FGFR1 and PROKR2 rare variants found in patients with combined pituitary hormone deficiencies.

Abstract:

:The genetic aetiology of congenital hypopituitarism (CH) is not entirely elucidated. FGFR1 and PROKR2 loss-of-function mutations are classically involved in hypogonadotrophic hypogonadism (HH), however, due to the clinical and genetic overlap of HH and CH; these genes may also be involved in the pathogenesis of CH. Using a candidate gene approach, we screened 156 Brazilian patients with combined pituitary hormone deficiencies (CPHD) for loss-of-function mutations in FGFR1 and PROKR2. We identified three FGFR1 variants (p.Arg448Trp, p.Ser107Leu and p.Pro772Ser) in four unrelated patients (two males) and two PROKR2 variants (p.Arg85Cys and p.Arg248Glu) in two unrelated female patients. Five of the six patients harbouring the variants had a first-degree relative that was an unaffected carrier of it. Results of functional studies indicated that the new FGFR1 variant p.Arg448Trp is a loss-of-function variant, while p.Ser107Leu and p.Pro772Ser present signalling activity similar to the wild-type form. Regarding PROKR2 variants, results from previous functional studies indicated that p.Arg85Cys moderately compromises receptor signalling through both MAPK and Ca(2) (+) pathways while p.Arg248Glu decreases calcium mobilization but has normal MAPK activity. The presence of loss-of-function variants of FGFR1 and PROKR2 in our patients with CPHD is indicative of an adjuvant and/or modifier effect of these rare variants on the phenotype. The presence of the same variants in unaffected relatives implies that they cannot solely cause the phenotype. Other associated genetic and/or environmental modifiers may play a role in the aetiology of this condition.

journal_name

Endocr Connect

journal_title

Endocrine connections

authors

Correa FA,Trarbach EB,Tusset C,Latronico AC,Montenegro LR,Carvalho LR,Franca MM,Otto AP,Costalonga EF,Brito VN,Abreu AP,Nishi MY,Jorge AA,Arnhold IJ,Sidis Y,Pitteloud N,Mendonca BB

doi

10.1530/EC-15-0015

subject

Has Abstract

pub_date

2015-06-01 00:00:00

pages

100-7

issue

2

issn

2049-3614

pii

EC-15-0015

journal_volume

4

pub_type

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