RGD Reference Report - Phenotypic and genotypic variability in Alpers syndrome. - Rat Genome Database

RGD Reference Report - Phenotypic and genotypic variability in Alpers syndrome. - Rat Genome Database

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Phenotypic and genotypic variability in Alpers syndrome.
Authors:	Sofou, K Moslemi, AR Kollberg, G Bjarnadottir, I Oldfors, A Nennesmo, I Holme, E Tulinius, M Darin, N
Citation:	Sofou K, etal., Eur J Paediatr Neurol. 2012 Jul;16(4):379-89. doi: 10.1016/j.ejpn.2011.12.006. Epub 2012 Jan 10.
RGD ID:	8694284
Pubmed:	PMID:22237560 (View Abstract at PubMed)
DOI:	DOI:10.1016/j.ejpn.2011.12.006 (Journal Full-text)
BACKGROUND: Alpers syndrome is one of the most common phenotypes of mitochondrial disorders in early childhood and has been associated with pathogenic mutations in POLG1. AIMS: To investigate the phenotypic-genotypic correlations in Alpers syndrome and to identify potential differences among patients with Alpers syndrome with or without pathogenic POLG1 mutations. METHODS: Patients with the phenotype of Alpers syndrome who were referred to our pediatric hospital during 1984-2007 and were diagnosed with mitochondrial encephalomyopathy underwent further biochemical, morphological and genetic investigations. RESULTS: A total of 19 patients were included in the study, of whom six had pathogenic POLG1 mutations including a novel mutation (c.907 G>A, p.Gly303Arg). Complete mtDNA sequencing in the subgroup without POLG1 mutations showed 5 novel and 5 very rare mtDNA variants considered as rare polymorphisms. Compared to POLG1(-) patients, the POLG1(+) patients more frequently had seizures at onset, which often became refractory. Ataxia and stroke-like episodes were much more common, while microcephaly and spasticity were encountered almost solely in the POLG1(-) group. Hepatic and ophthalmological involvement developed in 79% and 88% of patients, respectively. Most of the patients in both groups had predominant deficiency of complex I. In addition to the major degenerative changes in the cerebral cortex, the basal ganglia, thalamus and white matter were also involved to variable extent. CONCLUSION: Alpers syndrome is a heterogeneous syndrome that should be considered in patients with early-onset progressive cortical encephalopathy regardless of liver involvement. The phenotype is different depending on the presence or absence of POLG1 mutations.

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Object Symbol	Species	Term	Qualifier	Evidence	With	Notes	Source	Original Reference(s)
POLG	Human	Alpers-Huttenlocher syndrome		IAGP		DNA:missense mutations:cds:	RGD
Polg	Rat	Alpers-Huttenlocher syndrome		ISO	POLG (Homo sapiens)	DNA:missense mutations:cds:	RGD
Polg	Mouse	Alpers-Huttenlocher syndrome		ISO	POLG (Homo sapiens)	DNA:missense mutations:cds:	RGD

Genes (Rattus norvegicus)


Polg (DNA polymerase gamma, catalytic subunit)

Genes (Mus musculus)


Polg (polymerase (DNA directed), gamma)

Genes (Homo sapiens)


POLG (DNA polymerase gamma, catalytic subunit)