glutaric aciduria type 1

The severity of glutaric acidemia type 1 varies widely; some individuals are only mildly affected, while others suffer severe problems. GA1 can be defined as two clinical entities: GA-1 diagnosed at birth or pre-birth and managed through dietary restrictions, and GA-1 diagnosed after an encephalopathic crisis. A crisis may occur under both headings, but the care of individuals diagnosed before a crisis can be managed to avoid most or all injury.{{cn|date=October 2021}}

Babies with glutaric acidemia type 1 often are born with unusually large heads (macrocephaly). Macrocephaly is amongst the earliest signs of GA1. It is thus important to investigate all cases of macrocephaly of unknown origins for GCDH deficiency,{{Cite journal |last=Mahfoud Hawilou |first=Antonieta |last2=Domínguez Méndez |first2=Carmen Luisa |last3=Rizzo |first3=Cristiano |last4=Ribes Rubio |first4=Antonia |date=2004 |title=Macrocefalia in utero como manifestación clínica de aciduria glutárica tipo I. Informe de una nueva mutación |trans-title=In Utero Macrocephaly as Clinical Manifestation of Glutaric Aciduria Type I. Report of a Novel Mutation |journal=Revista de Neurología |language=es |volume=39 |issue=10 |pages=939–942 |doi=10.33588/rn.3910.2004258 |pmid=15573311}}{{Cite journal |last=Martínez Granero |first=MA |last2=Garcia Pérez |first2=A |last3=Martínez-Pardo |first3=M |last4=Parra |first4=E |year=2005 |title=Macrocefalia como forma de presentación de la aciduria glutárica tipo 1. Importancia de un diagnóstico precoz |trans-title=Macrocephaly the first manifestation of glutaric aciduria type I: the importance of early diagnosis |url=https://dialnet.unirioja.es/servlet/articulo?codigo=1218025 |journal=Neurología |volume=20 |issue=5 |pages=255–260 |pmid=15954035}} given the importance of the early diagnosis of GA1.{{Cite journal |last=Strauss |first=Kevin A. |last2=Puffenberger |first2=Erik G. |last3=Robinson |first3=Donna L. |last4=Morton |first4=D. Holmes |date=15 August 2003 |title=Type I glutaric aciduria, part 1: Natural history of 77 patients |journal=American Journal of Medical Genetics |volume=121C |issue=1 |pages=38–52 |doi=10.1002/ajmg.c.20007 |pmid=12888985 |s2cid=23370609}}

Macrocephaly is a pivotal clinical sign of many neurological diseases. Physicians and parents should be aware of the benefits of investigating for an underlying neurological disorder, particularly a neurometabolic one, in children with head circumferences in the highest percentiles.Accogli A, Geraldo AF, Piccolo G, Riva A, Scala M, Balagura G, Salpietro V, Madia F, Maghnie M, Zara F, Striano P, Tortora D, Severino M and Capra V (2022) [https://www.frontiersin.org/articles/10.3389/fped.2021.794069/full Diagnostic Approach to Macrocephaly in Children]. Frontiers in Pediatrics 9:794069.

[https://doi.org/10.3389/fped.2021.794069 doi:10.3389/fped.2021.794069]

Affected individuals may have difficulty moving and may experience spasms, jerking, rigidity or decreased muscle tone and muscle weakness (which may be the result of secondary carnitine deficiency). GA, in patients who have suffered a crisis, can be defined as a cerebral palsy of genetic origins.{{cn|date=October 2021}}{{Clarify|reason=sentence not useful by itself; needs more explanation of what brain structures are affected|date=January 2022}}

Image:GA1 posture2.jpg

A common way to manage striatal necrosis is to provide special seating. These special wheelchairs are designed to limit abnormal movements. However, spasticity can be worsened by constraint. Parents and caregivers can provide a more interactive occupational therapy by enabling the child to use his or her own excessive postural muscle tone to his or her own advantage (see picture; note the care with which minimal pressure is applied while ensuring safety).{{cn|date=October 2021}}

