8-132867003-G-T

Variant names:

• chr8-132867003-G-T
• NM_003235.5:c.3G>T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PVS1_Moderate PM2

The NM_003235.5(TG):​c.3G>T​(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000694 in 1,441,872 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: TG NM_003235.5 start_lost
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.08

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 Uncertain_significance. Variant got 4 ACMG points.

• PVS1: Start lost variant, next in-frame start position is after 2 pathogenic variants. Next in-frame start position is after 146 codons. Genomic position: 132871509. Lost 0.052 part of the original CDS.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TG	NM_003235.5	c.3G>T	p.Met1?	start_lost	Exon 1 of 48	ENST00000220616.9	NP_003226.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TG	ENST00000220616.9	c.3G>T	p.Met1?	start_lost	Exon 1 of 48	1	NM_003235.5	ENSP00000220616.4
TG	ENST00000523901.1	n.3G>T		non_coding_transcript_exon_variant	Exon 1 of 6	5		ENSP00000427871.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.94e-7 AC: 1 AN: 1441872 Hom.: 0 Cov.: 31 AF XY: 0.00000140 AC XY: 1 AN XY: 715138

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000120

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Iodotyrosyl coupling defect Uncertain:1

Jan 03, 2022

3billion, Medical Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Start-lost: reinitiation of translation may occur at a downstream alternate start codon but still result in a loss or disruption of normal protein function as there have been pathogenic variants reported upstream of the alterante start codon (PVS1_M). It is not observed in the gnomAD v2.1.1 dataset (PM2_M). Therefore, this variant is classified as uncertain significance according to the recommendation of ACMG/AMP guideline. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.062	T
Eigen	Benign	-0.035
Eigen_PC	Benign	0.075
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.38	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Benign	-0.75	T
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.26
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.016	D
Polyphen		0.13	B
Vest4		0.79
MutPred		0.90		Gain of catalytic residue at M1 (P = 0.0116);
MVP		0.65
ClinPred		0.99	D
GERP RS		3.3
Varity_R		0.86
gMVP		0.63

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr8-133879248;