chrX-48793871-C-T

Variant names:

• chrX-48793871-C-T
• rs781964937
• NM_002049.4:c.949C>T

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4 BS2

The NM_002049.4(GATA1):​c.949C>T​(p.Arg317Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000011 in 1,093,714 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 3 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R317Q) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 0.000011 (0 hom. 3 hem.)
• Consequence: GATA1 NM_002049.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3 O:1
• Conservation: PhyloP100: 0.255
• Publications: 2 publications found

Genes affected

GATA1 (HGNC:4170): (GATA binding protein 1) This gene encodes a protein which belongs to the GATA family of transcription factors. The protein plays an important role in erythroid development by regulating the switch of fetal hemoglobin to adult hemoglobin. Mutations in this gene have been associated with X-linked dyserythropoietic anemia and thrombocytopenia. [provided by RefSeq, Jul 2008]

GATA1 Gene-Disease associations (from GenCC):

• GATA1-Related X-Linked Cytopenia

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
• thrombocytopenia, X-linked, with or without dyserythropoietic anemia

  Inheritance: XL Classification: STRONG, MODERATE Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• beta-thalassemia-X-linked thrombocytopenia syndrome

  Inheritance: XL Classification: MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet
• Diamond-Blackfan anemia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• cutaneous porphyria

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• thrombocytopenia with congenital dyserythropoietic anemia

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
• X-linked dyserythropoetic anemia with abnormal platelets and neutropenia

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000232828 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.40698862).
• BS2: High Hemizygotes in GnomAdExome4 at 3 AR,XL,AD gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002049.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GATA1	NM_002049.4	MANE Select	c.949C>T	p.Arg317Trp	missense	Exon 6 of 6	NP_002040.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GATA1	ENST00000376670.9	TSL:1 MANE Select	c.949C>T	p.Arg317Trp	missense	Exon 6 of 6	ENSP00000365858.3
	GATA1	ENST00000696450.1		c.964C>T	p.Arg322Trp	missense	Exon 6 of 6	ENSP00000512637.1
	GATA1	ENST00000696452.1		c.739C>T	p.Arg247Trp	missense	Exon 5 of 5	ENSP00000512639.1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD2 exomes AF: 0.0000176 AC: 3 AN: 170222 AF XY: 0.0000529

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.000138

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000267

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000110 AC: 12 AN: 1093714 Hom.: 0 Cov.: 32 AF XY: 0.00000834 AC XY: 3 AN XY: 359510

African (AFR) AF: 0.00 AC: 0 AN: 26356

American (AMR) AF: 0.00 AC: 0 AN: 34707

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19298

East Asian (EAS) AF: 0.00 AC: 0 AN: 30101

South Asian (SAS) AF: 0.00 AC: 0 AN: 53160

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40214

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4114

European-Non Finnish (NFE) AF: 0.0000131 AC: 11 AN: 839833

Other (OTH) AF: 0.0000218 AC: 1 AN: 45931

GnomAD4 genome Cov.: 23

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Jun 30, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.949C>T (p.R317W) alteration is located in exon 6 (coding exon 5) of the GATA1 gene. This alteration results from a C to T substitution at nucleotide position 949, causing the arginine (R) at amino acid position 317 to be replaced by a tryptophan (W). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear.

not provided Uncertain:1

Jul 17, 2024

Revvity Omics, Revvity

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Diamond-Blackfan anemia;C1845837:GATA binding protein 1 related thrombocytopenia with dyserythropoiesis Uncertain:1

Jun 13, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 317 of the GATA1 protein (p.Arg317Trp). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with GATA1-related conditions. ClinVar contains an entry for this variant (Variation ID: 134463). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on GATA1 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

not specified Other:1

Sep 19, 2013

ITMI

Significance: not provided

Review Status: no classification provided

Collection Method: reference population

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.39
BayesDel_addAF	Uncertain	0.084	D
BayesDel_noAF	Benign	-0.12
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.81	D
FATHMM_MKL	Benign	0.57	D
LIST_S2	Uncertain	0.87	D
M_CAP	Pathogenic	0.45	D
MetaRNN	Benign	0.41	T
MetaSVM	Uncertain	0.54	D
MutationAssessor	Benign	0.34	N
PhyloP100		0.26
PrimateAI	Pathogenic	0.79	T
PROVEAN	Uncertain	-4.0	D
REVEL	Uncertain	0.30
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.40
MutPred		0.26		Loss of methylation at R317 (P = 0.0244)
MVP		0.77
MPC		0.088
ClinPred		0.71	D
GERP RS		1.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.74
gMVP		0.86
Mutation Taster		=93/7	polymorphism

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

Other links and lift over

dbSNP: rs781964937; hg19: chrX-48652278; COSMIC: COSV105309030;