The excessive tone can also be managed with hanging doorway baby exercisers and other aids to the upright stance that do not constrain the child but help him or her gradually tone down the rigidity.{{cn|date=October 2024}}

Some individuals with glutaric acidemia have developed bleeding in the brain or eyes that could be mistaken for the effects of child abuse.{{cn|date=October 2024}}

The condition is inherited in an autosomal recessive pattern: mutated copies of the gene GCDH must be provided by both parents to cause GA1. The GCDH gene encodes the enzyme glutaryl-CoA dehydrogenase. This enzyme is involved in degrading the amino acids lysine, hydroxylysine and tryptophan. Mutations in the GCDH gene prevent production of the enzyme or result in the production of a defective enzyme with very low residual activity, or an enzyme with relatively high residual activity but still phenotypic consequences.{{Cite journal |vauthors=Christensen E, Aracil A, Vilaseca MA, Busquets C, Ribes A, Pineda M |year=1998 |title=Glutaric aciduria type I with high residual glutaryl-CoA dehydrogenase activity |journal=Dev Med Child Neurol |volume=40 |issue=12 |pages=840–2 |doi=10.1111/j.1469-8749.1998.tb12362.x |pmid=9881681 |doi-access=free}}{{Cite journal |last=Christensen |first=E. |last2=Ribes |first2=A. |last3=Merinero |first3=B. |last4=Zschocke |first4=J. |date=2004 |title=Correlation of genotype and phenotype in glutaryl-CoA dehydrogenase deficiency |journal=Journal of Inherited Metabolic Disease |volume=27 |issue=6 |pages=861–868 |doi=10.1023/B:BOLI.0000045770.93429.3c |pmid=15505393 |s2cid=24612304}} This enzyme deficiency allows glutaric acid, 3-hydroxyglutaric acid and to a lesser extent glutaconic acid to build up to abnormal levels, especially at times when the body is under stress. These intermediate breakdown products are particularly prone to affect the basal ganglia, causing many of the signs and symptoms of GA1.{{cn|date=October 2024}}

GA1 occurs in approximately 1 of every 30,000 to 40,000 births. As a result of founder effect, it is much more common in the Amish community and in the Ojibway population of Canada,{{Citation |last=Larson |first=Austin |title=Glutaric Acidemia Type 1 |date=1993 |work=GeneReviews |editor-last=Adam |editor-first=Margaret P. |editor-last2=Ardinger |editor-first2=Holly H. |editor-last3=Pagon |editor-first3=Roberta A. |editor-last4=Wallace |editor-first4=Stephanie E. |url=http://www.ncbi.nlm.nih.gov/books/NBK546575/ |access-date=2022-01-08 |place=Seattle (WA) |publisher=University of Washington, Seattle |pmid=31536184 |last2=Goodman |first2=Steve}} where up to 1 in 300 newborns may be affected.

Relatives of children with GA1 can have low GCDH activity: in an early study of GA1, GCDH activity was found to be 38%, 42%, and 42% in three of the four unaffected relatives tested, a pattern consistent with the 50% level that would be expected in heterozygous carriers.{{Cite journal |last=Whelan |first=DT |last2=Hill |first2=R |last3=Ryan |first3=ED |last4=Spate |first4=M |date=January 1979 |title=L-Glutaric acidemia: investigation of a patient and his family. |journal=Pediatrics |volume=63 |issue=1 |pages=88–93 |doi=10.1542/peds.63.1.88 |pmid=440804 |s2cid=41194171}} Those levels are close to those found in some heavily symptomatic GA1-affected children.

