T Del TA927-28 A928G A985T A1048G DeIGC1080-81 C1174T G1266A ins C1521 1636delC DelAG 1801-02 DelAG 1801-02 DelAG 1801-02 DelAG 1801-02 ins TGG 1848 G 1920 A C1938T C1938T G1950A C2065T C2065T C2065T C2065T C2065G G 2166+1 A T2202C DelGC 2335 C2364T C2364T No mutation found No mutation found No mutation found No mutation found No mutation found No mutation found No mutation found 1 1 + 1 + 1 1 1 + 1 1 + 1 1 1 1 1 1 1 + 1 3 4 S 5 S S S 6 + 6 + 6 6 + 7 + 7 + 7 + 7 + 7 + 7 8 9 9 9 W10 X Frameshift at L46 TMS2 S98L TMS2 S98L T1OSI S108W G116R TMS3 N148S TMS3 R152C Frameshift at Y180 Y181C TMS4 D200V TMS4 D221G Frameshift at R231 P263L EAA-like A294T Frameshift at V378 Frameshift at T416 Frameshift at E471 Frameshift at E471 Frameshift at E471 Frameshift at E471 ins val 491 Walker A G512S Walker A R518W Walker A R518W G 522 W P560L P560L P560L P560L P56OR Splice at G593 Walker B S606P Frameshift at D649 R660W R660W Absent Not done S A Present S A Present T T Absent S D Decreased G T Absent N N Present R K Present Absent Y Y Not done D D Not done D D Absent Absent P R Decreased A A Not done Absent Absent Absent Absent Absent Absent Absent G G Absent R R Absent R R Decreased G E Absent P P Decreased P P Decreased P P Decreased P P Absent P P Absent Not done S S Absent Absent R R Absent R R Absent Not done Absent Absent Absent Present Absent Absent a CALD = cerebral ALD (5-15 years); AMN = adrenomyeloneuropathy; ALMD = adrenomyeloneuropathy with cerebral involvement; AD = Addison disease; AS = Asymptomatic.
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ABCD1 p.Asn148Ser 8651290:76:1117
status: NEW174 Three missense mutations (S98L, N148S, and R152C) resulted in the synthesis of a stable but presumably nonfunctioning protein.
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ABCD1 p.Asn148Ser 8651290:174:32
status: NEW75 58:1135-1144, 1996 Table 2 Mutations in the ALD Gene in Studied Patients AMINO ACID MUTATIONSb HOMOLOGUE INd KINDRED CLINICAL LOCALIZATION AMINO ACID ALDP BY NUMBER PHENOTYPEa DNA CpG Exon IN PROTEINC ALTERATION h/m ALDRP hPMP70 IF/WB' CALD, AMN CALD CALD CALD, AS AD CALD, AMN CALC AD AD AD ALMD CALD CALD, AMN CALD CALD, AMN, AD AMN ALMD CALD ALMD CALD AMN ALD AD, AMN, AS CALD, AS CALD CALD AD CALD AMN, ALMD CALD CALD AMN, ALMD CALD CALD, AMN, ALMD CALD CALD, ALMD, AS ALMD CALD AMN CALD, AMN AD AD AMN CALD G416A Ins T524 C679T C679T C700T C709G G732A A829G C840T Del TA927-28 A928G A985T A1048G DeIGC1080-81 C1174T G1266A ins C1521 1636delC DelAG 1801-02 DelAG 1801-02 DelAG 1801-02 DelAG 1801-02 ins TGG 1848 G 1920 A C1938T C1938T G1950A C2065T C2065T C2065T C2065T C2065G G 2166+1 A T2202C DelGC 2335 C2364T C2364T No mutation found No mutation found No mutation found No mutation found No mutation found No mutation found No mutation found 1 1 + 1 + 1 1 1 + 1 1 + 1 1 1 1 1 1 1 + 1 3 4 S 5 S S S 6 + 6 + 6 6 + 7 + 7 + 7 + 7 + 7 + 7 8 9 9 9 W10 X Frameshift at L46 TMS2 S98L TMS2 S98L T1OSI S108W G116R TMS3 N148S TMS3 R152C Frameshift at Y180 Y181C TMS4 D200V TMS4 D221G Frameshift at R231 P263L EAA-like A294T Frameshift at V378 Frameshift at T416 Frameshift at E471 Frameshift at E471 Frameshift at E471 Frameshift at E471 ins val 491 Walker A G512S Walker A R518W Walker A R518W G 522 W P560L P560L P560L P560L P56OR Splice at G593 Walker B S606P Frameshift at D649 R660W R660W Absent Not done S A Present S A Present T T Absent S D Decreased G T Absent N N Present R K Present Absent Y Y Not done D D Not done D D Absent Absent P R Decreased A A Not done Absent Absent Absent Absent Absent Absent Absent G G Absent R R Absent R R Decreased G E Absent P P Decreased P P Decreased P P Decreased P P Absent P P Absent Not done S S Absent Absent R R Absent R R Absent Not done Absent Absent Absent Present Absent Absent a CALD = cerebral ALD (5-15 years); AMN = adrenomyeloneuropathy; ALMD = adrenomyeloneuropathy with cerebral involvement; AD = Addison disease; AS = Asymptomatic.
