chr5-173233142-CCG-AT

Position:

• chr5-173233142-CCG-AT

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_004387.4(NKX2-5):​c.400_402delCGGinsAT​(p.Arg134fs) variant causes a frameshift, missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: NKX2-5 NM_004387.4 frameshift, missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 1.90

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]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 107 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 5-173233142-CCG-AT is Pathogenic according to our data. Variant chr5-173233142-CCG-AT is described in ClinVar as [Likely_pathogenic]. Clinvar id is 44835.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NKX2-5	NM_004387.4	c.400_402delCGGinsAT	p.Arg134fs	frameshift_variant, missense_variant	2/2	ENST00000329198.5	NP_004378.1
NKX2-5	NM_001166176.2	c.*199_*201delCGGinsAT		3_prime_UTR_variant	2/2		NP_001159648.1
NKX2-5	NM_001166175.2	c.*353_*355delCGGinsAT		3_prime_UTR_variant	2/2		NP_001159647.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NKX2-5	ENST00000329198.5	c.400_402delCGGinsAT	p.Arg134fs	frameshift_variant, missense_variant	2/2	1	NM_004387.4	ENSP00000327758.4
NKX2-5	ENST00000424406	c.*353_*355delCGGinsAT		3_prime_UTR_variant	2/2	1		ENSP00000395378.2
NKX2-5	ENST00000521848	c.*199_*201delCGGinsAT		3_prime_UTR_variant	2/2	2		ENSP00000427906.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Heart, malformation of Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Mar 06, 2013

The Arg134fs variant in NKX2-5 has not been reported in the literature nor previ ously identified by our laboratory. This frameshift variant is predicted to alte r the protein?s amino acid sequence beginning at position 134 and lead to a prem ature termination codon 42 amino acids downstream. This alteration is predicted to lead to an abnormal protein. Truncating variants in the NKX2-5 gene are well- reported as disease-causing in individuals with septal defects and AV block (Sch ott 1998, Benson 1999). In summary, the predicted impact of this variant support s that it is likely pathogenic, though additional studies are required to fully establish its clinical significance. -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs397516908; hg19: chr5-172660145;