NM_001101.5:c.359C>T

Variant names:

• chr7-5529165-G-A
• rs587779774
• NM_001101.5:c.359C>T

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PM1 PM2 PP2 PP3_Strong PP5

The NM_001101.5(ACTB):​c.359C>T​(p.Thr120Ile) 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. Variant has been reported in ClinVar as Pathogenic (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T120S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: ACTB NM_001101.5 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:2 O:1
• Conservation: PhyloP100: 9.81
• Publications: 5 publications found

Genes affected

ACTB (HGNC:132): (actin beta) This gene encodes one of six different actin proteins. Actins are highly conserved proteins that are involved in cell motility, structure, integrity, and intercellular signaling. The encoded protein is a major constituent of the contractile apparatus and one of the two nonmuscle cytoskeletal actins that are ubiquitously expressed. Mutations in this gene cause Baraitser-Winter syndrome 1, which is characterized by intellectual disability with a distinctive facial appearance in human patients. Numerous pseudogenes of this gene have been identified throughout the human genome. [provided by RefSeq, Aug 2017]

ACTB Gene-Disease associations (from GenCC):

• Baraitser-Winter cerebrofrontofacial syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• Baraitser-Winter syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, PanelApp Australia, G2P
• developmental malformations-deafness-dystonia syndrome

  Inheritance: AD Classification: STRONG, SUPPORTIVE, LIMITED Submitted by: Orphanet, PanelApp Australia, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Illumina
• ACTB-associated syndromic thrombocytopenia

  Inheritance: AD Classification: MODERATE Submitted by: ClinGen, Ambry Genetics

ACMG classification

Our verdict: Pathogenic. The variant received 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, 3 uncertain in NM_001101.5
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the ACTB gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 94 curated pathogenic missense variants (we use a threshold of 10). The gene has 13 curated benign missense variants. Trascript score misZ: 7.6852 (above the threshold of 3.09). GenCC associations: The gene is linked to Baraitser-Winter syndrome 1, developmental malformations-deafness-dystonia syndrome, Baraitser-Winter cerebrofrontofacial syndrome, ACTB-associated syndromic thrombocytopenia.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.941
• PP5: Variant 7-5529165-G-A is Pathogenic according to our data. Variant chr7-5529165-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 127168.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ACTB	NM_001101.5	c.359C>T	p.Thr120Ile	missense_variant	Exon 3 of 6	ENST00000646664.1	NP_001092.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ACTB	ENST00000646664.1	c.359C>T	p.Thr120Ile	missense_variant	Exon 3 of 6		NM_001101.5	ENSP00000494750.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: no assertion criteria provided

Submissions by phenotype

Baraitser-Winter syndrome 1 Pathogenic:2

Apr 15, 2014

Department of Genetics, Robert DEBRE University Hospital

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jul 23, 2014

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Baraitser-Winter syndrome Other:1

-

GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

Assoc w/severe phenotype [Di Donato et al 2014] -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.91
BayesDel_addAF	Pathogenic	0.43	D
BayesDel_noAF	Pathogenic	0.38
CADD	Pathogenic	32
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.91	D;D;D;.;.;D
Eigen	Uncertain	0.55
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.94	.;.;D;D;D;D
M_CAP	Pathogenic	0.78	D
MetaRNN	Pathogenic	0.94	D;D;D;D;D;D
MetaSVM	Pathogenic	0.97	D
MutationAssessor	Uncertain	2.0	M;M;M;.;.;.
PhyloP100		9.8
PrimateAI	Pathogenic	0.86	D
PROVEAN	Uncertain	-4.3	D;.;.;.;.;D
REVEL	Pathogenic	0.95
Sift4G	Uncertain	0.045	D;.;.;.;.;.
Polyphen		0.47	P;P;P;.;.;.
Vest4		0.99
MutPred		0.79		Loss of disorder (P = 0.0587);Loss of disorder (P = 0.0587);Loss of disorder (P = 0.0587);Loss of disorder (P = 0.0587);Loss of disorder (P = 0.0587);Loss of disorder (P = 0.0587);
MVP		0.98
MPC		3.3
ClinPred		0.99	D
GERP RS		4.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.93
gMVP		0.97
Mutation Taster		=7/93	disease causing (ClinVar)

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: rs587779774; hg19: chr7-5568796;