Normally, magnetic resonance imaging shows the Sylvian fissure to be operculated, but in GA1-associated encephalopathy, operculation is absent. In many jurisdictions, GA1 is included in newborn screening panels. Elevated glutarylcarnitine can be detected by mass spectrometry in a dried blood spot collected shortly after birth. After a positive screening result, confirmatory testing is performed. This includes urine organic acid analysis, looking for glutaric acid and 3-hydroxyglutaric acid. Plasma and urine acylcarnitine analysis can also be informative. Molecular analysis, including gene sequencing and copy number analysis of GCDH, can be performed to confirm the diagnosis. Molecular testing can also provide information for family planning and prenatal testing, if desired.{{cn|date=October 2024}}

Like many other organic acidemias, GA1 causes carnitine depletion.{{Cite journal |last=Winter |first=S. C. |date=2003 |title=Treatment of carnitine deficiency |journal=Journal of Inherited Metabolic Disease |volume=26 |issue=2 |pages=171–180 |doi=10.1023/a:1024433100257 |pmid=12889658 |s2cid=5563622}} Whole-blood carnitine can be raised by oral supplementation. However, this does not significantly change blood concentrations of glutarylcarnitine or esterified carnitine, suggesting that oral supplementation is suboptimal in raising tissue levels of carnitine. Clinical nutrition researchers have likewise concluded that oral carnitine raises plasma levels but does not affect those in muscles, where most of it is stored and used.{{Cite journal |last=Brass |first=Eric P |date=August 2000 |title=Supplemental carnitine and exercise |journal=The American Journal of Clinical Nutrition |volume=72 |issue=2 |pages=618S–623S |doi=10.1093/ajcn/72.2.618S |pmid=10919968 |doi-access=free}}

In contrast, regular intravenous infusions of carnitine cause distinct clinical improvements: "decreased frequency of decompensations, improved growth, improved muscle strength and decreased reliance on medical foods with liberalization of protein intake."

Choline increases carnitine uptake and retention.{{Cite journal |last=Daily |first=James W. |last2=Sachan |first2=Dileep S. |date=July 1995 |title=Choline Supplementation Alters Carnitine Homeostasis in Humans and Guinea Pigs |journal=The Journal of Nutrition |volume=125 |issue=7 |pages=1938–1944 |doi=10.1093/jn/125.7.1938 |pmid=7616311}} Choline supplements are inexpensive, are safe (probably even in children requiring anticholinergics) and can increase exercise tolerance, truncal tone and general well-being, providing evidence of the suboptimal efficiency of carnitine supplementation alone.{{cn|date=October 2024}}

Dietary control may help limit progression of the neurological damage.{{cn|date=October 2024}}

Lysine restriction, as well as carnitine supplementation, are considered the best predictors of a good prognosis for GA1. This excludes, however, patients who already suffered an encephalopathic crisis, for whom the prognosis is more related to the treatment of their acquired disorder (striatal necrosis, frontotemporal atrophy).{{cn|date=October 2024}}

Vegetarian diets and, for younger children, breastfeeding{{Cite journal |last=Gokcay |first=G. |last2=Baykal |first2=T. |last3=Gokdemir |first3=Y. |last4=Demirkol |first4=M. |date=April 2006 |title=Breast feeding in organic acidaemias |journal=Journal of Inherited Metabolic Disease |volume=29 |issue=2–3 |pages=304–310 |doi=10.1007/s10545-005-0255-y |pmid=16763892 |s2cid=3147346}} are common ways to limit protein intake without endangering tryptophan transport to the brain.

Formulas such as XLys, XTrp Analog, XLys, XTrp Maxamaid, XLys, XTrp Maxamum or Glutarex 1 are designed to provide amino acids other than lysine and tryptophan, to help prevent protein malnutrition.{{cn|date=October 2024}}

