chr17-44915282-C-T

Position:

• chr17-44915282-C-T

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_002055.5(GFAP):​c.205G>A​(p.Glu69Lys) 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 (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: GFAP NM_002055.5 missense
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:2 O:1
• Conservation: PhyloP100: 7.87

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 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.977
• PP5: Variant 17-44915282-C-T is Pathogenic according to our data. Variant chr17-44915282-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 190333.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GFAP	NM_002055.5	c.205G>A	p.Glu69Lys	missense_variant	1/9	ENST00000588735.3	NP_002046.1
GFAP	NM_001363846.2	c.205G>A	p.Glu69Lys	missense_variant	1/10		NP_001350775.1
GFAP	NM_001242376.3	c.205G>A	p.Glu69Lys	missense_variant	1/7		NP_001229305.1
GFAP	NM_001131019.3	c.205G>A	p.Glu69Lys	missense_variant	1/8		NP_001124491.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GFAP	ENST00000588735.3	c.205G>A	p.Glu69Lys	missense_variant	1/9	1	NM_002055.5	ENSP00000466598	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Alexander disease Pathogenic:1 Other:1

not provided, no classification provided	literature only	GeneReviews	-	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Centre for Inherited Metabolic Diseases, Karolinska University Hospital	Feb 27, 2024	- -

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

May 01, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.93
BayesDel_addAF	Pathogenic	0.51	D
BayesDel_noAF	Pathogenic	0.50
CADD	Pathogenic	31
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.79	.;D;.;.;.;D;.;.;.
Eigen	Pathogenic	0.87
Eigen_PC	Pathogenic	0.79
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.97	D;D;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.53	D
MetaRNN	Pathogenic	0.98	D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.5	.;H;.;H;H;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.83	D
PROVEAN	Uncertain	-3.3	.;.;D;D;.;.;.;.;.
REVEL	Pathogenic	0.94
Sift	Pathogenic	0.0	.;.;D;D;.;.;.;.;.
Sift4G	Uncertain	0.014	.;.;D;D;.;D;D;.;.
Polyphen		1.0	.;D;.;.;.;.;.;.;.
Vest4		0.97, 0.97, 0.98
MutPred		0.90		Gain of MoRF binding (P = 0.0056);Gain of MoRF binding (P = 0.0056);Gain of MoRF binding (P = 0.0056);Gain of MoRF binding (P = 0.0056);Gain of MoRF binding (P = 0.0056);Gain of MoRF binding (P = 0.0056);Gain of MoRF binding (P = 0.0056);Gain of MoRF binding (P = 0.0056);Gain of MoRF binding (P = 0.0056);
MVP		1.0
MPC		1.3
ClinPred		1.0	D
GERP RS		4.7
Varity_R		0.96
gMVP		1.0

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

LitVar

Other links and lift over

dbSNP: rs797044570; hg19: chr17-42992650;