Abstract
Inherited metabolic diseases account for about one third of pediatric patients with hepatomegaly, acute liver failure, cirrhosis or cholestasis. Specifically for pediatric acute liver failure, they account for 10–15% of cases, with a mortality of 22–65%. The percentage of acute liver failure caused by an inherited metabolic disease in children less than 2–3 years of age is even higher, ranging from a third to half of all cases. Metabolic liver disease accounts for 8–13% of all pediatric liver transplantations. Despite this high burden of disease, underdiagnosis remains common. We reviewed and updated the list of known metabolic etiologies associated with various types of metabolic liver involvement, and found 142 relevant inborn errors of metabolism. This represents the second of a series of articles attempting to create and maintain a comprehensive list of clinical and metabolic differential diagnoses according to system involvement.
Keywords: Metabolic liver disease, inborn errors of metabolism, inherited metabolic diseases, hepatomegaly, cholestasis, steatosis, fatty liver, cirrhosis, elevated liver enzymes, acute liver failure, hepatocellular carcinoma, hepatic adenomas
1. Introduction
This is the second in a series of articles that intends to provide a comprehensive list of inherited metabolic diseases associated with specific signs and symptoms. The list will follow the classification as included in the knowledge base of inborn errors of metabolism (IEMbase) [1] and in the recently proposed Nosology of inborn errors of metabolism (IEMs) [2]. The second issue of our series will be dedicated to metabolic liver disease (MLD).
Manifestations of liver involvement caused by inherited metabolic diseases are not uncommon. As can be seen in more detail in Table 1, they represent 10–15% of all causes of acute liver failure in children less than 18 years old, with a mortality of 22–65%. In children less than 2–3 years of age, the percentage of acute liver failure caused by MLD rises to 33–53%. Mitochondrial depletion syndromes alone accounted for 13% of acute liver failure in children younger than 2 years old (5/29) [3] and 22% in infants (11/50) [4]. The percentage of pediatric liver transplantation due to MLD, on the other hand, varies from 8% [5] to 10% (310/2,997, excluding cystic fibrosis and α−1 antitrypsin deficiency) [6] to 13% (73/575, excluding α−1 antitrypsin deficiency and neonatal hemochromatosis) [7].
Table 1.
Age | Metabolic liver disease (MLD) | MLD mortality | Indeterminate | Ref |
---|---|---|---|---|
<90 d | 28/148 (19%) | 29% | 56/148 (38%) | [8] |
<120 d | 28/78 (36%) | 8/28 (29%) | 5/78 (6%) | [9] |
Infants (<12 m) | 34/80 (43%) | 14/34 (41%) | 13/80 (16%) | [10] |
< 24 m (median 1.3 m) | 18/34 (53%) | 8/18 (44%) | - | [11] |
<2 y | 12/28 (43%) | 3/12 (25%) | 5/28 (18%) | [12] |
<3 y (median 12.5 m) | 10/30 (33%) | 7/10 (70%) | 3/30 (10%) | [13] |
<18 y | 14/109 (13%) | 8/14 (57%) | 16/109 (15%) | [14] |
0–18 y | 36/348 (10%) | 8/36 (22%) | 169/348 (49%) | [15] |
0–17 y | 15/97 (15%) | 11/17 (65%) | - | [16] |
Neonatal (<1 m) | 3/17 (18%)* | - | ||
Infants (1–12 m) | 7/22 (32%) | |||
Early childhood (1–5 y) | 3/33 (14%) | |||
Late childhood (5–17 y) | 2/36 (6%)** | |||
0–18 y | 25/215 (12%) | - | 68/215 (32%) | [17] |
Neonatal (<28 d) | 5/42 (12%) | 2/42 (5%) | ||
Infants (29 d-1 y) | 3/23 (13%) | 8/23 (35%) | ||
Child (1–12 y) | 12/95 (13%) | 41/95 (43%) | ||
Adolescent (12–18 y) | 5/55 (9%) | 17/55 (31%) |
excluding neonatal hemochromatosis;
both Wilson disease.
In a cohort of 493 patients seen at a specialty hospital for pediatric liver and biliary diseases, 29.6% (146 patients, excluding one with cystic fibrosis) had a metabolic etiology [18]. Specifically, a metabolic etiology accounted for cirrhosis in 21% of cases (54/260) and cholestasis in 28% of cases (25/89). Another cohort found that 2.5% (11/450) of cases of infantile cholestasis are caused by mitochondrial depletion syndromes [4].
