Molecular analysis of the neuropeptide Y1 receptor gene in human idiopathic gonadotropin-dependent precocious puberty and isolated hypogonadotropic hypogonadism.
OBJECTIVE
To investigate the role of mutations or polymorphisms in the NPY-Y1R gene in human idiopathic central pubertal disorders.


METHODS
Molecular studies.


METHODS
University hospital.


METHODS
Thirty-three patients with gonadotropin-dependent precocious puberty, 22 with hypogonadotropic hypogonadism, and 50 controls.


METHODS
Genomic DNA extraction, NPY-Y1R gene sequence analysis, cell-surface expression, and functional activity of an identified receptor variant.


METHODS
Results of sequencing, cell-surface receptor expression, and receptor function.


RESULTS
A heterozygous substitution of lysine (K) by threonine (T) at position 374 in the carboxyl terminal region of NPY-Y1R was identified in a girl with familial GDPP. Her mother, who had pubertal developmental at appropriate age, carried the same genetic variant. Introduction of the K374T variant into an expression vector containing the human NPY-Y1R complementary DNA led to a partial reduction in cell-surface expression of NPY-Y1R in transiently transfected HEK293 cells. This mutation did not lead to a significant reduction in NPY-stimulated activity of the receptor in this heterologous expression system. No other allelic variants of the NPY-Y1R gene were identified in patients or controls.


CONCLUSIONS
We have identified an inherited heterozygous variant of the NPY-Y1R gene in a girl with precocious puberty; however, this most likely did not contribute to her phenotype. Mutations of the highly conserved NPY-Y1R gene do not appear to represent a frequent mechanism underlying human idiopathic central pubertal disorders.
Freitas
Karina Cocco Monteiro
KC
Developmental Endocrinology Unit, Hormone and Molecular Genetics Laboratory, Clinical Hospital, São Paulo University Medical School, São Paulo, Brazil. karinamf@brturbo.com.br <karinamf@brturbo.com.br>
Ryan
Ginny
G
Brito
Vinicius Nahime
VN
Tao
Ya-Xiong
YX
Costa
Elaine Maria Frade
EM
Mendonca
Berenice Bilharinho
BB
Segaloff
Deborah
D
Latronico
Ana Claudia
AC
D000293:Adolescent; D000328:Adult; D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D002478:Cells, Cultured; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007006:Hypogonadism / Q000235:genetics*; D007223:Infant; D008297:Male; D017354:Point Mutation; D011629:Puberty, Precocious / Q000235:genetics*; D017476:Receptors, Neuropeptide Y / Q000235:genetics*
D017476:Receptors, Neuropeptide Y; C097212:neuropeptide Y-Y1 receptor