A novel mutation of the ACADM gene (c.145C>G) associated with the common c.985A>G mutation on the other ACADM allele causes mild MCAD deficiency: a case report
- Anne-Frédérique Dessein1,
- Monique Fontaine1,
- Brage S Andresen2, 3,
- Niels Gregersen2,
- Michèle Brivet4,
- Daniel Rabier5,
- Silvia Napuri-Gouel6,
- Dries Dobbelaere7,
- Karine Mention-Mulliez7,
- Annie Martin-Ponthieu1,
- Gilbert Briand1, 8,
- David S Millington9,
- Christine Vianey-Saban10,
- Ronald JA Wanders11 and
- Joseph Vamecq1, 12Email author
© Dessein et al; licensee BioMed Central Ltd. 2010
Received: 13 April 2010
Accepted: 5 October 2010
Published: 5 October 2010
A female patient, with normal familial history, developed at the age of 30 months an episode of diarrhoea, vomiting and lethargy which resolved spontaneously. At the age of 3 years, the patient re-iterated vomiting, was sub-febrile and hypoglycemic, fell into coma, developed seizures and sequels involving right hemi-body. Urinary excretion of hexanoylglycine and suberylglycine was low during this metabolic decompensation. A study of pre- and post-prandial blood glucose and ketones over a period of 24 hours showed a normal glycaemic cycle but a failure to form ketones after 12 hours fasting, suggesting a mitochondrial β-oxidation defect. Total blood carnitine was lowered with unesterified carnitine being half of the lowest control value. A diagnosis of mild MCAD deficiency (MCADD) was based on rates of 1-14C-octanoate and 9, 10-3H-myristate oxidation and of octanoyl-CoA dehydrogenase being reduced to 25% of control values. Other mitochondrial fatty acid oxidation proteins were functionally normal. De novo acylcarnitine synthesis in whole blood samples incubated with deuterated palmitate was also typical of MCADD. Genetic studies showed that the patient was compound heterozygous with a sequence variation in both of the two ACADM alleles; one had the common c.985A>G mutation and the other had a novel c.145C>G mutation. This is the first report for the ACADM gene c.145C>G mutation: it is located in exon 3 and causes a replacement of glutamine to glutamate at position 24 of the mature protein (Q24E). Associated with heterozygosity for c.985A>G mutation, this mutation is responsible for a mild MCADD phenotype along with a clinical story corroborating the emerging literature view that patients with genotypes representing mild MCADD (high residual enzyme activity and low urinary levels of glycine conjugates), similar to some of the mild MCADDs detected by MS/MS newborn screening, may be at risk for disease presentation.
Mitochondrial fatty acid oxidation defects (FAOD) are rare inherited diseases with clinical presentation ranging from severe outcome to asymptomatic status. Diagnosis of FAOD requires specific investigations including biochemical and genetic studies. The most common FAOD is represented by a deficiency in the activity of the medium-chain acyl-CoA dehydrogenase (MCAD, EC 126.96.36.199) protein, which is coded by the ACADM gene (chromosome 1p31) [1–4]. First reported in 1976  and biochemically characterized in 1982 , MCAD deficiency (MCADD) has since been extensively described. Point mutations in the ACADM gene were reported early [7, 8] and many mutations have been documented subsequently, in part as a result of the large development of screening strategies [9–18]. As a general rule, these mutations lead to either truncated/absent protein synthesis, or replacement of one amino acid by another with a consequent drop in the activity of the mutant protein. The most common ACADM mutation is c.985A>G, which causes the replacement of a lysine by a glutamate at position 329 of the precursor protein (position 304 of the mature protein) [3, 17], being for this reason also referred to as the K329E (or K304E) protein variant. Eighty percent of symptomatic MCADD patients of European origin are homozygous for this mutation, and a further 18% of symptomatic MCADD are associated with the c.985A>G mutation in one allele and a rare mutation in the other allele [1, 3, 19, 20]. Mutations other than c.985A>G may predominate in non-European populations [21, 22].
