FH
In
databases:
● Ensembl (http://www.ensembl.org/index.html):
ENSG00000091483
● HGNC (http://www.genenames.org/): 3700 or FH
● EC enzyme
number : EC 4.2.1.2
Gene locus:
1q42.1
Protein name:
Fumarate hydratase (fumarase)
Protein Size:
510 amino acids; about 55 kDa
Function:
Fumarase is a homotetramer that plays a
key enzymatic role in fundamental metabolic pathways. The mitochondrial
isoenzyme catalyzes conversion of fumarate to malate in the Krebs, or
tricarboxylic acid (TCA) cycle, in which acetyl-CoA produces CO2, reduced
electron carriers (FADH2 and NADH) and ATP. The cytosolic isoenzyme is involved
with amino acid metabolism.
Cancer-related alterations:
Germline mutations in FH are associated
with two distinct conditions:
Homozygous and compound heterozygous
mutations (e.g., missense and in-frame deletions) of the 3' end result in
fumarate hydratase deficiency (FHD). FHD is characterized by progressive
encephalopathy, developmental delay, hypotonia, cerebral atrophy and lactic and
pyruvic acidemia. The most common allelic abnormality is a 3 base pair- AAA
insertion.
Heterozygous 5' mutations (e.g., nonsense,
missense and deletions ranging from one base pair to whole gene) predispose
individuals to somatic mutations in the normal allele leading to Hereditary
leiomyomatosis and renal cell carcinoma / multiple cutaneous and uterine
leiomyomatosis (HLRCC/MCUL1).
Somatic mutations: Loss-of-heterozygosity of the wild type allele results in
functional nullizygosity for fumarate hydratase. Malignant uterine and kidney
tumors characteristic of HLRCC can subsequently develop. Uterine leiomyomatosis
has also been observed in patients with deletion of FH from structural
rearrangements of 1q42.1. The probable mechanism is presumably haploinsufficiency
Références (open access):
Genetic and epigenetic alterations during
renal carcinogenesis. Arai E, Kanai Y. Int J Clin Exp Pathol. 2010 Dec
13;4(1):58-73.
HIF and fumarate hydratase in renal
cancer. Sudarshan S, Linehan WM, Neckers L. Br J Cancer. 2007 Feb
12;96(3):403-7.
Genetic heterogeneity among uterine
leiomyomata: insights into malignant progression. Hodge JC, Morton CC. Hum Mol
Genet. 2007 Apr 15;16 Spec No 1:R7-13.
Structural basis of fumarate hydratase
deficiency. Picaud S, Kavanagh KL, Yue WW, Lee WH, Muller-Knapp S, Gileadi O,
Sacchettini J, Oppermann U. J Inherit Metab Dis. 2011 Jun;34(3):671-6.
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