19-19186964-C-T

Variant names:

• chr19-19186964-C-T
• rs2060415315
• NM_001145784.2:c.79G>A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001145784.2(BORCS8):​c.79G>A​(p.Glu27Lys) variant causes a missense change. The variant allele was found at a frequency of 0.00000286 in 1,399,074 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: 33)
  • Exomes 𝑓: 0.0000029 (0 hom.)
• Consequence: BORCS8 NM_001145784.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.92

Genes affected

BORCS8 (HGNC:37247): (BLOC-1 related complex subunit 8) Involved in heart development. Part of BORC complex. [provided by Alliance of Genome Resources, Apr 2022]

BORCS8-MEF2B (HGNC:39979): (BORCS8-MEF2B readthrough) This gene represents numerous read-through transcripts that span GeneID:729991 and 100271849. Many read-through transcripts are predicted to be nonsense-mediated decay (NMD) candidates, and are thought to be non-coding. Some transcripts are predicted to be capable of translation reinitiation at a downstream AUG, resulting in expression of at least one isoform of myocyte enhancer factor 2B (MEF2B) from this read-through locus. At least one additional MEF2B variant and isoform can be expressed from a downstream promoter, and is annotated on GeneID:100271849. [provided by RefSeq, Oct 2010]

MEF2B (HGNC:6995): (myocyte enhancer factor 2B) The product of this gene is a member of the MADS/MEF2 family of DNA binding proteins. The protein is thought to regulate gene expression, including expression of the smooth muscle myosin heavy chain gene. This region undergoes considerable alternative splicing, with transcripts supporting two non-overlapping loci (GeneID 729991 and 100271849) as well as numerous read-through transcripts that span both loci (annotated as GeneID 4207). Several isoforms of this protein are expressed from either this locus or from some of the read-through transcripts annotated on GeneID 4207. [provided by RefSeq, Jan 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.897

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BORCS8	NM_001145784.2	c.79G>A	p.Glu27Lys	missense_variant	Exon 2 of 6	ENST00000462790.8	NP_001139256.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BORCS8	ENST00000462790.8	c.79G>A	p.Glu27Lys	missense_variant	Exon 2 of 6	1	NM_001145784.2	ENSP00000425864.1
BORCS8-MEF2B	ENST00000514819.7	c.-89-4281G>A		intron_variant	Intron 1 of 8	5		ENSP00000454967.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000286 AC: 4 AN: 1399074 Hom.: 0 Cov.: 31 AF XY: 0.00000290 AC XY: 2 AN XY: 690046

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000371

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000473 Hom.: 0

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Apr 13, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.79G>A (p.E27K) alteration is located in exon 2 (coding exon 2) of the BORCS8 gene. This alteration results from a G to A substitution at nucleotide position 79, causing the glutamic acid (E) at amino acid position 27 to be replaced by a lysine (K). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.33
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.21	T;.
Eigen	Uncertain	0.28
Eigen_PC	Uncertain	0.35
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.91	D;D
M_CAP	Benign	0.031	D
MetaRNN	Pathogenic	0.90	D;D
MetaSVM	Benign	-0.62	T
PrimateAI	Pathogenic	0.89	D
PROVEAN	Uncertain	-3.5	D;D
REVEL	Uncertain	0.47
Sift	Uncertain	0.027	D;D
Sift4G	Uncertain	0.051	T;D
Polyphen		0.74	P;B
Vest4		0.95
MutPred		0.89		Gain of MoRF binding (P = 0.0048);Gain of MoRF binding (P = 0.0048);
MVP		0.16
ClinPred		0.93	D
GERP RS		4.7
Varity_R		0.14
gMVP		0.89

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

Publications

LitVar

Other links and lift over

dbSNP: rs2060415315; hg19: chr19-19297773;