RGD Reference Report - Hereditary hyperferritinemia-cataract syndrome caused by a 29-base pair deletion in the iron responsive element of ferritin L-subunit gene. - Rat Genome Database

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Hereditary hyperferritinemia-cataract syndrome caused by a 29-base pair deletion in the iron responsive element of ferritin L-subunit gene.

Authors: Girelli, D  Corrocher, R  Bisceglia, L  Olivieri, O  Zelante, L  Panozzo, G  Gasparini, P 
Citation: Girelli D, etal., Blood. 1997 Sep 1;90(5):2084-8.
RGD ID: 1598966
Pubmed: (View Article at PubMed) PMID:9292547

Iron availability regulates ferritin synthesis posttranscriptionally by the interaction between iron-regulatory proteins (IRPs) and an iron responsive element (IRE), a stem-loop sequence located on the 5' untranslated region of ferritin mRNA. IRPs recognize IREs as a sequence/structure motif, blocking ferritin translation. Recently, we and others independently described families with a combination of hyperferritinemia (serum L-ferritin > or = 1,000 microg/L, without iron overload) and congenital bilateral cataract, transmitted as an autosomal-dominant trait. The molecular basis were two distinct point mutations in the highly conserved CAGUG(X) hexaloop of L-ferritin IRE on chromosome 19. A new three-generation family with a similar phenotype and a unique genotype is here reported. DNA amplification by polymerase chain reaction and sequence analysis showed a 29-base pair deletion in the L-ferritin IRE, involving the whole 5' sequence essential to the base pairing of the IRE stem. This deletion is predicted to cause the disruption of IRE stem-loop secondary structure and the nearly complete abolition of the negative control of ferritin synthesis by IRE/IRP binding. Hereditary Hyperferritinemia-Cataract Syndrome (HHCS) appears as a new genetic disorder with a unique phenotype associated with at least four different mutations in the L-ferritin IRE. Hematologists should take into account HHCS in the differential diagnosis of unexplained hyperferritinemia.

Annotation

Disease Annotations    

Objects Annotated

Genes (Rattus norvegicus)
Ftl1  (ferritin light chain 1)

Genes (Mus musculus)
Ftl1  (ferritin light polypeptide 1)

Genes (Homo sapiens)
FTL  (ferritin light chain)


Additional Information