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2016 ; 63
(6
): 1977-86
Nephropedia Template TP
Vilarinho S
; Sari S
; Yilmaz G
; Stiegler AL
; Boggon TJ
; Jain D
; Akyol G
; Dalgic B
; Günel M
; Lifton RP
Hepatology
2016[Jun]; 63
(6
): 1977-86
PMID26874653
show ga
Despite advances in the diagnosis and management of idiopathic noncirrhotic
portal hypertension, its pathogenesis remains elusive. Insight may be gained from
study of early-onset familial idiopathic noncirrhotic portal hypertension, in
which Mendelian mutations may account for disease. We performed exome sequencing
of eight subjects from six kindreds with onset of portal hypertension of
indeterminate etiology during infancy or childhood. Three subjects from two
consanguineous families shared the identical rare homozygous p.N46S mutation in
DGUOK, a deoxyguanosine kinase required for mitochondrial DNA replication;
haplotype sharing demonstrated that the mutation in the two families was
inherited from a remote common ancestor. All three affected subjects had stable
portal hypertension with noncirrhotic liver disease for 6-16 years of follow-up.
This mutation impairs adenosine triphosphate binding and reduces catalytic
activity. Loss-of-function mutations in DGUOK have previously been implicated in
cirrhosis and liver failure but not in isolated portal hypertension.
Interestingly, treatment of patients with human immunodeficiency viral infection
with the nucleoside analogue didanosine is known to cause portal hypertension in
a subset of patients and lowers deoxyguanosine kinase levels in vitro; the
current findings implicate these effects on deoxyguanosine kinase in the causal
mechanism. CONCLUSION: Our findings provide new insight into the mechanisms
mediating inherited and acquired noncirrhotic portal hypertension, expand the
phenotypic spectrum of DGUOK deficiency, and provide a new genetic test for a
specific cause of idiopathic noncirrhotic portal hypertension. (Hepatology
2016;63:1977-1986).
|Adolescent
[MESH]
|Amino Acid Sequence
[MESH]
|Animals
[MESH]
|Cattle
[MESH]
|Child
[MESH]
|Child, Preschool
[MESH]
|DNA Mutational Analysis
[MESH]
|Dogs
[MESH]
|Female
[MESH]
|Genes, Recessive
[MESH]
|Homozygote
[MESH]
|Humans
[MESH]
|Hypertension, Portal/*genetics
[MESH]
|Infant
[MESH]
|Liver Failure/genetics
[MESH]
|Male
[MESH]
|Molecular Sequence Data
[MESH]
|Pedigree
[MESH]
|Phosphotransferases (Alcohol Group Acceptor)/*genetics
[MESH]