Vacuolating megalencephalic leukoencephalopathy with subcortical cysts: functional studies of novel variants in MLC1.
Nine new unrelated patients presenting vacuolating myelinopathy with subcortical cysts were identified and analyzed for variations in the MLC1 gene. We detected 12 mutations (p.Leu37fs, p.Met80Val, p.Leu83Phe, p.Pro92Ser, p.Ser93Leu, p.Ile108fs, p.Gly130Arg, p.Cys171fs, p.Glu202Lys, p.Ser269Tyr, p.Ala275Asn, and p.Leu310_311insLeu) of which nine were novel. In one patient we did not detect mutations. Using a heterologous system, three new missense variants (p.Glu202Lys, p.Ser269Tyr, and p.Ala275Asn) and a single leucine insertion (p.Leu310insLeu)--lying in a stretch of seven leucines--were functionally assayed by determining total protein levels and mutant protein expression at the plasma membrane. No correlation was observed between mutation, clinical features, and plasma membrane expression of mutant protein.
Montagna
Giorgia
G
Molecular Medicine, IRCCS-Bambino Gesù Children's Hospital, Rome, Italy.
Teijido
Oscar
O
Eymard-Pierre
Eleonore
E
Muraki
Koutarou
K
Cohen
Bruce
B
Loizzo
Annalivia
A
Grosso
Pietro
P
Tedeschi
Gioacchino
G
Palacín
Manuel
M
Boespflug-Tanguy
Odile
O
Bertini
Enrico
E
Santorelli
Filippo M
FM
Estévez
Raúl
R
D000293:Adolescent; D000328:Adult; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002462:Cell Membrane / Q000378:metabolism; D002648:Child; D002675:Child, Preschool; D005260:Female; D005786:Gene Expression Regulation; D014644:Genetic Variation; D020279:Hereditary Central Nervous System Demyelinating Diseases / Q000235:genetics*; D006801:Humans; D007223:Infant; D008297:Male; D008565:Membrane Proteins / Q000235:genetics*; D008969:Molecular Sequence Data; D009865:Oocytes / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D014981:Xenopus
C425069:MLC1 protein, human; D008565:Membrane Proteins