8-132868130-C-T

Position:

• chr8-132868130-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_003235.5(TG):​c.83C>T​(p.Ala28Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000159 in 1,614,130 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.00024 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00015 (0 hom.)
• Consequence: TG NM_003235.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.66

Genes affected

TG (HGNC:11764): (thyroglobulin) Thyroglobulin (Tg) is a glycoprotein homodimer produced predominantly by the thryroid gland. It acts as a substrate for the synthesis of thyroxine and triiodothyronine as well as the storage of the inactive forms of thyroid hormone and iodine. Thyroglobulin is secreted from the endoplasmic reticulum to its site of iodination, and subsequent thyroxine biosynthesis, in the follicular lumen. Mutations in this gene cause thyroid dyshormonogenesis, manifested as goiter, and are associated with moderate to severe congenital hypothyroidism. Polymorphisms in this gene are associated with susceptibility to autoimmune thyroid diseases (AITD) such as Graves disease and Hashimoto thryoiditis. [provided by RefSeq, Nov 2009]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.067898154).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TG	NM_003235.5	c.83C>T	p.Ala28Val	missense_variant	2/48	ENST00000220616.9	NP_003226.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TG	ENST00000220616.9	c.83C>T	p.Ala28Val	missense_variant	2/48	1	NM_003235.5	ENSP00000220616	P1
TG	ENST00000523901.1	c.83C>T	p.Ala28Val	missense_variant, NMD_transcript_variant	2/6	5		ENSP00000427871

Frequencies

GnomAD3 genomes AF: 0.000243 AC: 37 AN: 152144 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.000188

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000397

Gnomad OTH AF: 0.000956

GnomAD3 exomes AF: 0.000119 AC: 30 AN: 251394 Hom.: 0 AF XY: 0.000132 AC XY: 18 AN XY: 135868

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000578

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000196

Gnomad FIN exome AF: 0.0000462

Gnomad NFE exome AF: 0.000167

Gnomad OTH exome AF: 0.000326

GnomAD4 exome AF: 0.000150 AC: 219 AN: 1461868 Hom.: 0 Cov.: 32 AF XY: 0.000177 AC XY: 129 AN XY: 727234

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000134

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000151

Gnomad4 FIN exome AF: 0.0000187

Gnomad4 NFE exome AF: 0.000160

Gnomad4 OTH exome AF: 0.000199

GnomAD4 genome AF: 0.000243 AC: 37 AN: 152262 Hom.: 0 Cov.: 32 AF XY: 0.000201 AC XY: 15 AN XY: 74444

Gnomad4 AFR AF: 0.0000481

Gnomad4 AMR AF: 0.000131

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000208

Gnomad4 FIN AF: 0.000188

Gnomad4 NFE AF: 0.000397

Gnomad4 OTH AF: 0.000946

Alfa AF: 0.000274 Hom.: 0

Bravo AF: 0.000159

TwinsUK AF: 0.00 AC: 0

ALSPAC AF: 0.000259 AC: 1

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000233 AC: 2

ExAC AF: 0.000165 AC: 20

EpiCase AF: 0.000273

EpiControl AF: 0.000415

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Mar 13, 2024

Variant summary: TG c.83C>T (p.Ala28Val) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00012 in 251394 control chromosomes. This frequency does not allow conclusion about variant significance. To our knowledge, no occurrence of c.83C>T in individuals affected with TG-Related Disorders and no experimental evidence demonstrating its impact on protein function have been reported. No submitters have cited clinical-significance assessments for this variant to ClinVar. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	-0.27	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	19
DANN	Uncertain	1.0
DEOGEN2	Benign	0.11	T
Eigen	Benign	-0.46
Eigen_PC	Benign	-0.35
FATHMM_MKL	Benign	0.49	N
LIST_S2	Benign	0.78	T
M_CAP	Benign	0.033	D
MetaRNN	Benign	0.068	T
MetaSVM	Benign	-0.92	T
MutationAssessor	Uncertain	2.5	M
MutationTaster	Benign	0.99	N;N
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-1.6	N
REVEL	Benign	0.039
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.0050	D
Polyphen		0.024	B
Vest4		0.27
MVP		0.72
MPC		0.073
ClinPred		0.067	T
GERP RS		3.4
Varity_R		0.21
gMVP		0.62

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs114543085; hg19: chr8-133880375;