A novel presenilin 1 mutation (L174 M) in a large Cuban family with early onset Alzheimer disease.

A change was not observed in 80 control chromosomes from the Cuban population. Leucine at position 174 is highly conserved among species and is identical in presenilin 1 and presenilin 2 proteins. We propose the L174 M mutation might lead to an abnormal N-terminal and probably C-terminal fragments and malfunction of the protein complex. In conclusion, we found a novel PSEN1 mutation in a large family with clinical and pathological diagnosis of early onset familial Alzheimer disease, which may be relevant for other Hispanic populations. -->
Substance Nomenclature: 0 (Apolipoproteins E)
0 (Genetic Markers)
0 (Membrane Proteins)
0 (PSEN1 protein, human)
0 (Presenilin-1)
Entry Date(s): Date Created: 20021218 Date Completed: 20030123 Latest Revision: 20211203
Update Code: 20221213
DOI: 10.1007/s10048-002-0136-6
PMID: 12484344
Autor: Bertoli Avella AM; Department of Clinical Genetics, Erasmus Medical Center, Rotterdam, The Netherlands., Marcheco Teruel B, Llibre Rodriguez JJ, Gomez Viera N, Borrajero Martinez I, Severijnen EA, Joosse M, van Duijn CM, Heredero Baute L, Heutink P
Jazyk: angličtina
Zdroj: Neurogenetics [Neurogenetics] 2002 Oct; Vol. 4 (2), pp. 97-104.
DOI: 10.1007/s10048-002-0136-6
Abstrakt: We studied a Cuban family with presenile dementia (autosomal dominant) consisting of 281 members within six generations, the proband descended from a Spanish founder. Mean age at onset was 59 years of age. Memory impairment was the main symptom in all patients, additionally, ischemic episodes were described in 4 (n = 18) patients. Neuropathological examination of brain material (1 patient) revealed neuronal loss, amyloid plaques, and neurofibrillary tangles. Thirty DNA samples were genotyped (regions on chromosome 1, 3, 10, 12, 14, 17, 19, 20, and 21). A maximum Lod score of 3.79 at theta = 0 was obtained for marker D14S43, located in a 9-cM interval in which all patients shared the same haplotype. Sequencing of the PSEN1 gene revealed a heterozygous base substitution, C520A (exon 6), which is predicted to cause an amino acid change from leucine to methionine in the TMIII of the presenilin 1 protein. The mutation was found to co-segregate with the disease phenotype and the associated disease haplotype. The C --> A change was not observed in 80 control chromosomes from the Cuban population. Leucine at position 174 is highly conserved among species and is identical in presenilin 1 and presenilin 2 proteins. We propose the L174 M mutation might lead to an abnormal N-terminal and probably C-terminal fragments and malfunction of the protein complex. In conclusion, we found a novel PSEN1 mutation in a large family with clinical and pathological diagnosis of early onset familial Alzheimer disease, which may be relevant for other Hispanic populations.
Databáze: MEDLINE
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