Abnormal concentrations of acetylated amino acids in cerebrospinal fluid in acetyl‐CoA transporter deficiency

Acetyl‐CoA transporter 1 (AT‐1) is a transmembrane protein which regulates influx of acetyl‐CoA from the cytosol to the lumen of the endoplasmic reticulum and is therefore important for the posttranslational modification of numerous proteins. Pathological variants in the SLC33A1 gene coding for AT‐1...

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Veröffentlicht in:Journal of inherited metabolic disease 2022-11, Vol.45 (6), p.1048-1058
Hauptverfasser: Šikić, Katarina, Peters, Tessa M. A., Marušić, Eugenija, Čagalj, Ivana Čulo, Ramadža, Danijela Petković, Žigman, Tamara, Fumić, Ksenija, Fernandez, Esperanza, Gevaert, Kris, Debeljak, Željko, Wevers, Ron A., Barić, Ivo
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container_end_page 1058
container_issue 6
container_start_page 1048
container_title Journal of inherited metabolic disease
container_volume 45
creator Šikić, Katarina
Peters, Tessa M. A.
Marušić, Eugenija
Čagalj, Ivana Čulo
Ramadža, Danijela Petković
Žigman, Tamara
Fumić, Ksenija
Fernandez, Esperanza
Gevaert, Kris
Debeljak, Željko
Wevers, Ron A.
Barić, Ivo
description Acetyl‐CoA transporter 1 (AT‐1) is a transmembrane protein which regulates influx of acetyl‐CoA from the cytosol to the lumen of the endoplasmic reticulum and is therefore important for the posttranslational modification of numerous proteins. Pathological variants in the SLC33A1 gene coding for AT‐1 have been linked to a disorder called Huppke‐Brendel syndrome, which is characterized by congenital cataracts, hearing loss, severe developmental delay and early death. It has been described in eight patients so far, who all had the abovementioned symptoms together with low serum copper and ceruloplasmin concentrations. The link between AT‐1 and low ceruloplasmin concentrations is not clear, nor is the complex pathogenesis of the disease. Here we describe a further case of Huppke‐Brendel syndrome with a novel and truncating homozygous gene variant and provide novel biochemical data on N‐acetylated amino acids in cerebrospinal fluid (CSF) and plasma. Our results indicate that decreased levels of many N‐acetylated amino acids in CSF are a typical metabolic fingerprint for AT‐1 deficiency and are potential biomarkers for the defect. As acetyl‐CoA is an important substrate for protein acetylation, we performed N‐terminal proteomics, but found only minor effects on this particular protein modification. The acetyl‐CoA content in patient's fibroblasts was insignificantly decreased. Our data may help to better understand the mechanisms underlying the metabolic disturbances, the pathophysiology and the clinical phenotype of the disease.
doi_str_mv 10.1002/jimd.12549
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As acetyl‐CoA is an important substrate for protein acetylation, we performed N‐terminal proteomics, but found only minor effects on this particular protein modification. The acetyl‐CoA content in patient's fibroblasts was insignificantly decreased. Our data may help to better understand the mechanisms underlying the metabolic disturbances, the pathophysiology and the clinical phenotype of the disease.</abstract><cop>Hoboken, USA</cop><pub>John Wiley &amp; Sons, Inc</pub><pmid>35999711</pmid><doi>10.1002/jimd.12549</doi><tpages>11</tpages><orcidid>https://orcid.org/0000-0002-1799-3980</orcidid></addata></record>
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subjects Acetyl Coenzyme A - metabolism
acetylated amino acids
Acetylation
acetyl‐CoA transporter
Amino acids
Amino Acids - metabolism
biomarkers
Cataracts
Cerebrospinal fluid
Ceruloplasmin
Ceruloplasmin - metabolism
copper
Cytosol
Endoplasmic reticulum
Endoplasmic Reticulum - metabolism
Fibroblasts
Hearing loss
Humans
Huppke‐Brendel syndrome
Metabolism
Patients
Phenotypes
protein acetylation
Proteins
Proteomics
SLC33A1 gene
Syndrome
title Abnormal concentrations of acetylated amino acids in cerebrospinal fluid in acetyl‐CoA transporter deficiency
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