22-29480264-T-C

Position:

• chr22-29480264-T-C

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_021076.4(NEFH):​c.2T>C​(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000221 in 1,359,470 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000022 (0 hom.)
• Consequence: NEFH NM_021076.4 start_lost
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.189

Genes affected

NEFH (HGNC:7737): (neurofilament heavy chain) Neurofilaments are type IV intermediate filament heteropolymers composed of light, medium, and heavy chains. Neurofilaments comprise the axoskeleton and functionally maintain neuronal caliber. They may also play a role in intracellular transport to axons and dendrites. This gene encodes the heavy neurofilament protein. This protein is commonly used as a biomarker of neuronal damage and susceptibility to amyotrophic lateral sclerosis (ALS) has been associated with mutations in this gene. [provided by RefSeq, Oct 2008]

(HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NEFH	NM_021076.4	c.2T>C	p.Met1?	start_lost	1/4	ENST00000310624.7	NP_066554.2
NEFH	XM_011530200.3	c.2T>C	p.Met1?	start_lost	1/5		XP_011528502.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NEFH	ENST00000310624.7	c.2T>C	p.Met1?	start_lost	1/4	1	NM_021076.4	ENSP00000311997	P1
	ENST00000634116.1	n.321-22A>G		intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000221 AC: 3 AN: 1359470 Hom.: 0 Cov.: 33 AF XY: 0.00000298 AC XY: 2 AN XY: 670908

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: 0.00000280

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 25, 2023

Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. This variant has not been reported in the literature in individuals affected with NEFH-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change affects the initiator methionine of the NEFH mRNA. The next in-frame methionine is located at codon 2. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.058	T
BayesDel_noAF	Benign	-0.32
CADD	Benign	15
DANN	Benign	0.86
Eigen	Benign	-0.98
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.056	N
M_CAP	Pathogenic	0.97	D
MetaRNN	Pathogenic	0.84	D
MetaSVM	Benign	-0.79	T
MutationTaster	Benign	0.98	N
PROVEAN	Benign	-0.70	N
REVEL	Uncertain	0.30
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Vest4		0.32
MutPred		0.88		Gain of glycosylation at M1 (P = 0.0044);
MVP		0.39
ClinPred		0.36	T
GERP RS		-3.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
gMVP		0.59

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr22-29876253;