rs867593888

chr22-36292059-T-Achr22-36292059-T-C

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM2 PM5 PP2 PP3_Strong PP5_Moderate

The NM_002473.6(MYH9):c.4271A>T(p.Asp1424Val) 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D1424E) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MYH9 NM_002473.6 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 8.01

Genes affected

MYH9 (HGNC:7579): (myosin heavy chain 9) This gene encodes a conventional non-muscle myosin; this protein should not be confused with the unconventional myosin-9a or 9b (MYO9A or MYO9B). The encoded protein is a myosin IIA heavy chain that contains an IQ domain and a myosin head-like domain which is involved in several important functions, including cytokinesis, cell motility and maintenance of cell shape. Defects in this gene have been associated with non-syndromic sensorineural deafness autosomal dominant type 17, Epstein syndrome, Alport syndrome with macrothrombocytopenia, Sebastian syndrome, Fechtner syndrome and macrothrombocytopenia with progressive sensorineural deafness. [provided by RefSeq, Dec 2011]

ACMG classification

Verdict is Pathogenic. Variant got 11 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr22-36292059-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 523453.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP2: Missense variant where missense usually causes diseases, MYH9
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.982
• PP5: Variant 22-36292059-T-A is Pathogenic according to our data. Variant chr22-36292059-T-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1338501.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYH9	NM_002473.6	c.4271A>T	p.Asp1424Val	missense_variant	31/41	ENST00000216181.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYH9	ENST00000216181.11	c.4271A>T	p.Asp1424Val	missense_variant	31/41	1	NM_002473.6	P1
MYH9	ENST00000685801.1	c.4334A>T	p.Asp1445Val	missense_variant	32/42
MYH9	ENST00000691109.1	n.4566A>T		non_coding_transcript_exon_variant	25/35

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Apr 11, 2019

DNA sequence analysis of the MYH9 gene demonstrated a sequence change, c.4271A>T, in exon 31 that results in an amino acid change, p.Asp1424Val. The c.4271A>T sequence change is absent from large population databases such as ExAC and gnomAD. The p.Asp1424Val change affects a highly conserved amino acid residue located in a domain of the MYH9 protein that is known to be functional. The p.Asp1424Val substitution appears to be deleterious using several in-silico pathogenicity prediction tools (SIFT, PolyPhen2, Align GVGD, REVEL). This particular amino acid change does not appear to have been described in the literature in other patients with MYH9 related disorders, however, multiple other pathogenic sequence changes affecting the same amino acid residue (p.Asp1424His, p.Asp1424Asn, p.Asp1424Tyr, p.Asp1424Glu, p.Asp1424Gly) have been described in patients and families with MYH9-related disorders (Seri et al., 2000; Kunishma et al., 2001; Saposnik et al., 2014). This sequence change is the likely cause of this phenotype, however functional studies have not been performed to prove this conclusively. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.87
BayesDel_addAF	Pathogenic	0.46	D
BayesDel_noAF	Pathogenic	0.43
Cadd	Pathogenic	29
Dann	Uncertain	0.99
DEOGEN2	Pathogenic	0.83	D
Eigen	Uncertain	0.54
Eigen_PC	Uncertain	0.50
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.93	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Uncertain	0.42	D
MutationAssessor	Pathogenic	4.1	H
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.63	T
PROVEAN	Pathogenic	-8.0	D
REVEL	Pathogenic	0.97
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.96
MutPred		0.81		Loss of disorder (P = 0.1132);
MVP		0.96
MPC		1.7
ClinPred		1.0	D
GERP RS		4.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.92
gMVP		0.72

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr22-36688105;