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Clinical report
Detection and molecular diagnosis of a new case of congenital analbuminaemia
Detección y diagnóstico molecular de un nuevo caso de analbuminemia congénita
M. Josefa Cabrejas Núñez, Cristina Izquierdo Álvarez, Emiliano Gónzalez Vioque, Alejandro Almería Lafuente, Ramona Ángeles Silvestre Mardomingo
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Servicio de Bioquímica Clínica, Hospital Universitario Puerta de Hierro-Majadahonda, Madrid, Majadahonda, Spain
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Albumin&#44; protein synthesized in the liver and encoded by the gene <span class="elsevierStyleItalic">ALB</span> &#40;chromosome 4q13&#46;3&#41;&#44; constitutes 60&#8211;65&#37; of total serum proteins and is abundant in extra vascular and transudate spaces&#46; Its main functions include the maintenance of oncotic pressure and the transport of endogenous and exogenous compounds since it has great affinity for small hydrophobic molecules &#40;fatty acids&#44; certain hormones and drugs&#41;&#44; calcium&#44; bilirubin&#44; amino acids&#44; etc&#46;<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1&#44;2</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">The most common causes of hypoalbuminemia are&#58; malnutrition&#44; decreased synthesis &#40;mainly associated with liver disease&#41;&#44; increased catabolism &#40;inflammatory processes&#41;&#44; increased loss&#47;elimination &#40;renal dysfunction&#44; malabsorptive enteropathy&#44; severe burns&#44; etc&#46;&#41; and&#47;or alteration in its distribution between intra- and extra-vascular compartments&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">Congenital analbuminaemia &#40;CAA&#41; &#40;MIM &#35; 616000&#41; is an autosomal recessive disease with an estimated prevalence of less than 1&#47;10<span class="elsevierStyleSup">6</span> associated to defects in the <span class="elsevierStyleItalic">ALB</span> gene which imply the absence or significant decrease in albumin levels&#46; The serum total protein test of these patients has a characteristic electrophoretic pattern &#40;absence of the albumin fraction associated with a significant increase in alpha and beta fractions&#41;&#46; CAA should be confirmed with a genetic study&#46; Carriers of CAA may have albuminemia at the lower limit of normal because the non-mutated allele is expressed normally&#46;<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#44;5</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">Adults with CAA have mild clinical signs &#40;fatigue&#44; low blood pressure&#44; mild oedema and&#44; occasionally&#44; lipodystrophy in the lower limbs&#41;&#46; It is rarely associated with systemic oedema&#44; probably due to the compensatory increase in other plasma proteins &#40;lipoproteins&#44; globulins&#41;&#46; The most common biochemical sign in these patients is hyperlipidaemia&#44; especially hypercholesterolemia&#44; which requires statin treatment&#44; reflecting the important role of albumin in lipid metabolism and transport&#46;<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1&#44;4</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">In contrast to the benign presentation of CAA in adults&#44; high morbidity and&#47;or mortality during foetal and neonatal periods has been described in families with CAA&#44; suggesting that albumin plays an important role in early stages of development&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">Although CAA can be easily diagnosed&#44; so far only about 70 cases have been registered worldwide &#40;Register of Analbuminaemia Cases&#58; 4&#41;&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">In this article&#44; we describe a case of CAA detected in our hospital and that&#44; to date&#44; is the first case described in Spain in which the associated molecular defect has been confirmed&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Methods</span><p