With increased attention for IEMs in adults, increasing numbers of children with IEMs becoming adults, and increasing availability of high throughput genetic diagnostics, the expectation is that many ‘cryptogenic’ cirrhosis cases in adults and many hitherto unexplained adult cases of acute liver failure (ALF) will receive metabolic diagnoses. Indeed, end-stage liver disease secondary to cryptogenic cirrhosis is the indication for orthotopic liver transplantation (OLT) in 7% to 14% of recipients [19], whereas a specific etiology cannot be identified in 15% of adult ALF cases [20].
2. Signs and symptoms
We categorized the signs and symptoms of MLD as: hepatomegaly; hepatocellular disease with either elevation of transaminases or frank acute liver failure; cholestasis; steatosis; fibrosis or cirrhosis; and liver tumors (see Supplemental Table 1, also available at www.iembase.org/gamuts).
The definition of acute liver failure differs between adults and children and varies in different publications. In adults, acute liver failure is defined by a combination of jaundice, hepatic encephalopathy and clotting abnormalities. In contrast, encephalopathy is not required to make the diagnosis of acute liver failure in children, as it is more difficult to assess. Although no formal definition of liver failure exists in children, the entry criteria for the Pediatric Acute Liver Failure (PALF) study are commonly used, those being a hepatic-based coagulopathy with a prothrombin time (PT) ≥ 15 seconds or international normalized ratio (INR) ≥ 1.5 not corrected by vitamin K in the presence of clinical hepatic encephalopathy, or a PT ≥ 20 seconds or INR ≥ 2.0 regardless of the presence or absence of clinical hepatic encephalopathy [15]. Lack of correction by vitamin K is defined as persistent coagulopathy six hours after a second dose of parenteral vitamin K [13]. The fact that the coagulopathy has a hepatic etiology requires biochemical evidence of liver injury, generally as elevated aspartate aminotransferase (AST), alanine aminotransferase (ALT), and/or total and conjugated bilirubin [21]. Acute or fulminant is defined as onset of liver failure within eight weeks of onset of clinical liver disease, in a patient with no previous evidence of chronic liver disease; onset within six months is sometimes called subacute or subfulminant liver failure [21].
Supplemental Table 1 summarizes in detail IEMs, including diagnostic markers, associated with liver involvement. Hepatocellular disease was included as either acute liver failure, or as elevation of transaminases in cases where a formal definition of acute liver failure is not always appropriate (such as in cases with previous evidence of chronic liver disease, or with onset of liver failure beyond eight weeks of onset of liver disease). Where ‘steatosis’ is mentioned, this can be radiological or pathological steatosis.
3. Diagnosis and differential diagnosis
It is likely that metabolic etiologies of acute liver failure remain underdiagnosed. In a cohort of 329 patients with indeterminate pediatric acute liver failure, 179 (54%) had no testing for common metabolic disorders [22]. Depending on age, 55.9–87.5% and 33.8–56.9% of patients had no acylcarnitine profile or urine organic acid analysis performed, respectively. In 53 infants younger than 3 months of age, only 57% had screening for tyrosinemia, and 52% had screening for galactosemia [22].
Some clinical and laboratory features are known to increase the likelihood of MLD as compared to other diagnoses. There is a significant difference in the median jaundice-to-encephalopathy interval (60 days vs 15 days) and glycemia (p = 0.001), with a longer interval and a higher chance of hypoglycemia in patients with MLD. Other highly discriminating parameters were a suggestive family history, with an odds ratio (OR) of 3.73, developmental delay (OR 4.4), and presence of diarrhea or vomiting (OR 3.28) The family history was considered suggestive of MLD when there was consanguinity, neonatal deaths/sudden infant death syndrome in the family, unknown deaths in siblings, or a similar history in the family [13]. In a cohort of children younger than 2 years old with acute liver failure, failure to thrive and/or vomiting were more frequent in patients with MLD (p = 0.022) [12].
