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NA20949 DNA from Fibroblast

Description:

CONGENITAL DISORDER OF GLYCOSYLATION, TYPE Ic
ALG6, S. CEREVISIAE, HOMOLOG OF

Affected:

Yes

Sex:

Female

Age:

21 YR (At Sampling)

  • Overview
  • Characterizations
  • Phenotypic Data
  • Publications
  • External Links

Overview

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Repository NIGMS Human Genetic Cell Repository
Subcollection Heritable Diseases
Quantity 10 µg
Quantitation Method Please see our FAQ
Biopsy Source Unspecified
Cell Type Fibroblast
Tissue Type Skin
Transformant Untransformed
Sample Source DNA from Fibroblast
Relation to Proband proband
Confirmation Molecular characterization before cell line submission to CCR
Species Homo sapiens
Common Name Human
Remarks Clinically affected; decreased fetal movements during pregnancy; birth weight = 3,500 g; spells of cyanosis and apnea during feeding in first 2 weeks of life; radiological evaluation showed bilateral reduction deformities of distal phalanges of digits II to IV in both hands and absence of the mid and distal phalanges on digits II to IV in the feet; right great toe has reduction of proximal phalanx and absence of distal phalanx; sat at 15 months, cruised at 3 years, walked independently at 5 years, first words at 5 years; 2 episodes of generalized epilepsy at age 20 months with normal EEG; grand mal seizures at ages 9 and 12 years; menarche at 15 years; irregular menses treated with medroxyprogesterone but followed by development of hirsutism; switched to triphasic contraceptive but excessive weight gain continued and male pattern frontal balding developed; pronounced virilization; deep vein thrombosis of left superficial femoral and deep popliteal vein developed at age 19 years; at 21 years, papilledema, as a result of pseudotumor cerebri, with normal venous MRI angiogram was noted; abdominal CT showed large ovaries with suspicion of multiple cysts; severe mental retardation; broad-based walk with kyphotic posture; normal muscle tone and deep tendon reflexes; dysmetria and intention tremor; distal phalangeal hypoplasia with small tapering nails, pointed distal digits, short distal phalanges and absent middle phalanx on the left second digit; normal brain MRI; abnormal coagulation factors: prothrombin time 11.4 sec (9.2-11.8), partial thromboplastin time 40.1 sec (20.6-32.9), antithrombin III 28 U/dl (88-131), Factor XI total 12.2 U/dl (52-120), protein C 24 U/dl (70-140), and protein S 42.2 U/dl (70-134); low LDL cholesterol of 44 mg/dl (62-136) but normal HDL cholesterol of 47 mg/dl (37-68); diagnosis confirmed using carbohydrate deficient transferrin analysis by electrospray ionization mass spectrometry; normal activities of phosphomannomutase, phosphomannose isomerase; donor subject is a compound heterozygote: one allele has a three base deletion in exon 9 of the ALG6 gene [897-899delAAT] that causes the loss of I299 and a second allele has an intronic mutation in intron 7 of the ALG6 gene [IVS7+2T>G] that disrupts splicing and causes skipping of exons 7-12 plus 22 bases of exon 13.

Characterizations

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IDENTIFICATION OF SPECIES OF ORIGIN Species of Origin confirmed by LINE assay
 
Gene ALG6
Chromosomal Location 1p22.3
Allelic Variant 1 delI299; CONGENITAL DISORDER OF GLYCOSYLATION; TYPE Ic
Identified Mutation 897_899delAAT
 
Gene ALG6
Chromosomal Location 1p22.3
Allelic Variant 2 skipped ex 7-12 plus 22 bps of ex 13; CONGENITAL DISORDER OF GLYCOSYLATION; TYPE Ic
Identified Mutation IVS7+2T>G

Phenotypic Data

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Remarks Clinically affected; decreased fetal movements during pregnancy; birth weight = 3,500 g; spells of cyanosis and apnea during feeding in first 2 weeks of life; radiological evaluation showed bilateral reduction deformities of distal phalanges of digits II to IV in both hands and absence of the mid and distal phalanges on digits II to IV in the feet; right great toe has reduction of proximal phalanx and absence of distal phalanx; sat at 15 months, cruised at 3 years, walked independently at 5 years, first words at 5 years; 2 episodes of generalized epilepsy at age 20 months with normal EEG; grand mal seizures at ages 9 and 12 years; menarche at 15 years; irregular menses treated with medroxyprogesterone but followed by development of hirsutism; switched to triphasic contraceptive but excessive weight gain continued and male pattern frontal balding developed; pronounced virilization; deep vein thrombosis of left superficial femoral and deep popliteal vein developed at age 19 years; at 21 years, papilledema, as a result of pseudotumor cerebri, with normal venous MRI angiogram was noted; abdominal CT showed large ovaries with suspicion of multiple cysts; severe mental retardation; broad-based walk with kyphotic posture; normal muscle tone and deep tendon reflexes; dysmetria and intention tremor; distal phalangeal hypoplasia with small tapering nails, pointed distal digits, short distal phalanges and absent middle phalanx on the left second digit; normal brain MRI; abnormal coagulation factors: prothrombin time 11.4 sec (9.2-11.8), partial thromboplastin time 40.1 sec (20.6-32.9), antithrombin III 28 U/dl (88-131), Factor XI total 12.2 U/dl (52-120), protein C 24 U/dl (70-140), and protein S 42.2 U/dl (70-134); low LDL cholesterol of 44 mg/dl (62-136) but normal HDL cholesterol of 47 mg/dl (37-68); diagnosis confirmed using carbohydrate deficient transferrin analysis by electrospray ionization mass spectrometry; normal activities of phosphomannomutase, phosphomannose isomerase; donor subject is a compound heterozygote: one allele has a three base deletion in exon 9 of the ALG6 gene [897-899delAAT] that causes the loss of I299 and a second allele has an intronic mutation in intron 7 of the ALG6 gene [IVS7+2T>G] that disrupts splicing and causes skipping of exons 7-12 plus 22 bases of exon 13.

Publications

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Sun L, Eklund EA, Van Hove JL, Freeze HH, Thomas JA, Clinical and molecular characterization of the first adult congenital disorder of glycosylation (CDG) type Ic patient American journal of medical genetics Part A137:22-6 2005
PubMed ID: 16007612

External Links

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Gene Cards ALG6
Gene Ontology GO:0004576 oligosaccharyl transferase activity
GO:0005783 endoplasmic reticulum
GO:0006487 N-linked glycosylation
GO:0016021 integral to membrane
GO:0016757 transferase activity, transferring glycosyl groups
NCBI Gene Gene ID:29929
NCBI GTR 603147 CONGENITAL DISORDER OF GLYCOSYLATION, TYPE Ic; CDG1C
604566 ALG6 ALPHA-1,3-GLUCOSYLTRANSFERASE; ALG6
OMIM 603147 CONGENITAL DISORDER OF GLYCOSYLATION, TYPE Ic; CDG1C
604566 ALG6 ALPHA-1,3-GLUCOSYLTRANSFERASE; ALG6
Omim Description CARBOHYDRATE-DEFICIENT GLYCOPROTEIN SYNDROME, TYPE I, WITH DEFICIENTGLYCOSYLATION OF DOLICHOL-LINKED OLIGOSACCHARIDE
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U.S. Academic/Non-profit/Government:
$139.00USD
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