chr5-173232589-G-A

Variant names:

• chr5-173232589-G-A
• NM_004387.4:c.955C>T

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_004387.4(NKX2-5):​c.955C>T​(p.His319Tyr) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H319R) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NKX2-5 NM_004387.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.46
• Publications: 0 publications found

Genes affected

NKX2-5 (HGNC:2488): (NK2 homeobox 5) This gene encodes a homeobox-containing transcription factor. This transcription factor functions in heart formation and development. Mutations in this gene cause atrial septal defect with atrioventricular conduction defect, and also tetralogy of Fallot, which are both heart malformation diseases. Mutations in this gene can also cause congenital hypothyroidism non-goitrous type 5, a non-autoimmune condition. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Oct 2009]

NKX2-5 Gene-Disease associations (from GenCC):

• atrial septal defect 7

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, Orphanet
• hypothyroidism, congenital, nongoitrous, 5

  Inheritance: AD, Unknown Classification: DEFINITIVE, MODERATE, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• NKX2.5-related congenital, conduction and myopathic heart disease

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• tetralogy of fallot

  Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
• conotruncal heart malformations

  Inheritance: SD, AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• athyreosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial atrial fibrillation

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial bicuspid aortic valve

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial isolated congenital asplenia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• dilated cardiomyopathy

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.814

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NKX2-5	NM_004387.4	c.955C>T	p.His319Tyr	missense_variant	Exon 2 of 2	ENST00000329198.5	NP_004378.1
NKX2-5	NM_001166176.2	c.*754C>T		3_prime_UTR_variant	Exon 2 of 2		NP_001159648.1
NKX2-5	NM_001166175.2	c.*908C>T		3_prime_UTR_variant	Exon 2 of 2		NP_001159647.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NKX2-5	ENST00000329198.5	c.955C>T	p.His319Tyr	missense_variant	Exon 2 of 2	1	NM_004387.4	ENSP00000327758.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Jan 31, 2025

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis indicates that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.45
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.11
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.62	D
Eigen	Uncertain	0.57
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.91	D
M_CAP	Pathogenic	0.35	D
MetaRNN	Pathogenic	0.81	D
MetaSVM	Uncertain	0.48	D
MutationAssessor	Benign	1.8	L
PhyloP100		6.5
PrimateAI	Pathogenic	0.85	D
PROVEAN	Benign	-2.2	N
REVEL	Pathogenic	0.67
Sift	Uncertain	0.012	D
Sift4G	Uncertain	0.014	D
Polyphen		0.99	D
Vest4		0.78
MutPred		0.46		Loss of disorder (P = 0.0264);
MVP		0.85
MPC		0.93
ClinPred		0.98	D
GERP RS		4.3
Varity_R		0.24
gMVP		0.82
Mutation Taster		=51/49	polymorphism

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

Other links and lift over

hg19: chr5-172659592; COSMIC: COSV61299645; COSMIC: COSV61299645;