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Fistrek Prlic M, Coric M, Calabresi L, Pavanello C, Mosca L, Cavallari U, Vukovic Brinar I, Karanovic S, Laganovic M, Jelakovic B. Two novel variants in the lecithin:cholesterol acyltransferase gene resulted in classic LCAT deficiency. ATHEROSCLEROSIS PLUS 2022; 49:28-31. [PMID: 36644204 PMCID: PMC9833264 DOI: 10.1016/j.athplu.2022.05.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 05/27/2022] [Accepted: 05/30/2022] [Indexed: 01/18/2023]
Abstract
Background and aims We report the first two cases of familial lecithin:cholesterol acyltransferase (LCAT) deficiency in Croatia with classical clinical and biochemical features. Patients and methods A 30-year-old man with nephrotic syndrome, corneal opacities, hepatosplenomegaly, anemia, low high-density lipoprotein (HDL)-cholesterol levels and arterial hypertension (blood pressure >200/100 mmHg) was admitted to our department. At admission, he had an elevated creatinine serum level (233 μmol/L), proteinuria of 12 g in 24-h urine (g/24 h), 3-7 erythrocytes in urine sediment and notable anemia (hemoglobin level 90 g/l). His HDL-cholesterol was significantly low (0.42 mmol/L). Besides chronic kidney disease (CKD), other secondary causes of hypertension were ruled out. The patient was previously diagnosed with membranous nephropathy and treated unsuccessfully with immunosuppressive agents (steroids, cyclosporine, cyclophosphamide). Re-evaluation of histopathological findings of kidney biopsy revealed massive deposition of lipid material in the glomerular basal membrane and in the mesangial region. His 4-year younger brother was also evaluated due to corneal opacities and new-onset arterial hypertension. Nephrotic range proteinuria with preserved global renal function was determined. He also had very low HDL-cholesterol levels. Results Kidney biopsies from both patients were consistent with LCAT deficiency. The disease was confirmed by measurement of LCAT enzyme activity, plasma cholesterol esterification rate, and genetic testing. Two novel missense variants in the LCAT gene (c.496G > A and c.1138T > C) were found. Conclusions To our knowledge, the presented cases are the first reported cases of genetic LCAT deficiency in Croatia. Given the clinical presentation, the complete lack of LCAT activity and cholesterol esterification rate, diagnosis of familial LCAT deficiency was made.
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Affiliation(s)
- Margareta Fistrek Prlic
- Department of Nephrology, Arterial Hypertension, Dialysis and Transplantation, University Hospital Center Zagreb, University of Zagreb, School of Medicine, Kispaticeva 12, 10000, Zagreb, Croatia,Corresponding author. Department of Nephrology, Arterial Hypertension, Dialysis and Transplantation, UHC Zagreb, Kispaticeva ulica 12, 10000, Zagreb, Croatia.
| | - Marijana Coric
- Department of Pathology, University Hospital Center Zagreb, University of Zagreb, School of Medicine, Kispaticeva 12, 10000, Zagreb, Croatia
| | - Laura Calabresi
- Center E. Grossi Paoletti, Department of Pharmacology, University of Milan, Via Balzaretti 9, 20133, Milan, Italy
| | - Chiara Pavanello
- Center E. Grossi Paoletti, Department of Pharmacology, University of Milan, Via Balzaretti 9, 20133, Milan, Italy
| | - Lorena Mosca
- Medical Genetics Unit, Department of Services, ASST Grande Ospedale Metropolitano Niguarda, Piazza Ospedale Maggiore 3, 20162, Milan, Italy
| | - Ugo Cavallari
- Medical Genetics Unit, Department of Services, ASST Grande Ospedale Metropolitano Niguarda, Piazza Ospedale Maggiore 3, 20162, Milan, Italy
| | - Ivana Vukovic Brinar
- Department of Nephrology, Arterial Hypertension, Dialysis and Transplantation, University Hospital Center Zagreb, University of Zagreb, School of Medicine, Kispaticeva 12, 10000, Zagreb, Croatia
| | - Sandra Karanovic
- Department of Nephrology, Arterial Hypertension, Dialysis and Transplantation, University Hospital Center Zagreb, University of Zagreb, School of Medicine, Kispaticeva 12, 10000, Zagreb, Croatia
