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Hepatoerythropoietic Porphyria Misdiagnosed as Child Abuse:  Cutaneous, Arthritic, and Hematologic Manifestations in Siblings With a Novel UROD Mutation FREE

Julie L. Cantatore-Francis, MD; Jessica Cohen-Pfeffer, MD; Manisha Balwani, MD; Philip Kahn, MD; Herbert M. Lazarus, MD; Robert J. Desnick, MD, PhD; Julie V. Schaffer, MD
[+] Author Affiliations

Author Affiliations: Departments of Dermatology (Drs Cantatore-Francis and Schaffer) and Pediatrics (Drs Kahn, Lazarus, and Schaffer), New York University School of Medicine, and Department of Genetics and Genomic Sciences, Mount Sinai School of Medicine (Drs Cohen-Pfeffer, Balwani, and Desnick), New York, New York.


Arch Dermatol. 2010;146(5):529-533. doi:10.1001/archdermatol.2010.89.
Text Size: A A A
Published online

ABSTRACT

Background  Hepatoerythropoietic porphyria (HEP) is a rare autosomal recessive disorder resulting from the markedly deficient, but not absent, activity of the heme biosynthetic enzyme uroporphyrinogen decarboxylase (UROD). The disorder typically manifests during infancy or early childhood with extreme photosensitivity, skin fragility in sun-exposed areas, hypertrichosis, erythrodontia, and pink urine.

Observations  Three siblings, offspring of parents of Puerto Rican and Dominican descent, had with excessive scarring on the face and dorsal aspect of the forearms, which initially led to the erroneous suspicion of child abuse. Although these lesions were photodistributed, overt photosensitivity had not been observed, with the exception of a single episode of blistering and onycholysis after intense sun exposure in 1 affected child. Mild facial hypertrichosis, chronic anemia, polyarticular arthritis, and developmental delay represented additional findings. Biochemical studies of urine, plasma, and erythrocyte porphyrins from the affected siblings established the diagnosis of HEP. Sequencing of the UROD gene revealed compound heterozygosity for a novel missense mutation, V166A, and a complex deletion/insertion, 645del1053ins10.

Conclusions  Our report expands the phenotypic and genotypic spectrum of HEP, highlighting mild cutaneous presentations that can occur without obvious photosensitivity and masquerade as child abuse.

Figures in this Article

Hepatoerythropoietic porphyria (HEP), a rare autosomal recessive disorder of heme biosynthesis, results from markedly deficient, but not absent, activity of the heme biosynthetic enzyme uroporphyrinogen decarboxylase (UROD) due to mutations in the UROD gene (OMIM +176100).15 Hepatoerythropoietic porphyria is the recessive form of familial porphyria cutanea tarda (PCT), an autosomal dominant condition in which heterozygous UROD mutations predispose carriers to clinical manifestations.1,2 Since the initial description of HEP in 1969,6 there have been approximately 40 reported cases.2,734 Clinical manifestations usually develop during infancy or early childhood and include extreme photosensitivity, skin fragility (eg, bullae, erosions, and scarring) in sun-exposed areas, hypertrichosis, erythrodontia, and pink to red urine. Sclerodermoid skin changes often become evident over time. Compared with PCT, the cutaneous features of HEP typically have earlier onset, increased severity leading to disfigurement, and closer resemblance to those in congenital erythropoietic porphyria (CEP or Günther disease).4,5 However, extracutaneous findings, including hemolytic anemia, are more frequent and severe in CEP than in HEP.4,5,30

Herein we describe 3 siblings with HEP who presented with mild cutaneous findings that led to a child abuse investigation. They also had chronic hemolytic anemia and other extracutaneous manifestations not previously recognized as features of HEP, including arthritis, developmental delay, and neonatal thrombocytopenia. Sequencing of the UROD gene revealed a novel missense mutation and a complex deletion/insertion in the affected siblings. This kindred highlights the importance of recognizing mild cutaneous presentations of HEP, which may occur without obvious photosensitivity, and extends the phenotypic spectrum of the disease.

REPORT OF A CASE

The proband, a 7-year-old girl who was the third child of a Puerto Rican mother and a Dominican father, had a 2-month history of blistering, erosions, and scarring on the dorsal aspect of the hands and forearms and shedding of her fingernails. These findings developed after intense summer sun exposure. She took no medications and had not previously exhibited photosensitivity, although facial scarring had appeared after minor trauma. The patient had a history of severe neonatal thrombocytopenia requiring a platelet transfusion, chronic hemolytic anemia, and chronic reddish brown urine. Her growth was normal, but she was developmentally delayed, including a receptive and expressive speech disorder and poor coordination resulting in an abnormal gait; she had been evaluated by a neurologist and received speech, physical, and occupational therapy since infancy.

