Genetic investigation of the TSPYL1 gene in sudden infant death syndrome.
BACKGROUND
Sudden infant death syndrome (SIDS) constitutes the most frequent cause of death in the postperinatal period in Germany. Recently, a lethal phenotype characterized by sudden infant death with dysgenesis of the testes syndrome (SIDDT) was identified to be caused by loss of function mutations in the TSPYL1 gene.


OBJECTIVE
The study's purpose was to reveal a possible role of TSPYL1 in SIDS.


METHODS
DNA samples of 126 SIDS cases and 261 controls were investigated.


RESULTS
We found five sequence variations, each of them causing an amino acid substitution. No Hardy Weinberg disequilibrium and no significant difference in allele frequencies between patients and controls were observed for any variation. In one female patient a p.F366L amino acid polymorphism was found heterozygous, which could not be displayed in controls. A pathogenic implication of this substitution, which is conserved in primates and rodents, cannot be ruled out completely. Because SIDDT is the result of homozygous TSPYL1 mutations, this heterozygous exchange cannot solely explain the sudden death in this child. The reported mutation associated with SIDDT (457_458insG) was not detectable in our cohort.


CONCLUSIONS
No association of sequence variations in the TSPYL1 gene and SIDS has been found in a German cohort. Genetic analysis of TSPYL1 seems to be of limited significance in the differential diagnosis of SIDS without dysgenesis of the testes.
Hering
Robert
R
Institute for Human Genetics, Department of Medical Genetics, University of Tuebingen, Calwerstrasse 7, 72072 Tuebingen, Germany.
Frade-Martinez
Rosario
R
Bajanowski
Thomas
T
Poets
Christian F
CF
Tschentscher
Frank
F
Riess
Olaf
O
D000368:Aged; D000369:Aged, 80 and over; D019943:Amino Acid Substitution; D016022:Case-Control Studies; D015331:Cohort Studies; D003937:Diagnosis, Differential; D005260:Female; D006059:Gonadal Dysgenesis / Q000175:diagnosis / Q000235:genetics / Q000473:pathology; D006720:Homozygote; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D015810:Linkage Disequilibrium; D008297:Male; D009154:Mutation; D009687:Nuclear Proteins; D011506:Proteins / Q000235:genetics*; D013398:Sudden Infant Death / Q000235:genetics* / Q000473:pathology; D013737:Testis / Q000473:pathology
D009687:Nuclear Proteins; D011506:Proteins; C510183:TSPYL1 protein, human