NM_018203.3:c.899A>C

Variant names:

• chr1-205337553-T-G
• rs138757406
• NM_018203.3:c.899A>C

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_018203.3(KLHDC8A):​c.899A>C​(p.His300Pro) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,662 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H300R) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: KLHDC8A NM_018203.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.54
• Publications: 0 publications found

Genes affected

KLHDC8A (HGNC:25573): (kelch domain containing 8A) This gene encodes a kelch domain-containing protein which is upregulated in cancer. Upregulated expression of the encoded protein may provide an alternative pathway for tumors to maintain aggressiveness in the absence of epidermal growth factor receptor dependence. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2012]

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.811

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_018203.3. 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
	KLHDC8A	NM_018203.3	MANE Select	c.899A>C	p.His300Pro	missense	Exon 6 of 6	NP_060673.1	Q8IYD2
	KLHDC8A	NM_001271863.2		c.899A>C	p.His300Pro	missense	Exon 9 of 9	NP_001258792.1	Q8IYD2
	KLHDC8A	NM_001271864.2		c.899A>C	p.His300Pro	missense	Exon 7 of 7	NP_001258793.1	Q8IYD2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KLHDC8A	ENST00000367155.8	TSL:2 MANE Select	c.899A>C	p.His300Pro	missense	Exon 6 of 6	ENSP00000356123.3	Q8IYD2
	KLHDC8A	ENST00000941910.1		c.923A>C	p.His308Pro	missense	Exon 6 of 6	ENSP00000611969.1
	KLHDC8A	ENST00000367156.7	TSL:2	c.899A>C	p.His300Pro	missense	Exon 9 of 9	ENSP00000356124.3	Q8IYD2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461662 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727134

African (AFR) AF: 0.00 AC: 0 AN: 33474

American (AMR) AF: 0.00 AC: 0 AN: 44710

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26122

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

South Asian (SAS) AF: 0.00 AC: 0 AN: 86232

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53412

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5720

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111910

Other (OTH) AF: 0.00 AC: 0 AN: 60382

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.56
BayesDel_addAF	Pathogenic	0.32	D
BayesDel_noAF	Pathogenic	0.23
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Benign	0.32	T
Eigen	Pathogenic	0.74
Eigen_PC	Pathogenic	0.70
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.83	T
M_CAP	Benign	0.061	D
MetaRNN	Pathogenic	0.81	D
MetaSVM	Uncertain	0.28	D
MutationAssessor	Uncertain	2.5	M
PhyloP100		5.5
PrimateAI	Uncertain	0.54	T
PROVEAN	Benign	-1.8	N
REVEL	Pathogenic	0.80
Sift	Benign	0.13	T
Sift4G	Benign	0.10	T
Polyphen		1.0	D
Vest4		0.58
MutPred		0.63		Gain of catalytic residue at H300 (P = 0.0067)
MVP		0.93
MPC		1.1
ClinPred		0.95	D
GERP RS		5.3
Varity_R		0.53
gMVP		0.78
Mutation Taster		=48/52	disease causing

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: rs138757406; hg19: chr1-205306681;