MCADD is inherited as an autosomal recessive trait [2, 3, 23, 24]. Like other genetic β-oxidation defects, MCADD may cause in early childhood life-threatening events like hypoketotic/hypoglycaemic comas occurring during the course of catabolic states which disrupt the body energetic production/expense balance (infectious episodes, for instance) [2, 3, 23, 24]. In fact, MCADD may present phenotypically as either a classical (severe) or a mild form. In mild MCADD, the residual MCAD activity is intermediate between that observed in classical MCADD (usually less than a few percent) and their heterozygous carriers (around 50%) , the classical form of the disease resulting mainly from homozygosity for the c.985A>G mutation as mentioned above. The residual activity of the ACADM gene product and hence its impact on cell metabolism and patient clinical presentation depends on a series of factors including protein misfolding, MCAD tetramer stability, and thermosensitivity of the mutant protein [3, 26–28] along with contribution from the overlapping activities of other mitochondrial acyl-CoA dehydrogenases and efficacy of L-carnitine-based detoxification. In turn, a toxic "gain-of-function" pathogenesis has been also proposed for some MCAD variants .
Febrile episodes may negatively impact the disease outcome, especially when the mutant protein is thermosensitive, which is the case for the most common K304E protein variant . The patient has then to face concomitantly not only the increased energy demand but also the sudden lowering of the fatty acid oxidation-derived energy production secondary to a drop in residual MCAD activity. This might explain why one quarter of the patients with classical MCADD do not survive their first life-threatening episode and why this disease is present in the etiology list for sudden infant death syndrome [29–31].
Like patients with classical MCADD, patients with mild MCADD may develop metabolic decompensation in their early childhood. They may have to cope throughout life with neurological sequels or other irreversible lesions caused by early childhood metabolic decompensation. These sequels do not necessarily reflect the MCADD genotype but rather are the consequences of the life threatening episode before medical intervention. Recent work, however, suggests that the link between susceptibility to develop metabolic decompensation and MCADD patient genotype is not straightforward and that this susceptibility is largely dependent on environmental triggers such as starvation stress, infection and/or fever [3, 18]. We report here on a patient with mild MCADD having undergone a severe metabolic decompensation and subsequent clinical sequels. Genetic studies revealed a previously unreported mutation (c.145C<G) in one of the ACADM alleles combined with the common c.985A>G mutation in the other allele. Biochemical investigations of the patient are reported along with clinical data from the same time and an assessment of the impact of the new mutant protein variant is discussed.
Materials and methods
Solvents, reagents and internal calibrators for in vitro biological explorations
Chemical reagents and solvents were HPLC grade and were obtained from Merck, acetonitrile from JT Baker, 1-butanol and methanol from Prolabo, and stable isotopes including [16-2H3, 15-2H2]-palmitate (substrate), [16-2H3]-pamitoylcarnitine, [8-2H3]-octanoylcarnitine and [3-2H3]-propionylcarnitine (internal standards) from CDN-Isotopes Inc. L-carnitine and other chemicals were from Sigma (St Louis, MO).
Determinations of body fluid organic acids, acylglycines, carnitine (total, unesterified and esterified forms) and acylcarnitines
Trimethylsilyl derivatives of organic acids were quantified using capillary gas chromatography (GC) coupled to mass spectrometry (MS), and total and unesterified carnitine levels were determined as previously described [32, 33]. Individual acylcarnitines in body fluids were analyzed by fast atom bombardment (FAB)-MS or MS-MS of a blood spot on filter paper (Guthrie card) [33–35].
Preparation of lymphocytes and culture of fibroblasts
Mononuclear cells were isolated from 10 mL of blood, using a Ficoll-Paque procedure. The pellet was suspended in Dulbecco's phosphate buffered saline with 0.9 mM Ca2+ and 0.5 mM Mg2+, pH 7.35 (PBS), in order to adjust total cell proteins of the cell suspension to 1 ± 0.4 mg/ml for enzymatic determinations.
Fatty acid oxidation rate studies on lymphocytes and fibroblasts
Tritiated water release experiments  were performed in triplicate, in 24-well microtiter plates. [9, 10(n)-3H] palmitic and myristic acids bound to albumin (0.5 mg/ml) were used as substrates, at a final concentration of 100 μmol/l in PBS.
Measurement of individual enzymes of fatty acid oxidation
Preparation of DNA samples of blood origin and PCR, purification and sequence analysis of exons of the ACADM gene were performed as described previously .