Red flags suggesting that liver involvement might be caused by an IEM include: 1) a suggestive family history, such as recurrent miscarriages, neonatal deaths, sudden infant death syndrome (SIDS), psychiatric illness, parental consanguinity, acute fatty liver of pregnancy or HELLP syndrome; 2) recurrent presentation during episodes of catabolism, such as febrile illness or prolonged fasting; 3) recurrent or chronic vomiting or diarrhea; 4) failure to thrive; 5) presence of dysmorphic features; 6) food aversion; 7) unusual fluid odors; and 8) evidence of systemic involvement, such as developmental delay, hypotonia, seizures, cataracts, optic atrophy or renal tubular involvement [18].
The age of onset of symptoms can also represent a helpful diagnostic clue. Causes of acute liver failure in young infants include galactosemia, tyrosinemia, mitochondrial depletion syndromes, congenital disorders of glycosylation, and Niemann-Pick type C. Hereditary fructose intolerance becomes more prevalent after 4–6 months of age, when fructose-containing foods are introduced at the time of weaning from breast milk. However, it can present at any age, even in the neonatal period, as many infant formulas contain fructogenic compounds [23]. The fructose and sucrose content of commercially available infant formulas has been reviewed elsewhere [24]. Wilson disease remains the most common metabolic cause of acute liver failure in late childhood and adolescence. Mitochondrial disorders [25], fatty acid oxidation defects and urea cycle disorders can present at any age. Other IEMs can manifest by recurrent liver failure with intercurrent illness, such as long-chain fatty acid oxidation defects, and dihydrolipoamide dehydrogenase (E3) deficiency [26].
Some conditions are not uniformly considered as IEMs in a strict sense, but present great phenotypic overlap. Examples include intracellular trafficking defects such as NBAS [27], and SCYL1 [28,29] deficiencies, and cytosolic tRNA synthetase deficiencies such as LARS [30,31], MARS [32], and IARS [33] deficiencies, all of which can present with infantile hepatopathy, including recurrent liver failure. Other trafficking defects, such as VPS33B and VIPAS39 deficiencies, can present with hepatopathy and proximal renal tubular involvement [34,35]. Some of them might even be amenable to therapy, as has been described with high-protein intake in cases of liver failure from LARS deficiency [36], or zinc supplementation in a case with IARS deficiency [33]. Phenotypic overlap exists not only with other genetic disorders, but also with non-genetic conditions. For example, neonatal hemochromatosis is most commonly caused by gestational alloimmune liver disease (GALD), where the mother produces antibodies against fetal hepatocytes [37]. However, a diagnosis of deoxyguanosine kinase deficiency should be entertained in the differential diagnosis of neonatal hemochromatosis [38–40]. In fact, in a case series of 22 patients diagnosed with neonatal hemochromatosis, 1 (5%) was found to have deoxyguanosine kinase deficiency [41].
A few laboratory diagnostic pearls are presented as follows:
Patients with liver failure from tyrosinemia type 1 can have normal or near normal transaminases [9,42].
A low alkaline phosphatase to total bilirubin ratio (ALP/TB ratio) and a high AST/ALT ratio (De Ritis ratio) in the setting of acute liver failure point to Wilson disease as the underlying etiology. An ALP/TB ratio < 4 had a sensitivity of 94%, specificity of 96%, and likelihood ratio of 23, while an AST/ALT ratio > 2.2 had a sensitivity of 94%, specificity of 86%, and likelihood ratio of 7 for diagnosing fulminant Wilson disease. Combining both ratios had a diagnostic sensitivity and specificity of 100% [43]. Sometimes even more stringent ratio cutoffs are used, with an ALP/TB ratio <2 and AST/ALT ratio > 4.0 [44]. A combination of acute liver failure with Coombs negative hemolysis (partly responsible for the skewed ALP/TB ratio) and/or tubulopathy (glucosuria, amino-aciduria, phosphaturia) also points to Wilson.
Normal complex II (encoded exclusively by nuclear genes) activity in combination with reduced complex I, III and IV activities should raise suspicion for mitochondrial depletion syndrome [45].
The preferred screening method for mitochondrial depletion syndrome is by DNA sequencing, as liver mitochondrial DNA content analysis can reveal secondarily low mitochondrial DNA copy number in the setting of acute liver failure from other etiologies [3].