Physical examination results showed linear-to-polygonal scars and mottled hyperpigmentation on the face, dorsal aspect of the hands, and extensor forearms. She had mild facial hypertrichosis, brownish teeth, and no evidence of hepatosplenomegaly. Two of the patient's 4 siblings had similar cutaneous and extracutaneous findings, including chronic anemia and developmental delay (Table 1). The children's cutaneous findings are shown in the Figure. Although both affected siblings were older (a brother aged 11 years and a sister aged 10 years), neither had exhibited photosensitivity. However, multiple round, linear, and geometric scars in all 3 affected siblings had led to a year-long child abuse investigation by state authorities, which was initiated by teachers, school nurses, and emergency department physicians. The unaffected siblings (a brother aged 5 years and a sister aged 3 years) had no history of photosensitivity, other skin findings, anemia, or developmental delay. With the exception of photosensitivity, these features had manifested in the affected siblings during the first years of life. The parents were nonconsanguineous and unaffected, although the mother tended to sunburn easily.

Place holder to copy figure label and caption
Figure.

Cutaneous findings in a kindred with hepatoerythropoietic porphyria. Patients include the proband (A, E, and G), her 10-year-old sister (B, C, and F), and her 11-year-old brother (D). Linear and geometric hyperpigmented macules are evident on their faces (A-D) and the dorsal aspect of their hands (E and F). Polygonal to round hypopigmented scars are also present in these sites (A, E, and F), and scars on the forearm resemble cigarette burns (G). Facial hypertrichosis is apparent (A-D).

Graphic Jump Location
Table Graphic Jump LocationTable 1. Summary of Clinical Findings for the Proband and Her Family

Results of biochemical studies in the affected siblings were diagnostic of HEP. These included markedly elevated urine porphyrin levels (predominantly uroporphyrin I/III and heptacarboxyl porphyrins), a plasma porphyrin fluorescence peak at 620 nm, increased erythrocyte zinc protoporphyrin levels, and decreased erythrocyte UROD activities (Table 2). Sequencing of the UROD gene in the affected siblings revealed compound heterozygosity for 2 UROD mutant alleles. A previously reported complex deletion/insertion, 645del1053ins10, inherited from their mother, predicted truncation of the UROD enzyme's 367–amino acid sequence at residue 198. A novel missense mutation, a T-to-C transition at position 497, inherited from their father, predicted a valine-to-alanine substitution at amino acid residue 166 (V166A). The 2 unaffected siblings were heterozygous for V166A. Neither of the mutations was identified in 100 healthy individuals.

Table Graphic Jump LocationTable 2. Summary of Laboratory Findings for the Proband and Her Familya

Analysis of the hemochromatosis (HFE) gene showed heterozygosity for the H63D mutation in the proband and her affected sister, both of whom had elevated serum ferritin levels (Table 2) and relatively pronounced skin fragility. Levels of vitamin B12 and folate and liver chemistry results were normal, and results of viral hepatitis screens were negative in all family members. Magnetic resonance imaging studies of the brain in the affected children were normal.

A year after diagnosis, the proband and her older affected sister simultaneously developed pain, swelling, and limited range of motion in the interphalangeal and metacarpophalangeal joints and wrists of both hands; magnetic resonance imaging confirmed the presence of synovitis. Mild cutaneous sclerosis and tapering of the fingertips were noted. Results of a study for rheumatoid factor were negative in both girls, and the older sister had antinuclear antibodies (titer, 1:320) with a speckled pattern.

COMMENT

Most patients with HEP develop photosensitive eruptions during infancy or early childhood. Sun-induced erythema and blistering occurred by 2 years of age in 76% of reported cases (25 of 33 patients with available data).2,69,1116,1924,2634 Spontaneous improvement of acute photosensitivity during later childhood, but persistent skin fragility, has been described.8,11,29,33 Other patients have presented in the second or third decade of life with mild skin fragility or photodistributed annular plaques.26,28,30,33 Photomutilation can result in considerable morbidity in patients with HEP via impaired function of the hands and facial disfigurement, making photoprotection essential.4,5 Although helpful in PCT, phlebotomy and antimalarials are generally ineffective in HEP.5,35

The primary cutaneous manifestations in our kindred were fragility, scarring, and hyperpigmentation during childhood rather than acute photosensitivity. Round erosions and scars resembled cigarette burns, whereas linear and geometric lesions suggested forceful use of other instruments. The presence of multiple wounds in different stages of healing, the lack of an explanation for the injuries, and their occurrence in several siblings were additional features suggestive of child abuse.36 These skin findings had initially led to a long investigation by child protective services that resulted in considerable distress to the family.