Procedure relative to de novo synthesis of acylcarnitines by whole blood samples
De novo synthesis of acylcarnitines by whole blood samples incubated with deuterated palmitate was monitored essentially as described in Dessein et al.  with the ESI tandem mass spectrometry performed with either a Perkin Elmer mass or a Micromass Quattro PremierTM mass spectrometer.
First clinical symptoms and biological data
The patient was born normally as a result of a twin pregnancy, her twin brother being clinically healthy. Her eldest brother has also been healthy. She had a normal gestation and familial history.
At the age of 30 months, she was hospitalized for diarrhea without fever, vomiting and lethargy. Electroencephalogram and brain scanner examinations were normal. Glycaemia was normal as well as aminoacidogram. Discrete biological liver cytolysis was noticed with GOT and GPT increased at 45 and 90 IU/l, respectively (upper control values at 30 IU/l) along with echographical signs of mild hepatomegaly. Viral and bacterial serology was negative. This episode spontaneously resolved in a couple of days, and the patient recovered rapidly to a healthy status and normal life activities.
At the age of 3 years, she re-iterated an episode of vomiting which was sub-febrile (38.5°C) and followed by a coma, requiring a new hospitalization. On this occasion, marked hypoglycaemia (0.17 g/L) was documented and the patient presented with tonic-clonic seizures on the right side which persisted for 3 days and was treated by combined phenobarbital and phenytoin. The recovery of this status epilepticus was progressive. The child developed, however, sequels including a deficit of the right hemi-body, delay in the language acquisition, and electroencephalographic abnormalities in the rear area of the left hemisphere. The biological analyses revealed a liver cytolysis (increased blood levels of GPT [96 IU/l] and GOT [134 IU/l]) without signs of hepatic failure. A study of pre- and post-prandial blood glucose and ketones over a period of 24 hours showed normal glycaemias but a failure to form ketones after 12 hours fasting. This prompted a study of mitochondrial fatty acid oxidation via metabolite analyses in body fluids samples and biochemical measurements in cultured skin fibroblasts and lymphocytes. The diagnostic biological/biochemical investigations were completed by genetic studies and functional assessment of de novo acylcarnitine synthesis by whole blood samples.
Diagnostic biological and biochemical explorations
- Metabolite analyses
Major metabolite analysis data in patient
Type of analysis
URINARY ORGANIC ACIDS
UPON METABOLIC CRISIS
22 (82 c )
12 (45 c )
10 (37 c )
Esterified/unesterified carnitine ratio
0.83 (0.82 c )
(DRIED BLOOD SPOT) c
< 0.3 (n = 42)
C8/C10 acylcarnitine ratio
> 5.1 b
URINARY ACYLCARNITINES c
GS/MS analysis of lactones
Acetylcarnitine as the major acylcarnitine
Acetyl, isobutyryl, butyryl, isovaleryl and 2-methyl butyryl- carnitine
Direct analysis of
acylcarnitines by FAB/MS
Acetylcarnitine as the major acylcarnitine
Acetyl, isobutyryl, butyryl, isovaleryl, decanoyl and 2-methylbutyrylcarnitine
- Biochemical determinations
Measurement of fatty acid oxidation rates in lymphocytes.
Control tested in the same run
Controls(n = 40)
Mitochondrial oxidations assayed
- by carbon dioxide production
4.20 ± 1.06[2.52-7.69]
3.53 ± 0.81[3.53-6.37]
- by carbon dioxide plus water
soluble material production
6.08 ± 1.03[4.28-8.51]
- by tritiated water formation
7.75 ± 1.73[4.97-11.20]
6.12 ± 1.28[4.00-9.20]
Major biochemical determinations performed on cultured skin fibroblasts from patient.