| | - Mario Laganovic
- Department of Nephrology, Arterial Hypertension, Dialysis and Transplantation, University Hospital Center Zagreb, University of Zagreb, School of Medicine, Kispaticeva 12, 10000, Zagreb, Croatia,Department of Nephrology, University Hospital Merkur, University of Zagreb, School of Medicine, Zajceva 19, 10000, Zagreb, Croatia
| | - Bojan Jelakovic
- Department of Nephrology, Arterial Hypertension, Dialysis and Transplantation, University Hospital Center Zagreb, University of Zagreb, School of Medicine, Kispaticeva 12, 10000, Zagreb, Croatia
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Vitali C, Bajaj A, Nguyen C, Schnall J, Chen J, Stylianou K, Rader DJ, Cuchel M. A systematic review of the natural history and biomarkers of primary Lecithin:Cholesterol Acyltransferase (LCAT) deficiency. J Lipid Res 2022; 63:100169. [PMID: 35065092 PMCID: PMC8953693 DOI: 10.1016/j.jlr.2022.100169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 12/16/2021] [Accepted: 12/28/2021] [Indexed: 10/31/2022] Open
Abstract
Syndromes associated with LCAT deficiency, a rare autosomal recessive condition, include fish-eye disease (FED) and familial LCAT deficiency (FLD). FLD is more severe and characterized by early and progressive chronic kidney disease (CKD). No treatment is currently available for FLD, but novel therapeutics are under development. Furthermore, although biomarkers of LCAT deficiency have been identified, their suitability to monitor disease progression and therapeutic efficacy is unclear, as little data exist on the rate of progression of renal disease. Here, we systematically review observational studies of FLD, FED, and heterozygous subjects, which summarize available evidence on the natural history and biomarkers of LCAT deficiency, in order to guide the development of novel therapeutics. We identified 146 FLD and 53 FED patients from 219 publications, showing that both syndromes are characterized by early corneal opacity and markedly reduced HDL-C levels. Proteinuria/hematuria were the first signs of renal impairment in FLD, followed by rapid decline of renal function. Furthermore, LCAT activity toward endogenous substrates and the percentage of circulating esterified cholesterol (EC%) were the best discriminators between these two syndromes. In FLD, higher levels of total, non-HDL, and unesterified cholesterol were associated with severe CKD. We reveal a nonlinear association between LCAT activity and EC% levels, in which subnormal levels of LCAT activity were associated with normal EC%. This review provides the first step toward the identification of disease biomarkers to be used in clinical trials and suggests that restoring LCAT activity to subnormal levels may be sufficient to prevent renal disease progression.
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Rosset J, Wang J, Wolfe BM, Dolphin PJ, Hegele RA. Lecithin:cholesterol acyl transferase G30S: association with atherosclerosis, hypoalphalipoproteinemia and reduced in vivo enzyme activity. Clin Biochem 2001; 34:381-6. [PMID: 11522275 DOI: 10.1016/s0009-9120(01)00231-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES A 69 yr old male was referred for assessment of a very low plasma HDL cholesterol and apolipoprotein AI concentration. At age 65, he had undergone triple vessel coronary bypass graft surgery. He had a strong family history of early coronary heart disease. We analyzed the molecular basis of his clinical and biochemical abnormalities. DESIGN AND METHODS We used DNA sequencing to determine whether mutations in LCAT were present. We also evaluated plasma biochemistry and LCAT activity. RESULTS DNA sequencing revealed that the patient was a heterozygote for the G30S mutation in the gene encoding lecithin:cholesteol acyl transferase (LCAT). His plasma was found to have half-normal LCAT activity. CONCLUSIONS The findings in this patient suggest that rare dysfunctional mutations in candidate genes, such as LCAT, can contribute to the spectrum of patients ascertained because of low HDL cholesterol.
