Details Of Published TSH Receptor Mutation
Gly 498 Ser
c.1492G>AInactivating TSH Receptor Mutation
Type
loss
Manifestation
family
Exon
10
Legend:
Male
Female
Unknown
Deceased
+
Mutation
-
Wild-Type
Heterozygous
Heterozygous
Compound Heterozygous
Homozygous
Hypothyroid
Hypoplastic Gland + Hypothyroid
P
Index Patient
Molecular Characteristics:
I/1: R450H
I/2: G498S
II/1: R450H (boy)
II/2 (propositus, boy) and II/3 (sister): R450H /G498S compound heterozygous
I/2: G498S
II/1: R450H (boy)
II/2 (propositus, boy) and II/3 (sister): R450H /G498S compound heterozygous
Clinical Features:
diagnosis: neonatal
euthyroid hyperthyrotropinaemia, slightly hypoplastic thyroid on ultrasound, normal 123-I scan, normal Tg levels
euthyroid hyperthyrotropinaemia, slightly hypoplastic thyroid on ultrasound, normal 123-I scan, normal Tg levels
Treatment:
default
Functional Characteristics:
cAMP
(basal)
(basal)
cAMP
(TSH)
(TSH)
IP
(basal)
(basal)
IP
(TSH)
(TSH)
TSH-Binding
Cell Surface Expression
Prevalence
LRA
Ref
0
0
nd
nd
(0)
0
1
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:
Nagashima et al.
Thyroid 11: 551-559
Novel inactivating missense mutations in the thyrotropin receptor gene in Japanese children with resistance to thyrotropin
2001