Mitochondrial oxidations assayed
- by carbon dioxide production
4.08 ± 0.71 (n = 20)
8.83 ± 1.69 (n = 20)
6.75 ± 2.08 (n = 20)
- by carbon dioxide plus water soluble material production
10.85 ± 2.60 (n = 20)
- by tritiated water formation
[9,10-3H]-myristic acid a
5.81 ± 2.27 (n = 76)
[9,10-3H]-myristic acid a , c
8.04 ± 1.74 (n = 20)
[9,10-3H]-palmitic acid d
9.39 ± 1.70 (n = 20)
(ETF as an electron acceptor)
1.3 ± 0.5 (n = 55)
1.7 ± 0.5 (n = 55)
1.0 ± 0.4 (n = 55)
346 ± 112 (n = 63)
78 ± 25 (n = 59)
C12/C4 activity ratio
0.24 ± 0.05 (n = 59)
99.5 ± 32.1 (n = 105)
81.8 ± 22.8 (n = 102)
C16/C4 activity ratio
0.86 ± 0.20 (n = 102)
20.64 ± 7.79 (n = 47)
acetoacetyl-CoA (no K+)
6.44 ± 3.46 (n = 60)
acetoacetyl-CoA (with K+)
13.40 ± 6.22 (n = 60)
activity ratio AA-CoA with
K+ on AA-CoA without K+
2.17 ± 0.59 (n = 60)
Succinyl-CoA Ketoacid Transferase
succinyl-CoA and acetoacetate
12.11 ± 3.60 (n = 25)
Type I (outer)
0.58 ± 0.26 (n = 12)
Type II (inner)
15.37 ± 3.13 (n = 8)
Cell membrane carnitine transport
0.83 10-3 ±0.25 10-3 (n = 8)
Residual MCAD activity studied by the various procedures was between 10 to 28% of control values and overall fatty acid oxidation rates were lowered to similar extents. The activities of other enzymes involved in mitochondrial β-oxidation, including enoyl-CoA hydratases, β-hydroxyacyl-CoA dehydrogenases and β-ketoacyl-CoA thiolases as well as the ketolysis enzyme succinyl-CoA ketoacid transferase, were in normal range values. The proteins involved in cellular utilization of carnitine and its esters, including carnitine palmitoyltransferase types I and II and the plasma membrane carnitine transporter(s) also exhibited normal activities in fibroblast preparations (Table 2).
De novo syntheses of acylcarnitines from deuterated palmitate
Our patient undoubtedly suffered from a deficiency of MCAD, presenting with a mild phenotype of the disease as ascertained by relatively high residual activity from lymphocytes and fibroblasts and by a low urinary excretion of hexanoylglycine and suberylgycine during metabolic decompensation. At the time of this urine analysis, acylglycines were determined by GC/MS (with a detection limit of 2 mmol/mol creatine) and could not be discriminated from control values. Better analytical detections of urinary acylglycines are obtained by GC/MS-MS or GC-MS stable-isotope dilution analysis (SID) of methyl esters, with detection limits less than 0.7-1 mmol/mol creatinine, allowing for upper limit of controls a clear cut-off value close to 1.1 mmol/mol [25, 41].
Biochemically, our patient resembled the four mild MCADD patients described by Zschocke et al.  who had a residual MCAD activity (10-20%) of the same order of magnitude as in our patient. In fact, these four cases and our patient all show intermediate (between controls and severe MCADD patients) values for both enzyme activities and acylcarnitine levels and ratios. The residual enzyme activity observed in classical MCADD, caused by homozygosity for c.985A>G, is usually below 1%. Two of the four patients previously described by Zschocke et al.  were homozygous for ACADM gene mutations (c.734C>T or c.799G>A [exon 9]) distinct from the c.985A>G mutation; the other two patients were compound heterozygous for the c.985A>G mutation in one allele and the c.199T>C (exon 3) mutation in the other ACADM allele. Genotypically, our patient resembled the latter two patients, with the c.985A>G mutation (exon 11) in one allele and a mutation in exon 3 (namely, c.145C>G mutation) in the other allele. This mutation has never been observed in controls. To our knowledge, this is the first report for the c.145 C>G mutation in the ACADM gene.