id="par0040" class="elsevierStylePara elsevierViewall">Albuminemia was determined by colorimetry &#40;bromocresol green&#44; Advia<span class="elsevierStyleItalic">&#174;</span> 2400 Chemical&#44; Siemens Healthineers&#41; and by nephelometry &#40;Dimension Vista<span class="elsevierStyleItalic">&#174;</span> 1500&#44; Siemens Healthineers&#41;&#46; Electrophoretic protein analysis was performed by capillary electrophoresis &#40;Capillarys&#44; Sebia&#41; and agarose gel electrophoresis &#40;HYDRASYS<span class="elsevierStyleItalic">&#174;</span>&#44; Sebia&#41;&#46; The rest of the biochemical parameters were determined following the usual techniques of our laboratory &#40;Advia<span class="elsevierStyleItalic">&#174;</span> 2400&#44; Immulite&#44; Advia Centauro&#44; Siemens Healthineers&#41;&#46;</p><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Molecular analysis of the <span class="elsevierStyleItalic">ALB</span> gene</span><p id="par0045" class="elsevierStylePara elsevierViewall">The DNA was extracted from a sample of anticoagulated whole blood &#40;K3EDTA&#41; using the Maxwell&#174;-16 System &#40;Maxwell&#174;-16 Blood DNA Purification Kit&#41;&#46; The amplification of the 14 coding exons plus adjacent intronic regions of the ALB gene &#40;NM&#95;000477&#46;6&#41; was done by PCR according to Watkins et al&#46;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> Sanger sequencing was performed by a fluorescent dideoxy chain-termination method on the ABI3130 sequencer &#40;BigDye&#174; Terminator Cycle Sequencing kit&#44; Applied Biosystems&#41;&#46;</p><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Ethical aspects</span><p id="par0050" class="elsevierStylePara elsevierViewall">The patient signed the informed consent and the provisions of the Helsinki declaration were met&#46;</p></span></span></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Patient and results</span><p id="par0055" class="elsevierStylePara elsevierViewall">A 42-year-old woman who went to an internal medicine office for an angiomyolipoma in the right kidney&#46; In preoperative study hypoproteinaemia and hypoalbuminemia of unknown aetiology were observed&#46; The patient had a good general condition&#44; asthenia and slight oedema in lower limbs&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">Regarding laboratory data&#44; the following stand out&#58; hypoproteinaemia &#40;4&#46;7&#8239;g&#47;dl&#59; RV&#58; 6&#8211;8&#8239;g&#47;dl&#41;&#44; hypoalbuminemia &#40;1&#46;6&#8239;g&#47;dl&#59; RV&#58; 3&#46;5&#8211;5&#46;6&#8239;g&#47;dl&#41; and hypercholesterolemia despite being treated with statins&#58; total cholesterol 272&#8239;mg&#47;dl &#40;RV&#58; 150&#8211;200&#8239;mg&#47;dl&#41; and LDL cholesterol &#40;calculated&#41; 175&#8239;mg&#47;dl &#40;RV&#58; 70&#8211;160&#8239;mg&#47;dl&#41;&#59; normal values of HDL cholesterol 72&#8239;mg&#47;dl &#40;RV&#58; 45&#8211;90&#8239;mg&#47;dl&#41; and triglycerides 125&#8239;mg&#47;dl &#40;RV&#58; 30&#8211;200&#8239;mg&#47;dl&#41;&#59; normal liver profile&#58; ALT 30&#8239;U&#47;l &#40;RV&#58; 6&#8211;40&#8239;U&#47;l&#41;&#59; AST 30&#8239;U&#47;l &#40;RV&#58; 6&#8211;40&#8239;U&#47;l&#41;&#44; GGT 27&#8239;U&#47;l &#40;RV&#58; 6&#8211;36&#8239;U&#47;l&#41;&#46; Normal thyroid function&#58; TSH 3&#46;23&#8239;&#956;IU&#47;ml &#40;RV&#58; 0&#46;35&#8211;5&#46;0&#8239;&#956;IU&#47;ml&#41;&#44; free T4 1&#46;04&#8239;ng&#47;dl &#40;RV&#58; 0&#46;70&#8211;1&#46;98&#8239;ng&#47;dl&#41;&#46; Normal levels of immunoglobulins&#58; IgG 1300&#8239;mg&#47;dl RV&#58; 700&#8211;1609&#8239;mg&#47;dl&#59; IgM 111&#8239;mg&#47;dl &#40;RV&#58; 40&#8211;230&#8239;mg&#47;dl&#41; and IgA 201&#8239;mg&#47;dl &#40;RV&#58; 70&#8211;400&#8239;mg&#47;dl&#41;&#46; Preserved renal function&#58; creatinine 0&#46;66&#8239;mg&#47;dl &#40;RV&#58; 0&#46;50&#8211;0&#46;90&#8239;mg&#47;dl&#41;&#44; glomerular filtration rate &#40;MDRD-IDMS&#41;&#8239;&#62;&#8239;60 and negative urine