chr7-5528556-A-G

Variant names:

• chr7-5528556-A-G
• rs1554329331
• NM_001101.5:c.527T>C

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PM1 PM2 PP2 PP3_Moderate PP5_Moderate

The NM_001101.5(ACTB):​c.527T>C​(p.Leu176Pro) 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 Likely pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. L176L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: ACTB NM_001101.5 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 8.98
• Publications: 0 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: Likely_pathogenic. The variant received 9 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 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, 0.878
• PP5: Variant 7-5528556-A-G is Pathogenic according to our data. Variant chr7-5528556-A-G is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 446430.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001101.5. 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
	ACTB	NM_001101.5	MANE Select	c.527T>C	p.Leu176Pro	missense	Exon 4 of 6	NP_001092.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ACTB	ENST00000646664.1	MANE Select	c.527T>C	p.Leu176Pro	missense	Exon 4 of 6	ENSP00000494750.1
	ACTB	ENST00000425660.5	TSL:1	n.*190T>C		non_coding_transcript_exon	Exon 5 of 7	ENSP00000409264.1
	ACTB	ENST00000425660.5	TSL:1	n.*190T>C		3_prime_UTR	Exon 5 of 7	ENSP00000409264.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 70

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Baraitser-Winter syndrome 1 Pathogenic:1

Sep 11, 2017

MVZ Martinsried, Medicover Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.48	D
BayesDel_noAF	Pathogenic	0.46
CADD	Pathogenic	34
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.94	D
Eigen	Pathogenic	0.75
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.86	D
M_CAP	Pathogenic	0.91	D
MetaRNN	Pathogenic	0.88	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.0	H
PhyloP100		9.0
PrimateAI	Pathogenic	0.88	D
PROVEAN	Uncertain	-3.8	D
REVEL	Pathogenic	0.86
Sift4G	Benign	0.093	T
Polyphen		0.30	B
Vest4		0.94
MutPred		0.31		Loss of stability (P = 0.0027)
MVP		0.99
MPC		3.6
ClinPred		1.0	D
GERP RS		5.4
PromoterAI		-0.037	Neutral
Varity_R		0.99
gMVP		1.0
Mutation Taster		=2/98	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: rs1554329331; hg19: chr7-5568187;