chr3-183650409-A-G

Variant names:

• chr3-183650409-A-G
• NM_017644.3:c.53A>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_017644.3(KLHL24):​c.53A>G​(p.Asp18Gly) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,860 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: KLHL24 NM_017644.3 missense
• Clinical Significance: Uncertain significance no assertion criteria provided U:1
• Conservation: PhyloP100: 7.00
• Publications: 0 publications found

Genes affected

KLHL24 (HGNC:25947): (kelch like family member 24) The protein encoded by this gene is a ubiquitin ligase substrate receptor and is regulated by autoubiquitination. Variations in the translation initiation codon of this gene have been found, which result in an N-terminally truncated but more stable protein due to loss of the autoubiquitination function. The more stable mutant protein causes an increased ubiquitin and degradation of keratin 14, which leads to skin fragility and the potentially life-threatening disease epidermolysis bullosa. The encoded protein is also involved in the regulation of kainate receptors. [provided by RefSeq, Mar 2017]

KLHL24 Gene-Disease associations (from GenCC):

• epidermolysis bullosa simplex 6, generalized, with scarring and hair loss

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp
• cardiomyopathy, familial hypertrophic, 29, with polyglucosan bodies

  Inheritance: AR Classification: STRONG, MODERATE, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• hypertrophic cardiomyopathy

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.31607753).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_017644.3. 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
	KLHL24	NM_017644.3	MANE Select	c.53A>G	p.Asp18Gly	missense	Exon 3 of 8	NP_060114.2	Q6TFL4-1
	KLHL24	NM_001349413.1		c.53A>G	p.Asp18Gly	missense	Exon 3 of 9	NP_001336342.1
	KLHL24	NM_001349414.1		c.53A>G	p.Asp18Gly	missense	Exon 3 of 9	NP_001336343.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KLHL24	ENST00000242810.11	TSL:1 MANE Select	c.53A>G	p.Asp18Gly	missense	Exon 3 of 8	ENSP00000242810.6	Q6TFL4-1
	KLHL24	ENST00000454652.6	TSL:1	c.53A>G	p.Asp18Gly	missense	Exon 4 of 9	ENSP00000395012.1	Q6TFL4-1
	KLHL24	ENST00000943871.1		c.53A>G	p.Asp18Gly	missense	Exon 3 of 10	ENSP00000613930.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461860 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727232

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111988

Other (OTH) AF: 0.00 AC: 0 AN: 60396

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
-	1	-	KLHL24-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Uncertain	0.15	D
BayesDel_noAF	Uncertain	-0.020
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.020	T
Eigen	Benign	-0.016
Eigen_PC	Benign	0.20
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	D
M_CAP	Benign	0.043	D
MetaRNN	Benign	0.32	T
MetaSVM	Benign	-0.47	T
MutationAssessor	Benign	0.81	L
PhyloP100		7.0
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	-1.0	N
REVEL	Uncertain	0.34
Sift	Uncertain	0.022	D
Sift4G	Benign	0.12	T
Polyphen		0.10	B
Vest4		0.29
MutPred		0.35		Gain of loop (P = 0.0166)
MVP		0.81
MPC		0.94
ClinPred		0.81	D
GERP RS		5.6
PromoterAI		-0.031	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.21
gMVP		0.67
Mutation Taster		=54/46	polymorphism

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

hg19: chr3-183368197;