protein test&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall">In the differential diagnosis of hypoalbuminemia&#44; protein loss was ruled out because there was no proteinuria&#44; dermal lesions or digestive problems&#46; Lever and kidney functions were preserved&#46; On the other hand&#44; lab prealbumin values of 62&#8239;mg&#47;dl &#40;RV&#58; 20&#8211;40&#8239;mg&#47;dl&#41; ruled out possible malnutrition&#46; However&#44; all parameters were confirmed in a new lab test in order to assess the possible haemodilution of the sample&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">Before confirming all the parameters&#44; the laboratory recommended a serum total protein test &#40;capillary electrophoresis &#91;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>A&#93;&#41; where the decrease in albumin peak was evidenced&#58; 11&#46;6&#37; &#40;RV&#58; 55&#46;8&#8211;66&#37;&#41; associated with the compensatory increase of the other protein fractions&#58; alpha 1&#58; 12&#46;3&#37; &#40;RV&#58; 2&#46;9&#8211;4&#46;9&#37;&#41;&#59; alpha 2&#58; 25&#46;5&#37; &#40;RV&#58; 7&#46;1&#8211;11&#46;8&#37;&#41;&#59; beta 1&#58; 14&#46;1&#37; &#40;RV&#58; 4&#46;7&#8211;7&#46;2&#37;&#41;&#59; beta 2&#58; 10&#46;3&#37; &#40;RV&#58; 3&#46;2&#8211;6&#46;5&#37;&#41;&#59; gamma&#58; 25&#46;9&#37; &#40;RV&#58; 11&#46;1&#8211;18&#46;8&#37;&#41;&#46; The normal distribution of proteins in capillary electrophoresis is shown in <a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>B&#46; Analbuminaemia was also confirmed by agarose gel electrophoresis &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>C and D&#41;&#46; In this case&#44; the albumin fraction was lower than that observed in capillary electrophoresis &#40;2&#46;1&#37;&#59; 0&#46;1&#8239;g&#47;dl&#41;&#46; This serum albumin concentration was confirmed by determining albuminemia by nephelometry&#58; 0&#46;121&#8239;g&#47;dl &#40;RV&#58; 3&#46;5&#8211;5&#46;2&#8239;g&#47;dl&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0075" class="elsevierStylePara elsevierViewall">Upon suspicion of CAA&#44; the patient was referred for a genetic study&#46; A new clinical examination showed perimalleolar oedema&#44; lipodystrophy&#44; and a BMI of 29&#46;5&#46; Personal history&#58; born in Brazil of non-consanguineous parents&#46; The family tree of the proband showed one abortion and one live birth&#44; while her mother had 5 abortions of a total of 10 pregnancies &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>A&#41;&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0080" class="elsevierStylePara elsevierViewall">Sanger sequencing of 14 exons plus adjacent intron regions of the <span class="elsevierStyleItalic">ALB</span> gene was carried out &#40;NM&#95;000477&#46;6&#41; in the molecular study conducted in our laboratory&#46; The homozygous variant c&#46;1289&#8239;&#43;&#8239;1G&#8239;&#62;&#8239;A was detected &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>B&#41;&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">It was recommended to report the finding to the son&#44; parents and siblings of the proband&#44; in order to offer genetic counselling&#46; The study could not be extended due to geographical impossibility&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Discussion</span><p id="par0090" class="elsevierStylePara elsevierViewall">The case of a woman with hypoalbuminemia is reported in which the most common causes of this disease are ruled out&#44; demonstrating analbuminaemia by electrophoresis and nephelometry&#46; When the CAA is suspected&#44; the molecular study of the <span class="elsevierStyleItalic">ALB</span> gene was carried out&#44; confirming this diagnosis&#46;</p><p id="par0095" class="elsevierStylePara elsevierViewall">The genetic study demonstrated the presence of the homozygous variant c&#46;1289&#8239;&#43;&#8239;1G&#8239;&#62;&#8239;A&#46; This variant&#44; previously described and called the Guimar&#227;es