14-36517067-TAA-TAAAAA

Variant names:

• chr14-36517067-T-TAAA
• rs886050480
• NM_001079668.3:c.*208_*210dupTTT

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001079668.3(NKX2-1):​c.*208_*210dupTTT variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 729,846 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 29)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: NKX2-1 NM_001079668.3 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.620
• Publications: 0 publications found

Genes affected

NKX2-1 (HGNC:11825): (NK2 homeobox 1) This gene encodes a protein initially identified as a thyroid-specific transcription factor. The encoded protein binds to the thyroglobulin promoter and regulates the expression of thyroid-specific genes but has also been shown to regulate the expression of genes involved in morphogenesis. Mutations and deletions in this gene are associated with benign hereditary chorea, choreoathetosis, congenital hypothyroidism, and neonatal respiratory distress, and may be associated with thyroid cancer. Multiple transcript variants encoding different isoforms have been found for this gene. This gene shares the symbol/alias 'TTF1' with another gene, transcription termination factor 1, which plays a role in ribosomal gene transcription. [provided by RefSeq, Feb 2014]

SFTA3 (HGNC:):

SFTA3 (HGNC:18387): (surfactant associated 3) Involved in wound healing. Located in cytoplasm and extracellular space. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NKX2-1	NM_001079668.3	c.*208_*210dupTTT		3_prime_UTR_variant	Exon 3 of 3	ENST00000354822.7	NP_001073136.1
NKX2-1	NM_003317.4	c.*208_*210dupTTT		3_prime_UTR_variant	Exon 2 of 2		NP_003308.1
SFTA3	NR_161364.1	n.89+2398_89+2400dupTTT		intron_variant	Intron 1 of 4
SFTA3	NR_161365.1	n.89+2398_89+2400dupTTT		intron_variant	Intron 1 of 4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NKX2-1	ENST00000354822.7	c.*208_*210dupTTT		3_prime_UTR_variant	Exon 3 of 3	1	NM_001079668.3	ENSP00000346879.6
SFTA3	ENST00000546983.2	n.373+1915_373+1917dupTTT		intron_variant	Intron 2 of 3	4		ENSP00000449302.2

Frequencies

GnomAD3 genomes Cov.: 29

GnomAD4 exome AF: 0.00000137 AC: 1 AN: 729846 Hom.: 0 Cov.: 10 AF XY: 0.00 AC XY: 0 AN XY: 362756

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 16560

American (AMR) AF: 0.00 AC: 0 AN: 13470

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 13298

East Asian (EAS) AF: 0.00 AC: 0 AN: 26972

South Asian (SAS) AF: 0.00 AC: 0 AN: 43880

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 25022

Middle Eastern (MID) AF: 0.000427 AC: 1 AN: 2342

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 555048

Other (OTH) AF: 0.00 AC: 0 AN: 33254

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 29

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.62

Splicing

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

Other links and lift over

dbSNP: rs886050480; hg19: chr14-36986272;