Details Of Published TSH Receptor Mutation

Asn 670 Ser

c.2009A>G

Constitutively Activating TSH Receptor Mutation

Type
gain
Manifestation
sporadic
Exon
10
Molecular Characteristics:
NOTE:
constitutive activity only in HEK-cells, not in COS-7 cells 
Clinical Features:
Late Manifestation of Subclinical Hyperthyroidism
After Goitrogenesis in an Index Patient with a N670S
TSH Receptor Germline Mutation Masquerading as
TSH Receptor Antibody Negative Graves’ Disease 
Treatment:
Radioiodine
Functional Characteristics:
cAMP
(basal)
cAMP
(TSH)
IP
(basal)
IP
(TSH)
TSH-Binding
Cell Surface Expression
Prevalence
LRA
Ref
1.7-2.4
0.6
n.d.
n.d.
n.d.
1
1
0.5±0.1;2.5
Legend:
cAMP (basal): basal in vitro cAMP production of mutant over wild-type TSHR
cAMP (TSH): maximal in vitro cAMP production of mutant over wild-type TSHR
IP (basal): basal in vitro IP production of mutant over wild-type TSHR
IP (TSH): maximal in vitro IP production of mutant over wild-type TSHR
TSH-binding: maximal TSH-binding compared to the wild-type TSHR
Cell surface expression: cell surface expression of mutant compared to WT-TSHR
LRA: linear regression analysis (LRA) of constitutive activity as a function of TSHR expression determined by 125I-bTSH binding or FACS analysis compared to the wild-type TSHR
Prevalence: Prevalence of (somatic and germline) activating mutations*
Ref: Reference for functional characterization
Child: Found in children.
Reference 1:
Tonacchera et al.
J. Clin. Endocrinol. Metab. 81: 547-554
Functional characteristics of three new germline mutations of the thyrotropin receptor gene causing autosomal dominant toxic thyroid hyperplasia
1996
Reference 2:
Mueller et al.
Thyroid. 19(7):765-73
Cases of borderline in vitro constitutive thyrotropin receptor activity: how to decide whether a thyrotropin receptor mutation is constitutively active or not?
2009
Reference 3:
Neumann et al.
Mol Endocrinol. 15:1294-305.
A free carboxylate oxygen in the side chain of position 674 in transmembrane domain 7 is necessary for TSH receptor activation.
2001
Reference 4:
Schaarschmidt et al
Horm Metab Res
Late Manifestation of Subclinical Hyperthyroidism After Goitrogenesis in an Index Patient with a N670S TSH Receptor Germline Mutation Masquerading as TSH Receptor Antibody Negative Graves’ Disease
2012