variant&#44; affects the canonical sequence of <span class="elsevierStyleItalic">splicing</span> 5&#8242;&#40;GT&#41;&#44; causing its inactivation&#46; The deletion of said sequence results in the complete deletion of exon 10 from the <span class="elsevierStyleItalic">ALB</span> gene during <span class="elsevierStyleItalic">splicing&#46;</span> This produces a change in the <span class="elsevierStyleItalic">frameshift</span> which implies the generation of a truncated protein &#40;p&#46;Phe398Alafs&#42;33&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a> It is a pathogenic mutation that&#44; when homozygous&#44; would explain the analbuminaemia observed in the patient&#46;</p><p id="par0100" class="elsevierStylePara elsevierViewall">So far this is the first confirmed case of CAA characterized in Spain&#46; Previously&#44; only the case of a 17-year-old male with 0&#46;55&#8239;g&#47;dl albuminemia and hypercholesterolemia &#40;454&#8239;mg&#47;dl&#41; had been published&#44; but without a confirmatory genetic study&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a></p><p id="par0105" class="elsevierStylePara elsevierViewall">Currently&#44; approximately 70 cases of CAA have been described&#44; with the Kayseri variant being the most common molecular defect&#46; It is a 2-base deletion c&#46;228&#95;229delAT found in 13 probands&#46; Until now&#44; the Guimar&#227;es variant has only been described in 4 cases in the world&#46;<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#44;8&#44;9</span></a></p><p id="par0110" class="elsevierStylePara elsevierViewall">Albumin levels are usually measured by colorimetry due to their high affinity for organic anions and complex dye molecules&#46; In our laboratory&#44; bromocresol green &#40;recommended by the American Association for Clinical Chemistry&#41; is used&#44; which has a high affinity for albumin and does not suffer interference due to high bilirubin or haemoglobin levels&#46; The literature review on CAA shows great variability of the described albuminemia &#40;values &#60;0&#46;01&#8211;1&#8239;g&#47;dl&#41; in subjects affected by CAA&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> This may be due to the lower accuracy of colorimetric assays at low albumin levels that would lead to overestimation of their serum levels&#46; The presence of aberrant molecular forms of albumin with different affinity for the dye could also explain these differences&#44; although to date&#44; circulating truncated molecular forms have not been described in these patients&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a> In our case&#44; albuminemia measured colorimetrically &#40;1&#46;6&#8239;g&#47;dl&#41; is greater than that determined by nephelometry &#40;0&#46;121&#8239;g&#47;dl&#41; and that the estimated value in the serum total protein test &#40;0&#46;1&#8239;g&#47;dl&#59; calculated as a percentage of total proteinemia&#41;&#46;</p><p id="par0115" class="elsevierStylePara elsevierViewall">Finally&#44; regarding the serum total protein test&#44; it should be noted that&#44; in the development of capillary electrophoresis&#44; the technical conditions were modified so that alpha and beta-lipoproteins migrate alongside albumin&#46; This avoids the occurrence of lipoprotein bands that can induce suspicion of the presence of monoclonal proteins in the alpha and beta fractions&#46; The consequent overestimation of the albumin fraction in subjects with normal albuminemia would not be significant&#46; However&#44; in patients with CAA &#40;severe decrease in albuminemia and increased lipoproteinemia&#41; such overestimation may be relevant&#46;</p><p id="par0120" class="elsevierStylePara elsevierViewall">Regarding the clinical stage of the patient&#44; it should be noted that her health status is good despite hypercholesterolemia &#40;in treatment since the age of 18&#41; and lower limb lipodystrophy&#46; This confirms that CAA in adults is associated with a