chr8-6924925-A-C

Variant names:

• chr8-6924925-A-C
• rs757073410
• NM_001926.4:c.196T>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001926.4(DEFA6):​c.196T>G​(p.Ser66Ala) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. 1/1 splice prediction tools predict no significant impact on normal splicing. 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. S66T) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: DEFA6 NM_001926.4 missense, splice_region
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.648
• Publications: 0 publications found

Genes affected

DEFA6 (HGNC:2765): (defensin alpha 6) Defensins are a family of antimicrobial and cytotoxic peptides thought to be involved in host defense. They are abundant in the granules of neutrophils and also found in the epithelia of mucosal surfaces such as those of the intestine, respiratory tract, urinary tract, and vagina. Members of the defensin family are highly similar in protein sequence and distinguished by a conserved cysteine motif. Several alpha defensin genes appear to be clustered on chromosome 8. The protein encoded by this gene, defensin, alpha 6, is highly expressed in the secretory granules of Paneth cells of the small intestine, and likely plays a role in host defense of human bowel. [provided by RefSeq, Oct 2014]

ENSG00000295932 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.13393098).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001926.4. 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
	DEFA6	NM_001926.4	MANE Select	c.196T>G	p.Ser66Ala	missense splice_region	Exon 2 of 2	NP_001917.1	Q01524

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DEFA6	ENST00000297436.3	TSL:1 MANE Select	c.196T>G	p.Ser66Ala	missense splice_region	Exon 2 of 2	ENSP00000297436.2	Q01524
	ENSG00000295932	ENST00000734108.1		n.366+1134A>C		intron	N/A

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000274 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.35	T
BayesDel_noAF	Benign	-0.74
CADD	Benign	7.1
DANN	Benign	0.91
DEOGEN2	Benign	0.035	T
Eigen	Benign	-0.76
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.0011	N
M_CAP	Benign	0.0010	T
MetaRNN	Benign	0.13	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.0	M
PhyloP100		-0.65
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-2.0	N
REVEL	Benign	0.046
Sift	Benign	0.10	T
Sift4G	Uncertain	0.055	T
Polyphen		0.99	D
Vest4		0.098
MutPred		0.39		Loss of glycosylation at S66 (P = 0.0259)
MVP		0.20
MPC		0.00065
ClinPred		0.20	T
GERP RS		-3.7
Varity_R		0.062
gMVP		0.039
Mutation Taster		=99/1	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

dbSNP: rs757073410; hg19: chr8-6782447;