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ABCD1 p.Asn148Ser 8651290:75:1117
status: NEW175 Three missense mutations (S98L, N148S, and R152C) resulted in the synthesis of a stable but presumably nonfunctioning protein.
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ABCD1 p.Asn148Ser 8651290:175:32
status: NEW[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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No. Sentence Comment
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].
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ABCD1 p.Asn148Ser 20661612:84:585
status: NEW[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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No. Sentence Comment
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.
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ABCD1 p.Asn148Ser 10190819:42:477
status: NEW88 It is well known that more than 1 clinical phenotype can appear within a single pedigree.6-8 In 1 kindred, a missense mutation was associated with 5 different phenotypes.43 In the present study, 1 patient with CCALD with the A829G (N148S) mutation had a brother with AMN.
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ABCD1 p.Asn148Ser 10190819:88:232
status: NEW[hide] Co-expression of mutated and normal adrenoleukodys... Hum Mol Genet. 2000 Nov 1;9(18):2609-16. Unterrainer G, Molzer B, Forss-Petter S, Berger J
Co-expression of mutated and normal adrenoleukodystrophy protein reduces protein function: implications for gene therapy of X-linked adrenoleukodystrophy.
Hum Mol Genet. 2000 Nov 1;9(18):2609-16., [PMID:11063720]
Abstract [show]
Inherited defects in the X-chromosomal adrenoleukodystrophy (ALD; ABCD1) gene are the genetic cause of the severe neurodegenerative disorder X-linked adrenoleukodystrophy (X-ALD). Biochemically the accumulation of very long-chain fatty acids, caused by impaired peroxisomal beta-oxidation, is the pathognomonic characteristic of the disease. Due to the X-chromosomal inheritance of X-ALD no data are available to clarify the question whether mutated adrenoleukodystrophy proteins (ALDPs) can negatively influence normal ALDP function. Here we show that restoration of beta-oxidation in X-ALD fibroblasts following transient transfection with normal ALD cDNA is more effective in ALDP-deficient fibroblasts compared with fibroblasts expressing normal amounts of mutated ALDP. Furthermore, we utilized the HeLa Tet-on system to construct a stable HeLa cell line expressing a constant level of endogenous ALDP and doxycycline-inducible levels of mutated ALDP. The induction was doxycycline dosage-dependent and the ALDP correctly localized. Interestingly, although mutated ALDP increased >6-fold in a dosage-dependent manner the total amount of ALDP (mutated and normal) remained approximately even as demonstrated by western blot and flow cytometric analyses. Thus, apparently mutated and normal ALDP compete for integration into a limited number of sites in the peroxisomal membrane. Consequently, increased amounts of mutated ALDP resulted in decreased peroxisomal beta-oxidation and accumulation of very long-chain fatty acids. These findings have direct implications on future gene therapy approaches for treatment of X-ALD, since in some patients a non-functional endogenous protein could act in a dominant negative way or displace the introduced, normal protein.
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No. Sentence Comment
49 Average transfection efficiency was determined in three independent experiments and was 14% for the ALDP-deficient cell line (range 10-17%), 20% for the D194H cell line (range 15-23%), 26% for the S213C cells and 24% for the N148S cell line (range 22-30%).
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ABCD1 p.Asn148Ser 11063720:49:225
status: NEW51 Transient transfection of normal ALD cDNA into X-ALD fibroblast cell lines: A626T lack detectable ALDP, whereas N148S, D194H and S312C cell lines produce stable, mutated ALDP.
