1-204954911-G-A

Position:

• chr1-204954911-G-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_001005388.3(NFASC):​c.495G>A​(p.Pro165=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000621 in 1,614,020 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0033 (1 hom., cov: 32)
  • Exomes 𝑓: 0.00035 (3 hom.)
• Consequence: NFASC NM_001005388.3 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: -4.40

Genes affected

NFASC (HGNC:29866): (neurofascin) This gene encodes an L1 family immunoglobulin cell adhesion molecule with multiple IGcam and fibronectin domains. The protein functions in neurite outgrowth, neurite fasciculation, and organization of the axon initial segment (AIS) and nodes of Ranvier on axons during early development. Both the AIS and nodes of Ranvier contain high densities of voltage-gated Na+ (Nav) channels which are clustered by interactions with cytoskeletal and scaffolding proteins including this protein, gliomedin, ankyrin 3 (ankyrin-G), and betaIV spectrin. This protein links the AIS extracellular matrix to the intracellular cytoskeleton. This gene undergoes extensive alternative splicing, and the full-length nature of some variants has not been determined.[provided by RefSeq, May 2009]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.65).
• BP6: Variant 1-204954911-G-A is Benign according to our data. Variant chr1-204954911-G-A is described in ClinVar as [Benign]. Clinvar id is 719373.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00325 (495/152184) while in subpopulation AFR AF= 0.0111 (462/41522). AF 95% confidence interval is 0.0103. There are 1 homozygotes in gnomad4. There are 225 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAdExome4 at 3 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NFASC	NM_001005388.3	c.495G>A	p.Pro165=	synonymous_variant	7/30	ENST00000339876.11
NFASC	NM_001160331.2	c.477G>A	p.Pro159=	synonymous_variant	5/28	ENST00000539706.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NFASC	ENST00000339876.11	c.495G>A	p.Pro165=	synonymous_variant	7/30	5	NM_001005388.3
NFASC	ENST00000539706.6	c.477G>A	p.Pro159=	synonymous_variant	5/28	5	NM_001160331.2	A2

Frequencies

GnomAD3 genomes AF: 0.00325 AC: 494 AN: 152066 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.0111

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00164

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.00287

GnomAD3 exomes AF: 0.000815 AC: 205 AN: 251462 Hom.: 0 AF XY: 0.000692 AC XY: 94 AN XY: 135904

Gnomad AFR exome AF: 0.0116

Gnomad AMR exome AF: 0.000260

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000653

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000352

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.000348 AC: 508 AN: 1461836 Hom.: 3 Cov.: 33 AF XY: 0.000311 AC XY: 226 AN XY: 727216

Gnomad4 AFR exome AF: 0.0122

Gnomad4 AMR exome AF: 0.000402

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000580

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000198

Gnomad4 OTH exome AF: 0.000828

GnomAD4 genome AF: 0.00325 AC: 495 AN: 152184 Hom.: 1 Cov.: 32 AF XY: 0.00302 AC XY: 225 AN XY: 74388

Gnomad4 AFR AF: 0.0111

Gnomad4 AMR AF: 0.00164

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.00284

Alfa AF: 0.00132 Hom.: 1

Bravo AF: 0.00373

EpiCase AF: 0.000109

EpiControl AF: 0.0000593

ClinVar

Significance: Benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Apr 26, 2018	- -

NFASC-related disorder Benign:1

Benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

May 01, 2019

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.65
CADD	Benign	1.9
DANN	Benign	0.70

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: rs77635708; hg19: chr1-204924039;