17-35148412-C-A

Variant names:

• chr17-35148412-C-A
• rs750952595
• NM_001267052.2:c.149C>A

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001267052.2(UNC45B):​c.149C>A​(p.Ala50Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,566 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: UNC45B NM_001267052.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.75
• Publications: 0 publications found

Genes affected

UNC45B (HGNC:14304): (unc-45 myosin chaperone B) This gene encodes a co-chaperone required for folding and accumulation of type II myosins. The protein consists of three tetratricopeptide repeat motifs at the N-terminus that form a complex with heat shock protein 90, a central region of unknown function that is conserved in all Unc-45 proteins, and a C-terminal Unc-45/Cro1/She4 domain. The protein is expressed at high levels in striated muscle, where its muscle myosin chaperone activity is dependent on heat shock protein 90 acting as a co-chaperone. A missense mutation in this gene has been associated with cataract development. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Apr 2015]

UNC45B Gene-Disease associations (from GenCC):

• myofibrillar myopathy 11

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• cataract 43

  Inheritance: Unknown, AD Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), G2P
• early-onset nuclear cataract

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• early-onset posterior subcapsular cataract

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.902

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001267052.2. 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
	UNC45B	NM_001267052.2	MANE Select	c.149C>A	p.Ala50Glu	missense	Exon 2 of 20	NP_001253981.1	Q8IWX7-3
	UNC45B	NM_173167.3		c.149C>A	p.Ala50Glu	missense	Exon 1 of 19	NP_775259.1	Q8IWX7-1
	UNC45B	NM_001033576.2		c.149C>A	p.Ala50Glu	missense	Exon 2 of 20	NP_001028748.1	Q8IWX7-3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	UNC45B	ENST00000394570.7	TSL:1 MANE Select	c.149C>A	p.Ala50Glu	missense	Exon 2 of 20	ENSP00000378071.2	Q8IWX7-3
	UNC45B	ENST00000591048.2	TSL:1	c.149C>A	p.Ala50Glu	missense	Exon 1 of 17	ENSP00000468335.1	Q8IWX7-2
	UNC45B	ENST00000870786.1		c.149C>A	p.Ala50Glu	missense	Exon 2 of 21	ENSP00000540845.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000400 AC: 1 AN: 249914 AF XY: 0.00000739

Gnomad AFR exome AF: 0.0000620

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461566 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 727072

African (AFR) AF: 0.0000597 AC: 2 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44712

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26126

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86252

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53216

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5760

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111934

Other (OTH) AF: 0.0000331 AC: 2 AN: 60386

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000565 Hom.: 0

Bravo AF: 0.0000227

ExAC AF: 0.00000824 AC: 1

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	0.10
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.71	D
Eigen	Pathogenic	0.88
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.94	D
M_CAP	Benign	0.072	D
MetaRNN	Pathogenic	0.90	D
MetaSVM	Uncertain	0.77	D
MutationAssessor	Pathogenic	4.4	H
PhyloP100		7.7
PrimateAI	Uncertain	0.69	T
PROVEAN	Uncertain	-4.0	D
REVEL	Pathogenic	0.71
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0040	D
Polyphen		0.99	D
Vest4		0.74
MutPred		0.80		Loss of MoRF binding (P = 0.0488)
MVP		0.88
MPC		0.54
ClinPred		0.97	D
GERP RS		4.9
PromoterAI		0.041	Neutral
Varity_R		0.81
gMVP		0.84
Mutation Taster		=61/39	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs750952595; hg19: chr17-33475431;