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  1. Article: Homocysteine and methylmalonic acid in Phenylketonuria patients.

    Hoss, Giovana Regina Weber / Sperb-Ludwig, Fernanda / Tonon, Tássia / Poloni, Soraia / Behringer, Sidney / Blom, Henk J / Maillot, François / Schwartz, Ida Vanessa Doederlein

    Genetics and molecular biology

    2024  Volume 46, Issue 3 Suppl 1, Page(s) e20230103

    Abstract: Hyperhomocysteinemia and vitamin B12 deficiency have been reported in patients with phenylketonuria. In this study, total homocysteine (tHcy) and methylmalonic acid (MMA) levels were analyzed in samples from 25 phenylketonuria (PKU) patients. Comparisons ...

    Abstract Hyperhomocysteinemia and vitamin B12 deficiency have been reported in patients with phenylketonuria. In this study, total homocysteine (tHcy) and methylmalonic acid (MMA) levels were analyzed in samples from 25 phenylketonuria (PKU) patients. Comparisons were made between pre- and post-treatment values (n= 3); on treatment values, between periods with high and normal/low phenylalanine (Phe) levels (n= 20); and in women before, during and after pregnancy (n= 3). THcy levels decreased after treating PKU with metabolic formula (p=0.014). Except for a pregnant woman before pregnancy, none of the patients had tHcy values above the normal range. In fact, tHcy was < 5 μmol/L in 34% of the samples. We observed a decrease in Phe, tHcy, and tyrosine levels during pregnancy. MMA levels did not differ significantly, with values remaining in the normal range. These data indicate that there was no B12 deficiency in patients who adhere to the diet. In conclusion, in PKU patients treated with metabolic formula, tHcy is frequently not elevated, remaining even in the lower normal range in some patients. Thus, clinical follow-up and adherence to dietary treatment are crucial to prevent B12 deficiency.
    Language English
    Publishing date 2024-04-05
    Publishing country Brazil
    Document type Journal Article
    ZDB-ID 1445712-x
    ISSN 1678-4685 ; 1415-4757
    ISSN (online) 1678-4685
    ISSN 1415-4757
    DOI 10.1590/1678-4685-GMB-2023-0103
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: In vitro substrate reduction, chaperone and immunomodulation treatments reduce heparan sulfate in mucolipidosis III human fibroblasts.

    Sperb-Ludwig, Fernanda / Ludwig, Nataniel Floriano / Rizowy, Gustavo Mottin / Velho, Renata Voltolini / Schwartz, Ida Vanessa Doederlein

    Genetics and molecular biology

    2023  Volume 46, Issue 3 Suppl 1, Page(s) e20230117

    Abstract: Mucolipidosis II and III (MLII and MLIII) are autosomal recessive diseases caused by pathogenic variants in GNPTAB and GNPTG genes that lead to defects in GlcNAc-1-phosphotransferase. This enzyme adds mannose 6-phosphate residues to lysosomal hydrolases, ...

    Abstract Mucolipidosis II and III (MLII and MLIII) are autosomal recessive diseases caused by pathogenic variants in GNPTAB and GNPTG genes that lead to defects in GlcNAc-1-phosphotransferase. This enzyme adds mannose 6-phosphate residues to lysosomal hydrolases, which allows enzymes to enter lysosomes. Defective GlcNAc-1-phosphotransferase causes substrate accumulation and inflammation. These diseases have no treatment, and we hypothesized that the use of substrate reduction therapy and immunomodulation may be beneficial at the cell level and as a future therapeutic approach. Fibroblasts from two patients with MLIII alpha/beta and 2 patients with MLIII gamma as well as from one healthy control were treated with 10 µM miglustat, 20 µM genistein, and 20 µM thalidomide independently. ELISA assay and confocal immunofluorescence microscopy were used to evaluate the presence of heparan sulfate (HS) and the impact on substrate accumulation. ELISA assay showed HS reduction in all patients with the different treatments used (p=0.05). HS reduction was also observed by immunofluorescence microscopy. Our study produced encouraging results, since the reduction in substrate accumulation, even partial, may offer benefits to the phenotype of patients with inborn errors of metabolism.
    Language English
    Publishing date 2023-12-04
    Publishing country Brazil
    Document type Journal Article
    ZDB-ID 1445712-x
    ISSN 1678-4685 ; 1415-4757
    ISSN (online) 1678-4685
    ISSN 1415-4757
    DOI 10.1590/1678-4685-GMB-2023-0117
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Epidemiological aspects of hereditary fructose intolerance: A database study.

