16-74719125-C-T

Position:

chr16-74719125-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4

The ENST00000219368.8(FA2H):c.649G>A(p.Gly217Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000254 in 1,613,804 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000025 ( 0 hom. )

Consequence

FA2H
ENST00000219368.8 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:4

Conservation

PhyloP100: 1.18

Variant links:

Genes affected

FA2H (HGNC:21197): (fatty acid 2-hydroxylase) This gene encodes a protein that catalyzes the synthesis of 2-hydroxysphingolipids, a subset of sphingolipids that contain 2-hydroxy fatty acids. Sphingolipids play roles in many cellular processes and their structural diversity arises from modification of the hydrophobic ceramide moiety, such as by 2-hydroxylation of the N-acyl chain, and the existence of many different head groups. Mutations in this gene have been associated with leukodystrophy dysmyelinating with spastic paraparesis with or without dystonia.[provided by RefSeq, Mar 2010]

FA2H links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.39783022).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
FA2H	NM_024306.5 linkuse as main transcript	c.649G>A	p.Gly217Arg	missense_variant	5/7	ENST00000219368.8	NP_077282.3
FA2H	XM_011523317.4 linkuse as main transcript	c.649G>A	p.Gly217Arg	missense_variant	5/6		XP_011521619.1
FA2H	XM_011523319.3 linkuse as main transcript	c.409G>A	p.Gly137Arg	missense_variant	5/7		XP_011521621.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FA2H	ENST00000219368.8 linkuse as main transcript	c.649G>A	p.Gly217Arg	missense_variant	5/7	1	NM_024306.5	ENSP00000219368	P1	Q7L5A8-1
FA2H	ENST00000569949.1 linkuse as main transcript	c.451G>A	p.Gly151Arg	missense_variant	5/5	4		ENSP00000464576
FA2H	ENST00000567683.5 linkuse as main transcript	c.399G>A	p.Pro133=	synonymous_variant, NMD_transcript_variant	3/5	2		ENSP00000455126

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152202

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000482

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000797

AC:

AN:

250852

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135598

show subpopulations

Gnomad AFR exome

AF:

0.0000616

Gnomad AMR exome

AF:

0.0000289

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000253

AC:

AN:

1461484

Hom.:

Cov.:

AF XY:

0.0000234

AC XY:

AN XY:

727020

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.0000447

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:

0.0000279

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152320

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

74486

show subpopulations

Gnomad4 AFR

AF:

0.0000481

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000189

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:4

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hereditary spastic paraplegia 35

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Paris Brain Institute, Inserm - ICM

- -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Apr 03, 2024

Variant summary: FA2H c.649G>A (p.Gly217Arg) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 8e-06 in 250852 control chromosomes (gnomAD). c.649G>A has been reported in the literature as a homozygous genotype in a comprehensively genotyped individual of Pakistani ethnicity affected with Hereditary Spastic Paraplegia 35 (Chrestian_2017) and as an uninformative genotype (i.e. zygosity not specified) in at least one other individual affected with Hereditary Spastic Paraplegia who underwent multigene panel testing (Mereaux_2022). These data indicate that the variant may be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 27957547, 34983064). ClinVar contains an entry for this variant (Variation ID: 241463). Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic. -

Spastic paraplegia

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 08, 2024

This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 217 of the FA2H protein (p.Gly217Arg). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This missense change has been observed in individuals with hereditary spastic paraplegia (PMID: 27957547; Invitae). ClinVar contains an entry for this variant (Variation ID: 241463). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt FA2H protein function with a negative predictive value of 80%. 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. -

Hereditary spastic paraplegia

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Dec 12, 2016

- -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Mayo Clinic Laboratories, Mayo Clinic

May 15, 2023

PM2 -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.38

BayesDel_addAF

Uncertain

0.13

BayesDel_noAF

Uncertain

-0.060

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.50

T;T

Eigen

Benign

0.052

Eigen_PC

Benign

0.041

FATHMM_MKL

Benign

0.42

LIST_S2

Uncertain

0.90

D;D

M_CAP

Uncertain

0.14

MetaRNN

Benign

0.40

T;T

MetaSVM

Benign

-0.45

MutationAssessor

Uncertain

2.6

M;.

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.44

PROVEAN

Benign

-1.8

N;.

REVEL

Uncertain

0.53

Sift

Benign

0.32

T;.

Sift4G

Benign

0.35

T;.

Polyphen

0.92

P;.

Vest4

0.87

MutPred

0.69

Gain of helix (P = 0.0696);.;

MVP

0.92

MPC

0.40

ClinPred

0.51

GERP RS

3.5

Varity_R

0.35

gMVP

0.82

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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

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