rs59101996

Positions:

• chr8-24956070-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The ENST00000610854.2(NEFL):​c.446C>T​(p.Ala149Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000138 in 1,450,908 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. A149A) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: NEFL ENST00000610854.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1 O:2
• Conservation: PhyloP100: 6.85

Genes affected

NEFL (HGNC:7739): (neurofilament light chain) Neurofilaments are type IV intermediate filament heteropolymers composed of light, medium, and heavy chains. Neurofilaments comprise the axoskeleton and they functionally maintain the neuronal caliber. They may also play a role in intracellular transport to axons and dendrites. This gene encodes the light chain neurofilament protein. Mutations in this gene cause Charcot-Marie-Tooth disease types 1F (CMT1F) and 2E (CMT2E), disorders of the peripheral nervous system that are characterized by distinct neuropathies. A pseudogene has been identified on chromosome Y. [provided by RefSeq, Oct 2008]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NEFL	NM_006158.5	c.446C>T	p.Ala149Val	missense_variant	1/4	ENST00000610854.2	NP_006149.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NEFL	ENST00000610854.2	c.446C>T	p.Ala149Val	missense_variant	1/4	1	NM_006158.5	ENSP00000482169	P1
	ENST00000607735.2	n.130G>A		non_coding_transcript_exon_variant	1/1
NEFL	ENST00000615973.1	n.652C>T		non_coding_transcript_exon_variant	1/1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000138 AC: 2 AN: 1450908 Hom.: 0 Cov.: 37 AF XY: 0.00000277 AC XY: 2 AN XY: 721762

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: 0.0000117

Gnomad4 FIN exome AF: 0.0000214

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1 Other:2

Revision: criteria provided, single submitter

Submissions by phenotype

Charcot-Marie-Tooth disease type 2E Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 11, 2020

This sequence change replaces alanine with valine at codon 149 of the NEFL protein (p.Ala149Val). The alanine residue is highly conserved and there is a small physicochemical difference between alanine and valine. This variant is not present in population databases (ExAC no frequency). This variant has been observed in individual(s) with autosomal dominant Charcot-Marie-Tooth disease (PMID: 12477167). This variant has also been reported as c.443C>T (p.Ala148Val). ClinVar contains an entry for this variant (Variation ID: 41237). This variant has been reported to affect NEFL protein function (PMID: 19123978). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Charcot-Marie-Tooth disease type 1F Other:1

not provided, no classification provided

literature only

GeneReviews

-

- -

not provided Other:1

not provided, no classification provided

literature only

Epithelial Biology; Institute of Medical Biology, Singapore

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.0
CADD	Pathogenic	35
DANN	Benign	0.97
DEOGEN2	Uncertain	0.74	D;.;T
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.43	T;T;T
MetaRNN	Uncertain	0.66	D;D;D
PrimateAI	Uncertain	0.55	T
Sift4G	Benign	0.23	T;.;T
Polyphen		0.99	D;.;.
Vest4		0.52
MVP		0.78
GERP RS		5.5
Varity_R		0.65
gMVP		0.28

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: rs59101996; hg19: chr8-24813584; COSMIC: COSV55338106; COSMIC: COSV55338106;