    Pinheiro, Franciele C / Sperb-Ludwig, Fernanda / Schwartz, Ida V D

    Human mutation

    2021  Volume 42, Issue 12, Page(s) 1548–1566

    Abstract: Hereditary fructose intolerance (HFI) is an inborn error of fructose metabolism of autosomal recessive inheritance caused by pathogenic variants in the ALDOB gene that lead to aldolase B deficiency in the liver, kidneys, and intestine. Patients manifest ... ...

    Abstract Hereditary fructose intolerance (HFI) is an inborn error of fructose metabolism of autosomal recessive inheritance caused by pathogenic variants in the ALDOB gene that lead to aldolase B deficiency in the liver, kidneys, and intestine. Patients manifest symptoms, such as ketotic hypoglycemia, vomiting, nausea, in addition to hepatomegaly and other liver and kidney dysfunctions. The treatment consists of a fructose-restricted diet, which results in a good prognosis. To analyze the distribution of ALDOB variants described in patients and to estimate the prevalence of HFI based on carrier frequency in the gnomAD database, a systematic review was conducted to assess ALDOB gene variants among patients with HFI. The prevalence of HFI was estimated from the carrier frequency of variants described in patients, as well as rare variants predicted as pathogenic by in silico tools. The p.(Ala150Pro) and p.(Ala175Asp) variants are the most frequent and are distributed worldwide. However, these variants have particular distribution patterns in Europe. The analysis of the prevalence of HFI showed that the inclusion of rare alleles predicted as pathogenic is a more informative approach for populations with few patients. The data show that HFI has a wide distribution and an estimated prevalence of ~1:10,000.
    MeSH term(s) Alleles ; Fructose Intolerance/diagnosis ; Fructose Intolerance/epidemiology ; Fructose Intolerance/genetics ; Fructose-Bisphosphate Aldolase/genetics ; Humans ; Liver/pathology ; Mutation
    Chemical Substances Fructose-Bisphosphate Aldolase (EC 4.1.2.13)
    Language English
    Publishing date 2021-09-24
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Systematic Review
    ZDB-ID 1126646-6
    ISSN 1098-1004 ; 1059-7794
    ISSN (online) 1098-1004
    ISSN 1059-7794
    DOI 10.1002/humu.24282
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  4. Article: Characterization of the 3'UTR of the BTD gene and identification of regulatory elements and microRNAs.

    Silva, Gerda Cristal Villalba / Borsatto, Taciane / Schwartz, Ida Vanessa Doederlein / Sperb-Ludwig, Fernanda

    Genetics and molecular biology

    2022  Volume 45, Issue 1, Page(s) e20200432

    Abstract: Reduced biotinidase activity is associated with a spectrum of deficiency ranging from total deficiency to heterozygous levels, a finding that is not always explained by the pathogenic variants observed in the BTD gene. The investigation of miRNAs, ... ...

    Abstract Reduced biotinidase activity is associated with a spectrum of deficiency ranging from total deficiency to heterozygous levels, a finding that is not always explained by the pathogenic variants observed in the BTD gene. The investigation of miRNAs, regulatory elements and variants in the 3'UTR region may present relevance in understanding the genotype-phenotype association. The aims of the study were to characterize the regulatory elements of the 3'UTR of the BTD gene and identify variants and miRNAs which may explain the discrepancies observed between genotype and biochemical phenotype. We evaluated 92 individuals with reduced biotinidase activity (level of heterozygotes = 33, borderline = 35, partial DB = 20 or total DB= 4) with previously determined BTD genotype. The 3'UTR of the BTD gene was Sanger sequenced. In silico analysis was performed to identify miRNAs and regulatory elements. No variants were found in the 3'UTR. We found 97 possible miRNAs associated with the BTD gene, 49 predicted miRNAs involved in the alanine, biotin, citrate and pyruvate metabolic pathways and 5 genes involved in biotin metabolism. Six AU-rich elements were found. Our data suggest variants in the 3'UTR of BTD do not explain the genotype-phenotype discrepancies found in Brazilian individuals with reduced biotinidase.
    Language English
    Publishing date 2022-02-14
    Publishing country Brazil
    Document type Journal Article
    ZDB-ID 1445712-x
    ISSN 1678-4685 ; 1415-4757
    ISSN (online) 1678-4685
    ISSN 1415-4757
    DOI 10.1590/1678-4685-GMB-2020-0432
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Glycogen Storage Disease: Expert Opinion on Clinical Diagnosis Revisited after Molecular Testing.