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ABCD1 p.Asn148Ser 11063720:51:112
status: NEW160 Three different fibroblast cell lines described as having normal levels of non-functional ALDP were obtained: fibroblasts N148S (26-29, patient 55 in ref. 26) were kindly provided by Dr Aubourg (Paris), D194H (kindred no.
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ABCD1 p.Asn148Ser 11063720:160:122
status: NEW[hide] Missense mutations are frequent in the gene for X-... Hum Mol Genet. 1994 Oct;3(10):1903-5. Fuchs S, Sarde CO, Wedemann H, Schwinger E, Mandel JL, Gal A
Missense mutations are frequent in the gene for X-chromosomal adrenoleukodystrophy (ALD).
Hum Mol Genet. 1994 Oct;3(10):1903-5., [PMID:7849723]
Abstract [show]
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No. Sentence Comment
35 (A) Detection of A829G (N148S) in ALD exon 1.
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ABCD1 p.Asn148Ser 7849723:35:24
status: NEW43 These missense mutations are (positions of nucleotides and amino acids according to the ALD cDNA sequence in ref. 4) A829G (N148S), T906G (Y174D), Gl 182A (G266R), G1588A (R401Q), C1638T (R418W), and C1930T (S515F).
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ABCD1 p.Asn148Ser 7849723:43:124
status: NEW44 Co-segregation was confirmed between the disease phenotype and the mutations predicting Y174D, and S515F (Fig. 3), as well as for G266R (Fig. 1), and N148S (data not shown).
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ABCD1 p.Asn148Ser 7849723:44:150
status: NEW[hide] Preferential expression of mutant ABCD1 allele is ... Orphanet J Rare Dis. 2012 Jan 26;7:10. doi: 10.1186/1750-1172-7-10. Salsano E, Tabano S, Sirchia SM, Colapietro P, Castellotti B, Gellera C, Rimoldi M, Pensato V, Mariotti C, Pareyson D, Miozzo M, Uziel G
Preferential expression of mutant ABCD1 allele is common in adrenoleukodystrophy female carriers but unrelated to clinical symptoms.
Orphanet J Rare Dis. 2012 Jan 26;7:10. doi: 10.1186/1750-1172-7-10., [PMID:22280810]
Abstract [show]
BACKGROUND: Approximately 20% of adrenoleukodystrophy (X-ALD) female carriers may develop clinical manifestations, typically consisting of progressive spastic gait, sensory deficits and bladder dysfunctions. A skewing in X Chromosome Inactivation (XCI), leading to the preferential expression of the X chromosome carrying the mutant ABCD1 allele, has been proposed as a mechanism influencing X-linked adrenoleukodystrophy (X-ALD) carrier phenotype, but reported data so far are conflicting. METHODS: To shed light into this topic we assessed the XCI pattern in peripheral blood mononuclear cells (PBMCs) of 30 X-ALD carriers. Since a frequent problem with XCI studies is the underestimation of skewing due to an incomplete sample digestion by restriction enzymes, leading to variable results, we developed a pyrosequencing assay to identify samples completely digested, on which to perform the XCI assay. Pyrosequencing was also used to quantify ABCD1 allele-specific expression. Moreover, very long-chain fatty acid (VLCFA) levels were determined in the same patients. RESULTS: We found severely (>/=90:10) or moderately (>/=75:25) skewed XCI in 23 out of 30 (77%) X-ALD carriers and proved that preferential XCI is mainly associated with the preferential expression of the mutant ABCD1 allele, irrespective of the manifestation of symptoms. The expression of mutant ABCD1 allele also correlates with plasma VLCFA concentrations. CONCLUSIONS: Our results indicate that preferential XCI leads to the favored expression of the mutant ABCD1 allele. This emerges as a general phenomenon in X-ALD carriers not related to the presence of symptoms. Our data support the postulated growth advantage of cells with the preferential expression of the mutant ABCD1 allele, but argue against the use of XCI pattern, ABCD1 allele-specific expression pattern and VLCFA plasma concentration as biomarkers to predict the development of symptoms in X-ALD carriers.