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Affiliation(s)
- J Rosset
- The John P. Robarts Research Institute and Department of Medicine, University of Western Ontario, London, Ontario, Canada
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Funke H, von Eckardstein A, Pritchard PH, Hornby AE, Wiebusch H, Motti C, Hayden MR, Dachet C, Jacotot B, Gerdes U. Genetic and phenotypic heterogeneity in familial lecithin: cholesterol acyltransferase (LCAT) deficiency. Six newly identified defective alleles further contribute to the structural heterogeneity in this disease. J Clin Invest 1993; 91:677-83. [PMID: 8432868 PMCID: PMC288009 DOI: 10.1172/jci116248] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The presence of lecithin:cholesterol acyltransferase (LCAT) deficiency in six probands from five families originating from four different countries was confirmed by the absence or near absence of LCAT activity. Also, other invariate symptoms of LCAT deficiency, a significant increase of unesterified cholesterol in plasma lipoproteins and the reduction of plasma HDL-cholesterol to levels below one-tenth of normal, were present in all probands. In the probands from two families, no mass was detectable, while in others reduced amounts of LCAT mass indicated the presence of a functionally inactive protein. Sequence analysis identified homozygous missense or nonsense mutations in four probands. Two probands from one family both were found to be compound heterozygotes for a missense mutation and for a single base insertion causing a reading frame-shift. Subsequent family analyses were carried out using mutagenic primers for carrier identification. LCAT activity and LCAT mass in 23 genotypic heterozygotes were approximately half normal and clearly distinct from those of 20 unaffected family members. In the homozygous patients no obvious relationship between residual LCAT activity and the clinical phenotype was seen. The observation that the molecular defects in LCAT deficiency are dispersed in different regions of the enzyme suggests the existence of several functionally important structural domains in this enzyme.
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Affiliation(s)
- H Funke
- Department of Clinical Chemistry, University of Münster, Federal Republic of Germany
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Habib R, Dommergues JP, Gubler MC, Hadchouel M, Gautier M, Odievre M, Alagille D. Glomerular mesangiolipidosis in Alagille syndrome (arteriohepatic dysplasia). Pediatr Nephrol 1987; 1:455-64. [PMID: 3153318 DOI: 10.1007/bf00849254] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Alagille syndrome is characterized by the association of chronic cholestasis with a paucity of interlobular bile ducts and a distinctive facies together with cardiovascular, skeletal and eye abnormalities. We examined the kidneys of 26 patients with this syndrome; 22 were under 3 years of age and 4 were 4, 6, 12 and 17 years old, respectively. Eighteen showed glomerular lesions of variable severity characterized by a mesangiolipidosis. In the 8 lesser affected patients light microscopy (LM) disclosed a fibrillar appearance of the mesangium, and electron microscopy (EM) showed lipid vacuoles widespread in the mesangial matrix. In the 10 patients who were affected to a greater degree LM and EM showed, in addition to the mesangial matrix changes, the presence of mesangial foam cells. Clinical signs of renal involvement were mild in all patients except for one who died from chronic renal failure at 8 months of age. The extent of mesangiolipidosis was not related to age but to the degree of cholestasis, the most severe lesions being observed in patients aged 3, 6, 8, and 14 months. The glomerular lesions observed in Alagille syndrome are strikingly similar to those observed in adults with lecithin-cholesterol acyl transferase deficiency and other conditions characterized by an increase in plasma lipoproteins rich in free cholesterol and in phospholipids. We conclude that glomerular involvement should be added to the characteristic features of Alagille syndrome. Also we found that the lipid deposition in the glomeruli of patients with Alagille syndrome is related to an abnormal lipid metabolism, which is the consequence of severe cholestasis. The most striking feature of our study is the early detection of the glomerular lesions, contrasting with the lack of overt clinical renal disease. Renal failure may be a major complication for patients with this syndrome in adulthood.
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Affiliation(s)
- R Habib
- INSERM U.192, Hôpital Necker, Paris, France
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Azoulay M, Henry I, Tata F, Weil D, Grzeschik KH, Chaves ME, McIntyre N, Williamson R, Humphries SE, Junien C. The structural gene for lecithin:cholesterol acyl transferase (LCAT) maps to 16q22. Ann Hum Genet 1987; 51:129-36. [PMID: 3674753 DOI: 10.1111/j.1469-1809.1987.tb01054.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We have used a cDNA clone for human lecithin:cholesterol acyl transferase (LCAT) and Southern blotting techniques to identify the human LCAT gene in DNA from a series of rodent X human somatic cell hybrids. Our results are compatible with the location of the gene on human chromosome 16, and this has been confirmed using in situ hybridization of the LCAT cDNA to human metaphase chromosomes. These results confirm the earlier studies on LCAT-deficient patients, indicating that the structural gene for LCAT is on human chromosome 16q22.