    de Marchi, Rafael / Nalin, Tatiele / Sperb-Ludwig, Fernanda / Pinheiro, Franciele Cabral / Schwartz, Ida Vanessa Doederlein / Steiner, Carlos Eduardo

    Genes

    2023  Volume 14, Issue 12

    Abstract: This study sought to analyze whether an accurate diagnosis of the type and subtype of hepatic Glycogen Storage Diseases (GSDs) could be performed based on general clinical and biochemical aspects via comparing the proposed diagnostic hypotheses with the ... ...

    Abstract This study sought to analyze whether an accurate diagnosis of the type and subtype of hepatic Glycogen Storage Diseases (GSDs) could be performed based on general clinical and biochemical aspects via comparing the proposed diagnostic hypotheses with the molecular results. Twelve physicians with experience in hepatic GSDs reviewed 45 real cases comprising a standardized summary of clinical and laboratory data. There was no relation between the hit rate and the time since graduation, the time of experience in GSD, and the number of patients treated during their careers. The average assertiveness was 47%, with GSD Ia and Ib being the best-identified types, while no expert correctly identified GSD IXc. Underage investigation for later manifestations, incomplete clinical description, and complementary analysis, the overvaluation of a specific clinical finding ("false positive") or the discarding of the diagnosis in the absence of it ("false negative"), as well as the lack of knowledge of the rarest GSD types, may have impacted the accuracy of the assessment. This study emphasized that characteristics considered as determinants in identifying the specific types or subtypes of GSD are not exclusive, thus becoming factors that may have induced the evaluators to misdiagnose.
    MeSH term(s) Humans ; Expert Testimony ; Glycogen Storage Disease/diagnosis ; Glycogen Storage Disease/genetics ; Glycogen Storage Disease Type I/diagnosis ; Molecular Diagnostic Techniques
    Language English
    Publishing date 2023-12-15
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527218-4
    ISSN 2073-4425 ; 2073-4425
    ISSN (online) 2073-4425
    ISSN 2073-4425
    DOI 10.3390/genes14122219
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: KHK inhibition for the treatment of hereditary fructose intolerance and nonalcoholic fatty liver disease: a double-edged sword.

    Pinheiro, Franciele Cabral / Sperb-Ludwig, Fernanda / Schwartz, Ida Vanessa Doederlein

    Cellular and molecular life sciences : CMLS

    2020  Volume 77, Issue 17, Page(s) 3465–3466

    MeSH term(s) Fructose ; Fructose Intolerance ; Humans ; Non-alcoholic Fatty Liver Disease
    Chemical Substances Fructose (30237-26-4)
    Language English
    Publishing date 2020-06-26
    Publishing country Switzerland
    Document type Journal Article ; Comment
    ZDB-ID 1358415-7
    ISSN 1420-9071 ; 1420-682X
    ISSN (online) 1420-9071
    ISSN 1420-682X
    DOI 10.1007/s00018-020-03575-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Classical homocystinuria: A common inborn error of metabolism? An epidemiological study based on genetic databases.

    Weber Hoss, Giovana R / Sperb-Ludwig, Fernanda / Schwartz, Ida V D / Blom, Henk J

    Molecular genetics & genomic medicine

    2020  Volume 8, Issue 6, Page(s) e1214

    Abstract: Background: Biallelic pathogenic variants in CBS gene cause the most common form of homocystinuria, the classical homocystinuria (HCU). The worldwide prevalence of HCU is estimated to be 0.82:100,000 [95% CI, 0.39-1.73:100,000] according to clinical ... ...

