NM_002055.5:c.930G>A

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM1BP4BS2

The NM_002055.5(GFAP):c.930G>A(p.Met310Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000106 in 1,610,784 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 Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000011 ( 0 hom. )

Consequence

GFAP
NM_002055.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 2.01

Publications

1 publications found

Variant links:

Genes affected

GFAP (HGNC:4235): (glial fibrillary acidic protein) This gene encodes one of the major intermediate filament proteins of mature astrocytes. It is used as a marker to distinguish astrocytes from other glial cells during development. Mutations in this gene cause Alexander disease, a rare disorder of astrocytes in the central nervous system. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Oct 2008]

GFAP Gene-Disease associations (from GenCC):

Alexander disease
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), G2P
Alexander disease type II
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

GFAP links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

PM1

In a region_of_interest Coil 2B (size 120) in uniprot entity GFAP_HUMAN there are 21 pathogenic changes around while only 5 benign (81%) in NM_002055.5

BP4

Computational evidence support a benign effect (MetaRNN=0.33661076).

BS2

High AC in GnomAdExome4 at 16 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GFAP	NM_002055.5 link	c.930G>A	p.Met310Ile	missense_variant	Exon 6 of 9	ENST00000588735.3	NP_002046.1	P14136-1
GFAP	NM_001363846.2 link	c.930G>A	p.Met310Ile	missense_variant	Exon 6 of 10		NP_001350775.1
GFAP	NM_001242376.3 link	c.930G>A	p.Met310Ile	missense_variant	Exon 6 of 7		NP_001229305.1	P14136-2
GFAP	NM_001131019.3 link	c.930G>A	p.Met310Ile	missense_variant	Exon 6 of 8		NP_001124491.1	P14136-3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GFAP	ENST00000588735.3 link	c.930G>A	p.Met310Ile	missense_variant	Exon 6 of 9	1	NM_002055.5	ENSP00000466598.2		P14136-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152224

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000403

AC:

AN:

248350

AF XY:

0.00000744

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000110

AC:

AN:

1458442

Hom.:

Cov.:

AF XY:

0.00000965

AC XY:

AN XY:

725354

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33436

American (AMR)

AF:

0.00

AC:

AN:

44684

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25956

East Asian (EAS)

AF:

0.00

AC:

AN:

39680

South Asian (SAS)

AF:

0.00

AC:

AN:

85992

European-Finnish (FIN)

AF:

0.0000191

AC:

AN:

52458

Middle Eastern (MID)

AF:

0.000191

AC:

AN:

5242

European-Non Finnish (NFE)

AF:

0.00000720

AC:

AN:

1110762

Other (OTH)

AF:

0.0000996

AC:

AN:

60232

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.497

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.00000656

AC:

AN:

152342

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74494

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41592

American (AMR)

AF:

0.00

AC:

AN:

15308

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.000193

AC:

AN:

5180

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68014

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.0000165

AC:

Asia WGS

AF:

0.000866

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Alexander disease

Uncertain:2

Jan 12, 2022

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:research

- -

Mar 05, 2018

Genomic Research Center, Shahid Beheshti University of Medical Sciences

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not specified

Uncertain:1

May 06, 2025

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

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: GFAP c.930G>A (p.Met310Ile) results in a conservative amino acid change in the encoded protein sequence. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change. The variant allele was found at a frequency of 4e-06 in 248350 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. To our knowledge, no occurrence of c.930G>A in individuals affected with Alexander Disease and no experimental evidence demonstrating its impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 548570). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Inborn genetic diseases

Uncertain:1

Aug 10, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.930G>A (p.M310I) alteration is located in exon 6 (coding exon 6) of the GFAP gene. This alteration results from a G to A substitution at nucleotide position 930, causing the methionine (M) at amino acid position 310 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.46

BayesDel_addAF

Benign

0.00021

BayesDel_noAF

Benign

-0.14

CADD

Pathogenic

(source)

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.66

.;D;.;.;.;.

Eigen

Benign

-0.11

Eigen_PC

Benign

0.0084

FATHMM_MKL

Uncertain

0.76

LIST_S2

Uncertain

0.92

D;D;D;D;D;D

M_CAP

Uncertain

0.10

MetaRNN

Benign

0.34

T;T;T;T;T;T

MetaSVM

Uncertain

-0.13

MutationAssessor

Benign

0.44

.;N;.;.;N;N

PhyloP100

2.0

PrimateAI

Uncertain

0.61

PROVEAN

Uncertain

-2.6

.;.;D;.;D;.

REVEL

Uncertain

0.47

Sift

Benign

0.17

.;.;T;.;T;.

Sift4G

Benign

0.27

.;.;T;.;T;.

Polyphen

0.49

.;P;.;.;.;.

Vest4

0.47

MutPred

0.54

Loss of MoRF binding (P = 0.2146);Loss of MoRF binding (P = 0.2146);Loss of MoRF binding (P = 0.2146);.;Loss of MoRF binding (P = 0.2146);Loss of MoRF binding (P = 0.2146);

MVP

0.99

ClinPred

0.65

GERP RS

3.6

PromoterAI

0.075

Neutral

(source)

Varity_R

0.63

gMVP

0.74

Mutation Taster

=84/16

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

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

Publications

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NM_002055.5:c.930G>A

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over