A normal γ-glutamyl transferase GGT in the setting of cholestasis indicates a disorder of bile acid synthesis, bile acid transport, or intracellular trafficking. GGT is located in the luminal side of the plasma membrane of bile duct epithelial cells. In most cases of cholestasis, the increased availability of bile acids in the lumen of the bile ducts will facilitate the detachment of the GGT from the canalicular membrane. Thus, disorders of bile acid synthesis [46] and of bile acid transport (ATP8B1 and ABCB11 deficiencies) [47] are associated with a low or normal GGT. Similarly, disorders of intracellular trafficking such as SCYL1 deficiency [29], ARC syndrome [34] due to VPS33B or VIPAS39 deficiencies, and MYO5B deficiency [48,49] can also be associated with cholestasis with normal GGT, likely due to mislocalization of a bile acid transporter [49,50].
The interval between presentation of acute liver failure and the need to decide whether or not to transplant is still too short to allow extensive genetic testing, although requests for sequencing panels, whole exome sequencing, and even whole genome sequencing are becoming more frequent. The advent of broader availability and better reliability of high-throughput genetic diagnostic options will no doubt revolutionize the field, expanding the phenotypic and biochemical spectrum of the involved disease entities, identifying genetic causes in the high percentage of unsolved acute and chronic, pediatric and adult liver disease patients. Nevertheless, the need for clinical and biochemical corroboration or confirmation of the identified genetic variants will remain.
A list of laboratory investigations to aid in the diagnosis of the various listed IEM is summarized in Table 2. For more details see Supplemental Table 1. The diagnostic approach, as with all IEMs, should focus on treatable disorders.
Table 2.
Chemistry | Profiles | Special tests |
---|---|---|
Blood count | Amino acids (P, U) | Copper (S, U) |
Coagulation factors | Organic acids (U) | Ceruloplasmin (S) |
Urinalysis* | Acylcarnitines (DBS, P) | LS-Enzymes (DBS) |
Lipid panel (S) | Porphyrins (U, P, RBC) | Alpha-fetoprotein (S) |
Ammonia (B) | VLCFA (P) | SAH & SAM (P) |
Glucose (P) | Sialotransferrins (S) | Sulfatides (U) |
Lactate (P, CSF) | Purines (U) | Vitamins A, D, E, K (S) |
Total/direct bilirubin (S) | Oligosaccharide (U) | Galactose-1-P (RBC) |
Iron (S) | Bile acids (S, U) | Manganese (B) |
Ferritin (S) | Sterols (P) | |
AST/ALT (P) | ||
GGT (P) | ||
ALP (P) | ||
CK (P) |
Dipstick urine chemistry
4. Treatment
Some IEMs can be cured by a liver transplantation, while for others, significant metabolic impairment will persist after transplantation (reviewed in detail in [51]). For the latter group, in particular, the benefits and drawbacks of this treatment approach should be evaluated on an individual basis. Recently, the traditional exclusion of patients mitochondrial disease from liver transplantation is being reassessed [52]. With this caveat, the reported patient survival at 5 years varies from 88.9–92%, and the graft survival at 5 years is 83.8% for cases of pediatric liver transplantation due to IEMs [53]. In fact, children with IEMs who receive a liver transplant are less likely to experience gastrointestinal complications, portal vein thrombosis, and surgical re-intervention within 30 days post-transplant, with an excellent patient survival and better graft survival than those who were transplanted for other indications [6]. In the case of Wilson disease, a scoring system exists based on serum bilirubin, AST, INR, WBC and albumin at presentation, with a cutoff score of 11 points as an indication for liver transplantation [54].
Supplemental table 1 includes information on primary treatment options for the mentioned IEMs, i.e., treatment that addresses at least one aspect of the pathophysiology of the disease, when available.
5. Conclusion
We provide a comprehensive list of metabolic diseases associated with liver involvement, as well as a proposed battery of standard laboratory and biochemical tests to aid in diagnosis based on the many possible IEMs in the aforementioned list. This represents the second issue in a series of educational summaries providing a comprehensive and updated list of metabolic differential diagnosis according to system involvement. The full list can be accessed for free at www.iembase.org/gamuts, and will be curated and updated on a regular basis.
Supplementary Material
Highlights.
We found 142 inherited metabolic diseases associated with various types of liver involvement, and provide a list of laboratory tests to consider to aid in the diagnosis of these diseases.
This represents the second issue in a series of educational summaries providing a comprehensive and updated list of metabolic differential diagnosis according to system involvement.
This list will be curated and updated on a continual basis in the IEMbase website.
Footnotes
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Declarations of interest: none
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