8-23702671-G-A

Position:

• chr8-23702671-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001136271.3(NKX2-6):​c.686C>T​(p.Ala229Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000286 in 1,398,486 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000029 (0 hom.)
• Consequence: NKX2-6 NM_001136271.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.190

Genes affected

NKX2-6 (HGNC:32940): (NK2 homeobox 6) This gene encodes a homeobox-containing protein that belongs to the NK-2 homeobox family. This protein is a vertebrate homolog of Drosophila homeobox-containing protein called 'tinman', which has been shown to be essential for development of the heart-like dorsal vessel. In conjunction with related gene, NKX2-5, this gene may play a role in both pharyngeal and cardiac embryonic development. Mutations in this gene are associated with persistent truncus arteriosus.[provided by RefSeq, Aug 2011]

LOC107986930 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.24938154).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NKX2-6	NM_001136271.3	c.686C>T	p.Ala229Val	missense_variant	2/2	ENST00000325017.4
LOC107986930	XR_001745842.2	n.1312+33921G>A		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NKX2-6	ENST00000325017.4	c.686C>T	p.Ala229Val	missense_variant	2/2	2	NM_001136271.3	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000286 AC: 4 AN: 1398486 Hom.: 0 Cov.: 33 AF XY: 0.00000435 AC XY: 3 AN XY: 689734

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000371

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000313 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Conotruncal heart malformations Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 07, 2018

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with NKX2-6-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces alanine with valine at codon 229 of the NKX2-6 protein (p.Ala229Val). The alanine residue is highly conserved and there is a small physicochemical difference between alanine and valine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.097
BayesDel_addAF	Benign	0.0070	T
BayesDel_noAF	Benign	-0.23
CADD	Benign	18
DANN	Uncertain	1.0
DEOGEN2	Benign	0.14	T
Eigen	Benign	-0.51
Eigen_PC	Benign	-0.70
FATHMM_MKL	Benign	0.51	D
LIST_S2	Benign	0.47	T
M_CAP	Pathogenic	0.42	D
MetaRNN	Benign	0.25	T
MetaSVM	Uncertain	-0.20	T
MutationAssessor	Uncertain	2.2	M
MutationTaster	Benign	1.0	N;N
PrimateAI	Uncertain	0.63	T
PROVEAN	Benign	-1.7	N
REVEL	Benign	0.28
Sift	Benign	0.042	D
Sift4G	Uncertain	0.030	D
Polyphen		0.79	P
Vest4		0.18
MutPred		0.26		Loss of glycosylation at P228 (P = 0.0602);
MVP		0.52
MPC		0.63
ClinPred		0.26	T
GERP RS		1.9
Varity_R		0.069
gMVP		0.40

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: rs1563303655; hg19: chr8-23560184;