non-serious phenotype&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Conclusions</span><p id="par0125" class="elsevierStylePara elsevierViewall">So far&#44; this is the first case confirmed by molecular study of CAA in Spain&#46; The patient has the Guimar&#227;es variant described in only 4 other patients in the world&#46;</p><p id="par0130" class="elsevierStylePara elsevierViewall">It is important that clinicians keep in mind that in patients with AAC&#44; albuminemia may be overestimated with the usual colorimetric techniques and&#44; in these cases&#44; a more specific method for the determination of albumin should be considered&#46; Additionally&#44; in the case of suspicion of CAA&#44; agarose gel electrophoresis is recommended as capillary electrophoresis overestimates the albumin fraction&#46;</p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Conflict of interests</span><p id="par0135" class="elsevierStylePara elsevierViewall">The authors declare no conflict of interest&#46;</p></span></span>"
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              "titulo" => "Molecular analysis of the ALB gene"
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            0 => "Albumin"
            1 => "<span class="elsevierStyleItalic">ALB</span> gene &#40;4q13&#46;3 chromosome&#41;"
            2 => "Congenital analbuminaemia"
            3 => "Guimar&#227;es variant"
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          "clase" => "abr"
          "titulo" => "Abbreviations"
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            0 => "CCA"
            1 => "VR"
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            0 => "Alb&#250;mina"
            1 => "gen <span class="elsevierStyleItalic">ALB</span> &#40;cromosoma 4q13&#46;3&#41;"
            2 => "Analbuminemia cong&#233;nita &#40;MIM &#35;616000&#41;"
            3 => "Variante Guimar&#227;es"
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        "titulo" => "Abstract"
        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Introduction and objectives</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Congenital analbuminaemia &#40;CCA&#41; &#40;MIM &#35;616000&#41; is an autosomal recessive disorder &#40;prevalence&#8239;&#60;&#8239;1&#47;10<span class="elsevierStyleSup">6</span>&#41; caused by defects in the <span class="elsevierStyleItalic">ALB</span> gene leading to absence or severe reduction of albuminaemia&#46; This paper describes a case of CCA detected and diagnosed in our hospital&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Materials and methods</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">A 42-year old woman showing hypoproteinaemia and hypoalbuminaemia of unknown aetiology&#46; Biochemical study was performed according to routine quality controlled analytical procedures&#58; albuminaemia &#40;colorimetric and nephelometric methods&#41;&#46; Protein electrophoresis &#40;capillary and agarose gel&#41;&#46; Molecular study of the <span class="elsevierStyleItalic">ALB</span> gene&#58; DNA extraction&#44; PCR amplification of the 14 coding exons plus adjacent intron regions and Sanger sequencing&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Results</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">After discarding the most common causes of hypoalbuminaemia&#44; the analbuminaemia was confirmed by nephelometry and protein electrophoresis&#46; The proband was found to be homozygous for molecular defect in the <span class="elsevierStyleItalic">ALB</span> gene&#58; variant c&#46;1289&#8239;&#43;&#8239;1G&#8239;&#62;&#8239;A previously reported as Guimar&#227;es variant&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Conclusions</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">This is the first case of CCA confirmed by molecular study in Spain&#46; The proband shows the Guimar&#227;es variant previously described in 4 patients worldwide&#46;</p></span>"
