19-47476547-G-T

Variant names:

• chr19-47476547-G-T
• rs562237338
• NM_007059.4:c.1167C>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_007059.4(KPTN):​c.1167C>A​(p.Gly389Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,459,306 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. G389G) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 26)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: KPTN NM_007059.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.721
• Publications: 0 publications found

Genes affected

KPTN (HGNC:6404): (kaptin, actin binding protein) This gene encodes a filamentous-actin-associated protein, which is involved in actin dynamics and plays an important role in neuromorphogenesis. This protein is part of the KICSTOR protein complex that localizes to lysosomes. Mutations in this gene result in an autosomal recessive form of intellectual disability. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Jul 2017]

KPTN Gene-Disease associations (from GenCC):

• macrocephaly-developmental delay syndrome

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet

ENSG00000287896 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.52).
• BP7: Synonymous conserved (PhyloP=-0.721 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KPTN	NM_007059.4	c.1167C>A	p.Gly389Gly	synonymous_variant	Exon 11 of 12	ENST00000338134.8	NP_008990.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KPTN	ENST00000338134.8	c.1167C>A	p.Gly389Gly	synonymous_variant	Exon 11 of 12	1	NM_007059.4	ENSP00000337850.2

Frequencies

GnomAD3 genomes Cov.: 26

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1459306 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 725518

African (AFR) AF: 0.00 AC: 0 AN: 33428

American (AMR) AF: 0.00 AC: 0 AN: 44646

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26096

East Asian (EAS) AF: 0.00 AC: 0 AN: 39608

South Asian (SAS) AF: 0.00 AC: 0 AN: 86178

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53200

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5618

European-Non Finnish (NFE) AF: 9.01e-7 AC: 1 AN: 1110284

Other (OTH) AF: 0.00 AC: 0 AN: 60248

GnomAD4 genome Cov.: 26

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.52
CADD	Benign	12
DANN	Benign	0.82
PhyloP100		-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

Other links and lift over

dbSNP: rs562237338; hg19: chr19-47979804;