The entry of tryptophan into the brain is crucial in the proper synthesis of the neurotransmitter serotonin in the brain. One way to acutely cause depression, bulimia or anxiety in humans, in order to assess an individual's vulnerability to those disorders, is to supplement with a formula with all or most amino acids except tryptophan.{{Citation needed|date=January 2022}} Acute tryptophan depletion is a diagnostic procedure, not a treatment for GA1. The protein synthesis elicited by the amino acids leads circulating amino acids, including tryptophan, to be incorporated into proteins. Tryptophan is thus lowered in the brain as a result of the protein synthesis enhancement, causing circulating tryptophan to drop more than other amino acids.{{Cite journal |last=Young SN |year=1993 |title=The use of diet and dietary components in the study of factors controlling affect in humans: a review |journal=J Psychiatry Neurosci |volume=18 |issue=5 |pages=235–44 |pmc=1188544 |pmid=8297922}} A relative excess of other large neutral amino acids may also compete with tryptophan for transport across the blood–brain barrier through the large neutral amino acid transporter 1. The consequence is acute tryptophan depletion in the brain and a consequent decrease in serotonin synthesis.{{cn|date=October 2024}}

5-Hydroxytryptophan, a precursor of serotonin that is not metabolized to glutaryl-CoA, glutaric acid and secondary metabolites, could be used as an adjunct to selective tryptophan restriction, although it has risks. However, the evidence in favour of selective tryptophan restriction remains insufficient and the consensus is evolving towards the restriction of lysine only. In the Amish community, where GA1 is overrepresented, patients with GA1 typically do not receive tryptophan-free formulas, either as the sole source of amino acids or as a supplement to protein restriction.{{cn|date=October 2024}}

A possible way to prevent the build-up of metabolites is to limit lysine and hydroxylysine degradation, as lysine is one of the most abundant amino acids and tryptophan is one of the least abundant amino acids.{{cn|date=October 2024}}

Humans lack the enzyme L-gulonolactone oxidase, which is necessary for the synthesis of ascorbic acid (vitamin C), leaving them dependent on dietary sources of this vitamin. Vitamin C is a necessary cofactor for the utilization of lysine in collagen synthesis. Collagen, the most abundant protein in the human body, requires great amounts of lysine, the most abundant amino acid in proteins. Ascorbic acid, the main hydroxyl radical quencher, works as the cofactor providing the hydroxyl radical required for collagen cross-linking; lysine thus becomes hydroxylysine.{{cn|date=October 2024}}

GA1 worsens during stresses and catabolic episodes, such as fasts and infections. Endogenous catabolism of proteins could be an important route for glutaric acid production. It follows that collagen breakdown (and protein breakdown in general) should be prevented by all possible means.{{cn|date=October 2024}}

Ascorbic acid is used to prevent multiple organ failure and to lessen mortality and morbidity in intensive care units.{{Cite journal |last=Lovat |first=R. |last2=Preiser |first2=J. C. |year=2003 |title=Antioxidant therapy in intensive care |journal=Current Opinion in Critical Care |volume=9 |issue=4 |pages=266–270 |doi=10.1097/00075198-200308000-00003 |pmid=12883280 |s2cid=19893545}} It thus appears reasonable to add sufficient doses of ascorbic acid to the treatment protocol during stresses and other challenges to growth in order to stimulate collagen synthesis and thus prevent lysine breakdown.{{cn|date=October 2024}}

The conversion of tryptophan to serotonin and other metabolites depends on vitamin B₆.{{Cite journal |last=Hartvig |first=P. |last2=Lindner |first2=K. J. |last3=Bjurling |first3=P. |last4=Långström |first4=B. |last5=Tedroff |first5=J. |date=June 1995 |title=Pyridoxine effect on synthesis rate of serotonin in the monkey brain measured with positron emission tomography |journal=Journal of Neural Transmission |volume=102 |issue=2 |pages=91–97 |doi=10.1007/BF01276505 |pmid=8748674 |s2cid=39796582}} If tryptophan catabolism has any impact on brain glutaric acid and other catabolite levels, vitamin B₆ levels should be routinely assayed and normalized in the course of the treatment of GA1.{{cn|date=October 2024}}

Stress caused by infection, fever or other demands on the body may lead to worsening of the signs and symptoms, with only partial recovery.{{cn|date=October 2024}}

