rs876657934

Positions:

• chr5-173233212-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP5_Moderate

The ENST00000329198.5(NKX2-5):​c.335-3C>G variant causes a splice region, splice polypyrimidine tract, intron change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: NKX2-5 ENST00000329198.5 splice_region, splice_polypyrimidine_tract, intron
• Scores: Splicing: ADA: 0.9999
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 6.29

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 Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 5-173233212-G-C is Pathogenic according to our data. Variant chr5-173233212-G-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 229066.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.335-3C>G		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		ENST00000329198.5	NP_004378.1
NKX2-5	NM_001166175.2	c.*285C>G		3_prime_UTR_variant	2/2		NP_001159647.1
NKX2-5	NM_001166176.2	c.*131C>G		3_prime_UTR_variant	2/2		NP_001159648.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NKX2-5	ENST00000424406.2	c.*285C>G		3_prime_UTR_variant	2/2	1		ENSP00000395378
NKX2-5	ENST00000329198.5	c.335-3C>G		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		1	NM_004387.4	ENSP00000327758	P1
NKX2-5	ENST00000521848.1	c.*131C>G		3_prime_UTR_variant	2/2	2		ENSP00000427906

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 35

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

Nov 04, 2016

The c.335-3C>G variant in NKX2-5 has been identified by our laboratory to occur de novo in 1 individual with CHD and was absent from large population studies. This variant is located in the 3' splice region. Computational tools suggest tha t this change impacts splicing, though their accuracy is unknown. In summary, al though additional studies are required to fully establish its clinical significa nce, the c.335-3C>G variant is likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.46
CADD	Benign	22
DANN	Benign	0.89

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.98
SpliceAI score (max)		0.76		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.21		Position offset: -5
DS_AL_spliceai		0.76		Position offset: -3

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

Publications

LitVar

Other links and lift over

dbSNP: rs876657934; hg19: chr5-172660215;