Novel mutations in CLN8 in Italian variant late infantile neuronal ceroid lipofuscinosis: Another genetic hit in the Mediterranean.
Neuronal ceroid lipofuscinoses (NCLs) are autosomal recessive neurodegenerative disorders typically characterized by the accumulation of autofluorescent material in tissues. On the basis of clinical features, age at onset, and molecular genetic defects, it is possible to distinguish at least nine forms. The CLN8 form was first described in Finland, where all the patients are homozygous for a p.Arg24Gly mutation in CLN8. More recently, it has been found that a subset of a Turkish variant of late infantile NCL (v-LINCL) is also associated with CLN8 mutations. To identify the molecular defect in Italian patients with v-LINCL, the CLN8 gene was directly sequenced in 10 patients. Controls were screened by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis. Five fluorescent-labeled microsatellite markers covering 1 cM around the gene were used for haplotype analysis. In three Italian v-LINCL patients, identified in a small area in southern Italy, we detected four new mutations in CLN8: c.66delG (p.Gly22fs), c.88G>C (p.Ala30Pro), c.473A>G (p.Tyr158Cys), and c.581A>G (p.Gln194Arg). The single-base deletion was found in two unrelated patients. The novel missense mutations were not identified in ethnically matched control chromosomes. Our findings expand the number of CLN8 variants and corroborate the notion that CLN8 patients are not confined to the Finnish population.
Molecular Medicine-IRCCS Children Hospital Bambino Gesù-Piazza S. Onofrio, 4-00165, Rome, Italy,
Natalia
N
Cannelli
Denise
D
Cassandrini
Enrico
E
Bertini
Pasquale
P
Striano
Lucia
L
Fusco
Roberto
R
Gaggero
Nicola
N
Specchio
Roberta
R
Biancheri
Federico
F
Vigevano
Claudio
C
Bruno
Alessandro
A
Simonati
Federico
F
Zara
Filippo M
FM
Santorelli
D000293:Adolescent; D000595:Amino Acid Sequence; D000818:Animals; D002648:Child; D002675:Child, Preschool; D004252:DNA Mutational Analysis; D005260:Female; D006239:Haplotypes; D006801:Humans; D007558:Italy; D008297:Male; D008565:Membrane Proteins / Q000235:genetics*; D008969:Molecular Sequence Data; D020125:Mutation, Missense; D009472:Neuronal Ceroid-Lipofuscinoses / Q000235:genetics* / Q000473:pathology; D010375:Pedigree; D016415:Sequence Alignment
C121767:CLN8 protein, human; D008565:Membrane Proteins