More than 40 UROD mutations have been described, some occurring in both HEP and familial PCT.32,34 To date, 15 missense mutations, 2 deletions, and 1 nonsense mutation have been reported in HEP.3,5,17,18,21,25,26,29,30,3234 Homozygosity for the F46L missense mutation causes relatively mild HEP,29,30 as may be true of the novel V166A mutation in our family. In contrast, mutations that abolish UROD activity, like the 645del1053ins10 lesion in our family, are only compatible with life when the individual's other UROD allele encodes residual enzymatic activity.5 The 645del1053ins10 mutation was previously described in an Argentinean kindred with PCT.37 Our 3 affected siblings had the same UROD mutations, but the severity of their clinical manifestations varied, underscoring the role of environmental and genetic modifiers. Our proband and her most severely affected sibling were heterozygous for the HFE H63D mutation and had increased serum ferritin levels, which may have contributed to their clinical presentations. Severe cutaneous findings, a HFE H63D mutation, and elevated ferritin levels were recently described in a 2-year-old boy with HEP.32

Sclerodactyly, osteolysis and shortening of the phalanges, and progressive joint deformities can occur as components of acral photomutilation in patients with HEP, CEP, and homozygous variegate porphyria.4,5,10,13,19,35,38 To our knowledge, arthritis has not been previously reported in patients with HEP. Whether our 2 sisters' painful polyarticular arthritis represents a typical (but heretofore unrecognized) inflammatory precedent of joint deformity in HEP or an idiosyncratic inflammatory process, perhaps triggered by porphyrin deposition together with exposure to UV light or another environmental insult, remains to be determined.

Anemia was present in more than 50% of patients with HEP for whom hematologic status was reported (15 of 27),2,616,1922,26,28,30,32,33 but severe anemia requiring transfusions or administration of epoetin alfa has been observed in only a few individuals.28 The affected children in our family all had chronic anemia and were followed by a hematologist for years before the diagnosis of HEP, emphasizing the importance of recognizing anemia as a feature of HEP. Thrombocytopenia, often due to secondary hypersplenism, has been described in patients with CEP (including neonates) but not in those with HEP.3941

In contrast to the autosomal recessive form of variegate porphyria, which is characterized by developmental delay and seizures,38 neurological abnormalities are not typically associated with HEP or CEP.4,5,39 Nevertheless, developmental delay and seizures have been previously reported in HEP.22,27 A 4-year-old boy had delayed speech and language skills and subsequently had focal seizures and acute left hemiparesis.22 Two young adults with severe HEP, aged 21 and 23 years, developed generalized seizures and had neuroimaging evidence of cerebral cortical atrophy and punctate calcifications in the frontal lobes, presumably related to hypoxic injury as in other porphyrias.27 These observations, together with our affected siblings' developmental delay, support neurological assessment of HEP patients to better define this possible manifestation.

In summary, this report expands the clinical features of HEP to potentially include arthritis, neonatal thrombocytopenia, and developmental delay. The mutations identified in our kindred add to the UROD alleles that can cause HEP. We emphasize the importance of considering HEP in children who have skin fragility and scarring in sun-exposed sites, even in the absence of acute photosensitivity. Increased awareness of the clinical manifestations of HEP will allow recognition of more affected individuals, delineation of the phenotypic spectrum, and evaluation of future therapies.42

ARTICLE INFORMATION

Correspondence: Julie V. Schaffer, MD, Department of Dermatology, New York University School of Medicine, 560 First Ave, Room H-100, New York, NY 10016 (julie.schaffer@nyumc.org).

Accepted for Publication: October 30, 2009.