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No. Sentence Comment
53 All samples were tested in Table 1 Clinical Findings, Genotype, X-Chromosome Inactivation (XCI), ABCD1 Allele-Specific Expression (ASE) and Biochemical Findings (VLCFA plasma levels) of X-ALD carriers Nr of family, consultants Age (yrs) Presence of symptoms (age at onset, yrs) Mutations XCI pattern ABCD1 ASE (mut:wt) C26 (nv) C26/C22 (nv) C24/C22 (nv) F1 II-3 67 Yes (45) 410G > A W137X 97:03 84:16 1,09 (<0,75) 48 (<17) 1644 (<1100) F1 III-2 34 No 410G > A W137X 91:09 nd 0,58 (<0,75) 47 (<17) 1482 (<1100) F2 I-2 61 Yes (59) 427C > G P143A 71:29 93:07 0,85 (<0,75) 18 (<17) 1222 (<1100) F2 II-1 38 No 427C > G P143A 85:15 83:17 nd nd nd F2 II-2 35 No 427C > G P143A 76:24 77:23 nd nd nd F3 II-2 73 Yes (45) 428C > A P143H 60:40 38:62 1,45 (<1,50) 28 (<40) 700 (<820) F3 III.1 46 No 428C > A P143H 84:16 84:16 1,53 (<1,50) 40 (<40) 860 (<820) F3 III-2 50 No 428C > A P143H 83:17 75:25 1,75 (<1,50) 37 (<40) 733 (<820) F4 II-3 75 Yes (50) 652C > T; 664G > T P218S; V222L 81:19 82:18 1,57 (<0,75) 19 (<17) 1680 (<1100) F4 III-1 44 No 652C > T; 664G > T P218S; V222L 83:17 81:19 2,38 (<1,50) 53 (<40) 1424 (<820) F4 III-3 45 Yes (29) 652C > T; 664G > T P218S; V222L 89:11 82:18 1,00 (<0,75) 36 (<17) 1611 (<1100) F5 II-1 55 Yes (54) 1202G > A R401Q 98:02 82:18 1,96 (<1,50) 38 (<40) 1031 (<820) F6 II-1 76 Yes (58) 1727T > C L576P 73:27 76:24 2,10 (<0,75) 21 (<17) 1039 (<1100) F7 I-2 72 No 1772G > A R591Q n/a n/a 1,23 (<1,5) 16 (<40) 798 (<820) F7 II-1 44 Yes (34) 1772G > A R591Q 96:04 97:03 2,7 (<1,50) 56 (<40) 957 (<820) F8 II-1 62 Yes (40) 1992G > A W664X 83:17 82:18 3,08 (<1,50) 56 (<40) 1132 (<820) F9 II-1 63 No 293C > T S98L 83:17 93:07 1,82 (<1,50) 37 (<40) 888 (<820) F9 II-3 57 No 293C > T S98L 79:21 75:25 1,99 (<1,50) 42 (<40) 913 (<820) F9 III-2 20 No 293C > T S98L 75:25 61:39 2,65 (<1,50) 46 (<40) 1149 (<820) F10 I-2 63 No 443A > G N148S 86:14 42:58 2,16 (<1,50) 42 (<40) 788 (<820) F10 II-2 40 No 443A > G N148S 96:04 84:16 2,17 (<1,50) 43 (<40) 757 (<820) F11 III-1 67 No 1165C > T R389C 52:48 72:28 0,7 (<1,50) 13 (<40) 572 (<820) F11 III-3 64 No 1165C > T R389C 78:22 34:66 1,1 (<1,50) 16 (<40) 823 (<820) F11 III-5 49 No 1165C > T R389C 98:02 20:80 1,05 (<1,50) 16 (<40) 848 (<820) F11 III-6 46 No 1165C > T R389C 71:29 74:26 1,30 (<1,50) 18 (<40) 1000 (<820) F11 V-1 26 No 1165C > T R389C 57:43 58:42 0,68 (<1,50) 14 (<40) 663 (<820) F12 I-2 53 No 1211C > A S404X 95:05 09:91 nd nd nd F13 I-2 60 No del. ex8-10 n/a 76:24 nd nd nd nd duplicate and one male DNA sample was included in each experiment as a control for enzymatic digestion.
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ABCD1 p.Asn148Ser 22280810:53:1854
status: NEWX
ABCD1 p.Asn148Ser 22280810:53:1929
status: NEW