chr17-44911293-A-G

Position:

• chr17-44911293-A-G

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM1 PM2 PP3_Strong PP5_Moderate

The ENST00000588735.3(GFAP):​c.1070T>C​(p.Leu357Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. L357L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GFAP ENST00000588735.3 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2 O:1
• Conservation: PhyloP100: 9.32

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]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PM1: In a hotspot region, there are 7 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 9 uncertain in ENST00000588735.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.975
• PP5: Variant 17-44911293-A-G is Pathogenic according to our data. Variant chr17-44911293-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 66428.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GFAP	NM_002055.5	c.1070T>C	p.Leu357Pro	missense_variant	6/9	ENST00000588735.3	NP_002046.1
GFAP	NM_001363846.2	c.1070T>C	p.Leu357Pro	missense_variant	6/10		NP_001350775.1
GFAP	NM_001242376.3	c.1070T>C	p.Leu357Pro	missense_variant	6/7		NP_001229305.1
GFAP	NM_001131019.3	c.1070T>C	p.Leu357Pro	missense_variant	6/8		NP_001124491.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GFAP	ENST00000588735.3	c.1070T>C	p.Leu357Pro	missense_variant	6/9	1	NM_002055.5	ENSP00000466598	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1 Other:1

not provided, no classification provided	literature only	Epithelial Biology; Institute of Medical Biology, Singapore	-	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen	Oct 23, 2020	- -

Alexander disease Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

GeneReviews

Jan 08, 2015

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.51	D
BayesDel_noAF	Pathogenic	0.49
CADD	Pathogenic	34
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.96	.;D;.;.;.;.;.;D;.
Eigen	Pathogenic	0.85
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.90	D;D;D;D;D;D;D;T;T
M_CAP	Pathogenic	0.62	D
MetaRNN	Pathogenic	0.98	D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	0.96	D
MutationAssessor	Pathogenic	3.5	.;M;.;.;.;M;M;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.80	T
PROVEAN	Uncertain	-4.2	.;.;D;.;.;D;.;.;.
REVEL	Pathogenic	0.95
Sift	Pathogenic	0.0	.;.;D;.;.;D;.;.;.
Sift4G	Pathogenic	0.0	.;.;D;.;.;D;.;D;.
Polyphen		1.0	.;D;.;.;.;.;.;.;.
Vest4		0.96, 0.96
MutPred		0.89		Loss of stability (P = 0.0012);Loss of stability (P = 0.0012);Loss of stability (P = 0.0012);.;.;Loss of stability (P = 0.0012);Loss of stability (P = 0.0012);.;.;
MVP		0.97
MPC		1.6
ClinPred		1.0	D
GERP RS		4.3
Varity_R		0.98
gMVP		0.99

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

Other links and lift over

dbSNP: rs267607515; hg19: chr17-42988661;