Variant chr1-77916129-CTGAGG-C details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 10P and 4B. PVS1PM2BS2

The NM_144573.4(NEXN):c.25_27+2del variant causes a splice donor, coding sequence change. The variant allele was found at a frequency of 0.00000344 in 1,452,972 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000034 ( 0 hom. )

Consequence

NEXN
NM_144573.4 splice_donor, coding_sequence

Scores

Not classified

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 6.37

Variant links:

Genes affected

NEXN (HGNC:29557): (nexilin F-actin binding protein) This gene encodes a filamentous actin-binding protein that may function in cell adhesion and migration. Mutations in this gene have been associated with dilated cardiomyopathy, also known as CMD1CC. Alternatively spliced transcript variants have been described.[provided by RefSeq, Feb 2010]

NEXN links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PVS1

Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.

PM2

Very rare variant in population databases, with high coverage;

BS2

High AC in GnomAdExome4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NEXN	NM_144573.4 linkuse as main transcript	c.25_27+2del		splice_donor_variant, coding_sequence_variant	2/13	ENST00000334785.12

Ensembl

Gene	Transcript	HGVSc	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NEXN	ENST00000334785.12 linkuse as main transcript	c.25_27+2del	splice_donor_variant, coding_sequence_variant	2/13	1	NM_144573.4	P3	Q0ZGT2-1
NEXN	ENST00000401035.7 linkuse as main transcript	c.25_27+2del	splice_donor_variant, coding_sequence_variant	2/9	1
NEXN	ENST00000330010.12 linkuse as main transcript	c.25_27+2del	splice_donor_variant, coding_sequence_variant	2/12	2		A1	Q0ZGT2-4
NEXN	ENST00000440324.5 linkuse as main transcript	c.25_27+2del	splice_donor_variant, coding_sequence_variant	2/10	5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000818

AC:

AN:

244582

Hom.:

AF XY:

0.00

AC XY:

AN XY:

132640

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000181

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000344

AC:

AN:

1452972

Hom.:

AF XY:

0.00000277

AC XY:

AN XY:

722790

show subpopulations

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:

0.00000452

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 09, 2023

The c.25_27+2delGAGGT variant results from a deletion of 5 nucleotides between positions 25 and 27+2 and involves the canonical splice donor site after coding exon 1 of the NEXN gene. This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). The canonical splice donor site is highly conserved in available vertebrate species. In silico splice site analysis predicts that this alteration will weaken the native splice donor site. Alterations that disrupt the canonical splice site are expected to cause aberrant splicing, resulting in an abnormal protein or a transcript that is subject to nonsense-mediated mRNA decay. Although biallelic loss of function alterations in NEXN have been associated with autosomal recessive NEXN-related cardiomyopathy, haploinsufficiency for NEXN has not been clearly established as a mechanism of disease for autosomal dominant NEXN-related cardiomyopathy. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over