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        "resumen" => "<span id="abst0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Introducci&#243;n y objetivos</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">La analbuminemia cong&#233;nita &#40;AAC&#41; &#40;MIM &#35;616000&#41; es una enfermedad autos&#243;mica recesiva &#40;prevalencia&#8239;&#60;&#8239;1&#47;10<span class="elsevierStyleSup">6</span>&#41; causada por defectos en el gen <span class="elsevierStyleItalic">ALB</span> que implican la ausencia o marcada disminuci&#243;n de la albuminemia&#46; En este art&#237;culo&#44; describimos un caso de AAC detectado en nuestro hospital&#46;</p></span> <span id="abst0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Material y m&#233;todos</span><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">Mujer de 42 a&#241;os con hipoproteinemia e hipoalbuminemia de causa no filiada&#46; El estudio bioqu&#237;mico se realiz&#243; siguiendo las t&#233;cnicas y los controles de calidad habituales de nuestro laboratorio&#58; albuminemia &#40;colorimetr&#237;a y nefelometr&#237;a&#41;&#59; electroforesis de prote&#237;nas &#40;capilar y gel de agarosa&#41; y an&#225;lisis molecular del gen <span class="elsevierStyleItalic">ALB</span> &#40;extracci&#243;n de ADN y amplificaci&#243;n PCR de los 14 exones codificantes m&#225;s regiones intr&#243;nicas adyacentes y secuenciaci&#243;n Sanger&#41;&#46;</p></span> <span id="abst0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Resultados</span><p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">Descartadas las causas m&#225;s frecuentes de hipoalbuminemia&#44; se confirm&#243; la analbuminemia por electroforesis y nefelometr&#237;a&#46; El estudio molecular del gen <span class="elsevierStyleItalic">ALB</span> evidenci&#243; la presencia de la variante c&#46;1289&#8239;&#43;&#8239;1G&#8239;&#62;&#8239;A &#40;variante Guimar&#227;es&#41; en homozigosis&#46;</p></span> <span id="abst0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Conclusiones</span><p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">Este es el primer caso confirmado mediante estudio molecular de AAC en Espa&#241;a&#46; La paciente presenta la variante Guimar&#227;es descrita previamente en otros 4 pacientes en el mundo&#46;</p></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Cabrejas N&#250;&#241;ez MJ&#44; Izquierdo &#193;lvarez C&#44; Gonz&#225;lez Vioque E&#44; Almer&#237;a Lafuente A&#44; Silvestre Mardomingo R&#193;&#46; Detecci&#243;n y diagn&#243;stico molecular de un nuevo caso dea nalbuminemia cong&#233;nita&#46; Med Clin &#40;Barc&#41;&#46; 2020&#59;154&#58;275&#8211;278&#46;</p>"
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          "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Electrophoretic profiles&#46; In each case the blue arrow indicates the albumin fraction&#46; Capillary electrophoresis &#40;A and B&#41;&#58; &#40;A&#41; Capillary electrophoresis of the patient&#8217;s serum showing a significant decrease in the albumin fraction &#40;blue boxed values&#41; and a compensatory increase in the alpha and beta fractions&#46; &#40;B&#41; Normal protein distribution in capillary electrophoresis&#46; Note&#58; The scale of the graphs is adjusted to the highest protein fraction&#46; Gel electrophoresis &#40;B and C&#41;&#46; &#40;C&#41; Electrophoretic profile of the patient&#8217;s serum on an agarose gel that shows the drastic reduction of the albumin fraction &#40;blue boxed values&#41; associated with a compensatory increase in the alpha and beta fractions&#46; &#40;D&#41; Agarose gel &#40;the fractions in which the serum proteins are separated are identified to the right of the image&#41;&#46; The migration on the left corresponds to the sample of the patient &#40;marked with a black arrow&#41;&#59; the rest of the migrations correspond to samples of four subjects with normal albuminemia&#46;</p>"
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