As a general rule, amino acid changes introduced in a mature protein affect its conformation and this may impact its final stability and function/activity. This has been well documented for the MCAD mutant protein (K304E) resulting from the c.985A>G mutation. The MCAD protein requires assembly of the monomers in a tetramer, which represents the active functional form of MCAD. In the case of monomers resulting from the wild-type ACADM gene, the MCAD tetramer is stable. In the case of K304E monomers, the tetramer dissociates abnormally rapidly , giving rise to a reduced steady-state concentration of the tetrameric form. Another contributing factor is impairment of intramitochondrial processes including altered monomer folding or management . Several studies indicate that protein misfolding is the key event in the loss of MCAD activity from many protein variants, and that overexpressing chaperonins may rescue monomers from aggregation and enhance residual MCAD activity (see  and references therein). As a result of protein misfolding, accelerated temperature-driven unfolding may affect MCAD protein variants. This abnormal MCAD loss of function and thermosensitivity first documented for the K304E variant, has been recently extended to a number of MCAD variants [18, 42], questioning the view that some of the missense mutations detected by newborn screening are less life-threatening than those clinically proven to be disease causing. In this respect, the relatively high residual activity found in our mild MCADD patient has not prevented the occurrence of a severe metabolic decompensation which might have been fatal in the absence of adequate medical management. A patient with the R28C mutant protein who had a mutation (c.157C>T), also less severe than the c.985A>G mutation, died unexpectedly in early childhood .
Our mild MCADD patient combines MCAD K304E and Q24E variant monomers. Conformational characteristics of the MCAD K304E variant have been repeatedly described in the literature. The amino acid change is located in the MCAD C terminal α domain which is involved in helix-helix interactions taking place in tetramer assembly (see  and references therein). As a result, tetramer assembly is compromised: unemployed monomers aggregate and are subjected to degradation. Experimental prevention of monomer aggregation by overexpressed chaperonins has been shown to result in increased tetramer assembly along with higher residual activity (see  and references therein).
The Q24E variant has not been previously described. The amino acid change here occurs in the MCAD N-terminal α domain. Some of the protein variants with mutations in this protein region may present with normal or close to normal enzyme activity [3, 18]. Mutations of this portion of the MCAD protein are also shown to induce moderate alterations in tetramer assembly and to disrupt thermal stability. This is the case for the Y42 H mutant protein for which temperature-driven loss of activity is greater than normal though lower than that of common K304E mutant protein . De novo synthesis of acylcarnitines monitored on whole blood samples from our patient was consistent with MCADD. The major acylcarnitine produced from deuterated palmitate was octanoylcarnitine, other medium-chain (hexanoyl- and decanoyl-) carnitine esters being also generated in excess. The C8 to C4 acylcarnitine production rate ratio was 54-fold that of controls. As a whole, profile and ratio of acyl-carnitine production rates in our mild MCADD patient resemble those found in patients with classical MCADD, indicating clearly functional repercussion of the enzyme defect on the disposal of acyl-CoA. The carnitine added to incubation media appeared to mobilize acyl-CoAs unmetabolised by β-oxidation and, by comparing acylcarnitines production rates to control values, revealed the level(s) at which β-oxidation was defective. The acylcarnitine production rates and increased C8/C4 acylcarnitine de novo synthesis ratio of our mild MCADD patient are clearly different from those of the adult carrier of the c.985A>G mutation (figure 2).
The last but not least issue concerns the carnitine status of our patient at the time of metabolic decompensation. The patient was then not receiving L-carnitine therapy and her systemic carnitine levels were below normal (Table 1). This chronic hypocarnitinaemia was concomitant with a low urinary excretion of hexanoylglycine and suberylglycine. Interestingly, no elevation of urinary suberylglycine was reported in the urine from one patient with hypocarnitinaemia in the description of four MCADD asymptomatic siblings (compound heterozygotes for the common c.985A>G and the c.842G>C ACADM gene mutations) provided by Albers and coworkers . Zschocke and coworkers on the other hand discussed elevated acylcarnitine and undetectable 5-hydroxyhexanoic acid and suberylglycine in their four mild MCADD patients . Patients with genotypes representing mild MCADD (high residual enzyme activity and low urinary levels of glycine conjugates) should get the same advice as patients with classical MCADD regarding risks associated with catabolic states and carnitine deficiency.
Written informed consent was obtained by mother of the patient for publication of this case report.
We thank the patient, their parents and laboratory volunteer controls for participating in this study. The authors gratefully acknowledge J.C. Vienne, I. Kumorek, F. Hottevart, A. Kerkove, Dr. M. Kouach and Pr. N. Porchet for their help in either technical assistance or valuable comments. This work was supported by grants from the French Ministère de la Santé (PHRC 2003R/1903) and FMO (Fédération des Maladies Orphelines).
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