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Affiliation(s)
- M Azoulay
- Groupe de Recherches de Biologie Prénatale, INSERM U 73, Paris, France
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Hasstedt SJ, Ash KO, Williams RR. A re-examination of major locus hypotheses for high density lipoprotein cholesterol level using 2,170 persons screened in 55 Utah pedigrees. AMERICAN JOURNAL OF MEDICAL GENETICS 1986; 24:57-67. [PMID: 3706413 DOI: 10.1002/ajmg.1320240108] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A dominant major locus (allele frequency of .0025 +/- .0014), resulting in low levels of high density lipoprotein cholesterol (HDL-C), was revealed by likelihood analysis on 2,170 persons in 55 Utah pedigrees. This allele was expressed through HDL-C levels ranging from 20 to 30 mg/dl in seven persons in two pedigrees. Early coronary heart disease was associated with the allele in one pedigree, but not in the other. In the pedigree without associated heart disease, HDL subfractions HDL2 and HDL3 were both low in individuals with the low HDL-C allele. No other major locus determining either high or low levels of HDL-C was identified in our sample. Polygenic heritability as part of the mixed model was estimated as .561 +/- .035.
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Albers JJ, Chen CH, Adolphson J, Sakuma M, Kodama T, Akanuma Y. Familial lecithin-cholesterol acyltransferase deficiency in a Japanese family: evidence for functionally defective enzyme in homozygotes and obligate heterozygotes. Hum Genet 1982; 62:82-5. [PMID: 7152525 DOI: 10.1007/bf00295608] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Lecithin-cholesterol acyltransferase (LCAT) mass and activity were measured in a Japanese family with familial LCAT deficiency. The two LCAT-deficient subjects had LCAT mass approximately 40-46% of normal (2.65 and 2.31 micrograms/ml respectively, as compared with normal levels of 5.76 +/- 0.95 microgram/ml in 19 Japanese subjects) and enzyme activity less than 10% of normal (9.1 and 8.3 nmol/h/ml respectively, as compared with normal levels of 100 nmol/h/ml). All obligate heterozygotes examined, including the father of the two LCAT-deficient subjects, and all five children of the deficient subjects had LCAT mass approximately 72-80% of the normal LCAT mass (4.12, 4.38, 4.45, 4.48, 4.49, 4.61 micrograms/ml, respectively) and LCAT activity approximately half normal (51.9, 52.4, 54.2, 56.6, and 57.2 nmol/h/ml). We conclude that the two LCAT-deficient subjects of this family have functionally defective enzyme. Furthermore, the data suggest that the plasma of the obligate heterozygotes contain both normal and functionally defective enzymes.
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Albers JJ, Chen C, Adolphson JL. Familial lecithin-cholesterol acyltransferase: identification of heterozygotes with half-normal enzyme activity and mass. Hum Genet 1981; 58:306-9. [PMID: 7327552 DOI: 10.1007/bf00294929] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Lecithin-cholesterol acyltransferase (LCAT) mass and activity was measured in Canadian kindred of Italian and Swedish descent with familial LCAT deficiency. Four subjects had LCAT mass of 5.21 +/- 0.87 micrograms/ml (mean +/- SD) and LCAT activity of 98.8 +/- 12.0 nmol/h/ml, well within their respective normal ranges. Five family members, including the parents, the maternal grandmother, and two of four siblings of the LCAT deficient subjects, had enzyme mass (2.85 +/- 0.32 micrograms/ml) and activity (50.8 +/- 6.3 nmol/h/ml) approximately one-half that of normal levels. These presumed heterozygotes had normal levels of apolipoproteins A-I, A-II, B and D. The two subjects with LCAT deficiency had no detectable LCAT mass (below 0.1 microgram/ml) or LCAT activity (below 0.76 nmol/h/ml), apolipoprotein A-I and D levels approximately 50% of normal, and apolipoproteins B and A-II levels only 30-35% of normal. LCAT deficiency in this family is determined by an autosomal recessive mode. Furthermore, LCAT levels and activity are determined by two autosomal codominant alleles, LCATn, the normal LCAT gene, and LCATd, the LCAT deficiency gene.
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