A 2006 study of 279 patients found that of those with symptoms (185, 66%), 95% had suffered an encephalopathic crises, usually with following brain damage. Of the participants in the study, 49 children died and the median age of death was 6.6 years. A Kaplan–Meier analysis of the data estimated that about 50% of symptomatic people would die by the age of 25.{{Cite journal |last=Kölker |first=Stefan |last2=Garbade |first2=Sven F |last3=Greenberg |first3=Cheryl R |last4=Leonard |first4=James V |last5=Saudubray |first5=Jean-Marie |last6=Ribes |first6=Antonia |last7=Kalkanoglu |first7=H Serap |last8=Lund |first8=Allan M |last9=Merinero |first9=Begoña |last10=Wajner |first10=Moacir |last11=Troncoso |first11=Mónica |last12=Williams |first12=Monique |last13=Walter |first13=John H |last14=Campistol |first14=Jaume |last15=MartÍ-Herrero |first15=Milagros |date=June 2006 |title=Natural History, Outcome, and Treatment Efficacy in Children and Adults with Glutaryl-CoA Dehydrogenase Deficiency |journal=Pediatric Research |volume=59 |issue=6 |pages=840–847 |doi=10.1203/01.pdr.0000219387.79887.86 |pmid=16641220 |doi-access=free |last16=Caswill |first16=Melissa |last17=Burlina |first17=Alberto B |last18=Lagler |first18=Florian |last19=Maier |first19=Esther M |last20=Schwahn |first20=Bernd |last21=Tokatli |first21=Aysegul |last22=Dursun |first22=Ali |last23=Coskun |first23=Turgay |last24=Chalmers |first24=Ronald A |last25=Koeller |first25=David M |last26=Zschocke |first26=Johannes |last27=Christensen |first27=Ernst |last28=Burgard |first28=Peter |last29=Hoffmann |first29=Georg F}}

More recent studies provide an updated prognosis whereby individuals affected can, through proper dietary management and carnitine supplementation, manage the disease with a much improved prognosis. Newborn screening has allowed affected patients to avoid crises and live full lives without any injury to the brain. It is essential that patients with the disease be diagnosed at or before birth and that all variables be strictly managed in order to maintain quality of life. When suspected and in the absence of confirmed diagnosis (through genetic sequencing), it is critical that the individual maintain a diet restrictive of all proteins and that blood sugars be monitored rigorously. The WHO now considers this disease entirely manageable.{{Cite journal |last=Boy |first=Nikolas |last2=Mühlhausen |first2=Chris |last3=Maier |first3=Esther M. |last4=Heringer |first4=Jana |last5=Assmann |first5=Birgit |last6=Burgard |first6=Peter |last7=Dixon |first7=Marjorie |last8=Fleissner |first8=Sandra |last9=Greenberg |first9=Cheryl R. |last10=Harting |first10=Inga |last11=Hoffmann |first11=Georg F. |last12=Karall |first12=Daniela |last13=Koeller |first13=David M. |last14=Krawinkel |first14=Michael B. |last15=Okun |first15=Jürgen G. |date=16 November 2016 |title=Proposed recommendations for diagnosing and managing individuals with glutaric aciduria type I: second revision |journal=Journal of Inherited Metabolic Disease |volume=40 |issue=1 |pages=75–101 |doi=10.1007/s10545-016-9999-9 |pmid=27853989 |s2cid=6316667 |last16=Opladen |first16=Thomas |last17=Posset |first17=Roland |last18=Sahm |first18=Katja |last19=Zschocke |first19=Johannes |last20=Kölker |first20=Stefan}}

GA1 can be described as a metabolic disorder, a neurometabolic disease, a cerebral palsy or a basal ganglia disorder (it may also be misdiagnosed as shaken baby syndrome).

