chr17-44907009-G-A

Position:

• chr17-44907009-G-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_002055.5(GFAP):​c.*338C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.124 in 421,990 control chromosomes in the GnomAD database, including 3,739 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.14 (1694 hom., cov: 32)
  • Exomes 𝑓: 0.12 (2045 hom.)
• Consequence: GFAP NM_002055.5 3_prime_UTR
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.261

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 Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.87).
• BP6: Variant 17-44907009-G-A is Benign according to our data. Variant chr17-44907009-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 323604.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.202 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GFAP	NM_002055.5	c.*338C>T		3_prime_UTR_variant	9/9	ENST00000588735.3
GFAP	NM_001363846.2	c.*338C>T		3_prime_UTR_variant	10/10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GFAP	ENST00000588735.3	c.*338C>T		3_prime_UTR_variant	9/9	1	NM_002055.5	P1

Frequencies

GnomAD3 genomes AF: 0.140 AC: 21309 AN: 152002 Hom.: 1686 Cov.: 32

Gnomad AFR AF: 0.206

Gnomad AMI AF: 0.189

Gnomad AMR AF: 0.0867

Gnomad ASJ AF: 0.153

Gnomad EAS AF: 0.143

Gnomad SAS AF: 0.0778

Gnomad FIN AF: 0.113

Gnomad MID AF: 0.0506

Gnomad NFE AF: 0.121

Gnomad OTH AF: 0.111

GnomAD4 exome AF: 0.115 AC: 31054 AN: 269870 Hom.: 2045 Cov.: 0 AF XY: 0.112 AC XY: 15968 AN XY: 142570

Gnomad4 AFR exome AF: 0.205

Gnomad4 AMR exome AF: 0.0880

Gnomad4 ASJ exome AF: 0.139

Gnomad4 EAS exome AF: 0.145

Gnomad4 SAS exome AF: 0.0783

Gnomad4 FIN exome AF: 0.106

Gnomad4 NFE exome AF: 0.118

Gnomad4 OTH exome AF: 0.114

GnomAD4 genome AF: 0.140 AC: 21331 AN: 152120 Hom.: 1694 Cov.: 32 AF XY: 0.138 AC XY: 10238 AN XY: 74368

Gnomad4 AFR AF: 0.205

Gnomad4 AMR AF: 0.0873

Gnomad4 ASJ AF: 0.153

Gnomad4 EAS AF: 0.142

Gnomad4 SAS AF: 0.0780

Gnomad4 FIN AF: 0.113

Gnomad4 NFE AF: 0.121

Gnomad4 OTH AF: 0.110

Alfa AF: 0.125 Hom.: 1228

Bravo AF: 0.144

Asia WGS AF: 0.116 AC: 403 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary ciliary dyskinesia Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.87
CADD	Benign	2.9
DANN	Benign	0.64

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: rs8067254; hg19: chr17-42984377;