Author Contributions: Dr Schaffer had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Cantatore-Francis, Balwani, Desnick, and Schaffer. Acquisition of data: Cantatore-Francis, Cohen-Pfeffer, Balwani, Kahn, Lazarus, Desnick, and Schaffer. Analysis and interpretation of data: Cantatore-Francis, Cohen-Pfeffer, Balwani, Kahn, Lazarus, Desnick, and Schaffer. Drafting of the manuscript: Cantatore-Francis and Schaffer. Critical revision of the manuscript for important intellectual content: Cohen-Pfeffer, Balwani, Kahn, Lazarus, Desnick, and Schaffer. Obtained funding: Balwani, Desnick, and Schaffer. Administrative, technical, and material support: Balwani, Desnick, and Schaffer. Study supervision: Balwani, Desnick, and Schaffer.

Financial Disclosure: None reported.

Funding/Support: This study was supported in part by a grant from the Protect the Future Program of the American Porphyria Foundation (Dr Balwani), research grant R37 DK34045 from the National Institutes of Health (Dr Desnick), and a Medical Dermatology Career Development Award from the Dermatology Foundation (Dr Schaffer).

Role of the Sponsors: The sponsors had no role in the design and conduct of the study; in the collection, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.

Additional Contributions: Analysis of urine, plasma, and erythrocyte porphyrin levels and erythrocyte uroporphyrinogen decarboxylase activity was performed by Karl E. Anderson, MD, at the Porphyria Laboratory of The University of Texas Medical Branch, Galveston.

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de Verneuil  HBeaumont  CDeybach  JCNordmann  YSfar  ZKastally  R Enzymatic and immunological studies of uroporphyrinogen decarboxylase in familial porphyria cutanea tarda and hepatoerythropoietic porphyria. Am J Hum Genet 1984;36 (3) 613- 622
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de Verneuil  HGrandchamp  BBeaumont  CPicat  CNordmann  Y Uroporphyrinogen decarboxylase structural mutant (Gly281—Glu) in a case of porphyria. Science 1986;234 (4777) 732- 734
PubMed Link to Article
Smith  SG Hepatoerythropoietic porphyria. Semin Dermatol 1986;5 (2) 125- 137
Elder  GH Hepatic porphyrias in children. J Inherit Metab Dis 1997;20 (2) 237- 246
PubMed Link to Article
Aguadé  JPCastells  AIndacochea  ARodés  J A case of biochemically unclassifiable hepatic porphyria. Br J Dermatol 1969;81 (4) 270- 275
PubMed Link to Article
Piñol Aguadé  JHerrero  CAlmeida  J  et al.  Hepato-erythrocytic porphyria: a new type of porphyria [in French]. Ann Dermatol Syphiligr (Paris) 1975;102 (2) 129- 136
PubMed
Gunther  WW The porphyrias and erythropoietic protoporphyria: an unusual case. Australas J Dermatol 1967;9 (1) 23- 30
PubMed Link to Article
Hofstad  FSeip  MEriksen  L Congenital erythropoietic porphyria with a hitherto undescribed porphyrin pattern. Acta Paediatr Scand 1973;62 (4) 380- 384
PubMed Link to Article
Simon  NBerkó  GSchneider  I Hepato-erythropoietic porphyria presenting as scleroderma and acrosclerosis in a sibling pair. Br J Dermatol 1977;96 (6) 663- 668
PubMed Link to Article
Czarnecki  DB Hepatoerythropoietic porphyria. Arch Dermatol 1980;116 (3) 307- 311
PubMed Link to Article
Ippen  HFuchs  T Congenital porphyria. Clin Haematol 1980;9 (2) 323- 344
PubMed
Day  RSStrauss  PC Severe cutaneous porphyria in a 12-year-old boy: hepatoerythropoietic or symptomatic porphyria? Arch Dermatol 1982;118 (9) 663- 667
PubMed Link to Article
Lim  HWPoh-Fitzpatrick  MB Hepatoerythropoietic porphyria: a variant of childhood-onset porphyria cutanea tarda: porphyrin profiles and enzymatic studies of two cases in a family. J Am Acad Dermatol 1984;11 (6) 1103- 1111
PubMed Link to Article
Lazaro  Pde Salamanca  REElder  GHVillaseca  MLChinarro  SJaqueti  G Is hepatoerythropoietic porphyria a homozygous form of porphyria cutanea tarda? inheritance of uroporphyrinogen decarboxylase deficiency in a Spanish family. Br J Dermatol 1984;110 (5) 613- 617
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Bundino  STopi  GCZina  AMD’Allessandro Gandolfo  L Hepatoerythropoietic porphyria. Pediatr Dermatol 1987;4 (3) 229- 233
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PubMed

Figures

Place holder to copy figure label and caption
Figure.

