rs767026996

Variant names:

• chr9-105604227-C-T
• rs767026996
• NM_001079802.2:c.382C>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_001351499.2(FKTN):​c.-15C>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000211 in 1,612,354 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.000020 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000021 (1 hom.)
• Consequence: FKTN NM_001351499.2 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:7
• Conservation: PhyloP100: 2.35
• Publications: 3 publications found

Genes affected

FKTN (HGNC:3622): (fukutin) The protein encoded by this gene is a putative transmembrane protein that is localized to the cis-Golgi compartment, where it may be involved in the glycosylation of alpha-dystroglycan in skeletal muscle. The encoded protein is thought to be a glycosyltransferase and could play a role in brain development. Defects in this gene are a cause of Fukuyama-type congenital muscular dystrophy (FCMD), Walker-Warburg syndrome (WWS), limb-girdle muscular dystrophy type 2M (LGMD2M), and dilated cardiomyopathy type 1X (CMD1X). Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Nov 2010]

FKTN Gene-Disease associations (from GenCC):

• autosomal recessive limb-girdle muscular dystrophy type 2M

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae)
• muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A, 4

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, G2P, Labcorp Genetics (formerly Invitae)
• myopathy caused by variation in FKTN

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• congenital muscular dystrophy without intellectual disability

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• muscle-eye-brain disease

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• muscular dystrophy-dystroglycanopathy, type A

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• dilated cardiomyopathy 1X

  Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.2543642).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001351499.2. 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
	FKTN	NM_001079802.2	MANE Select	c.382C>T	p.Arg128Trp	missense	Exon 6 of 11	NP_001073270.1	O75072-1
	FKTN	NM_001351499.2		c.-15C>T		5_prime_UTR_premature_start_codon_gain	Exon 8 of 13	NP_001338428.1
	FKTN	NM_001351500.2		c.-15C>T		5_prime_UTR_premature_start_codon_gain	Exon 7 of 12	NP_001338429.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FKTN	ENST00000357998.10	TSL:5 MANE Select	c.382C>T	p.Arg128Trp	missense	Exon 6 of 11	ENSP00000350687.6	O75072-1
	FKTN	ENST00000223528.6	TSL:1	c.382C>T	p.Arg128Trp	missense	Exon 5 of 10	ENSP00000223528.2	O75072-1
	FKTN	ENST00000602526.1	TSL:1	n.*420C>T		non_coding_transcript_exon	Exon 6 of 11	ENSP00000473347.1	R4GMU0

Frequencies

GnomAD3 genomes AF: 0.0000197 AC: 3 AN: 152122 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000360 AC: 9 AN: 249668 AF XY: 0.0000370

Gnomad AFR exome AF: 0.0000615

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000357

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.0000212 AC: 31 AN: 1460114 Hom.: 1 Cov.: 32 AF XY: 0.0000330 AC XY: 24 AN XY: 726390

African (AFR) AF: 0.0000299 AC: 1 AN: 33428

American (AMR) AF: 0.0000224 AC: 1 AN: 44716

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

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

South Asian (SAS) AF: 0.000139 AC: 12 AN: 86184

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

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4354

European-Non Finnish (NFE) AF: 0.0000108 AC: 12 AN: 1111948

Other (OTH) AF: 0.0000830 AC: 5 AN: 60236

GnomAD4 genome AF: 0.0000197 AC: 3 AN: 152240 Hom.: 0 Cov.: 32 AF XY: 0.0000403 AC XY: 3 AN XY: 74424

African (AFR) AF: 0.00 AC: 0 AN: 41538

American (AMR) AF: 0.0000654 AC: 1 AN: 15302

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5180

South Asian (SAS) AF: 0.000207 AC: 1 AN: 4820

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10602

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68010

Other (OTH) AF: 0.00 AC: 0 AN: 2112

Alfa AF: 0.0000617 Hom.: 0

Bravo AF: 0.0000113

ExAC AF: 0.0000494 AC: 6

EpiCase AF: 0.0000545

EpiControl AF: 0.000119

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	3	-	not provided (3)
-	2	-	Cardiovascular phenotype (2)
-	2	-	Walker-Warburg congenital muscular dystrophy (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.067
BayesDel_addAF	Benign	-0.063	T
BayesDel_noAF	Benign	-0.15
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.31	T
Eigen	Benign	-0.26
Eigen_PC	Benign	-0.074
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Benign	0.84	T
M_CAP	Benign	0.033	D
MetaRNN	Benign	0.25	T
MetaSVM	Benign	-0.34	T
MutationAssessor	Benign	0.69	N
PhyloP100		2.3
PrimateAI	Benign	0.24	T
PROVEAN	Benign	-1.9	N
REVEL	Uncertain	0.38
Sift	Benign	0.053	T
Sift4G	Benign	0.079	T
Polyphen		0.0010	B
Vest4		0.42
MutPred		0.45		Loss of helix (P = 0.1299)
MVP		0.81
MPC		0.16
ClinPred		0.039	T
GERP RS		4.2
Varity_R		0.054
gMVP		0.62
Mutation Taster		=68/32	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs767026996; hg19: chr9-108366508;