dbSNP rs267607504: GFAP:p.Met74Thr (chr17-44915266-A-G) – ACMG Classification: Uncertain_significance (5 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM1PM2PP3

The NM_002055.5(GFAP):c.221T>C(p.Met74Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as not provided (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M74I) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Consequence

GFAP
NM_002055.5 missense

Scores

Clinical Significance

not provided no classification provided O:2

Conservation

PhyloP100: 2.28

Publications

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

GFAP links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

PM1

In a hotspot region, there are 22 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 13 uncertain in NM_002055.5

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.79

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002055.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
GFAP	NM_002055.5	MANE Select	c.221T>C	p.Met74Thr	missense	Exon 1 of 9	NP_002046.1	P14136-1
GFAP	NM_001363846.2		c.221T>C	p.Met74Thr	missense	Exon 1 of 10	NP_001350775.1	A0A1X7SBR3
GFAP	NM_001242376.3		c.221T>C	p.Met74Thr	missense	Exon 1 of 7	NP_001229305.1	P14136-2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
GFAP	ENST00000588735.3	TSL:1 MANE Select	c.221T>C	p.Met74Thr	missense	Exon 1 of 9	ENSP00000466598.2	P14136-1
GFAP	ENST00000591327.2	TSL:1	n.234T>C		non_coding_transcript_exon	Exon 1 of 5
GFAP	ENST00000639277.1	TSL:5	c.221T>C	p.Met74Thr	missense	Exon 1 of 10	ENSP00000492432.1	A0A1W2PR46

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Cov.:

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000611

Hom.:

ClinVar

ClinVar submissions

Significance:not provided

Revision:no classification provided

View on ClinVar

Pathogenic

VUS

Benign

Condition

Alexander disease (1)

not provided (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.69

BayesDel_addAF

Pathogenic

0.28

BayesDel_noAF

Pathogenic

0.16

CADD

Uncertain

(source)

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.63

Eigen

Benign

0.0047

Eigen_PC

Benign

0.072

FATHMM_MKL

Uncertain

0.93

LIST_S2

Uncertain

0.90

M_CAP

Uncertain

0.15

MetaRNN

Pathogenic

0.79

MetaSVM

Uncertain

0.12

MutationAssessor

Benign

1.9

PhyloP100

2.3

PrimateAI

Uncertain

0.78

PROVEAN

Benign

-1.7

REVEL

Pathogenic

0.69

Sift

Uncertain

0.0010

Sift4G

Uncertain

0.021

Polyphen

0.038

Vest4

0.66

MVP

0.98

MPC

0.72

ClinPred

0.88

GERP RS

3.7

PromoterAI

0.090

Neutral

(source)

Varity_R

0.71

gMVP

0.83

Mutation Taster

=3/97

disease causing (ClinVar)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over