Cutaneous findings in a kindred with hepatoerythropoietic porphyria. Patients include the proband (A, E, and G), her 10-year-old sister (B, C, and F), and her 11-year-old brother (D). Linear and geometric hyperpigmented macules are evident on their faces (A-D) and the dorsal aspect of their hands (E and F). Polygonal to round hypopigmented scars are also present in these sites (A, E, and F), and scars on the forearm resemble cigarette burns (G). Facial hypertrichosis is apparent (A-D).

Graphic Jump Location

Tables

Table Graphic Jump LocationTable 1. Summary of Clinical Findings for the Proband and Her Family
Table Graphic Jump LocationTable 2. Summary of Laboratory Findings for the Proband and Her Familya

References

Anderson  KESassa  SBishop  DFDesnick  RJ Disorders of heme biosynthesis: X-linked sideroblastic anemia and the porphyrias. InScriver  CSBeaudet  ALSly  WSValle  Deds.The Metabolic and Molecular Bases of Inherited Disease.8th ed. New York, NY McGraw-Hill2001;2961- 3062
de Verneuil  HBeaumont  CDeybach  JCNordmann  YSfar  ZKastally  R Enzymatic and immunological studies of uroporphyrinogen decarboxylase in familial porphyria cutanea tarda and hepatoerythropoietic porphyria. Am J Hum Genet 1984;36 (3) 613- 622
PubMed
de Verneuil  HGrandchamp  BBeaumont  CPicat  CNordmann  Y Uroporphyrinogen decarboxylase structural mutant (Gly281—Glu) in a case of porphyria. Science 1986;234 (4777) 732- 734
PubMed Link to Article
Smith  SG Hepatoerythropoietic porphyria. Semin Dermatol 1986;5 (2) 125- 137
Elder  GH Hepatic porphyrias in children. J Inherit Metab Dis 1997;20 (2) 237- 246
PubMed Link to Article
Aguadé  JPCastells  AIndacochea  ARodés  J A case of biochemically unclassifiable hepatic porphyria. Br J Dermatol 1969;81 (4) 270- 275
PubMed Link to Article
Piñol Aguadé  JHerrero  CAlmeida  J  et al.  Hepato-erythrocytic porphyria: a new type of porphyria [in French]. Ann Dermatol Syphiligr (Paris) 1975;102 (2) 129- 136
PubMed
Gunther  WW The porphyrias and erythropoietic protoporphyria: an unusual case. Australas J Dermatol 1967;9 (1) 23- 30
PubMed Link to Article
Hofstad  FSeip  MEriksen  L Congenital erythropoietic porphyria with a hitherto undescribed porphyrin pattern. Acta Paediatr Scand 1973;62 (4) 380- 384
PubMed Link to Article
Simon  NBerkó  GSchneider  I Hepato-erythropoietic porphyria presenting as scleroderma and acrosclerosis in a sibling pair. Br J Dermatol 1977;96 (6) 663- 668
PubMed Link to Article
Czarnecki  DB Hepatoerythropoietic porphyria. Arch Dermatol 1980;116 (3) 307- 311
PubMed Link to Article
Ippen  HFuchs  T Congenital porphyria. Clin Haematol 1980;9 (2) 323- 344
PubMed
Day  RSStrauss  PC Severe cutaneous porphyria in a 12-year-old boy: hepatoerythropoietic or symptomatic porphyria? Arch Dermatol 1982;118 (9) 663- 667
PubMed Link to Article
Lim  HWPoh-Fitzpatrick  MB Hepatoerythropoietic porphyria: a variant of childhood-onset porphyria cutanea tarda: porphyrin profiles and enzymatic studies of two cases in a family. J Am Acad Dermatol 1984;11 (6) 1103- 1111
PubMed Link to Article
Lazaro  Pde Salamanca  REElder  GHVillaseca  MLChinarro  SJaqueti  G Is hepatoerythropoietic porphyria a homozygous form of porphyria cutanea tarda? inheritance of uroporphyrinogen decarboxylase deficiency in a Spanish family. Br J Dermatol 1984;110 (5) 613- 617
PubMed Link to Article
Bundino  STopi  GCZina  AMD’Allessandro Gandolfo  L Hepatoerythropoietic porphyria. Pediatr Dermatol 1987;4 (3) 229- 233
PubMed Link to Article
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