Details Of Published TSH Receptor Mutation
Ala 623 Val
c.1868C>TConstitutively Activating TSH Receptor Mutation
Type
gain
Manifestation
somatic
Exon
10
Molecular Characteristics:
default
Clinical Features:
based on 21 hot nodules investigated by Paschke et al. 1994, Russo et al., 1996 Tonacchera et al. 1998, Fuhrer et al. 1997, Derwahl et al. 1996, Nogueira et al., 1999, Gozu et al. 2005 and 2006, Trulzsch et al. 2001, Palos-Paz et al. 2008, Krohn et al. 2008
Treatment:
default
Functional Characteristics:
cAMP
(basal)
(basal)
cAMP
(TSH)
(TSH)
IP
(basal)
(basal)
IP
(TSH)
(TSH)
TSH-Binding
Cell Surface Expression
Prevalence
LRA
Ref
4.5-5.0
0.8-1.2
0.9-1.0
1.0
-
1.0
21
5.0±0.7
1,13
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:
Paschke et al.
J. Clin. Endocrinol. Metab. 79: 1785-1789
Identification and functional characterization of two new somatic mutations causing constitutive activation of the thyrotropin receptor in hyperfunctioning autonomous adenomas of the thyroid
1994
Reference 2:
Russo et al.
J. Clin. Endocrinol. Metab. 80: 1347-1351
Genetic alterations in thyroid hyperfunctioning adenomas
1995
Reference 3:
Fuhrer et al.
J. Clin. Endocrinol. Metab. 82: 3885-3891
Somatic mutations in the thyrotropin receptor gene and not in the Gs alpha protein gene in 31 toxic thyroid nodules
1997
Reference 4:
Tonacchera et al.
J. Clin. Endocrinol. Metab. 83: 492-498
Hyperfunctioning thyroid nodules in toxic multinodular goiter share activating thyrotropin receptor mutations with solitary toxic adenoma
1998
Reference 5:
Nogueira et al.
Thyroid 9: 1063-1068
Thyrotropin receptor mutations in hyperfunctioning thyroid adenomas from Brazil
1999
Reference 6:
Trülzsch et al.
J. Mol. Med. 78: 684-691
Detection of thyroid-stimulating hormone receptor and Gsalpha mutations: in 75 toxic thyroid nodules by denaturing gradient gel electrophoresis.
2001
Reference 7:
Van Sande et al.
J. Clin. Endocrinol. Metab. 80: 2577-2585
Somatic and germline mutations of the TSH receptor gene in thyroid diseases
1995
Reference 8:
Tonacchera et al.
J Clin Endocrinol Metab. 85: 2270-4
Activating thyrotropin receptor mutations are present in nonadenomatous hyperfunctioning nodules of toxic or autonomous multinodular goiter.
2000
Reference 9:
Gozu et al.
Eur J Endocrinol. 155: 535-45
Similar prevalence of somatic TSH receptor and Gsalpha mutations in toxic thyroid nodules in geographical regions with different iodine supply in Turkey.
2006
Reference 10:
Derwahl et al.
J Clin Endocrinol Metab.81: 1898-904
Constitutive activation of the Gs alpha protein-adenylate cyclase pathway may not be sufficient to generate toxic thyroid adenomas.
1996
Reference 11:
Gozu et al.
Endocr J. 52: 577-85
Mutations in the thyrotropin receptor signal transduction pathway in the hyperfunctioning thyroid nodules from multinodular goiters: a study in the Turkish population.
2005
Reference 12:
Sancak et al.
Horm Metab Res. 43:562-8
High Prevalence of TSHR/Gsalpha Mutation-negative Clonal Hot Thyroid Nodules (HNs) in a Turkish Cohort
2011
Reference 13:
Jäschke et al.
Cell Mol Life Sci 65:4028-4038
Preferences of transmembrane helices for cooperative amplification of G(alpha)s and G (alpha)q signaling of the thyrotropin receptor.
2008