20-36935048-G-T

Variant names:

• chr20-36935048-G-T
• rs267607027
• NM_015474.4:c.490C>A
• SAMHD1 p.Arg164Arg

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP6_Moderate

The NM_015474.4(SAMHD1):​c.490C>A​(p.Arg164Arg) variant causes a synonymous change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: SAMHD1 NM_015474.4 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 5.63
• Publications: 14 publications found

Genes affected

SAMHD1 (HGNC:15925): (SAM and HD domain containing deoxynucleoside triphosphate triphosphohydrolase 1) This gene may play a role in regulation of the innate immune response. The encoded protein is upregulated in response to viral infection and may be involved in mediation of tumor necrosis factor-alpha proinflammatory responses. Mutations in this gene have been associated with Aicardi-Goutieres syndrome. [provided by RefSeq, Mar 2010]

SAMHD1 Gene-Disease associations (from GenCC):

• Aicardi-Goutieres syndrome 5

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, G2P, PanelApp Australia, Ambry Genetics
• SAMHD1-related type 1 interferonopathy

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• Moyamoya disease

  Inheritance: AR Classification: STRONG Submitted by: Genomics England PanelApp
• Aicardi-Goutieres syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial chilblain lupus

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• chilblain lupus 2

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• chilblain lupus

  Inheritance: AD Classification: NO_KNOWN Submitted by: Illumina

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP6: Variant 20-36935048-G-T is Benign according to our data. Variant chr20-36935048-G-T is described in ClinVar as Likely_benign. ClinVar VariationId is 743983.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_015474.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SAMHD1	NM_015474.4	MANE Select	c.490C>A	p.Arg164Arg	synonymous	Exon 4 of 16	NP_056289.2
	SAMHD1	NM_001363729.2		c.490C>A	p.Arg164Arg	synonymous	Exon 4 of 15	NP_001350658.1	Q9Y3Z3-4
	SAMHD1	NM_001363733.2		c.490C>A	p.Arg164Arg	synonymous	Exon 4 of 16	NP_001350662.1	A0A2R8YCS7

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SAMHD1	ENST00000646673.2	MANE Select	c.490C>A	p.Arg164Arg	synonymous	Exon 4 of 16	ENSP00000493536.2	Q9Y3Z3-1
	SAMHD1	ENST00000262878.5	TSL:1	c.490C>A	p.Arg164Arg	synonymous	Exon 4 of 15	ENSP00000262878.5	Q9Y3Z3-4
	SAMHD1	ENST00000866371.1		c.490C>A	p.Arg164Arg	synonymous	Exon 4 of 17	ENSP00000536430.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 31

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	Aicardi-Goutieres syndrome 5 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.32
CADD	Benign	12
DANN	Benign	0.66
PhyloP100		5.6

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.35		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.35		Position offset: -19

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs267607027;

hg19: chr20-35563451;