Depending on the paradigm adopted, GA1 will mostly be managed with precursor restriction or with neurorehabilitation.{{cn|date=October 2024}}

So-called "orphan diseases", such as GA1, can be adopted into wider groups of diseases (such as carnitine deficiency diseases, cerebral palsies of diverse origins, basal ganglia disorders, and others); Morton at al. (2003b) emphasize that acute striatal necrosis is a distinctive pathologic feature of at least 20 other disorders of very different etiologies, including, HIV encephalopathy–AIDS dementia complex, pneumococcal meningitis, hypoadrenal crisis, methylmalonic acidemia, propionic acidemia, middle cerebral artery occlusion, hypertensive vasculopathy, acute Mycoplasma pneumoniae infection, 3-nitropropionic acid intoxication, late-onset familial dystonia, cerebrovascular abrupt and severe neonatal asphyxia ("selective neuronal necrosis").{{cn|date=October 2024}}

In a cohort of 279 patients who had been reported to have GA1, 185 were symptomatic (two-thirds); being symptomatic was seen as an indication of low treatment efficacy. Screening of those known to be at high risk, neonatal population screening and a diagnosis of macrocephaly are the ways to identify bearers of the GCDH mutation who are not frankly symptomatic. Macrocephaly remains the main sign of GA1 for those who have no relatives with GA1 and have not been included in a population screening program. GA1 is considered a treatable disease.

Two-thirds of the patients who have GA1 encephalopathy will receive little benefit from the treatment for GA1 but can benefit from treatments given to victims of middle cerebral artery occlusion, AIDS dementia and other basal ganglia disorders: brain implants, stem cell neurorestoration, growth factors, monoaminergic agents, and many other neurorehabilitation strategies.{{cn|date=October 2024}}

{{Reflist}}

• {{Cite journal |last=Mahfoud Hawilou |first=Antonieta |last2=Domínguez Méndez |first2=Carmen Luisa |last3=Rizzo |first3=Cristiano |last4=Ribes Rubio |first4=Antonia |date=2004 |title=Macrocefalia in utero como manifestación clínica de aciduria glutárica tipo I. Informe de una nueva mutación |trans-title=In utero macrocephaly as clinical manifestation of glutaric aciduria type I. Report of a novel mutation |journal=Revista de Neurología |language=es |volume=39 |issue=10 |pages=939–942 |doi=10.33588/rn.3910.2004258 |pmid=15573311}}
• {{Cite journal |vauthors=Martínez Granero MA, Garcia Pérez A, Martínez-Pardo M, Parra E |year=2005 |title=[Macrocephaly the first manifestation of glutaric aciduria type I: the importance of early diagnosis.] |url=http://www.arsxxi.com/Revistas/mostrararticulo.php?idarticulo=51090515 |journal=Neurologia |language=es |volume=20 |issue=5 |pages=255–60 |pmid=15954035}}
• {{Cite journal |vauthors=Strauss KA, Morton DH |year=2003 |title=Type I glutaric aciduria, part 2: a model of acute striatal necrosis |url=http://www.clinicforspecialchildren.org/format/Strauss_2003b.pdf |journal=Am J Med Genet C Semin Med Genet |volume=121C |issue=1 |pages=53–70 |doi=10.1002/ajmg.c.20008 |pmid=12888986 |s2cid=22759360 |archive-url=https://web.archive.org/web/20050130233654/http://www.clinicforspecialchildren.org/format/Strauss_2003b.pdf |archive-date=January 30, 2005}} see also Part 1 referenced above

• {{NLM|glutaricacidemiatypei}} - Type 1

{{Medical resources

| ICD10 = {{ICD10|E|72|3|e|70}}

| ICD9 =

| ICDO =

| OMIM = 231670

| MedlinePlus =glutaric-acidemia-type-i

| eMedicineSubj =

| eMedicineTopic =

| DiseasesDB = 29830

|ICD11={{ICD11|5C50.E1}}|Orphanet=25|MeshID=C536833|NORD=glutaricaciduria-i|GARDNum=6522|GARDName=glutaryl-coa-dehydrogenase-deficiency}}

{{Amino acid metabolic pathology}}

{{DEFAULTSORT:Glutaric Aciduria Type 1}}

Category:Amino acid metabolism disorders

Category:Autosomal recessive disorders

Category:Rare diseases