    Abstract Background: Biallelic pathogenic variants in CBS gene cause the most common form of homocystinuria, the classical homocystinuria (HCU). The worldwide prevalence of HCU is estimated to be 0.82:100,000 [95% CI, 0.39-1.73:100,000] according to clinical records and 1.09:100,000 [95% CI, 0.34-3.55:100,000] by neonatal screening. In this study, we aimed to estimate the minimal worldwide incidence of HCU.
    Methods: The 25 most common pathogenic alleles of HCU were identified through a literature review. The incidence of HCU was estimated based on the frequency of these common pathogenic alleles in a large genomic database (gnomAD).
    Results: The minimum worldwide incidence of HCU was estimated to be ~0.38:100,000, and the incidence was higher in Europeans non-Finnish (~0.72:100,000) and Latin Americans (~0.45:100,000) and lower in Africans (~0.20:100,000) and Asians (~0.02:100,000).
    Conclusion: Our data are in accordance with the only published metanalysis on this topic. To our surprise, the observed incidence of HCU in Europeans was much lower than those described in articles exploring small populations from northern Europe but was similar to the incidence described on the basis of neonatal screening programs. In our opinion, this large dataset analyzed and its population coverage gave us greater precision in the estimation of incidence.
    MeSH term(s) Adult ; Cystathionine beta-Synthase/genetics ; Databases, Genetic/statistics & numerical data ; Europe ; Gene Frequency ; Homocystinuria/epidemiology ; Homocystinuria/ethnology ; Homocystinuria/genetics ; Humans ; Incidence ; Infant, Newborn ; Neonatal Screening
    Chemical Substances Cystathionine beta-Synthase (EC 4.2.1.22)
    Language English
    Publishing date 2020-03-30
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2734884-2
    ISSN 2324-9269 ; 2324-9269
    ISSN (online) 2324-9269
    ISSN 2324-9269
    DOI 10.1002/mgg3.1214
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  8. Article ; Online: Effect of BTD gene variants on in vitro biotinidase activity.

    Borsatto, Taciane / Sperb-Ludwig, Fernanda / Blom, Henk J / Schwartz, Ida V D

    Molecular genetics and metabolism

    2019  Volume 127, Issue 4, Page(s) 361–367

    Abstract: Introduction: Biotinidase deficiency (BD), an autosomal recessive disease, is classified into profound (activity ... C (p.Asp444His), which is associated ... ...

    Abstract Introduction: Biotinidase deficiency (BD), an autosomal recessive disease, is classified into profound (activity <10%) or partial BD (activity 10-30%). The most frequent variant in patients worldwide is c.1330G > C (p.Asp444His), which is associated with partial BD. In vivo studies indicate that this variant reduces the biotinidase activity by 50%. The objective of this study was to evaluate the in vitro effect of p.Asp444His and of five novel variants identified among Brazilian individuals showing low activity of biotinidase in serum.
    Methods: The variants c.119 T > C (p.Leu40Pro), c.479G > A (p.Cys160Tyr), c.664G > A (p.Asp222Asn), c.1330G > C (p.Asp444His), c.1337 T > C (p.Leu446Pro), c.1466A > G (p.Asn489Ser) and the wild type (wt) BTD gene were expressed in HEK 293 cells. Biotinidase activity was quantified by colorimetric method in cells homogenates and culture medium. The wtBTD activity was considered 100%.
    Results: The p.Leu40Pro, p.Cys160Tyr and p.Leu446Pro variants were associated to impaired biotinidase activity (activity in cells: 33%, 14%, 0%, respectively; activity in medium: 7%, 0.3%, 2%, respectively) and undetectable amount of protein in intra and extracellular space. The p.Asn489Ser variant had these effects restricted to the extracellular space (activity in medium: 43%), and the p.Asp222Asn variant showed normal activity. The expression of p.Asp444His variant resulted in detectable protein and slightly reduced activity only in cells (activity in cells: 46%; activity in medium: 115%).
    Conclusion: Our findings suggest that the p.Leu40Pro, p.Cys160Tyr and p.Leu446Pro variants are deleterious; the p.Asn489Ser is probably related to a mild biochemical phenotype; and p.Asp222Asn variant is probably not deleterious. The p.Asp444His variant seems to code for a protein with variable activity.
    MeSH term(s) Alleles ; Biotinidase/genetics ; Biotinidase/metabolism ; Biotinidase Deficiency/genetics ; Colorimetry ; Gene Expression ; Genetic Variation ; HEK293 Cells ; Humans ; Mutation
    Chemical Substances Biotinidase (EC 3.5.1.12)
    Language English
    Publishing date 2019-07-17
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1418518-0
    ISSN 1096-7206 ; 1096-7192
    ISSN (online) 1096-7206
    ISSN 1096-7192
    DOI 10.1016/j.ymgme.2019.07.006
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Chitotriosidase on treatment-naïve patients with Gaucher disease: A genotype vs phenotype study.

