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* To whom correspondence should be addressed. E-mail: jpmb{at}servidor.unam.mx.
Kallmann syndrome (KS) is characterized by the association of hypogonadotropic hypogonadism and anosmia or hyposmia. To date, four different genes have been identified as responsible for the presence of KS; however in many cases no mutations have been found in any of these genes. Herein, we report the molecular findings regarding the analysis of the FGFR1, PROKR2, and PROK2 in patients with Kallmann syndrome (KS). Twenty four patients with KS were studied in whom mutations in KAL1 had been investigated previously. PCR products from the FGFR1, PROKR2, and PROK2, were sequenced and mutations were sought in the open reading frame of the three genes. Two patients presented a heterozygous T-to-G transversion in exon 2 (c.518T>G) of the PROKR2, which results in a leucine-to-arginine substitution at codon 173. Our results strengthen the hypothesis of possible digenic inheritance in some patients with KS. Likewise, our data extend previous reports demonstrating that PROKR2 plays a role in the etiology of this syndrome.
Key words: Androgen
Hormone
Penis
Puberty
Testis
KAL1
Kallmann syndrome
PROKR2
digenic inheritance
mutations
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