    Sperb-Ludwig, Fernanda / Heineck, Bianca Lúcia / Michelin-Tirelli, Kristiane / Alegra, Taciane / Schwartz, Ida Vanessa Doederlein

    Clinica chimica acta; international journal of clinical chemistry

    2019  Volume 492, Page(s) 1–6

    Abstract: Background: Chitotriosidase (ChT) is used as a biomarker for the follow-up of patients with Gaucher disease (GD), once his activity is extremely elevated and declines during ERT. However, some variants in the CHIT1 gene affect ChT activity.: Methods: ...

    Abstract Background: Chitotriosidase (ChT) is used as a biomarker for the follow-up of patients with Gaucher disease (GD), once his activity is extremely elevated and declines during ERT. However, some variants in the CHIT1 gene affect ChT activity.
    Methods: To assess association between ChT genotype, and clinical/biochemical features of GD were performed CHIT1 genotyping for: c.1049_1072dup24, p.Gly102Ser, p.Gly354Arg, c.1155_1156 + 2delGAGT, c.1156 + 5_1156 + 8delGTAA, p.Ala442Val/Gly and the rearrangement delE/I-10.
    Results: Were evaluated 42 patients with GD from Southern Brazil. Pretreatment ChT activity was available for 32 patients. Allelic frequencies found for dup24, p.Gly102Ser and p.Ala442Gly were 0.14, 0.32 and 0.12, respectively. Only one patient presented reduced ChT activity (dup24 homozygous). Comparison between wild homozygous and heterozygous for dup24 showed that both differ in relation to the ChT activity before (15,230 vs 6936 nmol/h/mL, p < .001), but not after treatment (5212 vs 3045 nmol/h/mL, p = .227).
    Conclusions: Pretreatment ChT activity was not correlated with clinical/biochemical features. There was a reduction of 63% in the ChT activity after 12 months on treatment (p < .001). There is no evidence that higher ChT levels are associated with a more severe symptomatology in untreated GD patients. The pretreatment ChT levels appear to be mainly dependent on the presence/absence of the dup24 allele.
    MeSH term(s) Adolescent ; Adult ; Aged ; Child ; Child, Preschool ; Female ; Gaucher Disease/enzymology ; Gaucher Disease/genetics ; Gene Frequency ; Genotype ; Hexosaminidases/genetics ; Humans ; Male ; Middle Aged ; Phenotype ; Young Adult
    Chemical Substances Hexosaminidases (EC 3.2.1.-) ; chitotriosidase (EC 3.2.1.-)
    Language English
    Publishing date 2019-01-26
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 80228-1
    ISSN 1873-3492 ; 0009-8981
    ISSN (online) 1873-3492
    ISSN 0009-8981
    DOI 10.1016/j.cca.2019.01.018
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  10. Article: The rs2229611 (

    Pinheiro, Franciele Cabral / Sperb-Ludwig, Fernanda / Fagundes Verch, Juliana Maria / Dos Santos, Bruna Bento / de Souza, Carolina Fischinger Moura / Schwartz, Ida Vanessa Doederlein

    Molecular genetics and metabolism reports

    2020  Volume 25, Page(s) 100659

    Abstract: The rs2229611 SNP ( ...

    Abstract The rs2229611 SNP (
    Language English
    Publishing date 2020-10-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2821908-9
    ISSN 2214-4269
    ISSN 2214-4269
    DOI 10.1016/j.ymgmr.2020.100659
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